UK solar calculator

Test the assumptions behind a solar quote.

Start with a sensible benchmark, then replace it with the figures from your tariff and quote.

Independent starting estimate

UK solar savings calculator

Change every assumption. This is a planning estimate, not an installer quote or funding decision.

Where is the property? Annual electricity use (kWh) Proposed system size (kWp) Installed solar price (£) Electricity import price (p/kWh) Export tariff (p/kWh) Roof direction Daytime electricity use Include a battery in the self-use estimate

Regional generation factors are deliberately conservative planning assumptions. Your roof, shading, panel layout and local weather can change the result. The import benchmark is the Ofgem Great Britain average for 1 July–30 September 2026; Northern Ireland tariffs differ.