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Size the battery before the battery fails
Most premature battery failures are sizing failures — a bank chosen by guesswork, discharged deeper and harder than its design. This calculator applies the duty-cycle method our own engineers use, with every correction shown line by line.
- 1 · Motive power — forklifts, mining locomotives, RGVs/AGVs, boom lifts, cranes: full travel-cycle method, or simply average current × hours → required capacity at the 5-hour rate. Flooded tubular traction (gel where watering is impossible).
- 2 · Solar — flooded OPzS and gel OPzV: daily load, autonomy days, daily-cycling limit → required bank with the governing constraint named.
- 3 · UPS / Standby — flooded, gel and AGM: load, backup minutes or hours, temperature → required capacity at your duty’s own rate. Also serves telecom DC plants, substation control DC and inverter banks.
- An audit trail, not a black box — every factor (depth of discharge, temperature, aging, design margin) is visible and adjustable, IEEE-practice margins throughout.
Method: Dr. Michael McDonagh, Microtex Energy — margins per IEEE Std 485 / 1013 recommended practice.
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