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Old 03-11-2017, 05:21 PM   #1
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Two 6 volt vs One 12 volt deep cycle battery

Hi,

My buddy needs a new battery for his TT.

He is looking at a 12 volt deep cycle, would he be better with two 6 Volt deep cycle, and if so why?

Thanks,
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Old 03-11-2017, 05:30 PM   #2
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For the same capacity, usually it's cheaper to buy 2 gc2 6v 220Ah than 1 12v 220Ah. Reason being is the gc2 is mass produced for golf carts. It's also easier to handle 2 smaller batteries.
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Old 03-11-2017, 05:31 PM   #3
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That's great, he was looking a 12volt 110mah deep cycle.
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Old 03-11-2017, 05:35 PM   #4
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If that's all he needs for capacity, then stick with a single 12v. I get about 5-6 days use off the grid with 220Ah (down to 11.9V), running only the water pump, lights and fridge. Normally we only plan on using half the battery's capacity in order to prolong it's useful life. I find that GC2s last about 6-7 years with maintenance once a year .
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Old 03-11-2017, 05:41 PM   #5
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If the 110 AH 12 volt battery is at the 20 Hour rate then it's only price and fit that come into play.

The 12 volt battery will probably be a GP31 size, so he would need room for 2.

The 6 volt GP GC2 is smaller them a GP31 but a bit taller.

As far as cost, a pair of 6 volt GP CG2 batteries are almost always cheaper then 2, 12 volt deep cycle batteries.
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Old 03-11-2017, 06:45 PM   #6
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I'd get 2x gc2 6v (wired in series) over 2x 12v 110ah (wired in parallel) if that's what he's considering.
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Old 03-11-2017, 06:57 PM   #7
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He is considering one 12 volt to see how that works and possibly adding a second.
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Old 03-11-2017, 07:30 PM   #8
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Batteries must be matched in size and preferably the same age and type. Not a good idea to buy one and later on paralllel another.

Send these links to your friend

http://www.batteryuniversity.com

http://www.marxrv.com/12volt/12volt.htm
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Old 03-12-2017, 01:16 AM   #9
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If your friend is going to try out the batteries for a few weekends, there wouldn't be a problem with adding a second one. Make sure it's the same type.

It's not like we're buying batteries in matched sets.

You don't want to match up old failing batteries with new.

Many folks find one bad battery, in a older group and replace it. This creates problems because if one went bad the others are not far behind. The new one is forced to carry more of the load of the other old ones.
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Old 03-12-2017, 05:05 AM   #10
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Thanks all for posting, I much appreciate it.

My buddy was at my house last night so asked the question while he was here. I have passed the information to him and he is getting a battery soon.

Thanks all,
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Old 03-12-2017, 07:49 AM   #11
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Quote:
Originally Posted by twinboat View Post
If your friend is going to try out the batteries for a few weekends, there wouldn't be a problem with adding a second one. Make sure it's the same type.

It's not like we're buying batteries in matched sets.

You don't want to match up old failing batteries with new.

Many folks find one bad battery, in a older group and replace it. This creates problems because if one went bad the others are not far behind. The new one is forced to carry more of the load of the other old ones.
I Concur.
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