Yep.... It hums...
Just got done installing the Progressive industries hardwired 30amp unit... luckily I installed it in the electrical bay. When I first plugged it in, it was silent. I went into the rv and turned on...
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I mounted our 30 amp PI EMS under a dinette seat next to the converter/panel. It never ever makes an audible hum and it's screwed directly to wood. Some simple rubber grommets from the hardware store may be all that's needed to provide enough noise reduction. Or just turn on the furnace or AC to mask the hum. :R
