Solar Savings
Calculate annual solar savings from self-consumption and grid export
Get this from your inverter portal or PVGIS
Typically 25–50% for households
Example price
Example — depends on your contract
For payback period calculation
Annual savings
Example prices — enter your actual prices.
How does it work?
Solar savings come from two sources:
- Self-consumption: solar electricity you use directly — saves the import price.
- Grid export: surplus electricity sold to the grid — earns export compensation.
Typical household self-consumption ratio is 25–40% without a battery, rising to 60–80% with battery storage.
Get your annual generation figure from your inverter portal (SolarEdge, Fronius, SMA) or estimate from PVGIS (free EU solar estimation tool at ec.europa.eu/jrc/en/pvgis).
All prices shown are examples. Enter your actual import and export rates from your energy contract.
Example
Example: 4 kWp system, 3500 kWh/year generation, 35% self-consumption.
Self-used: 3500 × 0.35 = 1225 kWh
Exported: 3500 × 0.65 = 2275 kWh
Import savings: 1225 × 0.18 = €220.50 (example)
Export earnings: 2275 × 0.08 = €182 (example)
Total: €402.50/year | System cost €5000: payback ≈ 12.4 years
Assumptions
- •Annual generation is provided by the user — calculator does not model solar irradiance
- •Prices are examples — enter actual import and export rates from your energy contract
- •Self-consumption ratio is an annual average — varies by time of day and season
- •Simple payback does not account for inflation or maintenance costs