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[[File:Solaranlage IMG 0533.jpg|thumb|300px|"Solar park" or "PV farm"]]
A '''photovoltaic system''' (informally, '''PV system''') is an arrangement of components designed to supply usable electric power for a variety of purposes, using the [[Sun]] (or, less commonly, other light sources) as the power source.
 
PV systems may be built in various configurations:
* [[Off-grid]] without battery (array-direct)
* Off-grid with battery storage for [[Direct current|DC]]-only appliances
* Off-grid with battery storage for [[Alternating Current|AC]] and DC appliances
* Grid-tie without battery
* Grid-tie with battery storage
 
A [[photovoltaic]] [[array]] (also called a solar array) consists of multiple [[photovoltaic module]]s, casually referred to as [[solar panel]]s, to convert [[solar radiation]] (sunlight) into usable [[direct current]] (DC) [[electricity]]. A photovoltaic system for residential, commercial, or industrial energy supply normally contains an array of photovoltaic (PV) modules, one or more DC to [[alternating current]] (AC) power converters (also known as [[Power inverter|inverters]]), a racking system that supports the solar modules, electrical wiring and interconnections, and mounting for other components. Optionally, a photovoltaic system may include any or all of the following: [[renewable energy credit]] revenue-grade meter, [[maximum power point tracker]] (MPPT), [[battery (electricity)|battery]] system and [[battery charger|charger]], [[GPS]] [[solar tracker]], [[energy management software]], [[solar concentrator]]s, [[solar irradiance]] sensors, [[anemometer]], or task-specific accessories designed to meet specialized requirements for a system owner.  The number of [[module]]s in the system determines the total DC watts capable of being generated by the solar array; however, the inverter ultimately governs the amount of AC watts that can be distributed for consumption. For example: A PV system comprising 11 [[kilowatt]]s DC (kWDC) worth of PV modules, paired with one 10-kilowatt AC (kWAC) inverter, will be limited by the maximum output of the inverter: 10&nbsp;kW AC.
 
A small PV system is capable of providing enough AC electricity to power a single home, or even an isolated device in the form of AC or DC electric. For example, military and civilian Earth observation [[satellite]]s, [[street lights]], construction and traffic signs, [[electric car]]s, solar-powered tents,<ref>[http://www.army.mil/article/49138/army-evaluating-transportable-solar-powered-tents/ Army evaluating transportable solar-powered tents | Article | The United States Army]. Army.mil (2010-12-08). Retrieved on 2013-07-17.</ref> and [[electric aircraft]] may contain integrated photovoltaic systems to provide a primary or [[auxiliary power]] source in the form of AC or DC power, depending on the design and power demands.
 
Large [[grid-connected photovoltaic power system]]s are capable of providing an energy supply for multiple consumers. The electricity generated can be stored, used directly (island/standalone plant), fed into a large electricity grid powered by central generation plants (grid-connected or grid-tied plant), or combined with one, or many, domestic electricity generators to feed into a small [[electrical grid]] (hybrid plant).<ref>[http://www.fsec.ucf.edu/en/consumer/solar_electricity/basics/types_of_pv.htm Types of PV systems]. Florida Solar Energy Center (FSEC), a research institute of the University of Central Florida.</ref><ref>Rahmani, R.; Fard, M.; Shojaei, A.A.; Othman, M.F.; Yusof, R., A complete model of stand-alone photovoltaic array in MATLAB-Simulink environment, 2011 IEEE Student Conference on Research and Development (SCOReD), pp 46–51, 2011.</ref> PV systems are generally designed in order to ensure the highest energy yield for a given investment.
 
In the [[United States]], the [[Authority Having Jurisdiction]] (AHJ) will review designs and issue permits, before construction can lawfully begin.  Electrical installation practices must comply with standards set forth within the [[National Electrical Code]] (NEC) and be inspected by the AHJ to ensure compliance with [[building code]], [[electrical code]], and [[fire safety]] code.  Jurisdictions may require that equipment has been tested, certified, listed, and labeled by at least one of the [[Nationally Recognized Testing Laboratories]] (NRTL). Despite the complicated installation process, a recent list of solar contractors shows a majority of installation companies were founded since 2000.<ref name="Solar Power World">[http://www.solarpowerworldonline.com/top-250-solar-contractors/ Solar Power World]</ref>
 
==Components==
 
===Silicon Boule & Solar Cell===
In order to make a [[Monocrystalline solar cell]], a [[silicon ingot]], also known as a silicon ''[[boule (crystal)]]'', must first be produced.  Once a silicon ingot has been made, it is thinly sliced and semiconductors are imbedded in the disk.<ref>[http://www.quora.com/Semiconductors/How-do-silicon-boules-not-break-off-during-semiconductor-fabrication Semiconductors: How do silicon boules not break off during semiconductor fabrication?]. Quora. Retrieved on 2013-07-17.</ref>  The silicon disk will have positive and negative leads, which serve as connection points to tie multiple cells in series.  Once multiple cells are connected in series, the formation of a module begins. Other types of solar cells are available. See [[List of types of solar cells]].
 
===Amorphous Silicon Cell===
Although this cell has the same elements as a monocrystalline solar cell, the main difference between each is the degradation period as well as price to produce the cell. Although technology is supposed to improve this technology, the monocrystalline cell is considered better, as there has been more advances and applications used for this type of cell.<ref>{{cite web|last=Sustainable Sources|title=Photovoltaic Systems|url=http://photovoltaics.sustainablesources.com/#CELLS|publisher=Sustainable Sources}}</ref>
 
===Photovoltaic modules===
[[File:Photovoltaic arrays at the Israeli National Solar Energy Center.jpg|thumb|A photovoltaic array is a linked assembly of [[photovoltaic module|PV modules]].]]
[[File:Pellworm Solarkraftanlage MS P4140080.JPG|thumb|Ground mounted system]]
[[File:SolarFachwerkhaus.jpg|thumb|right|PV array on an old house]]
Due to the low voltage of an individual [[solar cell]] (typically ca. 0.5V), several cells are wired (see: [[Copper in renewable energy#Solar photovoltaic power generation#Copper in photovoltaic power systems|Copper in photovoltaic power systems]]) in series in the manufacture of a "laminate". The laminate is assembled into a protective weatherproof enclosure, thus making a photovoltaic module or [[solar panel]]. Modules may then be strung together into a photovoltaic array.
 
===Photovoltaic arrays===
A ''photovoltaic array'' (or ''solar array'') is a linked collection of [[solar panel]]s.<ref name="RISE">{{cite web|url=http://www.rise.org.au/info/Applic/Array/index.html|title=Small Photovoltaic Arrays |work=Research Institute for Sustainable Energy (RISE), [[Murdoch University]]|accessdate=5 February 2010}}</ref>
The power that one module can produce is seldom enough to meet requirements of a home or a business, so the modules are linked together to form an ''array''. Most PV arrays use an [[solar inverter|inverter]] to convert the DC power produced by the modules into [[alternating current]] that can power [[light]]s, motors, and other loads. The modules in a PV array are usually first connected in [[Series circuits|series]] to obtain the desired [[voltage]]; the individual strings are then connected in [[Parallel circuits|parallel]] to allow the system to produce more [[Electric current|current]]. Solar panels are typically measured under STC (standard test conditions) or PTC (PVUSA test conditions), in [[watt]]s.<ref>[http://www.millenniumplanet.com/solar-buyers-guide.html Key Factors in selecting solar components]</ref> Typical panel ratings range from less than 100 watts to over 400 watts.<ref>[http://www.gosolarcalifornia.ca.gov/equipment/pv_modules.php List of Eligible SB1 Guidelines Compliant Photovoltaic Modules]</ref> The array rating consists of a summation of the panel ratings, in watts, kilowatts, or megawatts.<!--note: A 10 watt array, consisting of one 10 watt panel can accurately be described as a 10 watt array, a 0.01 kilowatt array, or a 0.00001 megawatt array. All three are correct. Likewise a 50 megawatt array could be described as a 50,000 kilowatt array, etc.-->
 
===Mounting systems===
{{Main|Photovoltaic mounting system}}
Modules are assembled into arrays on some kind of mounting system, which may be classified as ground mount, roof mount or pole mount. For [[solar park]]s a large rack is mounted on the ground, and the modules mounted on the rack.
For buildings, many different racks have been devised for pitched roofs. For flat roofs, racks, bins and building integrated solutions are used.{{Citation needed|date=January 2012}}
Solar panel racks mounted on top of poles can be stationary or moving, see Trackers below. Side-of-pole mounts are suitable for situations where a pole has something else mounted at its top, such as a light fixture or an antenna. Pole mounting raises what would otherwise be a ground mounted array above weed shadows and livestock, and may satisfy electrical code requirements regarding inaccessibility of exposed wiring. Pole mounted panels are open to more cooling air on their underside, which increases performance. A multiplicity of pole top racks can be formed into a parking carport or other shade structure. A rack which does not follow the sun from left to right may allow seasonal adjustment up or down.
 
===Trackers===
A [[solar tracker]] tilts a solar panel throughout the day. Depending on the type of tracking system, the panel is either aimed directly at the sun or the brightest area of a partly clouded sky. Trackers greatly enhance early morning and late afternoon performance, increasing the total amount of power produced by a system by about 20–25% for a single axis tracker and about 30% or more for a dual axis tracker, depending on latitude.<ref>[http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/ A Performance Calculator]. Rredc.nrel.gov. Retrieved on 2012-04-23.</ref><ref>[http://www.mecasolar.com/_bin/ventajas_2_ejes.php Technological advantages]. Mecasolar.com. Retrieved on 2012-04-23.</ref>
Trackers are effective in regions that receive a large portion of sunlight directly. In diffuse light (i.e. under cloud or fog), tracking has little or no value. Because most [[concentrated photovoltaics]] systems are very sensitive to the sunlight's angle, tracking systems allow them to produce useful power for more than a brief period each day.<ref>o
Al-Mohamad, Ali. "Efficiency improvements of photo-voltaic panels using a Sun-tracking system." Applied Energy 79, no. 3 (2004): 345-354.</ref>
Tracking systems improve performance for two main reasons. First, when a solar panel is perpendicular to the sunlight, it receives more light on its surface than if it were angled. Second, direct light is used more efficiently than angled light{{Citation needed|date=January 2012}}. Special [[Anti-reflective|Anti-reflective coatings]] can improve solar panel efficiency for direct and angled light, somewhat reducing the benefit of tracking.<ref>[http://www.scientificblogging.com/news_releases/reflective_coating_silicon_solar_cells_boosts_absorption_over_96_percent Reflective Coating Silicon Solar Cells Boosts Absorption Over 96 Percent]. Scientificblogging.com (2008-11-03). Retrieved on 2012-04-23.</ref>
 
===Inverters===
[[File:Onduleur pour photovoltaïque.jpg|thumb|Inverter for grid connected PV]]
{{main|Solar inverter|Solar micro-inverter}}
Systems designed to deliver [[alternating current]] (AC), such as [[Photovoltaic system#Grid-connected applications|grid-connected applications]] need an inverter to convert the [[direct current]] (DC) from the solar modules to AC. Grid connected inverters must supply AC electricity in sinusoidal form, synchronized to the grid frequency, limit feed in voltage to no higher than the grid voltage and disconnect from the grid if the grid voltage is turned off.<ref>[http://homepower.com/article/?file=HP130_pg28_ATE_2 Grid-Tied Inverter Safety]. Homepower.com. Retrieved on 2012-04-23.</ref> Islanding inverters need only produce regulated voltages and frequencies in a sinusoidal waveshape as no synchronisation or co-ordination with grid supplies is required.
A [[solar inverter]] may connect to a string of solar panels. In some installations a [[solar micro-inverter]] is connected at each solar panel.<ref>[http://www.smartplanet.com/blog/intelligent-energy/trend-watch-microinverters-invade-solar/9707 Trend watch: Microinverters invade solar]</ref>
For safety reasons a circuit breaker is provided both on the AC and DC side to enable maintenance. AC output may be connected through an [[electricity meter]] into the public grid.<ref>[http://www.schurter.com/content/download/244246/7047074/version/3/file/Solar_Technology_wp_us.pdf Services and Solutions for Photovoltaic Systems]</ref>
 
===Maximum power point tracking and charge control===
[[Maximum power point tracking]] (MPPT) is used to maximize module output power. The power output of a module varies as a function of the voltage in a way that power generation can be optimized by varying the system voltage to find the 'maximum power point'. Some inverters incorporate [[maximum power point tracking]].<ref>[http://www.industry.usa.siemens.com/topics/us/en/solarexchange/2009/Documents/Kerns_Solar_Exchange_Tempe.pdf Inverter Technology for the Solar Industry]</ref>
 
In the case of PV systems which include a battery, a charge controller<ref>[http://www.homepower.com/articles/solar-electricity/equipment-products/2012-charge-controller-buyers-guide]</ref> is needed to adjust the constantly varying voltage and current available from PV panels, to correctly charge the battery. Basic charge controllers may simply turn the PV panels on and off, or may meter out pulses of energy as needed, a strategy called PWM or [[pulse-width modulation]]. More advanced charge controllers will incorporate MPPT logic into their battery charging algorithms. Charge controllers may also divert energy to some purpose other than battery charging. Rather than simply shut off the free PV energy when not needed, a user may choose to heat air or water once the battery is full.
 
A charge controller with MPPT capability frees the system designer from closely matching available PV voltage to battery voltage. Considerable efficiency gains can be achieved, particularly when the PV array is located at some distance from the battery. By way of example, a 150 volt PV array connected to an MPPT charge controller can be used to charge a 24 or 48 volt battery. Higher array voltage means lower array current, so the savings in wiring costs can more than pay for the controller.
 
