It sounds like your converter is putting out lots of power to something, e.g., a bad battery. The heavy load means your converter is drawing a lot of power from your AC power source and when combined with your air conditioner’s current load, it ends up tripping your main breaker.
You can disconnect your battery and see if he humming goes away. If so, then you only need a new battery.
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2015 Wildcat 282 RKX
2011 F350 Lariat, 6.7 L. Diesel, 8 ft., SRW, Reese R20
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