Solar Payback Calculator UK
Estimate how long solar panels may take to pay back in the UK from installation cost, annual generation, self-use, import price and export tariff assumptions.
Annual value = self-used generation x import price + exported generation x export price.
What this does not include
This simple payback does not include inverter replacement, finance interest, maintenance, roof work, shading or future tariff changes.
Why export rates matter
When export rates are low, using more electricity at home is usually more valuable than sending it back to the grid.
Solar with battery storage
A battery can increase self-use, but it also adds cost. Check the plain solar estimate first, then compare it with the battery storage payback calculator.
Electricity use matters
Homes with daytime electricity use, EV charging or flexible appliances may be able to use more solar generation directly. Estimate individual appliances with the electricity cost calculator or compare car charging with the EV charging cost calculator.
Solar payback FAQ
What is simple solar payback?
Simple payback divides installation cost by estimated annual value. It does not include finance, maintenance or future tariff changes.
Why does self-use matter?
Electricity you use at home usually saves more than electricity exported to the grid, so self-use can strongly affect payback.
How do I calculate solar panel payback?
Estimate the annual value of self-used electricity plus exported electricity, then divide the installation cost by that annual value.
Is this a full solar quote?
No. It is a simple solar calculator for payback planning. Roof condition, shading, inverter replacement, finance and installer quotes still matter.