lc0338 wrote:
Need to know what you plan to do in your RV? If you will be hooked up to electric in a campground all the time then 2 12 volts is cheapest route.
If you plan to boondock and not be hooked up to campground electric then 2 6volt batteries are best because you can usually get more Amp hours (AH) in 6 volt batteries.
Then you will have to determine if you want wet cell or AGM? If you are lazy like me and don't want to have to worry about putting water in them then buy AGM type. If you don't mind maintaining the batteries then wet cell will be a little less cost. Another perk with AGM is there will be no corrosion on the cables and battery terminals :)
I mostly plan to be at a campground connected to shore power. But I would like my fridge to be able to run while going down the road.