Enter the annual output from your installer or a local solar model, then compare self-consumption savings with surplus sales and costs. The preset figures are examples, not current tariffs.
Estimated payback time. After 25 years, the net balance is €5,188.26.
Year-one benefit = (annual production × self-consumed share × purchase price) + (annual production × exported share × surplus price) − annual costs. Later production falls by the chosen degradation rate. Payback occurs when cumulative net benefits cover the initial cost.
This is a scenario, not a guaranteed return. Electricity prices and export contracts are held constant; financing, taxes, inverter replacement and changes in consumption are excluded. Enter an installation cost after any upfront grants. Check your contract and a location-specific production estimate.
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Each year, savings and surplus revenue are added and costs are subtracted. The cumulative total is compared with the initial investment, with interpolation within the payback year.
