CEG calculator

Solar savings calculator CEG

Example energy price €0.30/kWh, editable.

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Savings and payback

Your cost, yield and bill price.

Enter numbers without thousands separators: write 3000. Results use English formatting, for example 3,000 W and 3.5 kW.

Kit cost

The amount you are considering, VAT included if you pay it.

Unit: €

Yearly yield

Estimated kWh in one year. You can take it from the monthly yield tool.

Unit: kWh/year

Self-consumption

Share of produced energy used at home, directly or from the battery. 70% is a starting point with storage.

Unit: %

Energy price

Only the avoidable variable charge for each kWh you no longer take from the grid. Do not include fixed charges or contracted power. Example value: use the variable price from your bill.

Unit: €/kWh

Assumptions: yearly saving = self-consumed energy only × avoidable variable price. Payback years = kit cost ÷ that saving. Standing charges, contracted power, incentives, net metering, inflation and maintenance are not counted.

Understand this estimate

Annual savings = generation × self-consumption fraction × avoided unit price. Simple payback = cost ÷ savings. Fixed bill charges, financing, maintenance, degradation, incentives and export revenue are excluded.

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