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post #1 of 21 Old 09-30-2019 Thread Starter
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Odd Battery setup

Hunter 34 with an odd battery setup.

As you can see someone messed up the battery wiring, didn't even use the right colors.

Any guesses as to what the PO was thinking.

As you can see from my crude drawing a negative wire from the battery is going through the bulkhead and one battery's negative terminal is not even attached to anything.

Any guess as to what the idea was.

I'm guessing that the two red positives go the switch. the negative goes back to a negative bus bar or alternator. On the other side of the switch where I can't see is a red wire to the positive switch panel I suspect.

I'm assuming that it was originally a two battery setup and someone added the third battery and never finished the install.
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IMG_20190929_233035.jpg   IMG_20190929_160718.jpg   IMG_20190929_160707.jpg  

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Last edited by davidpm; 09-30-2019 at 01:13 AM.
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post #2 of 21 Old 09-30-2019
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Re: Odd Battery setup

I'm guessing it's a 2 bank setup with 2 batteries connected in parallel for a house bank. I see all the negatives connected. Looks like the two on the right are in parallel.

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post #3 of 21 Old 09-30-2019
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Re: Odd Battery setup

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Originally Posted by JimsCAL View Post
I'm guessing it's a 2 bank setup with 2 batteries connected in parallel for a house bank. I see all the negatives connected. Looks like the two on the right are in parallel.
If the drawing is correct than none of these batteries are connected in parallel or series for that matter, the two that share the negative bus provide two independent 12vdc buses, assuming these are 12vdc batteries. The third with only the positive connected to other other battery is floating, not a good situation as it is neither totally connected nor totally isolated, IMHO.
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Re: Odd Battery setup

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If the drawing is correct than none of these batteries are connected in parallel or series for that matter, the two that share the negative bus provide two independent 12vdc buses, assuming these are 12vdc batteries. The third with only the positive connected to other other battery is floating, not a good situation as it is neither totally connected nor totally isolated, IMHO.
I'm thinking that for now, I should just disconnect the positive on the third until we figure out how to do this right.

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Re: Odd Battery setup

Why not re wire it properly?

pay attention... someone's life depends on it
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Re: Odd Battery setup

Hey,

My guess: A two bank setup. Bank 1 is a single 12VDC battery. Bank 2 is 2 6VDC batteries in series to total 12V.

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Re: Odd Battery setup

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Originally Posted by SanderO View Post
Why not re wire it properly?
Disconnecting the third and it would be connected correctly if the goal was 2 separate 12 vdc buses, with a common ground bus.


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Re: Odd Battery setup

all three look like 12v batteries according to the labels. on your schematic, where do the red cables go? if they are connected, then that bank is parallel.
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Re: Odd Battery setup

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all three look like 12v batteries according to the labels. on your schematic, where do the red cables go? if they are connected, then that bank is parallel.
Could be parallel yes, if they do go to the same point but that is not what the diagram shows. If they are connected later on this would not be in the best practices for connecting batteries in parallel as it is best to keep the cables connecting the two batteries as short as possible, the added inherent resistance of the cables and connections, as well as the parasitic inductance and capacitance of them also can lead to the batteries to become unbalanced and affect the life of the batteries is connected as such.


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Re: Odd Battery setup

Just to be clear, I don't think your wiring sketch is correct. If I look at the second pic that shows all three batteries, I see connections on all three negatives.

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