Sizing for High-Drain Loads

Motors, inverters and anything that starts with a surge.

Ask a technical question

Motors, inverters and anything that starts with a surge.

Surge current and the BMS limit

Size for the surge, or the BMS trips at the worst possible moment.

Cable, contactor and pre-charge

High-drain systems need the copper and the pre-charge to match.

Voltage & sizing questions

Short answers to the ones that come up most.

How do I choose a voltage?

Set by the equipment — 12V small loads, 24V light traction, 48V storage and traction.

How do I work out runtime?

Ah x V = Wh, divided by the real load, minus losses.

Why 12.8V?

Four 3.2V LFP cells in series.

What is C-rate?

Current relative to capacity.

Series different batteries?

No — same model, capacity and age.

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