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Faunsdale, AL | You really need a way to measure frequency accurately. You can buy a multimeter that will do frequency or if you have a 120 volt source, you can buy one of the little KIL-A-WATT devices that displays Volts and Hz as well as Watts for whatever is plugged into the receptacle on the unit. The watt meter isn’t much use for me, but they’re a convenient way to monitor home backup
generators where you have 120 volt receptacles available to plug them into.
If your generator is having to spin faster than synchronous rpm to get voltage up to nominal, that’s a problem. Maybe it’s spot on 60 Hz and 480 volts, but you don’t really know without measuring Hz or rpm accurately.
I try to keep a clamp meter that will do amps, frequency and volts when I’m running a generator that doesn’t have those gauges on its control panel. Doesn’t have to be a Fluke to get the functions you need. For a little extra, you can get the clamp meter that will measure DC amps as well. That’s nice when troubleshooting equipment and vehicle electrical.
300 Ford on propane can be coupled to a generator end as big as 45 kW for a backup of utility service. For continuous duty like you’re using it, probably more appropriate to pull 30-35 kW. Since it’s been pulling it, I’m guessing it’s adequate for the job, but it’s possible that’s why you’re having to rev it up to get the voltage up.
Edited by ccjersey 4/2/2026 20:16
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NAT Irrigation engine question
