Cuppa always the literary genius, couldn't have said it better myself suck suck grovel grovel
I have 240Ah in the van, charged with a DC/DC charger while on the road, can connect solar to it if I want (same charger) and then if I really need to, kick the genny in the guts and stick the 25A charger on it. Did you see the pic TD :P
Ultimately it comes down to what you connect up. I use a CPAP so that takes 20-30Ah (amp hours) out a day (or night) or even more if i have a nanna nap
So for me at 240Ah & CPAP & lights I could squeeze 3 nights out before I hit 50% charge and need to charge (Assuming batteries were at 100% at the start). 5-6 nights with 120w portable solar panels charging during the day. If the batteries were at 80% then I lose a night
As far as what/how many batteries it comes down to what you run off them, for how long and how long you want to go before charging.
The other thing is what space you have and type of battery. I have sealed AGM in the van and can lay them on their sides if need be. I don't know where you are but guys like Batteries Direct deliver to most places I think so don't limit yourself if you can avoid it.
Just remember what Cuppa said, there's total capacity then there's usable.
This might help http://www.fridge-and-solar.net/agm.htm
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