Hi Lee,
Copper resistance goes up by about 0.4% per degree Centigrate.
I extrapolated 0.4 Ohms for 56 ft of 18AWG copper wire at 60 degrees Centigrate.
Yes your point taken on contact corrosion, contacts must be good. Not so clear
on how copper
gets brittle even if it cools slowly, but I will put it in the back of my head.
My point with all this is to encourage our readers to question all blanket
statements about safety.
Always make an effort to increase your knowledge about why things behave the
way they do.
Have a great fourth of July weekend.
Ahmet
SV8827
> From: [email protected]
> To: [email protected]
> Date: Tue, 30 Jun 2009 07:37:08 -0400
> Subject: Re: [Liveaboard] 12 to 24 volts
>
>
>
>
> What resistance did you calculate for the 50' of 18 GA wire? If the wire
> is allowed to heat much at all, the connections become problematic,
> accellerating corossion and possibly making the copper brittle. The
> question is how much heat in worst case.
> Lee Haefele
>
> I appreciate your sincerity Jim.
> Yes you are right. One cannot even "begin to explain" wiring without a
> thorough understanding of Ohm's law.
> A quick check of Ben's circuit reveals 50ft of 18AWG wire will limit the
> worse case peak charging current to less than 10A. (One lead-acid battery
> fully discharged, and the other continually kept charged.)
> A 10A fuse in series will insure the wire will.....
>
>
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