Quote:
Originally Posted by bgschust
It's definitely not the inverter making the noise since that's outside and far away from the breaker panel.
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The inverter itself will not make the noise. Items such as the power bricks for TVs, laptops, and other electronics will hum from the unclean power. I bet the converter is humming as it doesn't like the power from the inverter. In this case, the converter should be off anyway.