===Monitoring and metering===
The metering must be able to accumulate energy units in both directions or two meters must be used. Many meters accumulate bidirectionally, some systems use two meters, but a unidirectional meter (with detent) will not accumulate energy from any resultant feed into the grid.<ref>[http://www.solarelectricpower.org/media/84144/sepa%20pv%20metering.pdf Residential Photovoltaic Metering and Interconnection Study]</ref>
 
In some countries, for installations over 30kWp a frequency and a voltage monitor with disconnection of all phases is required. This is done to prevent supplying excess power to the grid, in the unusual case where more solar power is being generated than can be accommodated by the utility, and can not either be exported or [[Grid energy storage|stored]]. Grid operators historically have needed to provide transmission lines and generation capacity. Now they need to also provide storage. This is normally hydro-storage, but other means of storage are used. Initially storage was used so that baseload generators could operate at full output. With [[variable renewable energy]], storage is needed to allow power generation whenever it is available, and consumption whenever it is needed. The two variables a grid operator have are storing electricity for ''when'' it is needed, or transmitting it to ''where'' it is needed. If both of those fail, installations over 30kWp can automatically shut down, although in practice all inverters maintain voltage regulation and stop supplying power if the load is inadequate. Grid operators have the option of curtailing excess generation from large systems, although this is more commonly done with wind power than solar power, and results in a substantial loss of revenue.<ref>[http://www.nrel.gov/docs/fy12osti/53732.pdf Integrating Variable Renewable Energy in Electric Power Markets]</ref> Inverters have the unique option of supplying reactive power which can be advantageous in matching load requirements.<ref>[http://www.renewableenergyworld.com/rea/news/article/2012/01/smart-pv-inverter-benefits-for-utilities Smart PV Inverter Benefits for Utilities]</ref>
 
==Standalone applications==
{{Main|Stand-alone photovoltaic power system}}
[[File:TicketParkingMeter.jpg|thumb|Solar powered parking meter.]]
[[File:Solar panels on yacht at sea.jpg|thumb|right|The solar panels on this small yacht at sea can charge the 12 volt batteries at up to 9 amperes in full, direct sunlight.]]
A standalone system does not have a connection to the electricity "mains" (aka "grid"). Standalone systems vary widely in size and application from wristwatches or calculators to remote buildings or spacecraft. If the load is to be supplied independently of solar [[insolation]], the generated power is stored and buffered with a battery. In non-portable applications where weight is not an issue, such as in buildings, [[lead acid battery|lead acid batteries]] are most commonly used for their low cost and tolerance for abuse. A charge controller may be incorporated in the system to:
a) avoid battery damage by excessive charging or discharging and,
b) optimizing the production of the cells or modules by [[maximum power point tracking]] (MPPT). However, in simple PV systems where the PV module voltage is matched to the battery voltage, the use of MPPT electronics is generally considered unnecessary, since the battery voltage is stable enough to provide near-maximum power collection from the PV module.
In small devices (e.g. calculators, parking meters) only [[direct current]] (DC) is consumed. In larger systems (e.g. buildings, remote water pumps) AC is usually required. To convert the DC from the modules or batteries into AC, an [[Inverter (electrical)|inverter]] is used.
 
===Pumps===
Solar well pumps are common and widespread.<ref>{{cite web|title=Pumping Water with Sunshine|url=http://www.homepower.com/articles/solar-electricity/equipment-products/pumping-water-sunshine|accessdate=7 January 2014}}</ref><ref>{{cite web|title=Solar Well Pumps|url=https://www.sunrotor.com/|accessdate=7 January 2014}}</ref> They often meet a need for water beyond the reach of power lines, taking the place of a [[windmill]] or [[windpump]]. One common application is the filling of livestock watering tanks, so that grazing cattle may drink. Another is the refilling of drinking water storage tanks on remote or self-sufficient homes.
 
===Fans===
Connecting a photovoltaic panel directly to a DC [[mechanical fan]] motor can provide air movement when it is most needed during the day. Common applications include both [[attic]] and [[greenhouse]] ventilation. Increased efficiency can be obtained by interposing a linear current booster (LCB) between the solar panel and the fan motor, to more closely coordinate varying panel output with motor energy requirements. Other controls sometimes used are timers and thermostats, so that the fan does not run when not wanted, even if the sun is shining.
 
===Solar vehicles===
{{main|Solar vehicle}}
Ground, water, air or space vehicles may obtain some or all of the energy required for their operation from the sun. Surface vehicles generally require higher power levels than can be sustained by a practically sized solar array, so a battery is used to meet peak power demand, and the solar array recharges it. Space vehicles have successfully used solar photovoltaic systems for years of operation, eliminating the weight of fuel or primary batteries.
 
===Small scale solar systems===
[[File:Coyle Industries Portable Solar Power System.jpg|thumb|Profile picture of a mobile solar powered generator]]
With a growing [[Do it yourself|DIY]]-community and an increasing interest in environmentally friendly "[[green energy]]", some hobbyists have endeavored to build their own PV solar systems from kits<ref>[http://www.greenplanet4energy.com People building their own solar systems from kits]. Greenplanet4energy.com. Retrieved on 2012-04-23.</ref> or partly diy.<ref>[http://www.instructables.com/id/Solar-Power-System/ Example of diy PV system with pictures]. Instructables.com (2007-11-05). Retrieved on 2012-04-23.</ref> Usually, the DIY-community uses inexpensive<ref>Graham, Michael. (2005-10-15) [http://www.treehugger.com/files/2005/10/inexpensive_diy.php Low-cost PV solar kit preferred by diy-communities]. Treehugger.com. Retrieved on 2012-04-23.</ref> or high efficiency systems<ref>Ken Darrow and Mike Saxenian {{Wayback |date=20100922115732 |url=http://www.villageearth.org/pages/Appropriate_Technology/ATSourcebook/ |title=Appropriate Technology Sourcebook }}. villageearth.org</ref> (such as those with [[solar tracking]]) to generate their own power. As a result, the DIY-systems often end up cheaper than their commercial counterparts.<ref>{{cite web | url=http://www.michigan.gov/documents/gov/Alternative_Energy_223194_7.pdf | title=Alternative Energy Development: Michigan will be Nation’s Leader in Alternative Energy Technology, Jobs | publisher=State of Michigan, Office Of The Governor | accessdate=February 22, 2012}}</ref> Often, the system is also hooked up into the regular [[power grid]], using [[net metering]] instead of a battery for backup. These systems usually generate power amount of ~2&nbsp;kW or less. Through the internet, the community is now able to obtain plans to construct the system (at least partly DIY) and there is a growing trend toward building them for domestic requirements. Small scale solar systems are now also being used both in developed countries and in [[developing countries]], for residences and small businesses.<ref>[http://villageearth.org/appropriate-technology/appropriate-technology-sourcebook/energy Energy]</ref><ref>[https://www.atmosfair.de/en/projekte1/projekte00/india-solar-lamps-for-rural-areas/ Solar Lamps]</ref> One of the most cost effective solar applications is a solar powered pump, as it is far cheaper to purchase a solar panel than it is to run power lines.<ref>[http://daily.bhaskar.com/article/RAJ-JPR-pay-bill-for-4-months-get-power-for-25-years-3491363.html 'Pay bill for 4 months, get power for 25 years']</ref>
 
==Grid-connected applications==
{{Main|Grid-connected photovoltaic power system}}
[[File:PV-system urban home1.png|400px|thumb|right|Diagram of a residential grid-connected PV system]]
A grid connected system is connected to a larger independent grid (typically the public electricity grid) and feeds energy directly into the grid. This energy may be shared by a residential or commercial building before or after the revenue measurement point. The difference being whether the credited energy production is calculated independently of the customer's energy consumption ([[feed-in tariff]]) or only on the difference of energy ([[net metering]]). Grid connected systems vary in size from residential (2-10kWp) to solar power stations (up to 10s of MWp). This is a form of decentralized electricity generation. The feeding of electricity into the grid requires the transformation of DC into AC by a special, synchronising [[grid-tie inverter]].<ref>[http://www.solarcity.com/residential/how-solar-works.aspx How Solar Power Works]</ref>
In kW sized installations the DC side system voltage is as high as permitted (typically 1000V except US residential 600V) to limit ohmic losses. Most modules (72 crystalline silicon cells) generate 160W to 300W at 36 volts. It is sometimes necessary or desirable to connect the modules partially in parallel rather than all in series. One set of modules connected in series is known as a 'string'.<ref>[http://homepower.com/view/?file=HP113_pg106_WordPower Photovoltaic... Cell, Module, String, Array]</ref>
 
===Connection to DC grids===
 
DC grids are found in electric powered transport: railways trams and trolleybuses. A few pilot plants for such applications have been built, such as the tram depots in Hannover Leinhausen, using photovoltaic contributors<ref>{{Wayback |date=20090318231142 |url=http://www.iea-pvps.org/products/download/rep7_07.pdf |title=Innovative Electrical Concepts }}. International Energy Agency (2001)</ref> and Geneva (Bachet de Pesay).<ref>[http://www.ecotourisme.ch/site/7/site7.htm site7]. Ecotourisme.ch. Retrieved on 2012-04-23.</ref> The 150&nbsp;kW<sub>p</sub> Geneva site feeds 600V DC directly into the tram/trolleybus electricity network whereas before it provided about 15% of the electricity at its opening in 1999.
 
===Building-mounted and building-integrated systems===
In urban and suburban areas, photovoltaic arrays are commonly used on rooftops to supplement power use; often the building will have a connection to the [[power grid]], in which case the energy produced by the PV array can be sold back to the [[utility]] in some sort of [[net metering]] agreement. Some utilities, such as Solvay Electric in Solvay, NY, use the rooftops of commercial customers and telephone poles to support their use of PV panels.<ref name="Solvay Electric Using Solar Panels on Telephone Poles">[http://www.9wsyr.com/news/local/story/Solvay-Electric-using-solar-panels-on-utility/4fFgF35JP0yyCmRElazAQg.cspx]</ref> [[Solar tree]]s are arrays that, as the name implies, mimic the look of trees, provide shade, and at night can function as [[street light]]s. In [[agriculture|agricultural]] settings, the array may be used to directly power DC [[pump]]s, without the need for an [[inverter (electrical)|inverter]]. In remote settings such as mountainous areas, islands, or other places where a power grid is unavailable, solar arrays can be used as the sole source of electricity, usually by charging a [[storage battery]].{{Citation needed|date=January 2012}}
There is financial support available for people wishing to install PV arrays. Incentives range from federal tax credits to state tax credits and rebates to utility loans and rebates. A listing of current incentives can be found at the [http://www.dsireusa.org Database of State Incentives for Renewables and Efficiency].
In the UK, households are paid a 'Feedback Fee' to buy excess electricity at a flat rate per kWh. This is up to 44.3p/kWh which can allow a home to earn double their usual annual domestic electricity bill.<ref name="Feed In Tariff UK">[http://www.microgeneration.com/grants-and-funding/feed-in-tariff Feed in Tariffs]. Microgeneration.com. Retrieved on 2012-04-23.</ref> The current UK [[feed-in tariff]] system is due for review on 31 March 2012, after which the current scheme may no longer be available.<ref name="Solar Photovoltaic FAQs">[http://www.swithenbanks.co.uk/site.php?action=full&id=357 FAQs on Solar Photovoltaic Panels at Swithenbanks, Solar Panels, Solar Hot Water, Water Turbines, Wind Turbines]. Swithenbanks.co.uk. Retrieved on 2012-04-23.</ref>{{qn|date=June 2012}}
 
===Ground-, building- and roof-mounted PV solar systems planning and permit===
In urban and suburban areas, providing plans and structural calculations may be required by your local governing jurisdiction. Check with your local City/County. http://solarstructuralcalcs.com offer ground mount solar pv plans, roof mount solar pv plans, and structural calculations analysis for residential and commercial projects nationwide.
 
===Power plants===
{{main|Photovoltaic power station}}
[[File:Juwi PV Field.jpg|thumb|400px|[[Waldpolenz Solar Park]], [[Germany]]]]
A ''photovoltaic power station'' (solar park or solar farm) is a [[power station]] using photovoltaic modules and [[inverter (electrical)|inverters]] for utility scale [[electricity generation]], connected to an electricity transmission grid. Some large photovoltaic power stations like [[Waldpolenz Solar Park]] and [[Topaz Solar Farm]] cover tens or hundreds of hectares and have power outputs up to hundreds of [[megawatt]]s.
 
==System performance==
 
===Insolation and energy===
[[Solar insolation]] is made up of [[direct radiation]], [[diffuse radiation]] and reflected radiation (or [[albedo]]).The absorption factor of a PV cell is defined as the fraction of incident solar irradiance that is absorbed by the cell.<ref>{{cite journal|last=Santbergen|first=R|coauthors=R.J.C. van Zolingen|title=The absorption factor of crystalline silicon PV cells: A numerical and experimental study|journal=Solar Energy Materials & Solar Cells|date=22 October 2007}}</ref> At high noon on a cloudless day at the equator, the power of the sun is about 1 [[kilowatt|kW]]/m²,<ref>{{cite book|last=El-Sharkawi|first=Mohamed A.|title=Electric energy|year=2005|publisher=CRC Press|isbn=978-0-8493-3078-0|pages=87–88}}</ref> on the Earth's surface, to a plane that is perpendicular to the sun's rays. As such, PV arrays can [[solar tracker|track the sun]] through each day to greatly enhance energy collection. However, tracking devices add cost, and require maintenance, so it is more common for PV arrays to have fixed mounts that tilt the array and face [[solar noon]] (approximately due south in the Northern Hemisphere or due north in the Southern Hemisphere). The tilt angle, from horizontal, can be varied for season,<ref>[http://www.macslab.com/optsolar.html Optimum Tilt of Solar Panels]</ref> but if fixed, should be set to give optimal array output during the peak electrical demand portion of a typical year for a  stand alone system. This optimal module tilt angle is not necessarily identical to the tilt angle for maximum annual array energy output.<ref>[http://www.fsec.ucf.edu/en/publications/pdf/FSEC-RR-54-98-2.pdf Stand Alone Photovoltaic Lighting Systems]</ref> The optimization of the a photovoltaic system for a specific environment can be complicated as issues of solar flux, soiling, and snow losses should be taken into effect. In addition, recent work has shown that spectral effects can play a role in optimal photovoltaic material selection. For example, the [[spectral albedo]] can play a significant role in output depending on the surface around the photovoltaic system.<ref>Rob W. Andrews and Joshua M. Pearce, [http://dx.doi.org/10.1016/j.solener.2013.01.030 The effect of spectral albedo on amorphous silicon and crystalline silicon solar photovoltaic device performance], ''Solar Energy'', '''91''',233–241 (2013). DOI:10.1016/j.solener.2013.01.030 [http://www.academia.edu/3081684/The_effect_of_spectral_albedo_on_amorphous_silicon_and_crystalline_silicon_solar_photovoltaic_device_performance open access]</ref>
 
