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Old 09-19-2014, 10:33 AM   #1
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Batteries

I have one now on my 27? Thinking of adding a second and a marine 2 battery switch? Has anyone does this and is it a good idea?


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Old 09-19-2014, 10:44 AM   #2
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I don't see why not. The caveat would be they won't be charged simultaneously, I would install 2 similar (better identical) 12 Volt batteries in parallel instead of switching.
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Old 09-19-2014, 11:21 AM   #3
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Old 09-19-2014, 11:29 AM   #4
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Ok easy to do but is it better for 2 marine 12 volts? I hear some putting 4 6 volts in their RV's. I switched from boating where I always had 4 Heavy Duty Marine 12V batteries so familiar with the design just not sure which works best


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Old 09-19-2014, 11:52 AM   #5
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Quote:
Originally Posted by wicked1 View Post
Ok easy to do but is it better for 2 marine 12 volts? I hear some putting 4 6 volts in their RV's. I switched from boating where I always had 4 Heavy Duty Marine 12V batteries so familiar with the design just not sure which works best


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If you want to go this route
2 6 Volt 230 Amp True Deep Cycle batteries would be even better, or 4 or 6 but watch out for the weight, they are 75# a piece.
Golf cart batteries would be a good option, or AGM's they're expensive but maintenance free and will not cause corrosion due to off gassing in the battery bay and will last you a long time if you keep them charged properly.
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Old 09-19-2014, 12:09 PM   #6
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You can do either 12's or 6's, depending on your choice. The general consensus seems to be that the 6's provide more total AmpHours than 12's but that's going to come down to the specific batteries you buy. The trade off is the 6's take more weight/space (because you need 2) and usually cost more.

If you're looking to add to the existing battery, I'd stick with what you're proposing. Just add another 12 and control it with a switch. You don't want to just wire a new one in parallel without the switch unless your replacing the existing battery since you want the batteries to be the same. Mixing and matching could lead to premature failure of the batteries otherwise.

The only recommendation I'd make is to look for a true deep cycle over a marine battery. (Unless of course you happen to have them laying around already.) A marine battery usually doesn't provide as many AH as an equivalently sized deep cycle because the marine is setup to provide some CCA, where as the deep cycle is not.











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