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Old 11-02-2007, 11:38 AM   #1
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My coach presently has two 12-volt batteries that will be needing replacement. I read that it is better to use two golf cart 6-volt rather than two 12 volt batteries. It that correct. If so, how to you wire them up? Thanks.
Steve
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Old 11-02-2007, 11:38 AM   #2
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My coach presently has two 12-volt batteries that will be needing replacement. I read that it is better to use two golf cart 6-volt rather than two 12 volt batteries. It that correct. If so, how to you wire them up? Thanks.
Steve
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Old 11-02-2007, 12:21 PM   #3
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It all comes down to AMP-HOURS. The usual reason is that heavy golf cart 6 Volt batteries will store more amp-hours than the regular marine deep cycle 12 Volt batteries. This is not always the case however.
The second reason is that the Heavy, Deep-cycle, Golf Cart batteries are produced in larger quantities than the heavy 12 Volt batteries and are usually cheaper, Amp-Hour per Amp-Hour.
The third reason is that a single 12 Volt battery that has the same Amp-Hour capacity as two 6 Volt Golf cart batteries weighs almost as much as both of the 6 volt batteries but in one case (60 to 100 Lbs) thus making it much harder to cram them into some of the compartments on motor homes.
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Old 11-02-2007, 12:32 PM   #4
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Your second question:
Most MH dc electrical systems are 12 Volt. With 12 Volt Batteries you wire them in parallel: Positive posts tied together feeding the positive side of the system. The negative posts are tied together and feed the negative, or ground side of the system.

It takes two 6 volt batteries to make one 12 volt battery and are wired in series. The easy way to remember how to wire in series is by feeding the positive post of only one battery to the positive side of the system. You feed the negative post of the OTHER 6 volt battery to the Negative or ground side of the system. You then connect the remaining two posts together. You are connected.
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Old 11-02-2007, 05:28 PM   #5
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It's not that 6V is better than 12v, but golf cart batteries are the most rugged and highest capacity batteries around in a size that will fit your battery space.

That said, you can buy Group 27 size 12V Trojan deep cycles and stick with the same wiring you have. They are available as flooded cell or AGM (maintenance free). Trojans are excellent deep cycle batteries - the Trojan T105 is the gold standard for 6V golf carts batteries but their 12v are excellent too.

ANother great brand is Lifeline, but they are available only as AGMs. AGMs are expensive - figure around $200 each, whether Lifeline or Trojan. But you never have to add water either.
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Old 11-03-2007, 01:15 AM   #6
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For those that like to do their homework on batteries:
http://www.usbattery.com/care.htm
http://www.dcbattery.com/faq.html#1
http://www.windsun.com/Batteries/Bat...ery%20Charging
http://www.rvsolarelectric.com/sources.htm
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Old 11-03-2007, 07:25 AM   #7
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watch out for amp hours - you want watt-hours (like you use to buy home electricity). watt hours is amp hours times volts. This isn't an issue in comparisons unless you start comparing batteries of different voltages.

watch out for the myths, such as the 6v or "deep cycle"

see Configuration for some background on factors and issues.

in general, most RV batteries die because they are abused - not charged properly and not stored properly. Get as much battery as will fit in your compartment designed for RV service from a reputable retailer and then put your attention and spare change into equipment that will charge them promptly and fully and do equalization and desulfation when you don't use them for a few weeks or more.
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Old 11-07-2007, 01:55 PM   #8
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Just replaced 3ea. 12V Gp-29 batts @ 630Ah (total), with 4ea. 6v @ 948Ah total. Weight wise, the 4th battery was about the same as a 4th 12v battery. But the net current of the 6v's equals an additional 1.5 12V battery
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Old 11-07-2007, 06:22 PM   #9
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I'm curious, Jeff. Where did you find Group 29 12v batteries that could produce 210 Ah each (for a total of 630 for three)? I have yet to find a 29 rated for more than 130 AH using the standard 20 hour discharge test.

Or for that matter, where did you find 4 x 6v that totaled more than 440 Ah for a set of 4? 220 AH per pair (440 for 4) is what the very best 6V golf cart batteries can produce. Many of us would love to know where to purchase such powerful batteries.

Or have you perhaps quoted the CCA (cranking) rating instead of the deep cycle amp-hour spec?
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Old 11-08-2007, 04:04 AM   #10
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220AH is for the smallest commonly used GC battery, T105. Other common larger sizes are T125 (240 AH) and T145 (260 AH).

With a little research you can find more powerful GC batteries than the T105s.
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Old 11-08-2007, 07:44 AM   #11
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I have been planning on converting over to 6v batteries this winter. However, it just occured to me (I guess I'm slow) that if one 12v battery goes south, you still have power. Not so with 6v batteries since you need 2 to get the required 12v. Yes?
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Old 11-08-2007, 08:08 AM   #12
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Yes, if one of a pair of 6-volt batteries dies, the pair is essentially dead.

But then, when you look at a battery it has
3 - cells, if it is a 6-volt battery
6 - cells, if it is a 12-volt battery
So either way you are working with 6 cells, all of which must be working for any part of the battery (or battery pair) to work.

Loss of just one cell in a battery bank hampers the work of the entire bank (the part in series specifically).
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Old 11-08-2007, 09:15 PM   #13
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by RV Roamer:
I'm curious, Jeff. Where did you find Group 29 12v batteries that could produce 210 Ah each (for a total of 630 for three)? I have yet to find a 29 rated for more than 130 AH using the standard 20 hour discharge test.

Or for that matter, where did you find 4 x 6v that totaled more than 440 Ah for a set of 4? 220 AH per pair (440 for 4) is what the very best 6V golf cart batteries can produce. Many of us would love to know where to purchase such powerful batteries.

Or have you perhaps quoted the CCA (cranking) rating instead of the deep cycle amp-hour spec? </div></BLOCKQUOTE>Sorry, my bad. That's the RC rating for the Interstate SRM-29. All I really care about is this number since they're the house batteries and all I want is low to occasional medium current run times. Reserve Cap works for me. These are standard issue U2200's. No big deal, but they just fit, and have way better capacity than the 29's in a slightly larger footprint (but shorter).
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Old 11-09-2007, 05:01 PM   #14
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RC, which is measured as minutes at a 25 amp discharge rate, is one good way to measure deep cycle capacity. Amp-hours is the other and both work as long as you are comparing apples to apples.

In my opinion the U2200's are superior to the SRM 29's in terms of deep cycle life and ruggedness - I think you made a wise choice.
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