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Old 03-04-2013, 04:27 PM   #1
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Why Twin 6V?

What advantage do twin 6-volt batteries have over the single 12-vole battery set-up? There must be many or it would't be offered. Can I run more devices at one time? Do I have more power available? Do they recharge faster? Hold their charge longer....? Thanks for letting me know.

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Old 03-04-2013, 04:39 PM   #2
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The RV Doctor: RV Batteries - 6 or 12 - Volts, That Is
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Old 03-04-2013, 04:43 PM   #3
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The 6 volts that are used in most rv applications are originally designed for electric golf carts and due to their heavier and taller plate contstruction are able to draw them down to a lower capacity with out damaging the plates and also provide a larger amp /hr rating or reserve capacity. Two 6 volt wired is series to provide a 12 V source is a much larger capaicty than even two 12 volt batteries and are more suited to the rigors of rv use. Just don't make the mistake that many do and use a small little 14 guage wire between the two batteries. I was very disapointed when we picked up our 19 ft last summer to find that was how it was wired.
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Old 03-04-2013, 05:29 PM   #4
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... Just don't make the mistake that many do and use a small little 14 guage wire between the two batteries. I was very disapointed when we picked up our 19 ft last summer to find that was how it was wired.
Dave, did you provide feedback to Reace regarding your thoughts on the 14 gauge wire, and if so, what was his response?
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Old 03-04-2013, 06:07 PM   #5
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Weird. It was Reace who told me to get a #10 ground wire installed when the tow was wired ( at the time I was planning on a 3-way fridge ).
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Old 03-04-2013, 06:36 PM   #6
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No I didn't talk to Reace I just fixed it my self. The cable between the batterys should be at least a # 2 welding calble in my opinion. I also plan to change the cables from the batterys to the inside of the trailer this spring when I wire my inverter, I will also run welding cable to the electrical centre inside the trailer.
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Old 03-04-2013, 07:00 PM   #7
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What problem could there be with the 14-gauge?

I know two 6Vs is better than one 12V but I am surprised to find that two 6Vs is better than two 12Vs. Same reason as for one, I guess. Never thought about two 12Vs but it is what I would have supposed bigger units use.
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Old 03-04-2013, 07:04 PM   #8
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Dave, why 2 gauge cable? It seems like major overkill, especially on a short run like that. I can't remember for sure, but what is the main fuse rated at, 30-40A? 2 guage wire is rated for 100A.
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Old 03-04-2013, 07:09 PM   #9
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What problem could there be with the 14-gauge?
14 gauge is safe for 15 amp. That's just not enough... It's not a very long run, but I'd be concerned about it getting very hot under sustained load.
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Old 03-04-2013, 07:24 PM   #10
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My twin 6 volt batteries are wired together with 10 gauge straight from the factory which in my mind is plenty for what is running on 12 volt in the trailer. The LED lights draw practically nothing so all that's left is the water pump, (what 4 amps?), the furnace fan, 1.8 amps and the small draw from the fridge when on propane and the carbon monoxide detector. Even if you add a 150 watt inverter running from the 12 volt plug that will only draw around 13 amps. 10 gauge wire is good for 30 amps of continuous draw so unless you have a built in inverter then you should be good to go.

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