Why 100Ah, 200Ah and 51.2V are everywhere, and when to deviate.
Where the common sizes come from
Cell formats and inverter inputs produced a handful of standard sizes; they are a convenience, not a requirement.
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When a custom size is justified
Custom sizes are worth it when space or weight is binding, not for small cost savings.
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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.
