Battery Capacity Calculator (Vans)
Size your van’s battery bank from daily Wh, autonomy days, system voltage, and allowed DoD. Get required Ah and a practical module S×P configuration.
Is Wh/day affected by system voltage?
No. Wh/day is independent of V. Ah changes with V via Ah = Wh / V.
How much headroom should I add?
10–30% is common to cover colder temps, aging, and future devices.
Can I mix different battery sizes or chemistries?
Not recommended. Keep modules identical, same age/brand if possible.
What DoD should I use?
LiFePO₄: 80–90% typical. AGM: ~50% to preserve life.