2 Camper Batteries 12V or 6V

EK wrote:
Ok I have heard this so many times and now I figured I would get more opinions!
I was told by 3 different RV stores/ Shops that putting 2- 6Volt batteries in Series will give me more Amp Hours than 2- 12Volt batteries in Parallel.

They are mostly correct.. The problem (Reason for Mostly) is this:
When we speak of two six volt in series we are normally speaking of GC-2 which are around 220 Amp Hours And they are DEEP CYCLE which means you can use half of that before serious damage happens.

Here are some numbrs
GC-2 Pair, as noted around 220 amp hours

Group 24 about 75 AH each, or 150 for a pair
Group 27 About 95 each 190 for a pair
Group 29 About 105 each 210 for the pair

Group 31 (Harder to find) 130 amp hours 260 for the pair

Now.. All the abov Group XX batteris are usually MARINE/deep cycle (note case) these are primarly starting batteries and if you run them down to half full serious damage is alrady happening.. Try to keep them 75% (im not sure of the actual minimum state of charge) if you can.. But as you can see all cases,, limiting to 75% you have less amp hours.

Now the kicker

You can also get really big batteris, like the 4D or 8D,, these can be found in Deep Cycle if you ask... They are in the 220-230 amp hour range.. EACH.

Finally on a bang for your buck (Amp hours/Dollar) GC-2.. kind of hard to beat,, You see they are very popular.. Unlike 12 volt types whr we have .. Well... I mentioned six different sizes.. There are only 2 or 3 GC-2 class batteries. Purchasd by the pallet load by Golf Courss (GC=Golf CAR) from coast to coast they sell more of these than any other lead acid battery.. Makes for lower cost per unit and savings for you.