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Old 07-16-2016, 04:59 PM   #1
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12 V Battery Connection

I am asking which of the diagrams below is the correct way to connect two 12volt batteries in my motorhome? Or does it matter?

First diagram shows how the batteries in the old motorhome were connected.

Second shows how my new motorhome batteries are connected.
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Old 07-16-2016, 05:18 PM   #2
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#2 is best
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Old 07-16-2016, 05:23 PM   #3
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X2 with #2
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Old 07-16-2016, 05:29 PM   #4
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x3 for second connection.
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Old 07-16-2016, 05:34 PM   #5
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12 V Battery Connection

First connection will draw equally though both batteries.

Both will work. First one works better.

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Old 07-16-2016, 05:44 PM   #6
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Well, I flunked the Smarty Pants thread...........so I probably will expose more ignorance here.......

But, other than the pictures and the batteries are turned 90 degrees from each other, what is the difference? Both are wired in parallel. The only true difference I see is that in #1 the neg goes to neg on the source, and in #2, the neg goes to a ground.

?????
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Old 07-16-2016, 05:46 PM   #7
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Honestly, you shouldn't see any difference at all. You're not really "pulling" through one battery into another as you would with a series connection. You're just tying posts together and drawing from both at the same time. One battery may be slightly less efficient, but that will be due to the resistance in the wire between the two, which will be negligible.
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Old 07-16-2016, 05:48 PM   #8
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Basically the batteries are joined.
Pos is hooked to one battery, neg to the other. That way current is drawn through both.

It matters more during high current/load situations, but if you can do it correctly, why not?


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Old 07-16-2016, 05:51 PM   #9
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If you want to get really fancy.

This one goes as far as equal length cables.

Even on my two battery setup, I tried to be as equal length as possible. Click image for larger version

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Old 07-16-2016, 05:51 PM   #10
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Slightly OT, but more important than which method you choose is that the batteries be of same type, equal capacity and very close in age.
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