Solar PV Calculator
Enter the system size, electricity export and your region to estimate your annual savings and earnings. Domestic systems are typically between 1 kWp and 4 kWp in size which requires a roof area of 8 to 32 square metres. Feed-in Tariff payments assume that you will export 50% of your generated electricity so if you use it all, you make more money.
Our Solar PV calculator assumes that the roof faces South; the pitch of the roof is 30 degrees; there is no shading by buildings, trees, etc. and the average cost of electricity is 14.4p per kWh.
Note that other roof directions, pitches and panels that are partially shaded can still produce an excellent return on investment. Our Installer's surveyors will be able to give you more accurate figures based on the actual circumstances.