Estimate solar battery payback using installed cost, usable capacity, daily cycling, import price, export rate, and maintenance.
Formula
const spread = Math.max(0, inputs.grid_price-inputs.export_rate); const annual_savings = inputs.usable_kwh * inputs.daily_cycles * 365 * spread - inputs.maintenance; const payback_years = annual_savings>0 ? inputs.installed_cost/annual_savings : 0; const ten_year_value = annual_savings*10 - inputs.installed_cost; return { annual_savings: Math.round(annual_savings), payback_years: Math.round(payback_years*10)/10, ten_year_value: Math.round(ten_year_value) };Installed Battery Cost
12,000
Usable Battery Capacity (kWh)
10
Average Daily Cycles
0.8
Grid Electricity Price per kWh
0.32
Solar Export Rate per kWh
0.08
Annual Maintenance / Degradation Cost
100
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This solar battery payback calculator estimates annual savings, payback period, and 10-year net value from installed battery cost, usable capacity, daily cycling, import price, export rate, and maintenance. Use it to check whether a battery quote is financially justified or mainly a resilience purchase.
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The estimate combines Installed Battery Cost, Usable Battery Capacity (kWh), Average Daily Cycles and returns Annual Savings, Payback Period, 10-Year Net Value.
If the result changes your decision, verify the current quote, rate, eligibility rule, or provider term before acting.
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