Sorry been away for a time trying to make a living.
The previous replies are very helpful. I pulled the Maganatek 40 amp converter and put it through a killawatt and it drew 52 watts only. So I turned the Norcold refer to off and it still froze everything for two days. Needs a thermostat, but I am thinking about pianotuna suggestion to just replace it with a compact 120v bar fridge. The boy is not a boondocker anyway. Then to replace the converter with a Powermax because the Magnatek buzzes ALL the time. Big Big Thanks to everyone!