Solar Payback Calculator (Cornwall)
Get an instant 2026 payback estimate for solar panels at your Cornwall property. Based on Cornwall's solar irradiance of 1,298 kWh/m²/year — 19% above the UK average — and current electricity prices.
How this calculator works
Cornwall receives ~1,298 kWh/m²/year of solar irradiance — 19% above the UK average. We assume a panel performance ratio of 0.84, your selected orientation factor, current Q2 2026 electricity unit rate of 24.67p/kWh, SEG export rate of 16p/kWh, and self-consumption of 35% (no battery), 75% (9.5kWh battery) or 85% (13.5kWh battery). System pricing reflects 0% VAT (until March 2027) and includes installation, scaffolding, MCS certification and DNO notification.