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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
—
Batteries (round up)
—
Nominal bank size
—

What to check

  • Daily kWh
  • Autonomy days
  • Battery voltage and amp-hours

Related calculators

Screening tool. Verify against the NEC as adopted locally, the AHJ, and nameplate data before acting.

Saved calculations

Keep the assumptions with the result.

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