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How do Solar PV Cells work?
Photovoltaic (PV) cells convert radiation from the sun into electricity. A typical PV cell consists of a wafer of semi-conducting material, usually silicon, manufactured with two electrically different layers. When sunlight hits the cell it excites the electrons within the silicon, creating an electric field across the layers and causing a flow of electricity.

How much electricity do solar PV systems generate?
Cornwall and Devon generally have the potential for the highest performance returns nationally. A correctly designed and installed system optimally orientated, un-shaded 2kWp array will generate approximately 1700kWh of electricity per annum as a national average.

How do I earn money from my own roof?
Feed-in Tariffs (FITs) became available in Great Britain on 1st April 2010. (excl' NI at present). Under this scheme energy suppliers have to make regular payments to householders and communities who generate their own electricity from renewable or low carbon sources such as solar electricity panels(PV).

What size do Solar PV Panels come in?
PV systems are modular, allowing a great degree of flexibility in design and specification. In practice, the size of a system is often determined by the available roof space or the energy requirement of the property. A standard 4kWp PV array will occupy at least 24m˛ of roof.

Where can I place my Solar PV Panels?
Solar PV is generally a permitted development right on or within the curtilage of your dwelling, however, local restrictions may apply and should be investigated. PV arrays can be mounted in a range of locations but the roof of a building usually provides the best and simplest site. Ground mounted installations are available if your roof is unsuitable, utilising either ballast or specially designed mounting frames. Most importantly, Solar PV panels should be located in a south-facing, un-shaded location.

Why is shade a problem for Solar PV systems?
Any shade factors neglected in the design of an Array, such as from trees or neighbouring buildings can have a considerable impact on the performance of a PV system. Because panels are fabricated from a number of cells connected together; as little as 2 ˝ % constant shading of a panel can reduce the efficiency and lifespan of the whole module over time. To work effectively Solen Energy UK recommends that whole PV array needs to be free from shade for the majority of the day.

What is the difference between Monocrystalline cells and Polycrystalline cells?
There are several types of PV cell. Monocrystalline cells are made from a single large crystal of silicon - they generally are more efficient and slightly better in low light conditions but they can be more expensive. Polycrystalline wafers/cells are cut from a block that contains many small crystals and are slightly less efficient than Monocrystalline cells which are cut from one crystalline ingot. In practice, for a typical residential property, there is little difference in the performance of these different products.

My roof is old and in fairly poor condition – can I still install a Solar PV system on it?
Solen Energy UK assess the roof covering and structure of the roof, however we would always recommend that if any doubts are raised an independent structural engineer should be consulted. PV systems are not normally heavy enough to cause structural problems when designed correctly and wind loads are factored into the equation. If your roof is in need of repair or replacement we would recommend combining this work with your PV installation as this will help to reduce cost.

I have no access to my loft – will that be a problem?
The reason why the installers need access to the loft is because this is usually where the Inverter is installed. The inverter generates a lot of heat whilst in operation so the loft is the perfect place to put it as it offers sufficient ventilation to distribute the heat. Inverters should not be kept in a cupboard or enclosed space as this creates a fire risk. If you do not have access to your loft, you will need to think about where else within your property this inverter can be placed that is close to the roof and in a well ventilated area.

What is the life expectancy of a Solar PV system?
All of our panels for projects of less than 50kW are accredited under the MCS/BRE assessment criteria. All panels come with a minimum 5 year physical warranty and 25 year performance guarantee. The inverters generally have a 5 year guarantee and are upgradeable for a. All system components should last considerably longer and with over 6 year’s system design and monitoring of MW systems in Europe, Solen Energy has selected key product partners. All of our installers and partners offer a minimum 5 year workmanship warranty on all installations.

Can I sell the electricity I generate from my Solar PV system?
Under the government Feed-in-Tariff (FIT) you get paid for all the units that you generate, even if consumed onsite. There is a deemed export on most domestic systems where you will receive a further 3.1p for 50% of the generated electricity.

I am worried about the future Feed in Tariff changes!
The Feed in Tariff is guaranteed for 25 years from the date which you register and qualify. The changes under current review are for larger projects in excess of 50kWp which will not affect Domestic, Agricultural and Commercial applications. The next natural review will be before March 2012. There will be plenty of notice before any amendment dates take effect.