Solar Battery Savings Calculator
Calculate shifted solar energy, annual savings and simple battery payback from your generation, self-consumption and tariff inputs.
This constant-year comparison uses your inputs only. Generation is 0–1,000,000,000 kWh/year; percentages are 0–100%; rates are 0–1,000,000 per kWh; cost is 0–1,000,000,000,000. Round-trip losses, degradation and fixed charges are not modeled separately; include their effects in your inputs if needed. A positive saving is not a guarantee of battery performance or investment returns.
ΔE = G × (S₁ − S₀)/100; A = ΔE × (Rᵢ − Rₑ); T = C/A (A > 0)
Inputs stay in this browser. Rates and cost must use one currency. Energy and years show up to 6 decimal places; money shows 2.
Results
- Shifted solar energy (kWh/year)
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- Annual savings (currency/year)
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- Simple payback (years)
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A QUICK WALKTHROUGH
How to use this tool
- Enter annual generation and the two self-consumption percentages.
- Enter import and export rates and battery cost in one currency.
- Calculate and read the assumptions with the result.
Formula and limits
This constant-year comparison uses your inputs only. Generation is 0–1,000,000,000 kWh/year; percentages are 0–100%; rates are 0–1,000,000 per kWh; cost is 0–1,000,000,000,000. Round-trip losses, degradation and fixed charges are not modeled separately; include their effects in your inputs if needed. A positive saving is not a guarantee of battery performance or investment returns. ΔE = G × (S₁ − S₀)/100; A = ΔE × (Rᵢ − Rₑ); T = C/A (A > 0)
Local processing
Inputs stay in this browser. Rates and cost must use one currency. Energy and years show up to 6 decimal places; money shows 2.
GOOD TO KNOW
Common questions
What happens when savings are not positive?
Shifted energy and annual savings are still shown, but simple payback is unavailable. The model does not divide by zero or negative savings.