Solar panel electricity systems capture the sun's energy using photovoltaic (PV) cells which are made from layers of semi-conducting material, usually silicon, and convert the sunlight into electricity. The stronger the sunshine, the more electricity is produced, but the cells can still generate some electricity on a cloudy day.
PV cells come in a variety of shapes and sizes, most of which are made up of panels that fit on top of an existing roof.
As the power of the sun is free, once you've paid for the installation of your system, the electricity it generates is free, although you still need to pay for any additional electricity you use from the grid and maintenance costs. Some installation companies will also offer additional servicing packages to ensure your system keeps running safely and efficiently.
Solar panels for home
The cost of solar panels has plummeted in the last ten years due to advancements in technology but the cost of the solar panel system you need for your property will depend on its size and power needs.
According to the Energy Saving Trust, the average domestic solar PV system costs around £5,500 to install and can generate between 3,400 – 4,200 kilowatt hours of electricity a year. Savings could be greater if you can align your energy use with the times that power is generated.
Solar panels for business
The most popular systems for businesses have a 5 – 9kW output for small offices costing around £8,000 but a larger commercial operation such as a factory may need a system with an output of 25kW – 200kW and cost significantly more.
Use the Energy Saving Trust solar energy calculator to find out whether a solar panel system is suitable for your home or business.
Next steps on your solar power journey
Here's where to go for more advice on installing solar panels at your home or business.