Sizing Principles

How to move from a load list to a pack specification.

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How to move from a load list to a pack specification.

From load to energy to cells

Convert the load to kWh, add autonomy and losses, then divide by usable cell energy.

Margins, temperature and ageing

Add margin for the worst month and for the capacity you will lose over ten years.

LiFePO4 questions

Short answers to the ones that come up most.

What makes LiFePO4 different?

Lower energy density than NMC, far better thermal stability and cycle life.

How long does a pack last?

4,000–6,000 cycles at 80% DOD.

Can it be charged in the cold?

Not below 0°C without a heater.

Does it need maintenance?

No watering, no equalising — terminals, ventilation, BMS log.

Is it safe?

The safest lithium chemistry in wide use.

Back to Charging & BMS · All Redway guides

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