Free calculator

How Much Could You Save?

Enter your details below for a personalised estimate based on UK irradiance data and current Ofgem rates.

Used to fetch real solar data for your exact location from the EU PVGIS database.
Ofgem April 2026 price cap: ~24.5p/kWh. Check your bill for your exact rate.
Typical 800W kit: £400–£900.
Location —
Annual solar generation — kWh
Annual bill saving —
Payback period —
10-year net saving —

Generation data sourced from PVGIS (EU Joint Research Centre) using satellite-measured irradiance for your postcode. Savings assume 80% self-consumption. This is an estimate, not financial advice.

How it works

This calculator queries PVGIS — the EU Joint Research Centre's satellite-based solar database — using your actual postcode coordinates. It's the same data source used by solar installers and energy researchers across Europe.

It uses a performance ratio of 75% — accounting for inverter losses, temperature, and soiling — and assumes 80% self-consumption of generated electricity.

Your postcode is converted to coordinates using the free postcodes.io API. Nothing is stored or tracked.

Read the full savings guide →