Solar Battery ROI Calculator
6 inputs → your battery-specific payback period
How Solar Battery Payback Is Calculated
Without storage, bill savings generally depend on electricity used while the system produces. Exported energy may receive different treatment depending on the meter, tariff, utility, and applicable rules. A compatible battery may shift some energy to a later period, subject to its capacity, losses, controls, and operating limits.
Wattage and base cost (Questions 2–3) set your system's raw production, using the same state-specific peak-sun-hour and 85% system-loss model as our Payback Calculator.
Battery capacity and price (Question 4) are illustrative presets. The formula limits the modeled shift according to capacity relative to daily generation; it does not model a specific battery's round-trip efficiency, standby use, warranty, control behavior, or usable capacity.
Time-of-use pricing (Question 5) applies a fixed 15% model boost when “yes” is selected. It does not reproduce an actual tariff or hourly dispatch.
Home occupancy (Question 6) selects fixed before-and-after self-consumption factors. These are scenario assumptions, not measured household load profiles.
Is a Solar Battery Worth It?
The answer depends on the price, usable capacity, efficiency, warranty, compatible equipment, load timing, electricity tariff, export treatment, and expected operating life. Use the result as a scenario comparison and obtain current product specifications and pricing before deciding.
Sources and assumptions: Prices, capacities, self-consumption factors, sun hours, and the time-of-use boost are fixed calculator inputs rather than live product or tariff data. See Methodology & Sources.