Total upfront cost including panels, inverter and mounts. Typical 800W kit: £400–£900.
Not sure? The savings calculator gives an exact figure for your postcode.
Ofgem price cap, 1 October–31 December 2026: 26.32p/kWh. Check your bill for your exact rate.
The share of generation you actually use (rather than export for little/no payment).
Electricity used from solar— kWh/year
Annual bill saving—
Payback period—
10-year net return—
20-year net return—
Assumes electricity prices stay flat (in reality they usually rise, which shortens payback) and panels keep working for 20+ years. This is an estimate, not financial advice.