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Old 01-22-2022, 12:48 PM   #1
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Extending battery connect cables

I need to relocate my battery bay from under my steps to a storage bay 3-4 feet away. Assuming I'm going to have a maximum of 400 AH of batteries in a 12v system, what's the best and safest way to extend my main positive and negative cables which are currently connected to my batteries? Is a bus bar the way to go? Seems like a lot of connections on most of them and I only need two: one for the existing cables, and one each for my extended cable. Any advice as to the best way to make these connections is greatly appreciated.
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Old 01-22-2022, 02:20 PM   #2
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This may not suffice for everyone but being the country boy I am, I'd buy the equivalent sized cable in the correct length and install, or have installed, ring terminals at each end. Then use a nut and a bolt to connect to the existing and maybe something like Scotch Supper 88 or Extra Heavy Duty electrical tape(10 mil) to insulate. Could install a plastic electrical box and house the connection inside it if you wanted. I would want to secure the cabling for a cleaner install and to keep things from moving around.
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Old 01-22-2022, 02:35 PM   #3
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https://www.bluesea.com/products/cat...ost_Connectors
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Old 01-22-2022, 02:39 PM   #4
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The Best and Safest way is to get a longer cable of the proper gauge with lugs on both ends.
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Old 01-22-2022, 03:07 PM   #5
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Welding cable with the proper ends.
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Old 01-22-2022, 04:02 PM   #6
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Yup, if you have a legit hardware store they usually have it by the foot and ends you can soldered on. Thatís your best option, if not look for 0 gauge wire and go from there on crimp terminals.
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Old 01-22-2022, 04:10 PM   #7
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s battery compartments supposed to be aired>
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Old 01-22-2022, 04:30 PM   #8
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You probably will only need a longer positive cable to reach the positive distribution point and a short negative to ground to the frame.
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Old 01-22-2022, 05:03 PM   #9
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Quote:
Originally Posted by RVAJeff View Post
I need to relocate my battery bay from under my steps to a storage bay 3-4 feet away. Assuming I'm going to have a maximum of 400 AH of batteries in a 12v system, what's the best and safest way to extend my main positive and negative cables which are currently connected to my batteries? Is a bus bar the way to go? Seems like a lot of connections on most of them and I only need two: one for the existing cables, and one each for my extended cable. Any advice as to the best way to make these connections is greatly appreciated.
A little vague, but is it only the main pos. & neg. leads (2 cables) you need extended or will you need a way to connect the other cables that were previously also connected to the batteries? i.e. generator, hyd. pump, house 12V fuse panel...
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Old 01-22-2022, 06:19 PM   #10
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BlueSea makes such quality stuff.

OP, if you are planning other additions like solar and/or an inverter/charger, then I suggest you look at larger bus bars and carefully plan where things like batteries, solar charge controller, inverter, etc will go . . . all those wires add up.

For quality battery cable, I suggest Batterycablesusa.com where you can buy almost any size cable by the foot with or without end connectors.
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Old 01-22-2022, 10:52 PM   #11
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s battery compartments supposed to be aired>
May be wrong but I'm thinking the OP wants to install lithium.
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Old 01-23-2022, 05:58 AM   #12
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Best is to replace cables with ones the correct size. Here's a good source for replacement cables.

https://www.batterycablesusa.com/
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Old 01-23-2022, 06:14 AM   #13
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s battery compartments supposed to be aired>

Unless they are AGM batteries.


No experience with Li batteries, so don't know about them.
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Old 01-23-2022, 08:08 AM   #14
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Every time you make a mechanical connection on a wire, you have are adding another point of failure. Just use a new cable of the proper length.
Just to be safe, get larger gauge wire, not much difference in cost. . The manufacturers use the minimum gauge they can get away with.
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