I have a 5000 watt (6250 max) portable generator with a Tecumseh 10hp flat head
engine. With the
generator running with no load the rpm is about 3610-3620rpm. With a heavy load
on it the rpm drops
to 3490-3520 rpm. Is this normal or will the lower rpm cause low voltage ????
It sounds like you have one similar to what I have. Most portable
generators are not very voltage/frequency stable. They rely on simple
mechanical governors to hold the speed constant. They should normally run
at 3600 rpm to generate the 60 hz frequency and the rated voltage. Anything
faster or slower will raise or lower the voltage and frequency.
Most house hold devices should be ok from about 110 to 125 volts.
I would not worry about what you are seeing and it is normal for that
Yes, and if the voltage is dropping *below* about 110 then you either have
overloaded the generator or it has a Tecumseh 10HP POS engine ;-). In
general these kinds of generators will put out about 125 volts with no load
so if you (OP) have a voltmeter you can check it with and without load. If
that's the HM100 then, if I recall correctly, you need a 3/8" open end
wrench or deep socket to adjust the engine speed.
3600 rpm = 60 hz 120v. No load setting to 125 or so rpm gives room for
a normal swing in voltage. What is your V at 3520, you dont want to go
to low as hz lowers also. There is a safe range you want to stay in.
It is normal to drop and yes it lowers Voltage and Hz. Go to low or
high and some things can be damaged
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