Solar Storage Battery Cycle Calculator

At the datasheet rating point, LiFePO₄ cells of this class are typically rated around the default shown (to 80% remaining capacity). Cycle at a shallower depth of discharge and the count rises steeply — that is the (DoD_rated/DoD)^k term. Heat, fast charging and storage at full charge all shorten it.

Whichever you reach first, and at one cycle/day the calendar usually wins (10 years ≈ 3,650 cycles). Warranties also specify minimum remaining capacity (commonly 70%) and energy-throughput caps — check yours for an MWh limit, which is the EFC concept this calculator uses. Keeping average SoC moderate and the battery cool puts the calendar limit, not the cycle limit, in charge — exactly what you want.

Count equivalent full cycles: two 50% discharges ≈ one full cycle of energy throughput. If your charger or BMS reports total Ah or kWh throughput, divide by the pack's rated capacity to get equivalent full cycles — that is the number to enter as cycles completed.

Industry convention is 80% of original capacity — beyond that, fade accelerates and runtime becomes unpredictable. Fleets usually retire packs at 80% for the duty they were bought for, then cascade them to lighter duty rather than scrapping immediately.

Yes — it is the single biggest lever you control. Lead-acid cycled to 50% instead of 80% roughly doubles cycle count; lithium chemistries gain similarly with the exponent k shown in the formula. Sizing a pack so daily use is a shallower fraction of capacity is usually cheaper than replacing packs early.