Yep, I have 3 x 85Ah leisure batteries in my van, and don't need charge them at all over a 3 day racing weekend. Charging, lighting, bits and bobs all fine and dandy.
I've hardly used my generator as a result, it's almost pointless, especially as in an emergency one can just borrow a bit o power.
So a 120Ah for just charging will be plenty.
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