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Old 04-09-2016, 10:17 AM   #1
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Need help on wiring inverter and charger to 4 six volt batteries

I have a new bank of Trojans, T-105. I have 4 six volt batteries, I picked them up in Florida for $100 bucks apiece. I am hooking up a 40amp charger plus a 3000 watt inverter, all hard wired. This bank will be just for microwave and tv. I have a residential refrigerator and a separate bank of batteries for the refrigerator. On some of the wiring to the batteries I will not be able to hook all the cables to the right post. Would it be okay to bolt some of the cables together. I could drill a hole in a cable end and bolt them together right at the post. Would it be worth it to install a inline fuse on the positive side? On the inverter I have 2 positive cables and 2 negative cables. I have did this before about eight years ago but the batteries were brought from Sam's and I had more post to work with. Any help would be appreciated


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Old 04-09-2016, 10:20 AM   #2
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Oh dear I'm not to bright I forgot to attach the pictures Click image for larger version

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Old 04-09-2016, 12:01 PM   #3
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If you never charge them in parallel, you are fine, otherwise you have to find a way for the negative cables to be the same length to both sets of 6V batteries. Right now if you put the negative on one, the other will have an additional 2 feet of cable and that will prevent it from sharing the charge perfectly with the other bank.

Way too many switches for my taste. You don't need to switch both the negatives and the positives, the positives would be fine. You can put a catastrophic fuse in the singe negative return. I would also invest in a roll of red electrical tape so that there is no question if a feed is positive or negative...
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Old 04-09-2016, 12:20 PM   #4
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Those batteries can't be wired right.

The two load wires are on two negative posts and the long wire on the right is connecting two positive posts together.

To fix this, move the red load wire to the positive post on the right lower battery and the long wire from that post to where the red wire is now.

That will give you 4 6 volt batteries wired in parallel.

The graphic is for 6 - 6 volt batteries, but the concept is similar.
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Old 04-09-2016, 12:29 PM   #5
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Unless I am missing something, you are complicating it for yourself. Read this FAQ (ZRD FAQ - Schematics) on how to wire up a battery bank. One of the pics is here. Once I get my TT, I'll post pics of my install. I will be able to be total off-grid capable when desired/needed.

The following pic shows Q6 of 6vdc batteries in series/parallel wiring allowing 12Vdc use and charging.

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Old 04-09-2016, 12:33 PM   #6
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Originally Posted by Herk7769 View Post
Those batteries can't be wired right.

The two load wires are on two negative posts and the long wire on the right is connecting two positive posts together.

To make 12 volts out of two six volt batteries is to first wire positive to negative to make 12 volts then to join the four together you hook positive to positive and negative to negative


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Old 04-09-2016, 12:35 PM   #7
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........... Eek.

Too many switches, no fuses, all wires look the same. Fire hazard.


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Old 04-09-2016, 12:39 PM   #8
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Originally Posted by 25FKS View Post
Unless I am missing something, you are complicating it for yourself. Read this FAQ (ZRD FAQ - Schematics) on how to wire up a battery bank. One of the pics is here. Once I get my TT, I'll post pics of my install. I will be able to be total off-grid capable when desired/needed.

The following pic shows Q6 of 6vdc batteries in series/parallel wiring allowing 12Vdc use and charging.


I have my battery bank wired the same way, one of my cables just has the wrong color on the end


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Old 04-09-2016, 12:39 PM   #9
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To make 12 volts out of two six volt batteries is to first wire positive to negative to make 12 volts then to join the four together you hook positive to positive and negative to negative


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Yup.

Look at the photo of how the wires are being run.
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Old 04-09-2016, 01:42 PM   #10
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Yup.

Look at the photo of how the wires are being run.

I looked and mine are wired the same, one just happens to have a red end on it that's hooked up to the negative side


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