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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 08-10-2013
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Another Battery Hookup Question

I know, I know; there are a lot of these questions, but none gave me the feeling I knew with certainty how to hook up the batteries correctly, and I would like to get this right.

Hooking up 2 group 27 batteries and using a solar panel with a charge controller.

1. From the controller, do I connect the red lead to red on one battery and the black to the other one?

2. The positive from each battery only goes to the switch, the positives from each battery is not connected to each other.

3. The negatives of the 2 batteries are connected to each other, as well as the main ground?

Here's a diagram, am I way off?

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Old 08-10-2013
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Re: Another Battery Hookup Question

Your either/neither/ both switch has to be on both for that to work fully. Others will be along soon to explain.
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Old 08-10-2013
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Re: Another Battery Hookup Question

So the positive would be connected. So how would it need to be to charge correctly?
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Old 08-10-2013
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Re: Another Battery Hookup Question

You can keep it simple by running the solar charge controller to the house bank (#2). That will only charge #2, unless you put the switch to the "both" position, at which point it will charge both.

But unless you are doing separate switching, there's no really simple way to charge them both from one controller while still keeping them isolated.

If you want to add more stuff, sure, you could charge #1, add in a battery combiner, and then that would connect #2 automatically to let it charge up whenever #1 was full (engine running or solar topped up) but that's going to be an extra $100+.
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Old 08-12-2013
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Re: Another Battery Hookup Question

Another thing to check/beware: my solar charge controller (a BlueSky SB3024IL) has SEPARATE negative connections for battery and panels - they must not be connected together or reversed (used for current monitoring I believe). Check your manual.
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Old 08-12-2013
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Re: Another Battery Hookup Question

If you have isolated batteries you could use a MorningStar SunSaver Duo which is basically two controllers in one. You will have two sets of wires. One set to each battery.

I don't have the Duo model without the remote meter showed on my website but it is available. In the past, the one with a remote meter has been the most popular. MorningStar has told me that it will also work if you have the switch turned to both batteries.

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Originally Posted by JoeLena View Post
I know, I know; there are a lot of these questions, but none gave me the feeling I knew with certainty how to hook up the batteries correctly, and I would like to get this right.

Hooking up 2 group 27 batteries and using a solar panel with a charge controller.

1. From the controller, do I connect the red lead to red on one battery and the black to the other one?

2. The positive from each battery only goes to the switch, the positives from each battery is not connected to each other.

3. The negatives of the 2 batteries are connected to each other, as well as the main ground?

Here's a diagram, am I way off?


Last edited by mdbee; 08-12-2013 at 11:35 PM.
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Old 08-13-2013
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Re: Another Battery Hookup Question

Put a combiner between the two batteries (like THIS). Charging them by switching the main switch to BOTH isn't a good idea, as the batteries are bound to have different potentials.
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