Onan frequency variation

Derick Gates SM2K #400 Brava

Hi all,

I recently installed meters on my 230 volt panel and have been using them to monitor the volts, amps and frequency of both shore power and the generator.  Today, one of my crew noticed that the generator was unexpectedly putting out at much to high a frequency (75 Hz).  We turned off the microwave he was using, but left the 100 amp and 30 amp chargers going.  The frequency settled down to the normal 50Hz.

Not understanding how a microwave could affect the frequency put out by the generator, we did several experiments and found that the frequency began to fluctuate under high loads, and the microwave was not part of the issue.  Later on, high loads had no impact on the frequency, so the problem seems to be intermittent.  Has anyone else experienced this issue?

Derick Gates

SM2K#400 Brava

Currently at Pigeon Islands, Guadeloupe

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