EuroWattCalc
Solar PV tool

Solar savings calculator

Estimate what generated electricity may be worth when part is used at home and the rest is exported.

Annual value estimate

Use a solar-generation estimate for your roof and local conditions.

Used at home—kWh/year
Exported—kWh/year
Estimated annual value—bill saving + export
Monthly equivalent—annual value ÷ 12

What self-consumption means

Self-consumed solar is electricity generated by your system and used in the building rather than exported. Each self-consumed kWh can avoid buying roughly one kWh at your import tariff, subject to the way your tariff is structured.

What this calculator does not model

It does not model financing, panel degradation, maintenance, taxes, battery losses or hour-by-hour tariff changes. It is a simple annual-value estimate designed for first-pass comparisons.