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Old 11-13-2018, 08:38 PM   #1
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House Batteries — Confused

Ok, now my rv repair shop has me confused, who is a Forest River dealer.
Took my 2016 369xl in today for new batteries and a check over before my Thanksgiving trip. Currently have 4 12v batteries which is how the rig came from FR. He strongly suggested that I replace them with 4 6v batteries. Said I will get better life and performance out of them.
Having trouble getting my head wrapped around this. Does this make sense?
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Old 11-13-2018, 08:45 PM   #2
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Yes it makes sense if you have the room for them. You will get more amp hours and they can be wired to give you 12v
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Old 11-13-2018, 08:50 PM   #3
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Watch this video might help you understand

https://youtu.be/Xt2igyyyNb4
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Old 11-13-2018, 08:53 PM   #4
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Quote:
Originally Posted by Tx2Stepn View Post
Yes it makes sense if you have the room for them. You will get more amp hours and they can be wired to give you 12v


Thanks for your reply. This is my 4th mh. I can do most repairs, services and mods myself, but when it comes to anything electrical my mind goes to mush.
Thanks again.
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Old 11-13-2018, 09:09 PM   #5
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[...] You will get more amp hours [...]
Not necessarily true. Good quality 12 V batteries will be about the same as 6 V, when used in these multiple-battery circuits. For example, Trojan's group 27 12V is rated to 105 A-Hrs and the T-105 6V is at 225 A-Hrs ... so, about 15 A-Hrs more in the 6V than 12V, which probably is negligible. A group 29 will have even more.

There are some benefits to going with 6 V. Capacity generally isn't one of them ... unless you're comparing really crappy 12 V to good quality 6 V.

Good luck.
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Old 11-13-2018, 09:26 PM   #6
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Originally Posted by 67L48 View Post
Not necessarily true. Good quality 12 V batteries will be about the same as 6 V, when used in these multiple-battery circuits. For example, Trojan's group 27 12V is rated to 105 A-Hrs and the T-105 6V is at 225 A-Hrs ... so, about 15 A-Hrs more in the 6V than 12V, which probably is negligible. A group 29 will have even more.

There are some benefits to going with 6 V. Capacity generally isn't one of them ... unless you're comparing really crappy 12 V to good quality 6 V.

Good luck.
I have eight of the Trojan T-105 6v batteries on my solar setup. All wired in series to give me about 50.6v to my 3600 watt pure sine wave inverter. Those batteries weigh 62 lbs each. Definitely some advantages to good 6 volt batteries over 12 volt.
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Old 11-13-2018, 10:34 PM   #7
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Actually there are virtually no differences in 12 volt and 6 volt batteries. As long as they are the same weights and deep cycle. The room will generally dictate which way to go.
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Old 11-13-2018, 11:41 PM   #8
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The 6v over 12v comparison does lead to the 6v being slightly superior in build quality for the purpose of RVing.

Vehicle and deep cycle batteries are build with multiple (3 or 6) 2v cells wired in series to obtain the needed voltage. While 2 6v batteries can be wired in series and 2 12v batteries can be wired in parallel to obtain the same amp hours, the 6v batteries will have 2 slight advantages over the 12v.

The 6v batteries are physically the same in size and weight to a 12v battery; however, housing 3 larger 2v cells, allows the battery to be charged and drained more evenly and consistently (balancing the voltage on 3 instead of 6 cells). 2 6v batteries wired in series forces the batteries to charge and drain and a very even 12v using the exact same amp hours out of each battery.

The 12v batteries have 6 2v cells to make 12v. Charging these batteries, the chargers have to do twice the effort to balance the 6 cells per battery instead of 3 cells per battery. This can lead to inconsistent charging where some cells will take more amperage over others....but, a battery is only as good as it's weakest cell. The other thing to be concerned with 2 12v batteries is wired in parallel, the batteries are both supplying 12v of power but one could be discharging faster than the other. This can also lead to shorter battery life as the 2 batteries will constantly be trying to balance each other in voltage.

Long story short, the 2 6v batteries will have 6 large cells and be wired in series to provide a uniform, single 12v power supply. The 2 12v batteries will have 12 small cells and be wired in parallel to provide 2 12v power supplies that are independent of each other but still try to balance each other out.
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Old 11-14-2018, 09:17 AM   #9
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If you don't expect to do a lot of boondocking your 12 volt batteries are fine.
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Old 11-14-2018, 11:31 AM   #10
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6V golf cart batteries weigh close to the same as a 12V regular lead acid battery. The reason being is the very large surface area of the plates on the 6V version. Half the number of plates as a 12V battery, yet close to the same weight. These 6V batteries were designed for deep discharges, and quite a bit of abuse by commercial golf course usage.

The benefit is when two 6V batteries are used to replace one 12V battery. As an example, one T1275 deep cycle battery is rated at 150Ah @ 20 hour discharge rate (standard used).

Ref: https://www.trojanbattery.com/product/t-1275/

The T105 deep cycle battery is rated at 225AH @ 20 hour discharge rate. Two of these in series would give you 12V and 225AH of capacity.

Ref: https://www.trojanbattery.com/product/t-105/

I have a solar setup at home, and have used 6V golf cart batteries for over a decade. I power part of my home with the energy collected/stored.

That said, I'm using 4 Trojan T1275 batteries in my golf cart. It actually has the option to use 8 T105 batteries, but the cost and weight isn't a big benefit for my application.

If you decide to buy Trojan batteries, check your local golf cart shop FIRST. I paid (with core exchange), state fees and taxes $772.54 for all 4 T1275 batteries. While this ain't cheap, it was a lot less expensive than having other shops order them for me. Furthermore, with the high turnover rate at a golf cart shop, all the batteries were fresh from the factory.

When my 4 RV house batteries die, this is what I'll be purchasing.
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