For the weather and latitudes of the United States and Europe, typical insolation ranges from 4 kWh/m²/day in northern climes to 6.5 kWh/m²/day in the sunniest regions. Typical solar panels have an average efficiency of 15%, with the best commercially available panels at 21%. Thus, a photovoltaic installation in the southern latitudes of Europe or the United States may expect to produce 1 kWh/m²/day. A typical "150 watt" solar panel is about a square meter in size. Such a panel may be expected to produce 0.75 kWh every day, on average, after taking into account the weather and the latitude, for an insolation of 5 sun hours/day. A typical 1&nbsp;kW photovoltaic installation in Australia or the southern latitudes of Europe or United States, may produce 3.5-5 kWh per day, dependent on location, orientation, tilt, insolation and other factors.<ref>{{cite web|url=http://www.solarchoice.net.au/blog/how-much-energy-will-my-solar-cells-produce/ |title=How much energy will my solar cells produce? |accessdate=2012-05-30 }}</ref>
In the [[Sahara]] desert, with less cloud cover and a better solar angle, one could ideally obtain closer to 8.3 kWh/m²/day provided the nearly ever present wind would not blow sand onto the units. The area of the Sahara desert is over 9 million km². 90,600&nbsp;km², or about 1%, could generate as much electricity as all of the world's power plants combined.<ref>[http://social.csptoday.com/taxonomy/term/83/saharas-solar-power-potential-underlined Sahara's solar power potential underlined]</ref>
 
===Tracking the sun===
Trackers and sensors to optimise the performance are often seen as optional, but tracking systems can increase viable output by up to 45%.<ref name="RISE"/><ref>[http://www.solartown.com/learning/solar-panels/beginners-guide-to-solar-trackers-how-to-increase-output-for-your-home-solar-panel-system/ Beginners' Guide to Solar Trackers: How to Increase Output for Your Home Solar Panel System]</ref> PV arrays that approach or exceed one megawatt often use solar trackers. Accounting for clouds, and the fact that most of the world is not on the equator, and that the sun sets in the evening, the correct measure of solar power is [[insolation]] – the average number of kilowatt-hours per square meter per day. For the weather and latitudes of the United States and Europe, typical insolation ranges from 2.26&nbsp;kWh/m²/day in northern climes to 5.61&nbsp;kWh/m²/day in the sunniest regions.<ref>[http://www.apricus.com/html/insolation_levels_europe.htm Insolation Levels (Europe)]</ref><ref>[http://www.porta-energy.com/Insolation_USA.htm 10 years Average Insolation Data]</ref>
 
For large systems, the energy gained by using tracking systems can outweigh the added complexity (trackers can increase efficiency by 30% or more). For [[Very large scale solar power plant|very large systems]], the added maintenance of tracking is a substantial detriment.<ref>[http://www1.ifc.org/wps/wcm/connect/04b38b804a178f13b377ffdd29332b51/SOLAR%2BGUIDE%2BBOOK.pdf?MOD=AJPERES Utility Scale Solar Power Plants]</ref> Tracking is not required for flat panel and low-concentration [[Concentrated photovoltaics|photovoltaic system]]s. For high-concentration photovoltaic systems, dual axis tracking is a necessity.<ref>[http://www.helmholz.us/smallpowersystems/Intro.pdf Should You Install a Solar Tracker?]</ref>
 
Pricing trends affect the balance between adding more stationary solar panels versus having fewer panels that track. When solar panel prices drop, trackers become a less attractive option.
 
===Shading and dirt===
Photovoltaic cell electrical output is extremely sensitive to shading. The effects of this shading are well known.<ref>Kajihara, Atsushi, and A. T. Harakawa. "Model of photovoltaic cell circuits under partial shading." ''Industrial Technology, 2005. ICIT 2005. IEEE International Conference on. IEEE'', 2005.</ref><ref>Drif, M., Perez, P. J., Aguilera, J., & Aguilar, J. D. (2008). A new estimation method of irradiance on a partially shaded PV generator in grid-connected photovoltaic systems. ''Renewable Energy'', '''33'''(9), 2048-2056.</ref><ref>VENTRE, JERRY AUTOR. ''Photovoltaic systems engineering''. CRC press, 2004.</ref> When even a small portion of a cell, module, or array is shaded, while the remainder is in sunlight, the output falls dramatically due to internal 'short-circuiting' (the electrons reversing course through the shaded portion of the [[p-n junction]]).
If the current drawn from the series string of cells is no greater than the current that can be produced by the shaded cell, the current (and so power) developed by the string is limited. If enough voltage is available from the rest of the cells in a string, current will be forced through the cell by breaking down the junction in the shaded portion. This breakdown voltage in common cells is between 10 and 30 volts. Instead of adding to the power produced by the panel, the shaded cell absorbs power, turning it into heat. Since the reverse voltage of a shaded cell is much greater than the forward voltage of an illuminated cell, one shaded cell can absorb the power of many other cells in the string, disproportionately affecting panel output. For example, a shaded cell may drop 8 volts, instead of adding 0.5 volts, at a particular current level, thereby absorbing the power produced by 16 other cells.<ref name=UE03>Ursula Eicker, ''Solar Technologies for Buildings'', Wiley 2003, ISBN 0-471-48637-X, page 226</ref> It is, thus important that a PV installation is not shaded by trees or other obstructions. Several methods have been developed to determine shading losses from trees to PV systems over both large regions using [[LiDAR]],<ref>H. T. Nguyen and J. M. Pearce, Incorporating Shading Losses in Solar Photovoltaic Potential Assessment at the Municipal Scale, ''Solar Energy'' '''86'''(5), pp. 1245–1260 (2012). Source: http://www.academia.edu/1499891/Incorporating_Shading_Losses_in_Solar_Photovoltaic_Potential_Assessment_at_the_Municipal_Scale</ref> but also at an individual system level using [[sketchup]].<ref>Z. Dereli, C. Yücedağ and J. M. Pearce, Simple and Low-Cost Method of Planning for Tree Growth and Lifetime Effects on Solar Photovoltaic Systems Performance, ''Solar Energy'', 95, pp.300-307 (2013). Available: http://www.academia.edu/4074627/Simple_and_low-cost_method_of_planning_for_tree_growth_and_lifetime_effects_on_solar_photovoltaic_systems_performance</ref>
Most modules have bypass diodes between each cell or string of cells that minimize the effects of shading and only lose the power of the shaded portion of the array. The main job of the bypass diode is to eliminate hot spots that form on cells that can cause further damage to the array, and cause fires.
Sunlight can be absorbed by dust, snow, or other impurities at the surface of the module. This can reduce the light that strikes the cells. In general these losses aggregated over the year are small even for locations in Canada.<ref name="open access">Rob Andrews and Joshua M. Pearce, “[http://www.ieee-pvsc.org/ePVSC/manuscripts/MePVSC566_0521131900.pdf Prediction of Energy Effects on Photovoltaic Systems due to Snowfall Events]” in: ''2012 38th IEEE Photovoltaic Specialists Conference (PVSC)''. Presented at the 2012 38th IEEE Photovoltaic Specialists Conference (PVSC), pp. 003386 –003391. Available: [http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6318297 DOI] [http://mtu.academia.edu/JoshuaPearce/Papers/1990041/Prediction_of_Energy_Effects_on_Photovoltaic_Systems_due_to_Snowfall_Events open access]</ref> Maintaining a clean module surface will increase output performance over the life of the module. Google found that cleaning the flat mounted solar panels after 15 months increased their output by almost 100%, but that the 5% tilted arrays were adequately cleaned by rainwater.<ref>[http://googleblog.blogspot.com/2009/07/should-you-spring-clean-your-solar.html Should you spring clean your solar panels?]</ref><ref name="snow2">Rob W. Andrews, Andrew Pollard, Joshua M. Pearce, “The Effects of Snowfall on Solar Photovoltaic Performance ”, ''Solar Energy'' '''92''', 8497 (2013). DOI: http://dx.doi.org/10.1016/j.solener.2013.02.014 [http://www.academia.edu/3193083/The_Effects_of_Snowfall_on_Solar_Photovoltaic_Performance open access]</ref>
 
===Temperature===
Module output and life are also degraded by increased temperature. Allowing ambient air to flow over, and if possible behind, PV modules reduces this problem.
 
===Module efficiency===
In 2012, solar panels available for consumers can have an efficiency of up to about 17%,<ref>{{cite web|url=http://sroeco.com/solar/most-efficient-solar-panels|title=Solar Panel Comparison Table |accessdate=2012-10-21}}</ref> while commercially available panels can go as far as 27%. It has been recorded that a group from the The Fraunhofer Institute for Solar Energy Systems have created a cell that can reach 44.7% efficiency, which will make scientists hopes to reach the 50% efficiency threshold a lot more feasible.<ref>{{cite journal|last=Andresen|first=Bjarne|coauthors=R. Stephen Berry|title=Thermodynamics in finite time. I. The step-Carnot cycle|journal=Physical Review A|date=May 1977|url=http://pra.aps.org/abstract/PRA/v15/i5/p2086_1}}</ref><ref>{{cite web|last=Fraunhofer Institute for Solar Energy Systems|title=World Record Solar Cell with 44.7% Efficiency|url=http://www.ise.fraunhofer.de/en/press-and-media/press-releases/presseinformationen-2013/world-record-solar-cell-with-44.7-efficiency|publisher=Fraunhofer ISE}}</ref><ref>{{cite web|url=http://www.concentrix-solar.de/technology/concentrator-modules/?L=1 |title=Concentrix Solar: Concentrator Modules |accessdate=2008-12-03 }}</ref><ref>[http://www.renewableenergyfocususa.com/view/16037/cpv-solar-cell-reach-27-system-efficiency/ CPV Solar Cell Reach 27% System Efficiency]</ref>
 
===Monitoring===
Photovoltaic systems need to be monitored to detect breakdown and optimize their operation. Several ''photovoltaic monitoring'' strategies depending on the output of the installation and its nature. Monitoring can be performed on site or remotely. It can measure production only, retrieve all the data from the inverter or retrieve all of the data from the communicating equipment (probes, meters, etc.). Monitoring tools can be dedicated to supervision only or offer additional functions. Individual inverters and battery charge controllers may include monitoring using manufacturer specific protocols and software.<ref>[http://enphase.com/explore/enphase-technology/ Enphase Technology]</ref> Energy metering of an inverter may be of limited accuracy and not suitable for revenue metering purposes. A third-party data acquisition system can monitor multiple inverters, using the inverter manufacturer's protocols, and also acquire weather-related information. Independent [[smart meter]]s may measure the total energy production of a PV array system. Separate measures such as satellite image analysis or a solar radiation meter (a [[pyranometer]]) can be used to estimate total insolation for comparison.<ref>[https://buildingsfieldtest.nrel.gov/solar_irradiance_measurements Solar Irradiance Measurements]</ref>
Data collected from a monitoring system can be [[List of monitored photovoltaic power stations|displayed remotely]] over the World Wide Web. For example, the Open Solar Outdoors Test Field ([[OSOTF]])<ref>{{cite journal|last=Pearce|first=Joshua. M|coauthors=Adegboyega Babasola, Rob Andrews|title=Open Solar Photovoltaic Systems Optimization|journal=Proceedings of the 16th Annual National Collegiate Inventors and Innovators Alliance Conference|year=2012|pages=1–7|url=http://mtu.academia.edu/JoshuaPearce/Papers/1555998/Open_Solar_Photovoltaic_Systems_Optimization|publisher=NCIIA}}</ref>  is a grid-connected [[photovoltaic]] test system, which continuously monitors the output of a number of photovoltaic modules and correlates their performance to a long list of highly accurate meteorological readings. The OSOTF is organized under open source principles—All data and analysis is be made freely available to the entire photovoltaic community and the general public.<ref>[http://mtu.academia.edu/JoshuaPearce/Papers/1555998/Open_Solar_Photovoltaic_Systems_Optimization Open Solar Photovoltaic Systems Optimization]</ref>
The Fraunhofer Center for Sustainable Energy Systems maintains two test systems, one in Massachusetts, and the Outdoor Solar Test Field OTF-1 in Albuquerque, New Mexico, which opened in June 2012. A third site, OTF-2, also in Albuquerque, is under construction.<ref>[http://cse.fraunhofer.org/press-releases/cse-announces-opening-of-outdoor-solar-test-field/ Fraunhofer Center for Sustainable Energy Systems Announces Opening of Albuquerque Outdoor Solar Test Field]</ref>
Some companies offer analysis software to analyze system performance. Small residential systems may have minimal data analysis requirements other than perhaps total energy production; larger grid-connected power plants can benefit from more detailed investigations of performance.<ref>[http://www.pge.com/myhome/saveenergymoney/solarenergy/csi/csimeteringperformancemonitoring/ CSI—Metering and Performance Monitoring]</ref><ref>[http://www.campbellsci.com/solar-energy Solar Energy]</ref><ref>[http://www.solarcity.com/residential/solarguard-system-monitoring.aspx SolarGuard]</ref>
 
