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 > 6-volt batteries over 12 volt

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Posted: 04/16/06 05:12pm Link  |  Print  |  Notify Moderator

What is the advantage to using 6-volt batteries over 12 volt deep cells ?

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Posted: 04/16/06 05:24pm Link  |  Print  |  Notify Moderator

If you do a search you will find that this question has been debated endlessly. I beleive that theoretically there is no inherent advantage to 6 volt batteries. A hundred pounds of lead in two 6 volt batteries hooked in series = a hundred pounds of lead in a single 12 volt battery.

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Posted: 04/16/06 05:25pm Link  |  Print  |  Notify Moderator

6 volt DEEP CYCLE batteries have nearly solid lead plates instead of those waffer cones used in most batteries. This gives them considerably more durability. Many 12 volt Marine/RV deep cycle batteries are little more than relabeled starting batteries (note that they list their CCAs on the battery). True deep cycle 12 volt batteries are pretty good also but still the plates are not as thick as on the 6 volts.

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Posted: 04/16/06 05:34pm Link  |  Print  |  Notify Moderator

See if some of these posts help.


Southern California

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Posted: 04/16/06 06:01pm Link  |  Print  |  Notify Moderator

12v might be deep cycle, starting, or a combo battery. 6v is only deep cycle unless you buy it from an old VW shop. The 12v might be easier to replace in a pinch. A bad cell in a 2 12v setup will keep working on one battery where as a dead cell in a dual 6v would reduce power significantly. If you are just comparing power, deep cycle 12 to deep cycle 6 it is about a draw. Size could also make a differance in what will fit.

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Posted: 04/16/06 06:02pm Link  |  Print  |  Notify Moderator

Obviously RoyC hasn't been reading all of the "question has been debated endlessly"
Take skipnchar's reply to the bank.
The short answer is: Two 6 volt golf cart batteries will perform longer than even two 12 volt deep cycle's. I've had both and the 6 volt route is the only way to go.

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Posted: 04/16/06 06:43pm Link  |  Print  |  Notify Moderator

eghershey wrote:

Obviously RoyC hasn't been reading all of the "question has been debated endlessly"....

I believe RoyC is on the money; pound of lead for pound of lead there is no inherent difference between 6V and 12V deep cycle batteries.

I believe the often repeated (even by me) Common Wisdom that 6V deep cycle batteries are better is based on four things:

1) When we say 6V battery we imply Golf Cart battery (BCI GC2 size designation.)

2) Golf Cart batteries are true deep cycle batteries.

3) Golf Cart batteries have about the same footprint as GRP 24 sized batteries but are quite a bit taller and have more lead in them (they weigh more) therefore hold more charge but occupy the same floor space.

4) Golf cart batteries are relatively inexpensive pound for pound.


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Posted: 04/16/06 06:56pm Link  |  Print  |  Notify Moderator

The 6 volt golf cart batteries are industrial duty deep cycle batteries. 12 volt industrial duty deep cycle batteries equal to a pair of golf cart batteries are available, but hard to handle because of the weight and not as favorably priced due to the wide distribution of the golf cart batteries. A pair of golf cart batteries gives the most for the money.


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Posted: 04/16/06 07:05pm Link  |  Print  |  Notify Moderator

This is from a post I made a year or so ago.


This is from an email I sent to Trojan battery in January.

The question

To: Technical@trojanbattery.com
Subject: Golf cart battery

Need you guys to help me out with a few questions.

1) Is there any advantage to using two 6 volt deep cycle batteries in series over two 12 volt deep cycle batteries in parallel in a RV application, and if so what are they.

2) Besides the number of cells what is difference in construction of a 6 volt golf cart battery like a T-105 and a 12 volt deep cycle battery. Of course in both cases I'm referring to Trojan batteries. (is there any other)

Thanks Sam Langford

The answer

Hello Sam:

The main advantage of using two 6 volt batteries connected in series is long life. They generally last about two times longer than 12 volt batteries. This is because 6 volt batteries have bigger and thicker plates that can better withstand the effects of deep cycling.

The main advantage of using two 12 volt batteries connected in parallel is backup. If one battery goes down, you will have the other battery to keep your system running. With two 6 volts, if one goes down then your entire 12 volt system is down.

In terms of capacity, if you get a couple of really good 12 volt, group 27 or higher, batteries then the runtime that you'll get out of the two systems is roughly the same.

If you need further assistance, please contact me.

Best regards,

Jim Le
Technical Support Engineer
800-423-6569 Ext. 301


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Posted: 04/16/06 07:08pm Link  |  Print  |  Notify Moderator

Electrically speaking there is no advantage of using a pair of 6 volt batteries over a single 12 volt battery. In fact the instant one connects the two 6 volt batteries he's created a 12 volt battery. But for the reasons that were well stated by dmartin and Kenneth, there are many advantages in using a pair of 6 volt batteries in your RV over a 12 volt battery, any 12 volt battery.


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