Dale M. wrote:David_L6 wrote:Bogo wrote:Dale M. wrote:David_L6 wrote:OK. That makes sense. Thanks for the explanation. I thought that's how it worked but I wasn't sure.
To answer your question... From what I've been able to find on the RV and marine forums I can get more amp hours from two 6 volt batteries than from two 12 volt deep cycle batteries and I'll also get longer life out of the batteries.
NO matter what people tell you, size matters..... Personally I would not want to mess with multiple batteries.... One huge 12 volt should do it....
Dale
Yep, one Rolls Surrette 12 CS 11P should do it.It only weighs 272lbs.
BTW, the largest commonly available battery is the 8D size. 230 to 270 Amp hours, and 160lbs each. Most marinas that handle older large pleasure craft will have them. I know in the past they were also used for starting trucks and tractors with large engines so you may find them at truck stops. A pair of Group 31 batteries has now replaced them due to being able to be lifted individually. Each Group 31 battery is only 75lbs, and a pair of them in parallel should provide 210 to 240 Amp hours at 12VDC. Modern batteries are much better at handling being paralleled, but still get a pair or set from the same production run. Don't parallel lead-acid batteries of different capacities, ages, chemistries, or general styles. If you do, then you will likely kill them, unless they are of the same chemistry and always being charged or discharged. No resting between charging and use allowed.
Two group 31 batteries? You mean a pair of these: http://www.newegg.com/Product/Product.a ... 08705Y6689
Not at that price...
Dale
No kidding!
Actually, I've been looking at these:
6 volt: http://www.bdbatteries.com/rvflyer.php?id=15
or
12 volt: http://www.bdbatteries.com/rvflyer.php?id=48
