Solar Panel Calculator UK

This solar panel calculator helps UK homeowners work out the right system size and estimated cost before speaking to an installer. Enter your annual electricity usage (in kWh — check a recent bill), your roof orientation, and your postcode area. The calculator uses UK average installation costs combined with location-adjusted peak sun-hour figures (derived from UK regional irradiance data) to estimate annual generation and payback period.

Results are estimates based on typical UK conditions. Actual output depends on shading, roof pitch, panel brand, and installer workmanship. Use these figures as a starting point — an MCS-certified installer will carry out a detailed site survey before quoting.