===Performance factors===
Uncertainties in revenue over time relate mostly to the evaluation of the solar resource and to the performance of the system itself. In the best of cases, uncertainties are typically 4% for year-to-year climate variability, 5% for solar resource estimation (in a horizontal plane), 3% for estimation of irradiation in the plane of the array, 3% for power rating of modules, 2% for losses due to dirt and soiling, 1.5% for losses due to snow, and 5% for other sources of error. Identifying and reacting to manageable losses is critical for revenue and O&M efficiency. Monitoring of array performance may be part of contractual agreements between the array owner, the builder, and the utility purchasing the energy produced. {{Citation needed|date=January 2012}} Recently, a method to create "synthetic days" using readily available weather data and verification using the [[Open Solar Outdoors Test Field]] make it possible to predict photovoltaic systems performance with high degrees of accuracy.<ref>Rob Andrews, Andrew Pollard, Joshua M. Pearce, “Improved parametric empirical determination of module short circuit current for modelling and optimization of solar photovoltaic systems”, ''Solar Energy'' '''86''', 2240-2254 (2012). [http://dx.doi.org/10.1016/j.solener.2012.04.016 DOI], [http://mtu.academia.edu/JoshuaPearce/Papers/1853740/Improved_parametric_empirical_determination_of_module_short_circuit_current_for_modelling_and_optimization_of_solar_photovoltaic_systems open access]</ref>  This method can be used to then determine loss mechanisms on a local scale - such as those from snow <ref name="open access"/><ref name="snow2"/> or the effects of surface coatings (e.g. [[hydrophobic]] or [[hydrophilic]]) on soiling or snow losses.<ref>Rob W. Andrews, Andrew Pollard, Joshua M. Pearce, [http://dx.doi.org/10.1016/j.solmat.2013.01.032 A new method to determine the effects of hydrodynamic surface coatings on the snow shedding effectiveness of solar photovoltaic modules]. ''Solar Energy Materials and Solar Cells'' '''113''' (2013) 71–78. [http://www.academia.edu/2937014/A_new_method_to_determine_the_effects_of_hydrodynamic_surface_coatings_on_the_snow_shedding_effectiveness_of_solar_photovoltaic_modules open access]</ref>
Access to the Internet has allowed a further improvement in energy monitoring and communication. Dedicated systems are available from a number of vendors. For solar PV system that use [[microinverters]] (panel-level DC to AC conversion), module power data is automatically provided. Some systems allow setting performance alerts that trigger phone/email/text warnings when limits are reached. These solutions provide data for the system owner and the installer. Installers are able to remotely monitor multiple installations, and see at-a-glance the status of their entire installed base.{{Citation needed|date=January 2012}}
 
===Module life===
Effective module lives are typically 25 years or more.<ref>{{cite web|url=http://www4.agr.gc.ca/AAFC-AAC/display-afficher.do?id=1187620075153&lang=eng|title=Solar Power (Photovoltaic, PV)|work=Agriculture and Agri-Food Canada|accessdate=5 February 2010}}</ref> The payback period for an investment in a PV solar installation varies greatly and is typically less useful than a calculation of [[return on investment]].<ref>[http://www.renewableenergyworld.com/rea/blog/post/2010/04/the-worst-metric-in-renewables-the-payback-period The Worst Metric in Renewables: 'The Payback Period']. Renewable Energy World (2010-04-19). Retrieved on 2012-10-01.</ref> While it is typically calculated to be between 10 and 20 years, the payback period can be far shorter with incentives.<ref>[http://news.bbc.co.uk/2/hi/science/nature/8751862.stm It's payback time for home generation]. BBC News (2010-06-22). Retrieved on 2012-04-23.</ref>
 
==Hybrid systems==
[[File:Hybrid Power System.gif|right]]
 
A hybrid system combines PV with other forms of generation, usually a diesel generator. Biogas is also used. The other form of generation may be a type able to modulate power output as a function of demand. However more than one renewable form of energy may be used e.g. wind. The photovoltaic power generation serves to reduce the consumption of non renewable fuel. Hybrid systems are most often found on islands. [[Pellworm]] island in Germany and [[Kythnos]] island in Greece are notable examples (both are combined with wind).<ref>[http://www.pvresources.com/en/hybrid.php PV resources website], Hybrid power station accessed 10 Feb 08</ref><ref>{{Wayback |date=20110719072419 |url=http://www.pellworm.de/energieversorgung.0.html |title=Daten und Fakten }}. Pellworm island website (in German)</ref> The Kythnos plant has reduced diesel consumption by 11.2%<ref>{{cite journal
| last = Darul’a
| first = Ivan
| coauthors = Stefan Marko
| title = Large scale integration of renewable electricity production into the grids
| journal = Journal of Eelectrical Engineering
| volume =58
| issue = 1
| pages = 58–60
| year = 2007
| url = http://iris.elf.stuba.sk/JEEEC/data/pdf/1_107-10.pdf
| format = PDF
| issn = 1335-3632
| accessdate = 2008-02-10 }}</ref>
 
There has also been recent work showing that the PV penetration limit can be increased by deploying a distributed network of PV+CHP hybrid systems in the U.S.<ref>{{cite journal|author=J. M. Pearce|doi=10.1016/j.energy.2009.08.012|title= Expanding Photovoltaic Penetration with Residential Distributed Generation from Hybrid Solar Photovoltaic + Combined Heat and Power Systems|journal=''Energy|volume=34|pages=1947–1954 |year=2009|url=http://hdl.handle.net/1974/5307 }}</ref> The temporal distribution of solar flux, electrical and heating requirements for representative U.S. single family residences were analyzed and the results clearly show that hybridizing CHP with PV can enable additional PV deployment above what is possible with a conventional centralized electric generation system. This theory was reconfirmed with numerical simulations using per second solar flux data to determine that the necessary battery backup to provide for such a hybrid system is possible with relatively small and inexpensive battery systems.<ref>P. Derewonko and J.M. Pearce, [http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5411247&isnumber=5411118 “Optimizing Design of Household Scale Hybrid Solar Photovoltaic + Combined Heat and Power Systems for Ontario”], Photovoltaic Specialists Conference (PVSC), 2009 34th IEEE, pp.1274–1279, 7–12 June 2009.</ref> In addition, large PV+CHP systems are possible for institutional buildings, which again provide back up for intermittent PV and reduce CHP runtime.<ref>M. Mostofi, A. H. Nosrat, and J. M. Pearce, “Institutional-Scale Operational Symbiosis of Photovoltaic and Cogeneration Energy Systems” ''International Journal of Environmental Science and Technology'' '''8'''(1), pp. 31–44, 2011. Available open access: [http://www.ijest.org/?_action=articleInfo&article=473]</ref>
 
==Standardization==
Increasing use of photovoltaic systems and integration of photovoltaic power into existing structures and techniques of supply and distribution increases the value of general standards and definitions for photovoltaic components and systems.{{Citation needed|date=April 2013}}
The standards are compiled at the [[International Electrotechnical Commission]] (IEC) and apply to efficiency, durability and safety of cells, modules, simulation programs, plug connectors and cables, mounting systems, overall efficiency of inverters etc.<ref>Regan Arndt and Dr. Ing Robert Puto. Basic Understanding of IEC Standard Testing For Photovoltaic Panels. Available: http://tuvamerica.com/services/photovoltaics/ArticleBasicUnderstandingPV.pdf</ref>
 
==Costs and economy==
Costs of production have been reduced dramatically in recent years for more widespread use through production and technological advances. For large-scale installations, prices below $1.00 per watt are now common.<ref>{{cite web |url=http://nationalinterest.org/commentary/the-end-the-nuclear-renaissance-6325?page=1 |title=The End of the Nuclear Renaissance &#124; |author=[[John Quiggin]] |date=January 3, 2012  |work=National Interest }}</ref> Crystal silicon [[solar cell]]s have largely been replaced by less expensive multicrystalline silicon solar cells, and thin film silicon solar cells have also been developed recently at lower costs of production. Although they are reduced in energy conversion efficiency from single crystalline "siwafers", they are also much easier to produce at comparably lower costs.<ref>[http://quantumsp.com/en/solar-energy/a-comparison-of-pv-technologies/ A Comparison of PV Technologies]</ref>
 
The table below shows the total cost in US cents per kWh of electricity generated by a photovoltaic system.<ref><math>p = \frac{I\cdot (1+i)+\sum_{t=0}^T \frac{I \cdot b}{(1+i)^t}}{\sum_{t=0}^T\frac{E\cdot (1-v)^t}{(1+i)^t}}</math></ref><ref>[http://www.solar-estimate.org/showfaq.php?id=261 What is Levelized Cost?]</ref> The row headings on the left show the total cost, per peak kilowatt (kW<sub>p</sub>), of a photovoltaic installation. Photovoltaic system costs have been declining and in Germany, for example, were reported to have fallen to USD 2200/kW<sub>p</sub> by the second quarter of 2012.<ref>[http://www.irena.org/DocumentDownloads/Publications/Renewable_Power_Generation_Costs.pdf IRENA: Renewable Power Generation Costs (German Photovoltaic System Costs: USD 2200/kW; Page 9)]</ref> The column headings across the top refer to the annual energy output in kWh expected from each installed kW<sub>p</sub>. This varies by geographic region because the average [[insolation]] depends on the average cloudiness and the thickness of atmosphere traversed by the sunlight. It also depends on the path of the sun relative to the panel and the horizon.
Panels are usually mounted at an angle based on latitude, and often they are adjusted seasonally to meet the changing solar [[declination]]. [[Solar tracking]] can also be utilized to access even more perpendicular sunlight, thereby raising the total energy output.
 
The calculated values in the table reflect the total cost in cents per kWh produced. They assume a 10% total capital cost (for instance 4% [[interest rate]], 1% operating and maintenance cost,<ref>[http://www1.eere.energy.gov/solar/pdfs/46025.pdf PV operation and maintenance costs]. (PDF) . Retrieved on 2012-04-23.</ref> and [[Straight-line depreciation|depreciation]] of the capital outlay over 20 years). Normally, photovoltaic modules have a 25 year warranty.<ref>[http://solarconsumerreporting.webs.com/warranties.htm Solar PV warranties]</ref><ref>[https://www.cleanenergyexperts.com/2011/02/01/understanding-solar-panel-warranties/ Understanding Solar Panel Warrantees]</ref>
 
{| class="wikitable"
|+Cost per kilowatt hour (US cents/kWh)
|- {{highlight1}}
! style="background:#fff;"| 20 years || 2400 <br><small>kWh/kW<sub>p</sub> y</small> || 2200 <br><small>kWh/kW<sub>p</sub> y</small> || 2000 <br><small>kWh/kW<sub>p</sub> y</small> || 1800 <br><small>kWh/kW<sub>p</sub> y</small>|| 1600 <br><small>kWh/kW<sub>p</sub> y</small>|| 1400 <br><small>kWh/kW<sub>p</sub> y</small>|| 1200 <br><small>kWh/kW<sub>p</sub> y</small>|| 1000 <br><small>kWh/kW<sub>p</sub> y</small>|| 800 <br><small>kWh/kW<sub>p</sub> y</small>
|- style="text-align:right;"
|  style="background:#feb;"| $200 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 0.8
|  style="background:#0f0;"| 0.9
|  style="background:#0f0;"| 1.0
|  style="background:#0f0;"| 1.1
|  style="background:#0f0;"| 1.3
|  style="background:#0f0;"| 1.4
|  style="background:#0f0;"| 1.7
|  style="background:#0f0;"| 2.0
|  style="background:#0f0;"| 2.5
|- style="text-align:right;"
|  style="background:#feb;"| $600 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 2.5
|  style="background:#0f0;"| 2.7
|  style="background:#0f0;"| 3.0
|  style="background:#0f0;"| 3.3
|  style="background:#0f0;"| 3.8
|  style="background:#0f0;"| 4.3
|  style="background:#0f0;"| 5.0
|  style="background:#0f0;"| 6.0
|  style="background:#0f0;"| 7.5
|- style="text-align:right;"
|  style="background:#feb;"| $1000 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 4.2
|  style="background:#0f0;"| 4.5
|  style="background:#0f0;"| 5.0
|  style="background:#0f0;"| 5.6
|  style="background:#0f0;"| 6.3
|  style="background:#0f0;"| 7.1
|  style="background:#0f0;"| 8.3
|  style="background:#0f0;"| 10.0
|  style="background:#0f0;"| 12.5
|- style="text-align:right;"
|  style="background:#feb;"| $1400 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 5.8
|  style="background:#0f0;"| 6.4
|  style="background:#0f0;"| 7.0
|  style="background:#0f0;"| 7.8
|  style="background:#0f0;"| 8.8
|  style="background:#0f0;"| 10.0
|  style="background:#0f0;"| 11.7
|  style="background:#0f0;"| 14.0
|  style="background:#ff0;"| 17.5
|- style="text-align:right;"
|  style="background:#feb;"| $1800 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 7.5
|  style="background:#0f0;"| 8.2
|  style="background:#0f0;"| 9.0
|  style="background:#0f0;"| 10.0
|  style="background:#0f0;"| 11.3
|  style="background:#0f0;"| 12.9
|  style="background:#0f0;"| 15.0
|  style="background:#ff0;"| 18.0
|  style="background:#ff0;"| 22.5
|- style="text-align:right;"
|  style="background:#feb;"| $2200 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 9.2
|  style="background:#0f0;"| 10.0
|  style="background:#0f0;"| 11.0
|  style="background:#0f0;"| 12.2
|  style="background:#0f0;"| 13.8
|  style="background:#ff0;"| 15.7
|  style="background:#ff0;"| 18.3
|  style="background:#ff0;"| 22.0
|  style="background:#ff0;"| 27.5
|- style="text-align:right;"
|  style="background:#feb;"| $2600 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 10.8
|  style="background:#0f0;"| 11.8
|  style="background:#0f0;"| 13.0
|  style="background:#0f0;"| 14.4
|  style="background:#ff0;"| 16.3
|  style="background:#ff0;"| 18.6
|  style="background:#ff0;"| 21.7
|  style="background:#ff0;"| 26.0
|  style="background:#f00;"| 32.5
|- style="text-align:right;"
|  style="background:#feb;"| $3000 <small>/kW<sub>p</sub></small>
|  style="background:#0f0;"| 12.5
|  style="background:#0f0;"| 13.6
|  style="background:#0f0;"| 15.0
|  style="background:#ff0;"| 16.7
|  style="background:#ff0;"| 18.8
|  style="background:#ff0;"| 21.4
|  style="background:#ff0;"| 25.0
|  style="background:#f00;"| 30.0
|  style="background:#f00;"| 37.5
|}
 
