Solar Panel Savings Calculator

What a solar system saves each year, when it pays for itself and what it returns over its life.

System size kW

Average sun hours per day hours

Peak sun hours, not daylight hours. Between 2 and 3 in northern Europe, 5 or more in sunny regions.

Performance ratio

The share of the theoretical output that reaches your meter.

Installed cost of the system

Price you pay per kWh

Export price per kWh

What the grid pays you for electricity you do not use. Often much lower than the retail price.

Share of generation used at home

Rises with a battery, an electric car or daytime hot water.

Expected life of the system years

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Free calculator by Calculators worked examples and methodology No account, nothing stored.