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Old 05-10-2018, 12:50 PM   #1
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12V battery wiring

I found this diagram for how two 12V batteries should be wired in parallel and in series.

The other pics show how mine were wired. The wire going over the top (trailer) edge of the first goes to the trailer wiring. The extra attached to the red is the solar charger hookup (which I didn't find when I needed it!) the wires to the 2nd battery run in the covered lines to the 2nd battery directly from the first. So the first battery is wired to the trailer system and the second is just wired to the first.

It may not matter since I intend to put just one battery in place of the two, but curious about this wiring scheme.
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File Type: jpg Screen Shot 2018-05-10 at 10.40.59 AM.jpg (103.0 KB, 75 views)
File Type: jpg first battery.jpg (271.2 KB, 50 views)
File Type: jpg 2nd battery.jpg (332.2 KB, 42 views)
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Old 05-10-2018, 12:59 PM   #2
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Well, it's in parallel but a goofy way of doing it. I'd move either the + or the - that goes to the converter and ground to the other battery as shown in your first image, right side example.

At the very least I'd repair or replace all the rusted components and move one of the house connections.
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Old 05-10-2018, 01:50 PM   #3
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I'm going to have only one battery and will put new connectors on.
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Old 05-10-2018, 01:59 PM   #4
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So next question- I've read I should charge the battery after installing- that's fine as I'll hook up to house power for the next few days getting ready for Maryhill. Then discharge it about (varying percents suggested) and repeat cycle a few times. Correct/Not? How far to let it go down.
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Old 05-10-2018, 02:10 PM   #5
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I would charge it to 100% then just use it, trying to go no more then 50%.
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Old 05-10-2018, 02:15 PM   #6
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From my point of view that was a poor way of wiring two batteries. A simple battery switch would isolate each of them allowing for the redundancy of a second battery fully charged and ready to go. They can still be used at the same time for extra amps.

If one of you old batteries is still in fair or better condition I'd keep it as a spare isolated with a battery switch. There's a lot to be said for redundancy in systems.

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Old 05-10-2018, 02:17 PM   #7
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Both are six years old and dead. I'm going to replace one and if I decide that isn't sufficient will do as you suggest later. I like the switch idea.
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Old 05-10-2018, 02:28 PM   #8
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Quote:
Originally Posted by Ron in BC View Post
From my point of view that was a poor way of wiring two batteries. A simple battery switch would isolate each of them allowing for the redundancy of a second battery fully charged and ready to go. They can still be used at the same time for extra amps.

If one of you old batteries is still in fair or better condition I'd keep it as a spare isolated with a battery switch. There's a lot to be said for redundancy in systems.

Ron
Ron would like to change out the switch . Any suggestions ? We have the dual battery installation. Pat
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Old 05-10-2018, 02:29 PM   #9
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I would charge it to 100% then just use it, trying to go no more then 50%.
I rarely run on battery alone but I can let it run for awhile at home and make sure all is okay.
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Old 05-10-2018, 03:49 PM   #10
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Ron would like to change out the switch . Any suggestions ? We have the dual battery installation. Pat
I didn't know that you also had a dual 12V set-up. I've seen battery disconnect switches sold at non-marine type stores but I tend to stick with marine ones. West Marine has a large selection. Almost anyone of them would do and one with an alternator field disconnect isn't required.

My trailer one is a Blue Sea m series. I like having it recessed, not surface mounted as the wires are behind and not visible.

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