This might not be the most correct answer, and I do not want to go into the minutae of hows and whys for a charging system; my buddy David from Earmark can guide you QUITE specifically based on what you think your needs are....

I use two LARGE group 29 marine batteris from Wal Mart, with a Blue Sea 7650 ACR wired in per manufacturer's specs, wtih no battery switch.

So far, no worries on my system.

Now, beyond my very general recommendation....
Get with David; he is a real good one to talk to to get a real good recommendation based on your needs, and he has teh stuff you will need to do it. Hopefully he posts up soon; he is good about responding here.

Phil
Kicker