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Old 05-16-2022, 01:41 PM   #1
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12 volt vs 6 volt batteries

Greetings, I am down sizing considerably from a motor home to a small travel trailer which we will use a lot off grid at NASCAR races. I asked for 2 twelve volt group 27 batteries but it seems like there is a debate about 12 volt vs 6 volt. Any suggestions or recommendations is greatly appreciated.
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Old 05-16-2022, 01:49 PM   #2
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Good Afternoon It all get down to internal "plate" size 6Volt have near the same size as a 12vdc.( lead acid flooded speaking ) outside dimensions However the internals are where thing change. the internal plates that store the electrons are much larger thus more storage ...... OHMS law dictates the 6vdc batteries with be "series" due to adding voltages to reach 12vdc... The best 12vdc batteries ( flooded) will never have the amp hours a 6 can provide. Topics of. GEL / battle born and you name the latest TECH... to me are great if packaging / space / weight are a concern are an consideration... But at least 2 6vdc will make you pleased...
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Old 05-16-2022, 02:23 PM   #3
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I have a 2011 Fun Finder 210 w b s that I converted to the 2 6volt deep cycle batteries. My DW and I need to sleep with a c pap and a bi pap machine so needed the extra reserved power. I don't believe you can do better for the money. Just remember to keep an eye on the water level. Easy to do. We can boondock for a couple of days.
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Old 05-16-2022, 02:40 PM   #4
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Typically a pair of deep cycle 6v lead acid will provide more capacity and longevity, and better performance, than a deep cycle 12v lead acid setup. And at a comparable or less cost.
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Old 05-16-2022, 02:46 PM   #5
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I would use 2 6V batteries as my undersatnding is like the post above in that they will last longer and have more capacity of flooded lead acid types. AGM 12V batteries make it closer but 2 6v batteries still win.
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Old 05-16-2022, 02:54 PM   #6
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2x 6v gc will be better and less expensive, but can you handle the added weight on the trailer tongue? For many, towing with a 1/2 ton or mid-size, the answer is no.
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Old 05-16-2022, 02:58 PM   #7
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When I purchased my 5th wheel, the dealer installed 2 - 12 volt group 24 rv/marine batteries. They struggled (at best) just to get the landing gear down and the slides out. I changed to 4 - 6 volts (wired series/ parallel), and haven't had any issues since.
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Old 05-16-2022, 03:06 PM   #8
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Measure the size of your battery tray then look at a battery group size chart to see what will fit. 6v will most likely win out because of cost. It's not that hard to find 12v batteries that will equal a pair or two of 6GC output, but it's hard to find them close to the price of the 6v batteries.
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Old 05-16-2022, 03:13 PM   #9
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Quote:
Originally Posted by Marine359 View Post
2x 6v gc will be better and less expensive, but can you handle the added weight on the trailer tongue? For many, towing with a 1/2 ton or mid-size, the answer is no.


Interesting, I thought 6 volt batteries were lighter.
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Old 05-16-2022, 04:08 PM   #10
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Interesting, I thought 6 volt batteries were lighter.


They have more lead, so generally not lighter. Be sure to only look at GC2 batteries which are made for golf carts.
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Old 05-16-2022, 04:28 PM   #11
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Quote:
Originally Posted by pasdad1 View Post
They have more lead, so generally not lighter. Be sure to only look at GC2 batteries which are made for golf carts.
Thanks
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Old 05-16-2022, 04:55 PM   #12
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Interesting, I thought 6 volt batteries were lighter.
On the contrary. The GC2 NAPA part # 8144 6V. Golf Cart battery weighs 64#
I use 2 in my motorhome. The first pair was installed by me in May of 2015 and I replaced both July of 2020. Price is around $150 each exchange. If you don't have a core for return you may have to pay a core charge. Everywhere they sell batteries has the same policy.
They measure: Height: 10.875" Length: 10.25" Width: 7.125"
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Old 05-16-2022, 05:27 PM   #13
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Here is the essence of why 6V GC
https://marinehowto.com/what-is-a-deep-cycle-battery/
Lots of choices but if FLA 6V GCs are a well proven choice and cat reasonable cost & life if maintained properly and not abused.
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Old 05-17-2022, 06:25 AM   #14
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How much does lead weight

Lead is lead and it weights the same in a 6 volt battery as it does in a 12 volt battery. 150 pounds of lead in two 12 volt batteries is the same as 150 pounds of lead in two 6 volt batteries.

Lead is the capacity carrying element in both batteries. Double the weight will double the capacity in both.

If you never draw your battery bank down below 50%, the thickness of the plates doesn't make any difference.

The question for many people is actually price per pound. Which one can you get cheaper per pound or more easily determined, price per amp hour.

For me not having acid spraying onto near by structure and not having flammable hydrogen gas floating about means I choose AGM type lead acid batteries. Cost is higher, but features are better.

AGM work better than flooded cell 6 volt gulf cart batteries for RV use.
In this case, 12 volt batteries are excellent. They deliver relatively higher currents and charge relatively faster.
They can be completely discharged flat out with no noticeable loss of capacity or service life.

Choosing An RV Battery https://www.irv2.com/forums/download...do=file&id=231
This is a good article, but its recommendations against “Marine Batteries” does not apply to “Marine AGM batteries”.

Battery University https://batteryuniversity.com/articles

How does the Lead Acid Battery Work?
https://batteryuniversity.com/articl...d-battery-work

How do battery chargers work
https://batteryuniversity.com/articl...-chargers-work

How to Charge and When to Charge?
https://batteryuniversity.com/articl...when-to-charge
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