I have an 18K EG4 Inverter that occasionally will produce hum in my breaker panel.
I have isolated and recorded some data showing volts, amps, frequency, PF, watts....
The data was recorded on legs 1 and 2 connected to the last two breakers in the panel.
The inverter was basically in what i consider an idle mode, not charging the battery or back feeding.
When the hum starts it goes thru a cycle similar to two frequencies out of phase. Meaning
the sound gets louder and the softens up. This didn't last for a long time maybe 10 minutes.
I hope this makes it to the techs at EG4. I didn't hook up an oscilloscope to check my phase theory yet.
Pay attention to the PF and Amp readings.
Pics are below.
Cheers,
Matt Crum