During the cells life time, repairs will be necessary to keep the system running well. Repairs can be made on the actual structure to the sublethal effects and actions on cell membranes of near-UV, the interactions of different wavelengths, and the biological action of the mid-UV.<ref>{{cite book|last=Jagger|first=J|title=Solar-UV actions on living cells|year=1985|publisher=Bioscience|url=http://www.osti.gov/scitech/biblio/6730226}}</ref> Research has shown that some repairs have been based on irradiation in high efficiency metals which can be measured by admittance spectroscopy.<ref>{{cite journal|last=Jasenek|first=J|coauthors=U. Rau|title=Defect generation in Cu(In,Ga)Se2 heterojunction solar cells by high-energy electron and proton irradiation|journal=Journal of Applied Physics|date=17 April 2001|volume=90|issue=650|pages=9}}</ref> These can all lead to costly repairs over time. Although these repairs can be expensive, thermal events such as the one in Bakersfield, California can occur, as faulty arrays made the system overheat and catch flame. This lead to expose more faulty areas and a larger fire.<ref>{{cite journal|last=Brooks|first=Bill|title=The Bakersfield Fire: A Lesson in Ground-Fault Protection|journal=Solar Pro|date=February–March 2011|issue=4.2}}</ref>
 
==Regulation==
 
===United Kingdom===
In the UK, PV installations are generally considered permitted development and don't require planning permission. If the property is listed or in a designated area (National Park, Area of Outstanding Natural Beauty, Site of Special Scientific Interest or Norfolk Broads) then planning permission is required.<ref>[http://www.planningportal.gov.uk/permission/commonprojects/solarpanels/ Solar Panels]. Planning Portal. Retrieved on 2013-07-17.</ref>
 
===United States===
In the US Many localities require a license to install a photovoltaic system. A grid-tied system normally requires a licensed electrician to make the connection between the system and the grid-connected wiring of the building.<ref>{{cite web |url= http://www.bootsontheroof.com/index.php?option=com_content&view=article&id=32:requirements-for-solar-installation-a-incentives-by-state&catid=14&Itemid=65 |title=Requirements for Solar Installations |work=bootsontheroof.com |year=2011 |accessdate=March 31, 2011}}</ref> Installers who meet these qualifications are located in almost every state.<ref name="Solar Power World"/>
 
The State of California prohibits [[Homeowners' association]]s from restricting solar devices.<ref>{{cite web|url= http://www.dsireusa.org/solar/incentives/incentive.cfm?Incentive_Code=CA45R&re=1&ee=1 |title=California Solar Rights Act|accessdate=February 25, 2012}}</ref>
 
===Spain===
 
Although Spain uses about 20% of its energy  via photovoltaics as cities such as Huelva and Seville boast nearly 3,000 hours of sunshine per year, Spain has issued a solar tax to account for the debt created by the investment done by the Spanish government. Those who do not connect to the grid can face up to a fine of 30 million euros ($40 million USD).<ref>{{cite web|last=Hunt|first=Tam|title=Spain and Portugal Lead the Way on Renewable Energy Transformation|url=http://www.renewableenergyworld.com/rea/news/article/2011/02/spain-and-portugal-lead-the-way-on-renewable-energy-transformation|publisher=Renewable Energy World}}</ref><ref>{{cite news|last=Phillips Erb|first=Kelly|title=Out Of Ideas And In Debt, Spain Sets Sights On Taxing The Sun|url=http://www.forbes.com/sites/kellyphillipserb/2013/08/19/out-of-ideas-and-in-debt-spain-sets-sights-on-taxing-the-sun/|accessdate=10/4/13|newspaper=Forbes|date=8/19/13}}</ref>
 
==See also==
{{Portal|Renewable energy|Energy}}
* [[Maximum Power Point Tracker]]
* [[Photovoltaics]]
* [[Rooftop photovoltaic power station]]
* [[List of photovoltaic power stations]]
 
{{Photovoltaics}}
 
==References==
{{Reflist|2}}
 
==External links==
* [http://sunmetrix.com Solar/Photovoltaic Resource]
* [http://css.snre.umich.edu/css_doc/CSS07-08.pdf Photovoltaic Energy Factsheet] by the [[University of Michigan]]'s [http://www.css.snre.umich.edu/ Center for Sustainable Systems]
* Home Power Magazine http://www.homepower.com/
* [http://www.vectorcuatro.es/index.php?option=com_content&view=article&id=150&Itemid=218&lang=en Solar project management]
*[http://purl.fdlp.gov/GPO/gpo41519 Best Practices for Siting Solar Photovoltaics on Municipal Solid Waste Landfills: A Study Prepared in Partnership with the Environmental Protection Agency for the RE-Powering America’s Land Initiative: Siting Renewable Energy on Potentially Contaminated Land and Mine Sites] [[National Renewable Energy Laboratory]]
 
{{DEFAULTSORT:Photovoltaic System}}
[[Category:Photovoltaics]]

Revision as of 17:17, 11 January 2014

"Solar park" or "PV farm"

A photovoltaic system (informally, PV system) is an arrangement of components designed to supply usable electric power for a variety of purposes, using the Sun (or, less commonly, other light sources) as the power source.

PV systems may be built in various configurations:

  • Off-grid without battery (array-direct)
  • Off-grid with battery storage for DC-only appliances
  • Off-grid with battery storage for AC and DC appliances
  • Grid-tie without battery
  • Grid-tie with battery storage

A photovoltaic array (also called a solar array) consists of multiple photovoltaic modules, casually referred to as solar panels, to convert solar radiation (sunlight) into usable direct current (DC) electricity. A photovoltaic system for residential, commercial, or industrial energy supply normally contains an array of photovoltaic (PV) modules, one or more DC to alternating current (AC) power converters (also known as inverters), a racking system that supports the solar modules, electrical wiring and interconnections, and mounting for other components. Optionally, a photovoltaic system may include any or all of the following: renewable energy credit revenue-grade meter, maximum power point tracker (MPPT), battery system and charger, GPS solar tracker, energy management software, solar concentrators, solar irradiance sensors, anemometer, or task-specific accessories designed to meet specialized requirements for a system owner. The number of modules in the system determines the total DC watts capable of being generated by the solar array; however, the inverter ultimately governs the amount of AC watts that can be distributed for consumption. For example: A PV system comprising 11 kilowatts DC (kWDC) worth of PV modules, paired with one 10-kilowatt AC (kWAC) inverter, will be limited by the maximum output of the inverter: 10 kW AC.

A small PV system is capable of providing enough AC electricity to power a single home, or even an isolated device in the form of AC or DC electric. For example, military and civilian Earth observation satellites, street lights, construction and traffic signs, electric cars, solar-powered tents,[1] and electric aircraft may contain integrated photovoltaic systems to provide a primary or auxiliary power source in the form of AC or DC power, depending on the design and power demands.

Large grid-connected photovoltaic power systems are capable of providing an energy supply for multiple consumers. The electricity generated can be stored, used directly (island/standalone plant), fed into a large electricity grid powered by central generation plants (grid-connected or grid-tied plant), or combined with one, or many, domestic electricity generators to feed into a small electrical grid (hybrid plant).[2][3] PV systems are generally designed in order to ensure the highest energy yield for a given investment.

In the United States, the Authority Having Jurisdiction (AHJ) will review designs and issue permits, before construction can lawfully begin. Electrical installation practices must comply with standards set forth within the National Electrical Code (NEC) and be inspected by the AHJ to ensure compliance with building code, electrical code, and fire safety code. Jurisdictions may require that equipment has been tested, certified, listed, and labeled by at least one of the Nationally Recognized Testing Laboratories (NRTL). Despite the complicated installation process, a recent list of solar contractors shows a majority of installation companies were founded since 2000.[4]

Components

Silicon Boule & Solar Cell

In order to make a Monocrystalline solar cell, a silicon ingot, also known as a silicon boule (crystal), must first be produced. Once a silicon ingot has been made, it is thinly sliced and semiconductors are imbedded in the disk.[5] The silicon disk will have positive and negative leads, which serve as connection points to tie multiple cells in series. Once multiple cells are connected in series, the formation of a module begins. Other types of solar cells are available. See List of types of solar cells.

Amorphous Silicon Cell

Although this cell has the same elements as a monocrystalline solar cell, the main difference between each is the degradation period as well as price to produce the cell. Although technology is supposed to improve this technology, the monocrystalline cell is considered better, as there has been more advances and applications used for this type of cell.[6]

Photovoltaic modules

A photovoltaic array is a linked assembly of PV modules.
Ground mounted system
PV array on an old house

Due to the low voltage of an individual solar cell (typically ca. 0.5V), several cells are wired (see: Copper in photovoltaic power systems) in series in the manufacture of a "laminate". The laminate is assembled into a protective weatherproof enclosure, thus making a photovoltaic module or solar panel. Modules may then be strung together into a photovoltaic array.

Photovoltaic arrays

A photovoltaic array (or solar array) is a linked collection of solar panels.[7] The power that one module can produce is seldom enough to meet requirements of a home or a business, so the modules are linked together to form an array. Most PV arrays use an inverter to convert the DC power produced by the modules into alternating current that can power lights, motors, and other loads. The modules in a PV array are usually first connected in series to obtain the desired voltage; the individual strings are then connected in parallel to allow the system to produce more current. Solar panels are typically measured under STC (standard test conditions) or PTC (PVUSA test conditions), in watts.[8] Typical panel ratings range from less than 100 watts to over 400 watts.[9] The array rating consists of a summation of the panel ratings, in watts, kilowatts, or megawatts.

Mounting systems

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. Modules are assembled into arrays on some kind of mounting system, which may be classified as ground mount, roof mount or pole mount. For solar parks a large rack is mounted on the ground, and the modules mounted on the rack. For buildings, many different racks have been devised for pitched roofs. For flat roofs, racks, bins and building integrated solutions are used.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park. Solar panel racks mounted on top of poles can be stationary or moving, see Trackers below. Side-of-pole mounts are suitable for situations where a pole has something else mounted at its top, such as a light fixture or an antenna. Pole mounting raises what would otherwise be a ground mounted array above weed shadows and livestock, and may satisfy electrical code requirements regarding inaccessibility of exposed wiring. Pole mounted panels are open to more cooling air on their underside, which increases performance. A multiplicity of pole top racks can be formed into a parking carport or other shade structure. A rack which does not follow the sun from left to right may allow seasonal adjustment up or down.

Trackers

A solar tracker tilts a solar panel throughout the day. Depending on the type of tracking system, the panel is either aimed directly at the sun or the brightest area of a partly clouded sky. Trackers greatly enhance early morning and late afternoon performance, increasing the total amount of power produced by a system by about 20–25% for a single axis tracker and about 30% or more for a dual axis tracker, depending on latitude.[10][11] Trackers are effective in regions that receive a large portion of sunlight directly. In diffuse light (i.e. under cloud or fog), tracking has little or no value. Because most concentrated photovoltaics systems are very sensitive to the sunlight's angle, tracking systems allow them to produce useful power for more than a brief period each day.[12] Tracking systems improve performance for two main reasons. First, when a solar panel is perpendicular to the sunlight, it receives more light on its surface than if it were angled. Second, direct light is used more efficiently than angled lightPotter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.. Special Anti-reflective coatings can improve solar panel efficiency for direct and angled light, somewhat reducing the benefit of tracking.[13]

Inverters

Inverter for grid connected PV

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. Systems designed to deliver alternating current (AC), such as grid-connected applications need an inverter to convert the direct current (DC) from the solar modules to AC. Grid connected inverters must supply AC electricity in sinusoidal form, synchronized to the grid frequency, limit feed in voltage to no higher than the grid voltage and disconnect from the grid if the grid voltage is turned off.[14] Islanding inverters need only produce regulated voltages and frequencies in a sinusoidal waveshape as no synchronisation or co-ordination with grid supplies is required. A solar inverter may connect to a string of solar panels. In some installations a solar micro-inverter is connected at each solar panel.[15] For safety reasons a circuit breaker is provided both on the AC and DC side to enable maintenance. AC output may be connected through an electricity meter into the public grid.[16]

Maximum power point tracking and charge control

Maximum power point tracking (MPPT) is used to maximize module output power. The power output of a module varies as a function of the voltage in a way that power generation can be optimized by varying the system voltage to find the 'maximum power point'. Some inverters incorporate maximum power point tracking.[17]

In the case of PV systems which include a battery, a charge controller[18] is needed to adjust the constantly varying voltage and current available from PV panels, to correctly charge the battery. Basic charge controllers may simply turn the PV panels on and off, or may meter out pulses of energy as needed, a strategy called PWM or pulse-width modulation. More advanced charge controllers will incorporate MPPT logic into their battery charging algorithms. Charge controllers may also divert energy to some purpose other than battery charging. Rather than simply shut off the free PV energy when not needed, a user may choose to heat air or water once the battery is full.

A charge controller with MPPT capability frees the system designer from closely matching available PV voltage to battery voltage. Considerable efficiency gains can be achieved, particularly when the PV array is located at some distance from the battery. By way of example, a 150 volt PV array connected to an MPPT charge controller can be used to charge a 24 or 48 volt battery. Higher array voltage means lower array current, so the savings in wiring costs can more than pay for the controller.

Monitoring and metering

The metering must be able to accumulate energy units in both directions or two meters must be used. Many meters accumulate bidirectionally, some systems use two meters, but a unidirectional meter (with detent) will not accumulate energy from any resultant feed into the grid.[19]

In some countries, for installations over 30kWp a frequency and a voltage monitor with disconnection of all phases is required. This is done to prevent supplying excess power to the grid, in the unusual case where more solar power is being generated than can be accommodated by the utility, and can not either be exported or stored. Grid operators historically have needed to provide transmission lines and generation capacity. Now they need to also provide storage. This is normally hydro-storage, but other means of storage are used. Initially storage was used so that baseload generators could operate at full output. With variable renewable energy, storage is needed to allow power generation whenever it is available, and consumption whenever it is needed. The two variables a grid operator have are storing electricity for when it is needed, or transmitting it to where it is needed. If both of those fail, installations over 30kWp can automatically shut down, although in practice all inverters maintain voltage regulation and stop supplying power if the load is inadequate. Grid operators have the option of curtailing excess generation from large systems, although this is more commonly done with wind power than solar power, and results in a substantial loss of revenue.[20] Inverters have the unique option of supplying reactive power which can be advantageous in matching load requirements.[21]

Standalone applications

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church.

Solar powered parking meter.
The solar panels on this small yacht at sea can charge the 12 volt batteries at up to 9 amperes in full, direct sunlight.

