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Portable generator running watts
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Gerald J.
Posted 7/2/2006 19:59 (#23605 - in reply to #23583)
Subject: RE: Portable generator running watts


Its hard to be sure without knowing more about the innards of the machinery than the maker lets us know.

Likely a battery discharged down to 11 volts will drag down the 12 volt output and only draw 8 to 12 amps. I suspect that 12 volts is left over from exciting the alternator, though in some Honda the DC does everything and the total AC output is from an electronic power inverter.

Hooking up a dead 12 volt battery may draw down the excitation voltage lowering the AC output. It might try to draw more current than the windings can handle and so there's a possiblity it might smoke the generator.

Even that benign lamp load will draw 15 times rated current initially tapering to rated current as the lamps come up to temperature. Its a shorter transient current than the 6 times running current for starting a motor. But the switchs for lamps have to close on it and survive it.

Shaft input power surely is the sum of the load powers plus the excitation power plus the core loss of the generator windings. Plus windage.

Gerald J.
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