Home, building & household
Calculation method and formula
annual self-consumption savings + feed-in revenue − maintenance
Understand the inputs
- Solar system
- Unit: €. Minimum 0. Use a measured value or your own assumption.
- Installation/extra costs
- Unit: €. Minimum 0. Use a measured value or your own assumption.
- Battery cost
- Unit: €. Minimum 0. Use a measured value or your own assumption.
- Subsidy
- Unit: €. Minimum 0. Use a measured value or your own assumption.
- Annual generation
- Unit: kWh. Minimum 1. Use a measured value or your own assumption.
- Annual electricity use
- Unit: kWh. Minimum 1. Use a measured value or your own assumption.
- Self-consumption share
- Unit: %. Minimum 0. Maximum 100. Whole number.
- Electricity price
- Unit: €/kWh. Minimum 0. Use a measured value or your own assumption.
- Feed-in tariff
- Unit: €/kWh. Minimum 0. Use a measured value or your own assumption.
- Annual maintenance
- Unit: €. Minimum 0. Use a measured value or your own assumption.
- Electricity price increase/year
- Unit: %. Minimum 0. Maximum 20. Use a measured value or your own assumption.
- Annual degradation
- Unit: %. Minimum 0. Maximum 10. Use a measured value or your own assumption.
Assumptions and limitations
Self-use is limited by generation and consumption. Yield, electricity-price growth and degradation are assumptions. Financing, taxes and replacement costs are not automatically fully modeled.
The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.