Frequently Asked Questions

We have tried to answer a few of the most commonly asked questions here. If you're question is not covered here please contact us and we will do our best to answer your query.

 

 

Does solar power work in the UK?
Yes it does. PV cells do not need direct sunlight in order to work. It is true that more electricity will be generated on bright sunny days; however a PV system will generate electricity even on cloudy days.

Solar thermal systems will supply hot water throughout the year, contributing to, on average, about 60% of annual hot water demand.

What's the difference between solar thermal and solar photovoltaic?
Solar thermal uses solar panels to heat water whereas a solar photovoltaic (PV) system produces electricity from sunlight.

What's the difference between grid connected and stand alone systems?
Grid connected means that the PV system is connected to the mains supply usually within a building. The electricity produced is either used within the building or is exported to the National Grid.

A Stand Alone system on the other hand produces electricity that is usually stored in one or more batteries. The electricity is then used as and when required with the PV module constantly re-charging the battery.  

How much electricity will a PV system produce?
In the UK a typical Solar PV system, if installed at the optimum inclination and south facing should produce on average between 750kWh - 800kWh per kWp of installed capacity. So a 2kWp system should produce between 1500kWh and 1600kWh of electricity. See our energy equivalents page.

How much does it cost?
A typical system, designed and installed will cost somewhere between £4000 and £9,000 per kWp. The price will vary depending on the building, access to the roof and the type of technology being installed.

Is my building suitable for a Solar PV system?
You will need around 10 -15m² of roof space to fit a decent sized solar PV system. Also you should have a fairly clear south facing roof which has an unobstructed view of the sun from about 9am through to 3pm from February through to October. The optimum angle of inclination will need to be around 30°. It is also important to remember that the solar PV modules will make it difficult to renew your roof. If you have an old roof it might pay to look at getting this renewed before installing a PV system.

Can I get a grant?
Grants towards the cost of installing PV are available from the DTI through the Low Carbon Buildings Programme. See our grants page for information on applying for a grant. 

Do I need planning permission for a solar PV system?
It is advisable to contact your local planning authority when thinking of installing a solar PV system on your property. Generally planning permission is not required unless the building is listed or is sited in a conservation area or in an area of outstanding natural beauty. If in any doubt, contact your local planning authority. 

What does kWp and kWh mean?
kWp or kilowatt peak refers to the size of the system. It is the maximum power the system would produce under ideal conditions.

kWh or kilowatt hour is the term given to the unit of electricity. When you pay your electricity bill the total is based on the number of kWh's you have used.