I did the same thing for years, worked great. Just shut off the converter, air conditioning, water heater and refrigerator at the circuit breaker. Most converters share a breaker with another branch circuit so it may be desirable to install another breaker just for the converter. I hardwired a 30 amp receptacle off my inverter thru the floor and just pulled my shore cable to it and plugged it right in. I did that for about 4 years before I installed a manual transfer switch, no more going out in the rain, all I do is flip a switch that switches power supplies and shuts off the circuits I don't want running off the inverter.