A standalone system does not have a connection to the electricity "mains" (aka "grid"). Standalone systems vary widely in size and application from wristwatches or calculators to remote buildings or spacecraft. If the load is to be supplied independently of solar insolation, the generated power is stored and buffered with a battery. In non-portable applications where weight is not an issue, such as in buildings, lead acid batteries are most commonly used for their low cost and tolerance for abuse. A charge controller may be incorporated in the system to: a) avoid battery damage by excessive charging or discharging and, b) optimizing the production of the cells or modules by maximum power point tracking (MPPT). However, in simple PV systems where the PV module voltage is matched to the battery voltage, the use of MPPT electronics is generally considered unnecessary, since the battery voltage is stable enough to provide near-maximum power collection from the PV module. In small devices (e.g. calculators, parking meters) only direct current (DC) is consumed. In larger systems (e.g. buildings, remote water pumps) AC is usually required. To convert the DC from the modules or batteries into AC, an inverter is used.

Pumps

Solar well pumps are common and widespread.[22][23] They often meet a need for water beyond the reach of power lines, taking the place of a windmill or windpump. One common application is the filling of livestock watering tanks, so that grazing cattle may drink. Another is the refilling of drinking water storage tanks on remote or self-sufficient homes.

Fans

Connecting a photovoltaic panel directly to a DC mechanical fan motor can provide air movement when it is most needed during the day. Common applications include both attic and greenhouse ventilation. Increased efficiency can be obtained by interposing a linear current booster (LCB) between the solar panel and the fan motor, to more closely coordinate varying panel output with motor energy requirements. Other controls sometimes used are timers and thermostats, so that the fan does not run when not wanted, even if the sun is shining.

Solar vehicles

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. Ground, water, air or space vehicles may obtain some or all of the energy required for their operation from the sun. Surface vehicles generally require higher power levels than can be sustained by a practically sized solar array, so a battery is used to meet peak power demand, and the solar array recharges it. Space vehicles have successfully used solar photovoltaic systems for years of operation, eliminating the weight of fuel or primary batteries.

Small scale solar systems

Profile picture of a mobile solar powered generator

With a growing DIY-community and an increasing interest in environmentally friendly "green energy", some hobbyists have endeavored to build their own PV solar systems from kits[24] or partly diy.[25] Usually, the DIY-community uses inexpensive[26] or high efficiency systems[27] (such as those with solar tracking) to generate their own power. As a result, the DIY-systems often end up cheaper than their commercial counterparts.[28] Often, the system is also hooked up into the regular power grid, using net metering instead of a battery for backup. These systems usually generate power amount of ~2 kW or less. Through the internet, the community is now able to obtain plans to construct the system (at least partly DIY) and there is a growing trend toward building them for domestic requirements. Small scale solar systems are now also being used both in developed countries and in developing countries, for residences and small businesses.[29][30] One of the most cost effective solar applications is a solar powered pump, as it is far cheaper to purchase a solar panel than it is to run power lines.[31]

Grid-connected applications

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church.

Diagram of a residential grid-connected PV system

A grid connected system is connected to a larger independent grid (typically the public electricity grid) and feeds energy directly into the grid. This energy may be shared by a residential or commercial building before or after the revenue measurement point. The difference being whether the credited energy production is calculated independently of the customer's energy consumption (feed-in tariff) or only on the difference of energy (net metering). Grid connected systems vary in size from residential (2-10kWp) to solar power stations (up to 10s of MWp). This is a form of decentralized electricity generation. The feeding of electricity into the grid requires the transformation of DC into AC by a special, synchronising grid-tie inverter.[32] In kW sized installations the DC side system voltage is as high as permitted (typically 1000V except US residential 600V) to limit ohmic losses. Most modules (72 crystalline silicon cells) generate 160W to 300W at 36 volts. It is sometimes necessary or desirable to connect the modules partially in parallel rather than all in series. One set of modules connected in series is known as a 'string'.[33]

Connection to DC grids

DC grids are found in electric powered transport: railways trams and trolleybuses. A few pilot plants for such applications have been built, such as the tram depots in Hannover Leinhausen, using photovoltaic contributors[34] and Geneva (Bachet de Pesay).[35] The 150 kWp Geneva site feeds 600V DC directly into the tram/trolleybus electricity network whereas before it provided about 15% of the electricity at its opening in 1999.

Building-mounted and building-integrated systems

In urban and suburban areas, photovoltaic arrays are commonly used on rooftops to supplement power use; often the building will have a connection to the power grid, in which case the energy produced by the PV array can be sold back to the utility in some sort of net metering agreement. Some utilities, such as Solvay Electric in Solvay, NY, use the rooftops of commercial customers and telephone poles to support their use of PV panels.[36] Solar trees are arrays that, as the name implies, mimic the look of trees, provide shade, and at night can function as street lights. In agricultural settings, the array may be used to directly power DC pumps, without the need for an inverter. In remote settings such as mountainous areas, islands, or other places where a power grid is unavailable, solar arrays can be used as the sole source of electricity, usually by charging a storage battery.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park. There is financial support available for people wishing to install PV arrays. Incentives range from federal tax credits to state tax credits and rebates to utility loans and rebates. A listing of current incentives can be found at the Database of State Incentives for Renewables and Efficiency. In the UK, households are paid a 'Feedback Fee' to buy excess electricity at a flat rate per kWh. This is up to 44.3p/kWh which can allow a home to earn double their usual annual domestic electricity bill.[37] The current UK feed-in tariff system is due for review on 31 March 2012, after which the current scheme may no longer be available.[38]Template:Qn

Ground-, building- and roof-mounted PV solar systems planning and permit

In urban and suburban areas, providing plans and structural calculations may be required by your local governing jurisdiction. Check with your local City/County. http://solarstructuralcalcs.com offer ground mount solar pv plans, roof mount solar pv plans, and structural calculations analysis for residential and commercial projects nationwide.

Power plants

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church.

Waldpolenz Solar Park, Germany

A photovoltaic power station (solar park or solar farm) is a power station using photovoltaic modules and inverters for utility scale electricity generation, connected to an electricity transmission grid. Some large photovoltaic power stations like Waldpolenz Solar Park and Topaz Solar Farm cover tens or hundreds of hectares and have power outputs up to hundreds of megawatts.

System performance

Insolation and energy

Solar insolation is made up of direct radiation, diffuse radiation and reflected radiation (or albedo).The absorption factor of a PV cell is defined as the fraction of incident solar irradiance that is absorbed by the cell.[39] At high noon on a cloudless day at the equator, the power of the sun is about 1 kW/m²,[40] on the Earth's surface, to a plane that is perpendicular to the sun's rays. As such, PV arrays can track the sun through each day to greatly enhance energy collection. However, tracking devices add cost, and require maintenance, so it is more common for PV arrays to have fixed mounts that tilt the array and face solar noon (approximately due south in the Northern Hemisphere or due north in the Southern Hemisphere). The tilt angle, from horizontal, can be varied for season,[41] but if fixed, should be set to give optimal array output during the peak electrical demand portion of a typical year for a stand alone system. This optimal module tilt angle is not necessarily identical to the tilt angle for maximum annual array energy output.[42] The optimization of the a photovoltaic system for a specific environment can be complicated as issues of solar flux, soiling, and snow losses should be taken into effect. In addition, recent work has shown that spectral effects can play a role in optimal photovoltaic material selection. For example, the spectral albedo can play a significant role in output depending on the surface around the photovoltaic system.[43]

For the weather and latitudes of the United States and Europe, typical insolation ranges from 4 kWh/m²/day in northern climes to 6.5 kWh/m²/day in the sunniest regions. Typical solar panels have an average efficiency of 15%, with the best commercially available panels at 21%. Thus, a photovoltaic installation in the southern latitudes of Europe or the United States may expect to produce 1 kWh/m²/day. A typical "150 watt" solar panel is about a square meter in size. Such a panel may be expected to produce 0.75 kWh every day, on average, after taking into account the weather and the latitude, for an insolation of 5 sun hours/day. A typical 1 kW photovoltaic installation in Australia or the southern latitudes of Europe or United States, may produce 3.5-5 kWh per day, dependent on location, orientation, tilt, insolation and other factors.[44] In the Sahara desert, with less cloud cover and a better solar angle, one could ideally obtain closer to 8.3 kWh/m²/day provided the nearly ever present wind would not blow sand onto the units. The area of the Sahara desert is over 9 million km². 90,600 km², or about 1%, could generate as much electricity as all of the world's power plants combined.[45]

Tracking the sun

Trackers and sensors to optimise the performance are often seen as optional, but tracking systems can increase viable output by up to 45%.[7][46] PV arrays that approach or exceed one megawatt often use solar trackers. Accounting for clouds, and the fact that most of the world is not on the equator, and that the sun sets in the evening, the correct measure of solar power is insolation – the average number of kilowatt-hours per square meter per day. For the weather and latitudes of the United States and Europe, typical insolation ranges from 2.26 kWh/m²/day in northern climes to 5.61 kWh/m²/day in the sunniest regions.[47][48]

For large systems, the energy gained by using tracking systems can outweigh the added complexity (trackers can increase efficiency by 30% or more). For very large systems, the added maintenance of tracking is a substantial detriment.[49] Tracking is not required for flat panel and low-concentration photovoltaic systems. For high-concentration photovoltaic systems, dual axis tracking is a necessity.[50]

Pricing trends affect the balance between adding more stationary solar panels versus having fewer panels that track. When solar panel prices drop, trackers become a less attractive option.

Shading and dirt

Photovoltaic cell electrical output is extremely sensitive to shading. The effects of this shading are well known.[51][52][53] When even a small portion of a cell, module, or array is shaded, while the remainder is in sunlight, the output falls dramatically due to internal 'short-circuiting' (the electrons reversing course through the shaded portion of the p-n junction). If the current drawn from the series string of cells is no greater than the current that can be produced by the shaded cell, the current (and so power) developed by the string is limited. If enough voltage is available from the rest of the cells in a string, current will be forced through the cell by breaking down the junction in the shaded portion. This breakdown voltage in common cells is between 10 and 30 volts. Instead of adding to the power produced by the panel, the shaded cell absorbs power, turning it into heat. Since the reverse voltage of a shaded cell is much greater than the forward voltage of an illuminated cell, one shaded cell can absorb the power of many other cells in the string, disproportionately affecting panel output. For example, a shaded cell may drop 8 volts, instead of adding 0.5 volts, at a particular current level, thereby absorbing the power produced by 16 other cells.[54] It is, thus important that a PV installation is not shaded by trees or other obstructions. Several methods have been developed to determine shading losses from trees to PV systems over both large regions using LiDAR,[55] but also at an individual system level using sketchup.[56] Most modules have bypass diodes between each cell or string of cells that minimize the effects of shading and only lose the power of the shaded portion of the array. The main job of the bypass diode is to eliminate hot spots that form on cells that can cause further damage to the array, and cause fires. Sunlight can be absorbed by dust, snow, or other impurities at the surface of the module. This can reduce the light that strikes the cells. In general these losses aggregated over the year are small even for locations in Canada.[57] Maintaining a clean module surface will increase output performance over the life of the module. Google found that cleaning the flat mounted solar panels after 15 months increased their output by almost 100%, but that the 5% tilted arrays were adequately cleaned by rainwater.[58][59]

Temperature

Module output and life are also degraded by increased temperature. Allowing ambient air to flow over, and if possible behind, PV modules reduces this problem.

Module efficiency

In 2012, solar panels available for consumers can have an efficiency of up to about 17%,[60] while commercially available panels can go as far as 27%. It has been recorded that a group from the The Fraunhofer Institute for Solar Energy Systems have created a cell that can reach 44.7% efficiency, which will make scientists hopes to reach the 50% efficiency threshold a lot more feasible.[61][62][63][64]

Monitoring

Photovoltaic systems need to be monitored to detect breakdown and optimize their operation. Several photovoltaic monitoring strategies depending on the output of the installation and its nature. Monitoring can be performed on site or remotely. It can measure production only, retrieve all the data from the inverter or retrieve all of the data from the communicating equipment (probes, meters, etc.). Monitoring tools can be dedicated to supervision only or offer additional functions. Individual inverters and battery charge controllers may include monitoring using manufacturer specific protocols and software.[65] Energy metering of an inverter may be of limited accuracy and not suitable for revenue metering purposes. A third-party data acquisition system can monitor multiple inverters, using the inverter manufacturer's protocols, and also acquire weather-related information. Independent smart meters may measure the total energy production of a PV array system. Separate measures such as satellite image analysis or a solar radiation meter (a pyranometer) can be used to estimate total insolation for comparison.[66] Data collected from a monitoring system can be displayed remotely over the World Wide Web. For example, the Open Solar Outdoors Test Field (OSOTF)[67] is a grid-connected photovoltaic test system, which continuously monitors the output of a number of photovoltaic modules and correlates their performance to a long list of highly accurate meteorological readings. The OSOTF is organized under open source principles—All data and analysis is be made freely available to the entire photovoltaic community and the general public.[68] The Fraunhofer Center for Sustainable Energy Systems maintains two test systems, one in Massachusetts, and the Outdoor Solar Test Field OTF-1 in Albuquerque, New Mexico, which opened in June 2012. A third site, OTF-2, also in Albuquerque, is under construction.[69] Some companies offer analysis software to analyze system performance. Small residential systems may have minimal data analysis requirements other than perhaps total energy production; larger grid-connected power plants can benefit from more detailed investigations of performance.[70][71][72]

Performance factors

Uncertainties in revenue over time relate mostly to the evaluation of the solar resource and to the performance of the system itself. In the best of cases, uncertainties are typically 4% for year-to-year climate variability, 5% for solar resource estimation (in a horizontal plane), 3% for estimation of irradiation in the plane of the array, 3% for power rating of modules, 2% for losses due to dirt and soiling, 1.5% for losses due to snow, and 5% for other sources of error. Identifying and reacting to manageable losses is critical for revenue and O&M efficiency. Monitoring of array performance may be part of contractual agreements between the array owner, the builder, and the utility purchasing the energy produced. Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park. Recently, a method to create "synthetic days" using readily available weather data and verification using the Open Solar Outdoors Test Field make it possible to predict photovoltaic systems performance with high degrees of accuracy.[73] This method can be used to then determine loss mechanisms on a local scale - such as those from snow [57][59] or the effects of surface coatings (e.g. hydrophobic or hydrophilic) on soiling or snow losses.[74] Access to the Internet has allowed a further improvement in energy monitoring and communication. Dedicated systems are available from a number of vendors. For solar PV system that use microinverters (panel-level DC to AC conversion), module power data is automatically provided. Some systems allow setting performance alerts that trigger phone/email/text warnings when limits are reached. These solutions provide data for the system owner and the installer. Installers are able to remotely monitor multiple installations, and see at-a-glance the status of their entire installed base.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.

