House banks, charging sources and the failure points on a boat or a van.
House bank sizing for boats and RVs
Size from the nightly load plus the trolling motor or inverter, with a reserve for bad weather.
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Charging from alternator, solar and shore power
Each source needs the LFP profile; the alternator usually needs a DC-DC charger to survive.
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Questions
Short answers to the ones that come up most.
How big should an RV bank be?
Add the nightly loads, decide the solar contribution, and keep a reserve — then round up.
Can I charge from the alternator?
Through a DC-DC charger or a lithium-aware regulator, yes.
What fails first on a boat?
Terminals and water ingress, not the cells.
