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Z-13 Alternator & Starter Wire Size

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Tue Jun 22, 2010 6:53 pm Post subject: Z-13 Alternator & Starter Wire Size

After looking at a copper wire resistance chart and playing with V=DIR, it seems as if the 4AWG callout on Z-13 for the B lead is overkill for a 60 amp alternator and even for the start circuit.



For the alternator, wouldn't  10AWG be sufficient for a 1' run to the starter contactor? Voltage drop= 1' x 60a x .00118, or .07v



And could the 2'start circuit for my 1.5kw starter (125a (at) 12v) be comfortable with losing .12v using 6awg  .12v=1' x 125a x .000465?



Just checking with you all to make sure that I'm not overlooking something in trying to keep my plane on a diet.



John

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