Free estimate
Savings Calculator
Your roof and your bill in; the system, the saving and the payback out.
Your saving a year
£942
A 4.84 kWp system of 11 modules: the roof is full
Pays For Itself7.1 years
Over 25 Years£24,956
System4.84 kWp11 modules of 440 W
Roof Used21.4 m²The roof is full
Makes A Year4,888 kWh45% used at home
Your Bill£61 a monthDown from £140
Installed Price£7,1660% VAT, fitted
Carbon Saved1.0 tEvery year
Your Year, Month By Month
JanFebMarAprMayJunJulAugSepOctNovDec
Made by the roof (kWh)Used by the home (kWh)
Ways To Pay For It
- Pay Outright£7,166Nothing a monthSaves £79 a month from day one
- Green LoanNo deposit£83 a month for 10 yearsAt 6.9% APR: £4 a month more than it saves
- Pay Per kWhNothing upfront14p a kWh you useSaves £19 a month for 20 years
How we work it out
The Sums Behind The Figures
The same engine sizes every quote our designers send; the survey then replaces the guesses with your roof's real measurements.
About 70% of a roof can carry modules; each 440 W module covers 1.95 m². A 32 m² roof takes 11 modules; the survey measures the real roof.
Installed price is £1,150 per kWp plus £1,600 for scaffold, inverter and commissioning, with 0% VAT. Our Family package (12 modules and a 5 kWh battery) is £10,570.
A typical home here pays a system back in about 7.1 years; the calculator works it out from your own roof and bill.
Yes, at a lower output: modules turn daylight, not heat, into power. Our live output in the top bar shows a Bristol roof right now.