Assumes a typical £90/month electricity bill (about 4,100 kWh a year), 26.32p/kWh import (Ofgem price cap, Q4 2026) and 6p/kWh SEG export. Generation uses PVGIS regional sun hours, which are net generation figures (kWh per kWp) and already include system losses.
Calculator by uksolarcalc.co.uk — free UK solar calculators · Estimates only, not financial advice.