Battery Payback Calculator
Enter your solar panel size, yearly consumption, and battery details to see estimated savings and payback period.
Yearly Savings
β¬383
Monthly Savings
β¬32
Payback Period
13.0 years
Your Setup
Battery Configuration
Estimated Savings
Yearly Savings
β¬383
Monthly Savings
β¬32
Payback Period
13.0y
1722 kWh
1080 kWh
1541 kWh
1249 kWh
This calculator uses average Estonian Nord Pool prices (Mar 2025βMar 2026) and typical consumption/solar production profiles. For personalized results based on your actual 15-minute interval data, connect your Elering account in the dashboard.
How we calculate
The simulation runs through 13 months of 15-minute interval data. Solar excess charges the battery for free when spot price is below the daily median β when price is high, solar exports directly to avoid efficiency losses. During expensive peak hours (above daily median), the battery self-consumes to offset your usage (saving the full all-in price) and may sell to the grid if the spot price is at least 3Γ the day's cheapest spot price. On cloudy/winter days, the battery charges from the grid at cheap off-peak rates, but only when the expected peak all-in price Γ efficiency exceeds the charge cost. Grid selling earns only the electricity spot price (no grid fees), while buying costs the full all-in price (spot + grid + fees + VAT), so grid arbitrage requires large price swings to be profitable.
Start saving on your electricity bill
Create a free Elewatt account to set up smart schedules for your devices, track your consumption, and see personalized savings based on your actual electricity data.
Frequently Asked Questions
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