retasker(at)optonline.net
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 Posted: Fri Dec 24, 2010 3:36 pm Post subject: Alternator output voltage vs usable voltage at the bus |
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You are correct.
Dick Tasker
Neil Clayton wrote:
| Quote: | 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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