Working through two real examples step by step.
A solar storage example
Night load of 4kWh over 12 hours with two days autonomy gives roughly 10kWh of pack.
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- How Many kWh is a 48V 200Ah Battery
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A traction example
A traction pack is sized by shift current, not by energy: current first, then amp-hours.
- How to Calculate 48V 100Ah Battery Runtime
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- How to Choose a 12V 150Ah LiFePO4 Battery from a Chinese Manufacturer？
- How to Choose a LiFePO4 12V 150Ah Battery Pack for B2B Needs？
- How Does a 60V 25Ah Ebike Lithium LiFePO4 Battery Pack Power an Efficient 1500W System
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 nominal V = Wh, divided by real load, minus 10–15% losses.
Why 12.8V instead of 12V?
Four 3.2V LFP cells in series.
What is C-rate?
Current relative to capacity — 1C on 100Ah is 100A.
Can I series different batteries?
No — same model, capacity and age.