Module life

Effective module lives are typically 25 years or more.[75] The payback period for an investment in a PV solar installation varies greatly and is typically less useful than a calculation of return on investment.[76] While it is typically calculated to be between 10 and 20 years, the payback period can be far shorter with incentives.[77]

Hybrid systems

A hybrid system combines PV with other forms of generation, usually a diesel generator. Biogas is also used. The other form of generation may be a type able to modulate power output as a function of demand. However more than one renewable form of energy may be used e.g. wind. The photovoltaic power generation serves to reduce the consumption of non renewable fuel. Hybrid systems are most often found on islands. Pellworm island in Germany and Kythnos island in Greece are notable examples (both are combined with wind).[78][79] The Kythnos plant has reduced diesel consumption by 11.2%[80]

There has also been recent work showing that the PV penetration limit can be increased by deploying a distributed network of PV+CHP hybrid systems in the U.S.[81] The temporal distribution of solar flux, electrical and heating requirements for representative U.S. single family residences were analyzed and the results clearly show that hybridizing CHP with PV can enable additional PV deployment above what is possible with a conventional centralized electric generation system. This theory was reconfirmed with numerical simulations using per second solar flux data to determine that the necessary battery backup to provide for such a hybrid system is possible with relatively small and inexpensive battery systems.[82] In addition, large PV+CHP systems are possible for institutional buildings, which again provide back up for intermittent PV and reduce CHP runtime.[83]

Standardization

Increasing use of photovoltaic systems and integration of photovoltaic power into existing structures and techniques of supply and distribution increases the value of general standards and definitions for photovoltaic components and systems.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park. The standards are compiled at the International Electrotechnical Commission (IEC) and apply to efficiency, durability and safety of cells, modules, simulation programs, plug connectors and cables, mounting systems, overall efficiency of inverters etc.[84]

Costs and economy

Costs of production have been reduced dramatically in recent years for more widespread use through production and technological advances. For large-scale installations, prices below $1.00 per watt are now common.[85] Crystal silicon solar cells have largely been replaced by less expensive multicrystalline silicon solar cells, and thin film silicon solar cells have also been developed recently at lower costs of production. Although they are reduced in energy conversion efficiency from single crystalline "siwafers", they are also much easier to produce at comparably lower costs.[86]

The table below shows the total cost in US cents per kWh of electricity generated by a photovoltaic system.[87][88] The row headings on the left show the total cost, per peak kilowatt (kWp), of a photovoltaic installation. Photovoltaic system costs have been declining and in Germany, for example, were reported to have fallen to USD 2200/kWp by the second quarter of 2012.[89] The column headings across the top refer to the annual energy output in kWh expected from each installed kWp. This varies by geographic region because the average insolation depends on the average cloudiness and the thickness of atmosphere traversed by the sunlight. It also depends on the path of the sun relative to the panel and the horizon. Panels are usually mounted at an angle based on latitude, and often they are adjusted seasonally to meet the changing solar declination. Solar tracking can also be utilized to access even more perpendicular sunlight, thereby raising the total energy output.

The calculated values in the table reflect the total cost in cents per kWh produced. They assume a 10% total capital cost (for instance 4% interest rate, 1% operating and maintenance cost,[90] and depreciation of the capital outlay over 20 years). Normally, photovoltaic modules have a 25 year warranty.[91][92]

Cost per kilowatt hour (US cents/kWh)
20 years 2400
kWh/kWp y
2200
kWh/kWp y
2000
kWh/kWp y
1800
kWh/kWp y
1600
kWh/kWp y
1400
kWh/kWp y
1200
kWh/kWp y
1000
kWh/kWp y
800
kWh/kWp y
$200 /kWp 0.8 0.9 1.0 1.1 1.3 1.4 1.7 2.0 2.5
$600 /kWp 2.5 2.7 3.0 3.3 3.8 4.3 5.0 6.0 7.5
$1000 /kWp 4.2 4.5 5.0 5.6 6.3 7.1 8.3 10.0 12.5
$1400 /kWp 5.8 6.4 7.0 7.8 8.8 10.0 11.7 14.0 17.5
$1800 /kWp 7.5 8.2 9.0 10.0 11.3 12.9 15.0 18.0 22.5
$2200 /kWp 9.2 10.0 11.0 12.2 13.8 15.7 18.3 22.0 27.5
$2600 /kWp 10.8 11.8 13.0 14.4 16.3 18.6 21.7 26.0 32.5
$3000 /kWp 12.5 13.6 15.0 16.7 18.8 21.4 25.0 30.0 37.5

During the cells life time, repairs will be necessary to keep the system running well. Repairs can be made on the actual structure to the sublethal effects and actions on cell membranes of near-UV, the interactions of different wavelengths, and the biological action of the mid-UV.[93] Research has shown that some repairs have been based on irradiation in high efficiency metals which can be measured by admittance spectroscopy.[94] These can all lead to costly repairs over time. Although these repairs can be expensive, thermal events such as the one in Bakersfield, California can occur, as faulty arrays made the system overheat and catch flame. This lead to expose more faulty areas and a larger fire.[95]

Regulation

United Kingdom

In the UK, PV installations are generally considered permitted development and don't require planning permission. If the property is listed or in a designated area (National Park, Area of Outstanding Natural Beauty, Site of Special Scientific Interest or Norfolk Broads) then planning permission is required.[96]

United States

In the US Many localities require a license to install a photovoltaic system. A grid-tied system normally requires a licensed electrician to make the connection between the system and the grid-connected wiring of the building.[97] Installers who meet these qualifications are located in almost every state.[4]

The State of California prohibits Homeowners' associations from restricting solar devices.[98]

Spain

Although Spain uses about 20% of its energy via photovoltaics as cities such as Huelva and Seville boast nearly 3,000 hours of sunshine per year, Spain has issued a solar tax to account for the debt created by the investment done by the Spanish government. Those who do not connect to the grid can face up to a fine of 30 million euros ($40 million USD).[99][100]

See also

Sportspersons Hyslop from Nicolet, usually spends time with pastimes for example martial arts, property developers condominium in singapore singapore and hot rods. Maintains a trip site and has lots to write about after touring Gulf of Porto: Calanche of Piana.

Template:Photovoltaics

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

  1. ↑ Army evaluating transportable solar-powered tents | Article | The United States Army. Army.mil (2010-12-08). Retrieved on 2013-07-17.
  2. ↑ Types of PV systems. Florida Solar Energy Center (FSEC), a research institute of the University of Central Florida.
  3. ↑ Rahmani, R.; Fard, M.; Shojaei, A.A.; Othman, M.F.; Yusof, R., A complete model of stand-alone photovoltaic array in MATLAB-Simulink environment, 2011 IEEE Student Conference on Research and Development (SCOReD), pp 46–51, 2011.
  4. ↑ 4.0 4.1 Solar Power World
  5. ↑ Semiconductors: How do silicon boules not break off during semiconductor fabrication?. Quora. Retrieved on 2013-07-17.
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  8. ↑ Key Factors in selecting solar components
  9. ↑ List of Eligible SB1 Guidelines Compliant Photovoltaic Modules
  10. ↑ A Performance Calculator. Rredc.nrel.gov. Retrieved on 2012-04-23.
  11. ↑ Technological advantages. Mecasolar.com. Retrieved on 2012-04-23.
  12. ↑ o Al-Mohamad, Ali. "Efficiency improvements of photo-voltaic panels using a Sun-tracking system." Applied Energy 79, no. 3 (2004): 345-354.
  13. ↑ Reflective Coating Silicon Solar Cells Boosts Absorption Over 96 Percent. Scientificblogging.com (2008-11-03). Retrieved on 2012-04-23.
  14. ↑ Grid-Tied Inverter Safety. Homepower.com. Retrieved on 2012-04-23.
  15. ↑ Trend watch: Microinverters invade solar
  16. ↑ Services and Solutions for Photovoltaic Systems
  17. ↑ Inverter Technology for the Solar Industry
  18. ↑ [1]
  19. ↑ Residential Photovoltaic Metering and Interconnection Study
  20. ↑ Integrating Variable Renewable Energy in Electric Power Markets
  21. ↑ Smart PV Inverter Benefits for Utilities
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  24. ↑ People building their own solar systems from kits. Greenplanet4energy.com. Retrieved on 2012-04-23.
  25. ↑ Example of diy PV system with pictures. Instructables.com (2007-11-05). Retrieved on 2012-04-23.
  26. ↑ Graham, Michael. (2005-10-15) Low-cost PV solar kit preferred by diy-communities. Treehugger.com. Retrieved on 2012-04-23.
  27. ↑ Ken Darrow and Mike Saxenian The minimal educational requirement to take the REA or RES examination is four GCE "" level passes or equal. When you have taken the obligatory preparatory course offered by a CEA Authorised Course Supplier and want to apply for the exam, please click on right here.

    In an ordinary Singapore Tenancy Agreement, there is usually the reimbursement clause together with the diplomatic clause. This clause states that in the event you train the diplomatic clause, you will have to reimburse a part of the commission the landlord had paid to his agent. Figures additionally show that the number of property agents registered with the Council for Estate Companies (CEA) The property company watchdog mentioned property agents who did not continue with their registration were part timers Tuas South Road 5 Industrial Website on the market So the right way to be a Real Estate Agent in Singapore? Be registered with just one Licensed Estate Agent (Actual Estate Firm) Abroad Property Analysis Experiences Region Property Consultancy & Management Providers Pte Ltd UE Square (D09) – Residence For Hire

    final January. There are also fewer property companies in business, down by 5% to lower than 1,500. Other than passing a compulsory examination, registered property brokers also have to endure six hours of Some business players stated new agents face a tough time juggling this and shutting property deals. With a purpose to make the TA a sound authorized document to be honoured by all parties involved, it must be stamped by the Singapore Inland Revenue Authority (IRA). The costs for this process, a so-known as "stamp obligation", are to be borne by the tenant. Softening in residential property costs proceed, led by 2.8 per cent decline within the index for Remainder of Central Area Freehold improvement in the prestigious Ardmore Park / Claymore district with potential for en bloc sale

    An expert property agent in Singapore will assist you and defend your interest all through the purchase, secure the provide for you at the best possible price. With a a lot better data of Singapore, the agent can be in a greater position to recommend and recommendation on the selection of property. He may even ensure that all documents are in order and you might be coping with the rightful owner of the property. Singapore 529508 Contact Leon in OrangeTee or click here to read more if you wish to be property agent – Singapore Real Property Salesperson. Rental estate agent for condominiums, bungalows, semi-detached or public apartments in Singapore. Luxurious condo close to Somerset MRT Condominium For Sale – St Thomas Suites (D09) Singapore Contractors Affiliation Ltd Search

    Freehold Condo near Orchard The Edge on Cairnhill – Condominium For Sale One-cease service for expatriate and foreign patrons. Collection of properties for lease and for sale in Singapore. Property brokers for sale or rental of properties assisting property house owners and those searching for properties to rent or buy. Residences, homes and HDB's. Blk 138 Lorong Ah Soo, Singapore 530138. Commercial and residential property real property agents. 31 Scotts Road, Dean's Property Centre, Singapore 228225. Excessive-end apartment in singapore close to Orchard Road Condominium For Sale – Paterson Residence (D09) Property agent / real estate agent coping with leasing, rental, sale and buy of business and residential properties Meet the Manager Singapore Glass Affiliation REMAX Singapore New Launches

    Property companies embrace buy, sell or hire properties, financial planning, pattern forecasts, relocation, interior design and actual estate planning. Condominium For Lease – The Balmoral (D10) Shopping for a house is a large funding that calls for much consideration and research. The same applies for selling or renting a property, the place a lot effort and time should be spent in negotiating for supreme prices. To watch itemizing and transacted prices Our mistake was that we didn't have our personal agent. One that could have defined all this to us, why it was needed and so forth. But we still did not realise this at the moment, we just assumed that this agent (named A) was serving to us. Little did we know "A" was truly the homeowners agent and we had no 'declare' on him in any respect.

    Vendor Pays the Buyer's Dealer Commission via his itemizing agent. Underneath a Purchaser's Broker arrangement, the named brokerage and agent represent the customer. The price paid to the broker mostly is paid by the vendor. Some buyer dealer agreements include clauses that will compensate the brokerage for the price it's due less the quantity paid by the vendor. When I managed to sell a property for my shopper at double fast time and at a really good worth. The worth was higher than most models being bought at the moment. It was a lot of onerous work and naturally Luck performed an enormous part. The Consumer was very very grateful. Sellers pay a 2% commission. May be decrease for more expensive properties. CONTACTING ME We Will Achieve Your Wants And Desires In Actual Estate. villageearth.org
  28. ↑ Template:Cite web
  29. ↑ Energy
  30. ↑ Solar Lamps
  31. ↑ 'Pay bill for 4 months, get power for 25 years'
  32. ↑ How Solar Power Works
  33. ↑ Photovoltaic... Cell, Module, String, Array
  34. ↑ The minimal educational requirement to take the REA or RES examination is four GCE "" level passes or equal. When you have taken the obligatory preparatory course offered by a CEA Authorised Course Supplier and want to apply for the exam, please click on right here.

