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Battery Bank Size Calculator

Off-grid battery bank from daily use, autonomy, and discharge depth.

Inputs

Inputs and assumptions

Kilowatt-hours per day.

Days without sun.

0.5 lead-acid, 0.8 to 0.9 lithium.

Bank voltage: 12, 24, or 48.

Amp-hours per battery.

Result

Bank amp-hours
416.7 Ah
Batteries (round up)
4.17
Nominal bank size
20.0 kWh
Screening tool. Verify against the NEC as adopted locally, the AHJ, and nameplate data before acting.

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Workspace

Keep the assumptions with the result.

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