Wiring from 12v Batteries to Converter in Casita - Fiberglass RV


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Old 03-23-2013, 12:12 PM   #1
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Wiring from 12v Batteries to Converter in Casita

After reading Handy Bob we want to hook up the 2 golf cart batteries and run to the back of the Casita to the converter. It was recommended to use #2 battery cable. the distance is 15 feet. Can't find the wire anywhere...or is there another option to hook the converter up? Is a 2/O or 4/O wire heavy enough to carry the voltage that distance?
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Old 03-23-2013, 12:18 PM   #2
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After reading Handy Bob we want to hook up the 2 golf cart batteries and run to the back of the Casita to the converter. It was recommended to use #2 battery cable. the distance is 15 feet. Can't find the wire anywhere...or is there another option to hook the converter up? Is a 2/O or 4/O wire heavy enough to carry the voltage that distance?
Our local NAPA auto parts store makes custom wire by the foot, and crimps any style ends on it that you would like.
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Old 03-23-2013, 12:21 PM   #3
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Marine stores usually have a good selection of wires but you have to watch the price.
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Old 03-23-2013, 12:25 PM   #4
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Is 2/O the way to go?
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Old 03-23-2013, 12:36 PM   #5
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2/0 should be plenty big. Is this wire to power some 12 volt lights and recharge the battery? Look at big trucks, they don't use that heavy a wire off a 80 amp alternator. Unless you are powering a 12 volt starter or liftgate motor, 2/0 is way oversize.
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Old 03-23-2013, 12:40 PM   #6
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We are running two 2volt batteries that we box on the front hitch to the converter - so does the 15ft distance matter on wire guage?
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Old 03-23-2013, 12:53 PM   #7
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We are running two 2volt batteries that we box on the front hitch to the converter - so does the 15ft distance matter on wire gauge?
Do you mean converter or inverter? If you don't know the difference we need to restart the conversation, as it makes a huge difference.
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Old 03-23-2013, 01:10 PM   #8
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Running the wire under the camper from 2 12volt batteries on trailer hitch to the back converter.
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Old 03-23-2013, 01:14 PM   #9
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Do you mean converter or inverter? If you don't know the difference we need to restart the conversation, as it makes a huge difference.
Yes it does! Inverters require large diameter wires to handle the large amp draws under worst-case conditions. I ran 3 gauge wire about 6 feet to my 2500 watt inverter as required in my owner's manual.

On the other hand, converters require much smaller wiring because they just keep the batteries charged while you are plugged in and sometimes provide the feed-wire from the battery to the trailer distribution panel. This wire from my batteries to the converter is I believe 10 or 12 gauge...no bigger.

Good luck!
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Old 03-23-2013, 01:23 PM   #10
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Thomas,
I guess the #2 battery cable wire will be sufficient enough then?
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Old 03-23-2013, 01:24 PM   #11
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Thomas,
I guess the #2 battery cable wire will be sufficient enough then?
It depends. Inverter or converter?
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Old 03-23-2013, 01:26 PM   #12
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2/0 would be good for a big inverter.
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Old 03-23-2013, 01:27 PM   #13
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2/0 would be good for a big inverter.
And if it is a converter, total overkill.
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Old 03-23-2013, 01:29 PM   #14
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This is what you need to look at.

http://www.engineeringtoolbox.com/am...uge-d_730.html

You need to know the distance between your battery and converter, and converter amp output. I highly doubt 10 gauge is close to ok. With my new converter, I got 4 gauge wire from Greg's marine wire supply online. Remember, if you battery is fairly low, you can have a lot of current going to it.

I emailed progressive dynamics about it:

"Yes the wire should be rated for the full amperage of the converter and fuse (which should be close to the battery to protect the wire) whichever is higher.

I cannot recomend wire sizes due to liability issues.

Wires should be sized according to the RVIA / NEC codes.

For a rough guide see:
http://www.powerstream.com/Wire_Size.htm?nowritefs for voltage drops using different
gauges verses distance/load


Service Department
Progressive Dynamics"

P.S. 2/0 or 4/0 is much larger than the 2 gauge you mentioned. It starts with the higher the number, the thinner the wire. When you hit 0 and go to the x/0 sizes, the larger the number, the bigger.
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