Battery Storage Payback Calculator
Estimate whether a home battery can pay back through tariff shifting or storing cheap electricity for later use.
Annual value = usable capacity x annual cycles x tariff spread x round-trip efficiency.
Cycles are not always full cycles
Real batteries may do partial cycles, and value depends on how much energy is actually shifted from low-value to high-value use.
Warranty and degradation matter
Check usable capacity, cycle warranty and degradation terms before assuming the same savings every year.
Battery storage FAQ
What is tariff spread?
Tariff spread is the difference between the price you avoid or sell at and the price you pay to charge the battery.
Does battery payback depend on cycles?
Yes. A battery that cycles more useful energy each year can capture more value, but warranty and degradation matter.