    In an ordinary Singapore Tenancy Agreement, there is usually the reimbursement clause together with the diplomatic clause. This clause states that in the event you train the diplomatic clause, you will have to reimburse a part of the commission the landlord had paid to his agent. Figures additionally show that the number of property agents registered with the Council for Estate Companies (CEA) The property company watchdog mentioned property agents who did not continue with their registration were part timers Tuas South Road 5 Industrial Website on the market So the right way to be a Real Estate Agent in Singapore? Be registered with just one Licensed Estate Agent (Actual Estate Firm) Abroad Property Analysis Experiences Region Property Consultancy & Management Providers Pte Ltd UE Square (D09) – Residence For Hire

    final January. There are also fewer property companies in business, down by 5% to lower than 1,500. Other than passing a compulsory examination, registered property brokers also have to endure six hours of Some business players stated new agents face a tough time juggling this and shutting property deals. With a purpose to make the TA a sound authorized document to be honoured by all parties involved, it must be stamped by the Singapore Inland Revenue Authority (IRA). The costs for this process, a so-known as "stamp obligation", are to be borne by the tenant. Softening in residential property costs proceed, led by 2.8 per cent decline within the index for Remainder of Central Area Freehold improvement in the prestigious Ardmore Park / Claymore district with potential for en bloc sale

    An expert property agent in Singapore will assist you and defend your interest all through the purchase, secure the provide for you at the best possible price. With a a lot better data of Singapore, the agent can be in a greater position to recommend and recommendation on the selection of property. He may even ensure that all documents are in order and you might be coping with the rightful owner of the property. Singapore 529508 Contact Leon in OrangeTee or click here to read more if you wish to be property agent – Singapore Real Property Salesperson. Rental estate agent for condominiums, bungalows, semi-detached or public apartments in Singapore. Luxurious condo close to Somerset MRT Condominium For Sale – St Thomas Suites (D09) Singapore Contractors Affiliation Ltd Search

    Freehold Condo near Orchard The Edge on Cairnhill – Condominium For Sale One-cease service for expatriate and foreign patrons. Collection of properties for lease and for sale in Singapore. Property brokers for sale or rental of properties assisting property house owners and those searching for properties to rent or buy. Residences, homes and HDB's. Blk 138 Lorong Ah Soo, Singapore 530138. Commercial and residential property real property agents. 31 Scotts Road, Dean's Property Centre, Singapore 228225. Excessive-end apartment in singapore close to Orchard Road Condominium For Sale – Paterson Residence (D09) Property agent / real estate agent coping with leasing, rental, sale and buy of business and residential properties Meet the Manager Singapore Glass Affiliation REMAX Singapore New Launches

    Property companies embrace buy, sell or hire properties, financial planning, pattern forecasts, relocation, interior design and actual estate planning. Condominium For Lease – The Balmoral (D10) Shopping for a house is a large funding that calls for much consideration and research. The same applies for selling or renting a property, the place a lot effort and time should be spent in negotiating for supreme prices. To watch itemizing and transacted prices Our mistake was that we didn't have our personal agent. One that could have defined all this to us, why it was needed and so forth. But we still did not realise this at the moment, we just assumed that this agent (named A) was serving to us. Little did we know "A" was truly the homeowners agent and we had no 'declare' on him in any respect.

    Vendor Pays the Buyer's Dealer Commission via his itemizing agent. Underneath a Purchaser's Broker arrangement, the named brokerage and agent represent the customer. The price paid to the broker mostly is paid by the vendor. Some buyer dealer agreements include clauses that will compensate the brokerage for the price it's due less the quantity paid by the vendor. When I managed to sell a property for my shopper at double fast time and at a really good worth. The worth was higher than most models being bought at the moment. It was a lot of onerous work and naturally Luck performed an enormous part. The Consumer was very very grateful. Sellers pay a 2% commission. May be decrease for more expensive properties. CONTACTING ME We Will Achieve Your Wants And Desires In Actual Estate. International Energy Agency (2001)
  35. ↑ site7. Ecotourisme.ch. Retrieved on 2012-04-23.
  36. ↑ [2]
  37. ↑ Feed in Tariffs. Microgeneration.com. Retrieved on 2012-04-23.
  38. ↑ FAQs on Solar Photovoltaic Panels at Swithenbanks, Solar Panels, Solar Hot Water, Water Turbines, Wind Turbines. Swithenbanks.co.uk. Retrieved on 2012-04-23.
  39. ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  40. ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  41. ↑ Optimum Tilt of Solar Panels
  42. ↑ Stand Alone Photovoltaic Lighting Systems
  43. ↑ Rob W. Andrews and Joshua M. Pearce, The effect of spectral albedo on amorphous silicon and crystalline silicon solar photovoltaic device performance, Solar Energy, 91,233–241 (2013). DOI:10.1016/j.solener.2013.01.030 open access
  44. ↑ Template:Cite web
  45. ↑ Sahara's solar power potential underlined
  46. ↑ Beginners' Guide to Solar Trackers: How to Increase Output for Your Home Solar Panel System
  47. ↑ Insolation Levels (Europe)
  48. ↑ 10 years Average Insolation Data
  49. ↑ Utility Scale Solar Power Plants
  50. ↑ Should You Install a Solar Tracker?
  51. ↑ Kajihara, Atsushi, and A. T. Harakawa. "Model of photovoltaic cell circuits under partial shading." Industrial Technology, 2005. ICIT 2005. IEEE International Conference on. IEEE, 2005.
  52. ↑ Drif, M., Perez, P. J., Aguilera, J., & Aguilar, J. D. (2008). A new estimation method of irradiance on a partially shaded PV generator in grid-connected photovoltaic systems. Renewable Energy, 33(9), 2048-2056.
  53. ↑ VENTRE, JERRY AUTOR. Photovoltaic systems engineering. CRC press, 2004.
  54. ↑ Ursula Eicker, Solar Technologies for Buildings, Wiley 2003, ISBN 0-471-48637-X, page 226
  55. ↑ H. T. Nguyen and J. M. Pearce, Incorporating Shading Losses in Solar Photovoltaic Potential Assessment at the Municipal Scale, Solar Energy 86(5), pp. 1245–1260 (2012). Source: http://www.academia.edu/1499891/Incorporating_Shading_Losses_in_Solar_Photovoltaic_Potential_Assessment_at_the_Municipal_Scale
  56. ↑ Z. Dereli, C. Yücedağ and J. M. Pearce, Simple and Low-Cost Method of Planning for Tree Growth and Lifetime Effects on Solar Photovoltaic Systems Performance, Solar Energy, 95, pp.300-307 (2013). Available: http://www.academia.edu/4074627/Simple_and_low-cost_method_of_planning_for_tree_growth_and_lifetime_effects_on_solar_photovoltaic_systems_performance
  57. ↑ 57.0 57.1 Rob Andrews and Joshua M. Pearce, “Prediction of Energy Effects on Photovoltaic Systems due to Snowfall Events” in: 2012 38th IEEE Photovoltaic Specialists Conference (PVSC). Presented at the 2012 38th IEEE Photovoltaic Specialists Conference (PVSC), pp. 003386 –003391. Available: DOI open access
  58. ↑ Should you spring clean your solar panels?
  59. ↑ 59.0 59.1 Rob W. Andrews, Andrew Pollard, Joshua M. Pearce, “The Effects of Snowfall on Solar Photovoltaic Performance ”, Solar Energy 92, 8497 (2013). DOI: http://dx.doi.org/10.1016/j.solener.2013.02.014 open access
  60. ↑ Template:Cite web
  61. ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  62. ↑ Template:Cite web
  63. ↑ Template:Cite web
  64. ↑ CPV Solar Cell Reach 27% System Efficiency
  65. ↑ Enphase Technology
  66. ↑ Solar Irradiance Measurements
  67. ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  68. ↑ Open Solar Photovoltaic Systems Optimization
  69. ↑ Fraunhofer Center for Sustainable Energy Systems Announces Opening of Albuquerque Outdoor Solar Test Field
  70. ↑ CSI—Metering and Performance Monitoring
  71. ↑ Solar Energy
  72. ↑ SolarGuard
  73. ↑ Rob Andrews, Andrew Pollard, Joshua M. Pearce, “Improved parametric empirical determination of module short circuit current for modelling and optimization of solar photovoltaic systems”, Solar Energy 86, 2240-2254 (2012). DOI, open access
  74. ↑ Rob W. Andrews, Andrew Pollard, Joshua M. Pearce, A new method to determine the effects of hydrodynamic surface coatings on the snow shedding effectiveness of solar photovoltaic modules. Solar Energy Materials and Solar Cells 113 (2013) 71–78. open access
  75. ↑ Template:Cite web
  76. ↑ The Worst Metric in Renewables: 'The Payback Period'. Renewable Energy World (2010-04-19). Retrieved on 2012-10-01.
  77. ↑ It's payback time for home generation. BBC News (2010-06-22). Retrieved on 2012-04-23.
  78. ↑ PV resources website, Hybrid power station accessed 10 Feb 08
  79. ↑ The minimal educational requirement to take the REA or RES examination is four GCE "" level passes or equal. When you have taken the obligatory preparatory course offered by a CEA Authorised Course Supplier and want to apply for the exam, please click on right here.

    In an ordinary Singapore Tenancy Agreement, there is usually the reimbursement clause together with the diplomatic clause. This clause states that in the event you train the diplomatic clause, you will have to reimburse a part of the commission the landlord had paid to his agent. Figures additionally show that the number of property agents registered with the Council for Estate Companies (CEA) The property company watchdog mentioned property agents who did not continue with their registration were part timers Tuas South Road 5 Industrial Website on the market So the right way to be a Real Estate Agent in Singapore? Be registered with just one Licensed Estate Agent (Actual Estate Firm) Abroad Property Analysis Experiences Region Property Consultancy & Management Providers Pte Ltd UE Square (D09) – Residence For Hire

    final January. There are also fewer property companies in business, down by 5% to lower than 1,500. Other than passing a compulsory examination, registered property brokers also have to endure six hours of Some business players stated new agents face a tough time juggling this and shutting property deals. With a purpose to make the TA a sound authorized document to be honoured by all parties involved, it must be stamped by the Singapore Inland Revenue Authority (IRA). The costs for this process, a so-known as "stamp obligation", are to be borne by the tenant. Softening in residential property costs proceed, led by 2.8 per cent decline within the index for Remainder of Central Area Freehold improvement in the prestigious Ardmore Park / Claymore district with potential for en bloc sale

    An expert property agent in Singapore will assist you and defend your interest all through the purchase, secure the provide for you at the best possible price. With a a lot better data of Singapore, the agent can be in a greater position to recommend and recommendation on the selection of property. He may even ensure that all documents are in order and you might be coping with the rightful owner of the property. Singapore 529508 Contact Leon in OrangeTee or click here to read more if you wish to be property agent – Singapore Real Property Salesperson. Rental estate agent for condominiums, bungalows, semi-detached or public apartments in Singapore. Luxurious condo close to Somerset MRT Condominium For Sale – St Thomas Suites (D09) Singapore Contractors Affiliation Ltd Search

    Freehold Condo near Orchard The Edge on Cairnhill – Condominium For Sale One-cease service for expatriate and foreign patrons. Collection of properties for lease and for sale in Singapore. Property brokers for sale or rental of properties assisting property house owners and those searching for properties to rent or buy. Residences, homes and HDB's. Blk 138 Lorong Ah Soo, Singapore 530138. Commercial and residential property real property agents. 31 Scotts Road, Dean's Property Centre, Singapore 228225. Excessive-end apartment in singapore close to Orchard Road Condominium For Sale – Paterson Residence (D09) Property agent / real estate agent coping with leasing, rental, sale and buy of business and residential properties Meet the Manager Singapore Glass Affiliation REMAX Singapore New Launches

    Property companies embrace buy, sell or hire properties, financial planning, pattern forecasts, relocation, interior design and actual estate planning. Condominium For Lease – The Balmoral (D10) Shopping for a house is a large funding that calls for much consideration and research. The same applies for selling or renting a property, the place a lot effort and time should be spent in negotiating for supreme prices. To watch itemizing and transacted prices Our mistake was that we didn't have our personal agent. One that could have defined all this to us, why it was needed and so forth. But we still did not realise this at the moment, we just assumed that this agent (named A) was serving to us. Little did we know "A" was truly the homeowners agent and we had no 'declare' on him in any respect.

    Vendor Pays the Buyer's Dealer Commission via his itemizing agent. Underneath a Purchaser's Broker arrangement, the named brokerage and agent represent the customer. The price paid to the broker mostly is paid by the vendor. Some buyer dealer agreements include clauses that will compensate the brokerage for the price it's due less the quantity paid by the vendor. When I managed to sell a property for my shopper at double fast time and at a really good worth. The worth was higher than most models being bought at the moment. It was a lot of onerous work and naturally Luck performed an enormous part. The Consumer was very very grateful. Sellers pay a 2% commission. May be decrease for more expensive properties. CONTACTING ME We Will Achieve Your Wants And Desires In Actual Estate. Pellworm island website (in German)
  80. ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  81. ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  82. ↑ P. Derewonko and J.M. Pearce, “Optimizing Design of Household Scale Hybrid Solar Photovoltaic + Combined Heat and Power Systems for Ontario”, Photovoltaic Specialists Conference (PVSC), 2009 34th IEEE, pp.1274–1279, 7–12 June 2009.
  83. ↑ M. Mostofi, A. H. Nosrat, and J. M. Pearce, “Institutional-Scale Operational Symbiosis of Photovoltaic and Cogeneration Energy Systems” International Journal of Environmental Science and Technology 8(1), pp. 31–44, 2011. Available open access: [3]
  84. ↑ Regan Arndt and Dr. Ing Robert Puto. Basic Understanding of IEC Standard Testing For Photovoltaic Panels. Available: http://tuvamerica.com/services/photovoltaics/ArticleBasicUnderstandingPV.pdf
  85. ↑ Template:Cite web
  86. ↑ A Comparison of PV Technologies
  87. ↑ p=I⋅(1+i)+∑t=0TI⋅b(1+i)t∑t=0TE⋅(1−v)t(1+i)t
  88. ↑ What is Levelized Cost?
  89. ↑ IRENA: Renewable Power Generation Costs (German Photovoltaic System Costs: USD 2200/kW; Page 9)
  90. ↑ PV operation and maintenance costs. (PDF) . Retrieved on 2012-04-23.
  91. ↑ Solar PV warranties
  92. ↑ Understanding Solar Panel Warrantees
  93. ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  94. ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  95. ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  96. ↑ Solar Panels. Planning Portal. Retrieved on 2013-07-17.
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