Direct Gov Explains Solar PV;
Solar photovoltaic (PV) systems are often known as solar panels, and use energy from the sun to create electricity. PV requires only daylight, rather than direct sunlight, to generate electricity.
How does it work?
When light shines on a solar panel, it creates an electric field across layers of silicon in the cell, causing electricity to flow. The greater the intensity of the light, the greater the flow of electricity is. Power can be used straight away or linked back into the power grid.
What’s involved?
You can use PV systems for a building with a roof or wall that faces within 90 degrees of south, as long as no other buildings or large trees overshadow it. If the roof surface is in shadow for parts of the day, less electricity will be produced.
Solar panels are not light and the roof must be strong enough to take their weight, especially if the panels are placed on top of existing tiles.
Solar panels come in a variety of shapes and colours, including:
• grey 'solar tiles' that look like roof tiles
• transparent panels that you can use on conservatories or glass to provide shading as well as generate electricity
Planning permission
You may have to get planning permission to fit a PV system, especially in conservation areas or on listed buildings. Always check with your local authority about planning issues before you have a system installed. Obtaining planning permission after the system is in place can be difficult and expensive.
How much does it cost?
For the average domestic system, costs are around £5,000 to £8,000 per kilowatt (kW) including installation. Most domestic systems are between 1.5 and 3kW and can produce around half a domestic property’s electricity requirements.
Solar tiles cost more than conventional panels, and panels that are integrated into a roof are more expensive than those that sit on top. If you intend to have major roof repairs carried out, it may be worth considering PV tiles, as they can offset the cost of roof tiles.
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