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Alternator output voltage vs usable voltage at the bus

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harvey4(at)earthlink.net
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Posted: Fri Dec 24, 2010 2:07 pm Post subject: Alternator output voltage vs usable voltage at the bus

Is my reasoning correct here?



 On my pusher, the internally regulated alternator puts about 13+ volts on the bus behind the panel.

 If there is 10 feet of #6 wire between the alternator and the battery (alternator, all the way forward to the 40A panel breaker, then to the bus).



 10 feet of #6 wire at 0.004 mOhms/foot pulling 15 amps of current would see a voltage drop of 10 x 0.004 x 15 = 0.6 volt drop. Add a few more losses along the route and 13v is a reasonable expectation at the bus. So if the electrons start out their journey from the alternator at 14 volts, I'd see about 13.0 volts on the bus. 



 Furthermore, if I externally regulated the alternator using +14 bus voltage as the target voltage, the regulator would compensate for the line voltage drop, and I'd see 14+ volts at the bus?



 Right, or is this Mech Engineer counting electrons wrong?



 Thanks

 Neil



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