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Open Roads Forum  >  General RVing Issues

 > 6 or 12 That is the question

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pianotuna

Regina, SK, Canada

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Posted: 08/03/21 04:14pm Link  |  Quote  |  Print  |  Notify Moderator

If they plan on running the inverter I'd go 12 volt. One reason is 50% less demand on each cell.

If they want to just charge small items--then a 2000 watt inverter is over kill and they would be better to use a 300 watt inverter with six volts.

You pay your money and you take your chances!

I've always done 12 volt because I want to use a LARGE inverter/charger so I can use it for load support.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Bumpyroad

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Posted: 08/03/21 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Simply put, 6V golf cart batteries are designed and manufactured differently. Specifically they are design for multiple deep discharge (about 25%)/charge cycles. 99% of the 12V batteries will have a shorter life if you discharge them that much.

A pair of golf cart batteries can store about 220Ah of energy. A Group 24 RV battery, only 75Ah. Even the larger Group 31 batteries can only store about 100Ah.

Yes, a pair of golf cart batteries will cost more than a single 12V, but not twice as much?


why do you compare one 12 volt vs two 6 volt batteries? given your numbers, it would be a 200 vs 220 comparison with 2 12 volters
bumpy





wa8yxm

Davison Michigan (East of Flint)

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Posted: 08/03/21 05:39pm Link  |  Quote  |  Print  |  Notify Moderator

Actually Group 31 are about 130 but wait there is more (27/29 are about 100)

Most of the "Group xx" batteries out there are either straight up starting or MARINE/deep cycle.. these batteries should be kept fairly full for best life. Rapid againg sets in around 75% (M/dc) or 80%(Starting) where as a TRUE Deep Cycle can go to half full before that happens.. or so they say. NOTE there will be differences berand to brand. Also the ability of the battery to recover from an "OH C**P!" level run down (like the volt meter has only one digit run down) is better with the DEEP CYCLE.

GC-2 (Golf Car, takes 2 to make 12 volts) and GC-12 (Golf Car, 12 volt) are DEEP CYCLE batteries.

LiFePo4 is even better, and more costly and other things that matter some good some not so much... (I'm just starting to play with those)


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ssthrd

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Posted: 08/03/21 05:57pm Link  |  Quote  |  Print  |  Notify Moderator

Which is better-- 2x6V deep cycle or 2x12V deep cycle for boondocking? My setup right now is 2x6V which gives me 260 ah. I found 2x12V that will give me (2x150=) 300ah. Are the 12's really better than the 6's?


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ktmrfs

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Posted: 08/03/21 07:21pm Link  |  Quote  |  Print  |  Notify Moderator

ssthrd wrote:

Which is better-- 2x6V deep cycle or 2x12V deep cycle for boondocking? My setup right now is 2x6V which gives me 260 ah. I found 2x12V that will give me (2x150=) 300ah. Are the 12's really better than the 6's?


assuming you keep your amp draw to 30A peak or so, I'd go with 6V. that is typical load is some LED lights, a gas fridge, an exhaust fan.

Now a pair of 6V GC2, 250AH useable AH is 250*0.75 about 180-190AH. That's correct, you can discharge typical GC2 batteries down to 25% SOC and STILL get hundreds of cycles out of them. Trojan std GC2 is 500 cycles @ 75% DOD. Compare that to a very good set of 12V that give you life at 50% DOD, even trojan 12V deep discharge cycle life drops like rock once you go below 50% DOD. So the 300AH 12V give you 150AH cycle life at 50%. Advantage goes to GC2.


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Cummins12V98

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Posted: 08/03/21 10:57pm Link  |  Quote  |  Print  |  Notify Moderator

Interesting there are so many different opinions on this.

Grit Dog says two 6v all the way so I will side with him as y'all know we agree on everything. [emoticon]


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pianotuna

Regina, SK, Canada

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Posted: 08/03/21 11:01pm Link  |  Quote  |  Print  |  Notify Moderator

ssthrd wrote:

Which is better-- 2x6V deep cycle or 2x12V deep cycle for boondocking? My setup right now is 2x6V which gives me 260 ah. I found 2x12V that will give me (2x150=) 300ah. Are the 12's really better than the 6's?


If you have HIGH draws yes the 12 volt are better (though probably not cheaper)

If you don't have high draws, the 6 volts may have greater cycle life.

Grit dog

Black Diamond, WA

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Posted: 08/03/21 11:27pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Interesting there are so many different opinions on this.

Grit Dog says two 6v all the way so I will side with him as y'all know we agree on everything. [emoticon]


[emoticon]


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valhalla360

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Posted: 08/04/21 05:49am Link  |  Quote  |  Print  |  Notify Moderator

Deep cycle batteries have a smaller number of thick plates.
Starting batteries have a larger number of thin plates.

Maximum amperage is a function of plate surface area. So more thin plates allow for more surface area and thus more amps...very useful turning over a big truck diesel.

Thicker plates allow you to take the charge down lower with less long term damage...very useful for deep cycling low to moderate house loads.

A 2000w inverter will be pulling less than 170amps
A 6-7liter diesel may be pulling 700-1000amps when starting but only for a few seconds

6v golf cart batteries are true deep cycle batteries.
The 12v trolling motor/combo batteries are relabeled starting batteries.

So for the same amp-hr rating, you won't see much difference initially but if you really use the capability, the available amp-hr in the starting batteries will drop more quickly as they wear out. If you only rarely boondock, you may never notice.

You can use deep cycle batteries for starting and it will cause them no damage. The issue is you will need more of them to develop enough amps. Quite common on cruising sail boats where you are turning over a small 20-40hp motor. It doesn't take a lot of amps, so the battery bank set up for house loads has plenty of cranking amps to turn over the small motor.


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wanderingbob

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Posted: 08/04/21 08:03am Link  |  Quote  |  Print  |  Notify Moderator

I read Valhalla statement about 2 six volts turning a small motor . I am glad that I had not read it years ago when for seven years I had two 6 volt golf car batteries starting a 6-71 Detroit in a dive boat !

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