Engineering calculator

Battery bank sizing

Estimate the usable battery bank capacity and the number of batteries required for your off-grid daily energy demand.

Daily energy demand (Wh)System voltageOff-grid autonomy (days)Usable depth of dischargeBattery capacity (Ah)Battery nominal voltage (V)Batteries currently configuredLow-temperature capacity factor

Estimated battery bank

Required bank capacity

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Recommended battery count

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Configured bank

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Usable stored energy

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Result: —

Safety note: Battery BMS limits, charge current, temperature protection, parallel-battery wiring and manufacturer installation instructions must be checked before installation.

Safety and limitations

This tool provides planning estimates only. It is not a substitute for a qualified design, inspection or local code compliance.
Use the exact manufacturer documentation for the equipment, materials, limits and installation method you intend to use. Do not select hardware from the result alone.
Verify every input, unit, operating condition, environmental limit and installation derating before relying on the result.
Protection devices, emergency controls and final commissioning must follow the manufacturer’s instructions and applicable local standards.
Electrical, gas, fuel, towing, structural and fire-safety work must be reviewed or completed by a suitably qualified professional where required.
This result does not include local approval, exact product compatibility, site-specific conditions, fault studies or commissioning measurements.

If any input is unknown, stop and obtain the datasheet or professional verification before purchasing or wiring components.

Results are planning estimates, not a substitute for a qualified electrical design or the manufacturer’s installation instructions.