Good Sam Club Open Roads Forum: Educate me on 12 volt batteries
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 > Educate me on 12 volt batteries

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Guy Roan

Florida

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Posted: 01/30/21 12:24pm Link  |  Quote  |  Print  |  Notify Moderator

o

* This post was edited 02/02/21 05:16pm by Guy Roan *

ktmrfs

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Posted: 01/30/21 12:34pm Link  |  Quote  |  Print  |  Notify Moderator

BarneyS wrote:

Microwave runs on 110v not 12V - unless through an inverter.
Barney


yes, mine runs on an inverter. and two 6V batteries usually will trip out on low voltage at about 80% SOC, four 6V will go for about 50% SOC. While a single or couple of 12V will have much less voltage drop.

Draw is >100A, not a good peak draw on a 6V


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ktmrfs

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Posted: 01/30/21 12:42pm Link  |  Quote  |  Print  |  Notify Moderator

afidel wrote:

time2roll wrote:

Guy Roan wrote:

Off and on I see posts regarding changing out the 12 volt battery to two 6 volt ones.
In the past thirty years I have had three trailers and never had a problem with the single 12 volt battery so could someone please explain the reason for swapping to two 6 volt ones.

Guy
2x 6v is a solution to some issues. If you are good as is then just carry on. You will know when you need something different. Although soon it will be lithium batteries over the GC2 when a better system is needed.
Don't fix what is not broken.

It's getting really close already. I can now buy 270Ah of LiFePO4 cells for just over $400 direct from China. That's cheaper than 4x 220Ah 6V that you'd need to have the same usable capacity (~220Ah with long life), but the lithium solution would weigh about 1/5th as much and fit on the tongue or in a much smaller cabinet space.


four good GC have a useable capacity of (220x2)x0.75= 330AH Trojan T-125's have a cycle life of 500+ cycles discharged to 25%SOC (75% DOD) cycle life approaches 1000 cycles at 50% DDD.

Since most of us TT folks even with lots of boondocking would take years to get 500cycles on batteries, GC can give long life at very deep discharges.

I have gotten 10+ years with 30+ cycles to 25%SOC along with many at 50%DOD out of several sets of Trojan's. And several other camping friends have had similar life with similar discharge profiles.

Still a lot heavier than Lithium!!

theoldwizard1

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Posted: 01/30/21 02:53pm Link  |  Quote  |  Print  |  Notify Moderator

Lwiddis wrote:

More amp hours in two sixes.

BEST ANSWER !

Lwiddis wrote:

Difficult to find a “real” deep cycle 12 volt battery. Trojan makes a one or two deep cycle 12V last time I looked.

What most store sell as "deep cycle" dual purpose marine/RV batteries are liitle more than a typical engine starting battery with a different label.

Real deep cycle 12V batteries (Trojan T1275) are expensive and hard to find. The golf cart batteries sold at Costco and Sam's Club might not be the absolute best, but they are the "best bang for the buck" !

If you want AGM, AGM golf cart batteries do exist (6v Trojan T105-AGM, 12V Trojan T1274-AGM). Again, expensive and hard to find.

theoldwizard1

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Posted: 01/30/21 02:57pm Link  |  Quote  |  Print  |  Notify Moderator

afidel wrote:

It's getting really close already. I can now buy 270Ah of LiFePO4 cells for just over $400 direct from China.

TRUE !

But these are not "drop in replacements" ! They require a Battery Management System and wiring. Also, if you are upgrading from lead acid, you will need a new charger.

pianotuna

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Posted: 01/30/21 06:32pm Link  |  Quote  |  Print  |  Notify Moderator

What counts is usable amp-hours.

When inverters were hugely expensive and low wattage the battery format didn't matter much and twin six volts were the best bang for the buck.

Now that 2000 and 3000 watt inverters are common, and relatively speaking cheap, twin six volts are not quite as useful. What were exotic chemistries 25 years ago are now affordable. I know of a drop in 100 amp-hour LiFePo4 for $313 USD.

The ultimate would be Lithium Titonate because they can do 9C. SiO2 would be not shabby either. BL13 could run his 2k inverter at 20% state of charge on a single SiO2--but has since added a 2nd one.

Cost per usable amp-hour is the calculation I would use.

If you don't boondock--then pretty much any 12 volt would be just fine. But so would 2 six volt golf cart jars.


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.

parcany

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Posted: 01/30/21 07:56pm Link  |  Quote  |  Print  |  Notify Moderator

Maybe I am wrong but I agree 2- 6 volt have more amp hours but if one of the 6 volt batterys go bad than you only have 6 volts and nothing in the trailer will work. Yes if your one 12 volt battery goes bad nothing will work anyway.

time2roll

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Posted: 01/30/21 09:06pm Link  |  Quote  |  Print  |  Notify Moderator

parcany wrote:

Maybe I am wrong but I agree 2- 6 volt have more amp hours but if one of the 6 volt batterys go bad than you only have 6 volts and nothing in the trailer will work. Yes if your one 12 volt battery goes bad nothing will work anyway.
Yes however a shorted cell in a GC2 seems to be far more rare than a 12v marine battery.
4x GC2 also reduces to possibility of being stranded.


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profdant139

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Posted: 01/30/21 10:43pm Link  |  Quote  |  Print  |  Notify Moderator

I'm with parcany. I carry one 12v battery and a spare. If the battery in use dies or gets too low, I swap 'em out. This is a "belt and suspenders" approach. With two 6v batteries, you've got more capacity, but only as long as both batteries are healthy!

But there is a catch to my method -- this limits me, of course, to the capacity of one 12v. Since these are group 31 batteries, that's a total of 110 amp hours per battery, which means I can only use half of that without overtaxing the battery.

This system works if you are an energy miser (like me) or you have solar (which I do) or recharge with a generator (which I almost never do) or recharge at an RV park (which I do from time to time, especially if we have to do laundry).


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Grit dog

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Posted: 01/31/21 12:29am Link  |  Quote  |  Print  |  Notify Moderator

Guy Roan wrote:

Off and on I see posts regarding changing out the 12 volt battery to two 6 volt ones.
In the past thirty years I have had three trailers and never had a problem with the single 12 volt battery so could someone please explain the reason for swapping to two 6 volt ones.

Guy

Never had problems?
Be more specific. Nothing wrong with a 12V battery. However a statement like that makes me think your camper is plugged in to AC power most all of the time.


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