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Old 07-16-2015, 12:18 PM   #1
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Wire size on 12v to 6v battery conversion

Our MH came with three new 12v rv/marine house batteries (55Ah ea.). After just over two years they are getting pretty weak. I am swapping them for two 6v golf cart batteries (226Ah ea.) Should I increase the existing wire gauge between the two batteries when putting them in series? I'm thinking not because the amount of current flowing through will remain minimal.
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Old 07-16-2015, 12:25 PM   #2
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Two answsers
Answser one: Same size as the LARGEST wire currently connected to the batteries (Generally that is the negative wire)

Answer 2 4GA (IF it is larger than 1) Logic behind answer 2:
You can get 4GA jumper wires very inexpensive at your local Auto parts place.. they are used for Starter cables.. Starter solenoid to starter and such.. Lugs pre-attached and ready to connect
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Old 07-16-2015, 02:54 PM   #3
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Quote:
Originally Posted by Okiedoke View Post
Our MH came with three new 12v rv/marine house batteries (55Ah ea.). After just over two years they are getting pretty weak. I am swapping them for two 6v golf cart batteries (226Ah ea.) Should I increase the existing wire gauge between the two batteries when putting them in series? I'm thinking not because the amount of current flowing through will remain minimal.
What size is the wire between the batteries now and why can't you just use this? I use 1 gauge which is what came from the factory, 4 gauge is not big enough in my opinion even though it is used for jumper cables.
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Old 07-16-2015, 05:01 PM   #4
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What size is the wire between the batteries now and why can't you just use this? I use 1 gauge which is what came from the factory, 4 gauge is not big enough in my opinion even though it is used for jumper cables.
agreed. 4ga is not enough. my battery cables from the manufacturer were 2/0. when i connected my batteries, then with trojans and now on lithium, i used 2/0. if you think the current won't be that high, think again - a few days ago when wife used convection microwave (850w) and an electric cooker (1200w) simultaneously, a 150a fuse was blown. thank god i added the fuse in the battery output line when i upgraded the batteries.
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Old 07-16-2015, 05:05 PM   #5
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What size is the wire between the batteries now and why can't you just use this? I use 1 gauge which is what came from the factory, 4 gauge is not big enough in my opinion even though it is used for jumper cables.
The wires connecting the 12 volts were a mix of 2 and 4. I ask because of a video I watched of "Mr. Battery" saying to connect the two 6 volt batteries with a heavy cable. It looked to be at least a 0. I'd never heard that before. But then I got to thinking about the 45 amp converter we have charging two batteries in series rather than three batteries in parallel. Obviously, I am not an electrical engineer.
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Old 07-16-2015, 05:08 PM   #6
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agreed. 4ga is not enough. my battery cables from the manufacturer were 2/0. when i connected my batteries, then with trojan and now on lithium, i used 2/0. if you think the current won't be that high, think again - a few days ago when wife used convection microwave (850w) and an electric cooker (1200w) simultaneously, a 150a fuse was blown. thank god i added the fuse in the battery output line when i switched the batteries.
I'm probably okay then, as our only inverter is to the entertainment equipment.
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