2 x 12 volts or 2 x 6 volts batteries?

You want the 2 6 volt batteries.

The reason is that the vast majority of 6 Volt batts on the market are deep cycle. The vast majority of 12 volt are not (and would be much costlier, larger, and heavier to be correctly called 'Deep Cycle').

Deep cycle are much more tolerant of the deep discharge a house battery must endure repeatedly over years of camping use. They will give you the service RV'ers expect from their house batteries.

Unless you have a tiny RV and can get along with single 12 Volt, go with two 6 volt deep cycle...aka Golf Cart batts.

I just got a set from Costco for $85 each if you're looking for a good price.

Kayteg1 wrote:
Golf cart run on high voltage, yet they use 6V batteries.
Think about it.

very good point my 2200 series cart batterys are 245amp hour each
so 735 usable amps verses say 27Rv at around 120 each= 360

Kidoo wrote:
Hi, I am about to replace my house batteries. I was reading that connecting 2 x 6 volts in series will double the voltage but not the amps. Connecting 2 x 12 volts in parallel will keep the same 12 volts but double the amps.

For the same price, what is the best solution? I plan on buying the standard acid type batteries at Costco or Sam club.

a pair of standard costco 6 volters= one twelve will have as much amp hour as say two 27Rv 12 volters in some cases.it depends on the 27Rv rate battery u buy but the 2 six volters will only cost $160 approx. and the two 27Rv will cost more in most all cases
now only using a 24RV series battery the two sixes verses 2 24Rv would be the best root both $$$ and amp hour rating

Golf cart run on high voltage, yet they use 6V batteries.
Think about it.

It depends on the price and on your electric needs. Usually the 6V GC2 batteries end up being the most cost effective for the capacity. However, if you have rather minimal needs (you're basically always plugged in or driving down the road), a single 12V house battery may be sufficient and would be less expensive than a pair of anything.

You are correct that putting two identical batteries in series provides double the voltage but no increase in charge capacity (amp-hours), while putting them in parallel provides no change in voltage but doubles the charge capacity. I think it can be helpful for comparisons to think in terms of energy rather than charge--that is, watt-hours or kilowatt-hours rather than amp-hours, which you compute by multiplying the voltage by the charge capacity. Whatever battery gives you the most watt-hours per dollar is, all other things being equal, the most economical in some theoretical sense. (That is assuming you have need of the capacity...though it is generally preferable to have extra excess capacity as it means not discharging the batteries as heavily.)

I have a pair of 6V Sam's club golf cart batteries for my motorhome and they're working out very nicely for me.