What MarkB_MI stated about gensets and RPMs is not universally correct.
The better higher priced and more efficient units run low RPMs, not high.
One sidenote - high 3600 RPM gensets often do not make perfect AC power either. More often, the lower RPM , higher priced gensets are the ones certified for perfect voltage and sine-wave.
I checked some test specs on small Kubota diesels. On all, 1800 is the opitmal RPMs as long as the horsepower need is satisfied.
Some quick fuel-use specs on gensets. Note the old-tech, 1100 RPM two-stroke-cycle Detroit 2-71 on a Delco genest beats them all. All figures have been adjusted to 1 gallon per hour, to make things easy to read. All amps at 120 VAC.
Isuzu indirect-injected diesel 1800 RPM - 120 amps at 1 gallon per hour
Deere direct-injected diesel 1800 RPM - 110 amps at 1 gallon per hour
Delco-Detroit two-stroke diesel 1100 RPM - 166 amps at 1 gallon per hour
Kubota in-direct injected diesel 1800 RPM - 97 amps at 1 gallon per hour
Perkins in-direct injected diesel 1800 RPM - 108 amps at 1 gallon per hour
Cummins direct-injected diesel 1800 RPM - 119 amps at 1 gallon per hour
Fast run: Air cooled 3600 RPM diesel - 73.5 amps at 1 gallon per hour
Air cooled 3600 RPM gasoline (Honda) - 71 amps at 1 gallon per hour
Air cooled 3600 RPM Natural Gas (Honda) - 82 amps at 1 gallon per hour
Medium run for RV use: Air cooled propane at 2400 RPM - 54 amps at 120 VAC uses 1 gallon per hour
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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