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LiFePO4 battery autonomy calculator CEG

Estimate battery runtime without recharging from nominal kWh and 24-hour consumption. Preliminary model with stated assumptions.

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How many days can the battery last?

Reserve, efficiency and initial charge

Same assumptions as battery sizing: 90% usable capacity and 95% efficiency are editable examples. No recharging during the period. Starting at 100%, 16 kWh and 8 kWh/day give 1.71 theoretical days.

Method and limitations

Autonomy = initial energy above reserve × efficiency ÷ 24-hour demand. This estimates no-recharge duration; power, temperature, ageing and surges remain to be checked.

All calculators · The same check in the full guide (Italian)