Solar + home charging payback

Rough years-to-repay if solar kWh displace home or public EV charging.

Example maths using our EV-night electricity default (6.66p/kWh EDF GoElectric example) and public rapid (82p Zapmap). Panel/battery quotes are yours — we do not invent £/kWp. Independent fan site.

Inputs

System cost (after any grant)£ Annual generation used for EV chargingkWh/yr Avoided home tariffp/kWh Or compare vs public rapidp/kWh

Payback

Savings = kWh used for the car × avoided p/kWh. Years = system cost ÷ annual £ savings. Export payments, standing charges and degradation are ignored.

Wallbox payback · Running costs

Sources

EDF GoElectric night example 6.66p/kWh (running-costs defaults)
Zapmap Price Index rapid example 82p/kWh
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