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| Re: [GMCnet] battery isolator wire [message #340691 is a reply to message #340690] |
Wed, 06 February 2019 15:31   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Dean,
Frankly, on that long a run, you can use 'most any size you want. The
resistance of a smaller wire will limit the charge current, but since
you're probably not interested in fast charging. BUT, you'd better include
a low current self-resetting circuit breaker up front just in case the rear
battery is dead and you try to start the Onan. Now, if you want fast
charging, and the ability to start the Onan, you'd better use large
diameter wire, something like #2 or bigger. And in that case, you'd better
put a high current CB in it up front to protect everything from a short
along that long wire. In either case, you'll need a CB similar to the one
up front to protect the rear battery from shorts too. Check the Onan
starter current draw and a wire size/current chart to refine my WAG.
Ain't nuthin' simple!
Ken H.
On Wed, Feb 6, 2019 at 3:33 PM Dean Hanson
wrote:
> I plan to run a new wire from the isolator to the rear battery on a 75
> Avion
> coach. Anyone have a suggestion as to the wire size I need to use?
> Obviously
> to charge rear generator/house battery.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] battery isolator wire [message #340696 is a reply to message #340690] |
Wed, 06 February 2019 20:40 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Senior Member |
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Inside the 30 amp UPS unit I have been learning about it has several instances of multiple wires attached to single terminals. Is this method of gaining current capability acceptable in the kind of high amp, low voltage scenario of the front to back battery run?
Example: I found some underground 6/3 copper wire clearanced at Lowes...If I can terminate all three (or even four included ground) together, would they act like a #1 or #2 AWG electrically?
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: [GMCnet] battery isolator wire [message #340700 is a reply to message #340690] |
Thu, 07 February 2019 00:02 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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What size wire did Avion use when they built the coach? Use the same size they used. Why are you changing it in the first place?
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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