Is this a normal humm when the fan is running in the mp and it is charging at 60 amps?
The load on ups out is minimal.
I think it is ok but not shure.
Thanks.
Thanks.
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It’s normal for this inverter topology.
It will be less or almost nonexistent if the case was from an non ferrous material like aluminium, but hey, money, money, money… 
Hee, thanks.
The MP is in the barn so in the house i can’t hear it. Was just wandering if my fan is starting to fail or so, but i think i would get an overtemperature warning in that case
Thanks for the reaction.
No problem, what I was trying to say is that most of the hum is because of the big transformer under load resonating in that big metal cage…