Hi,
The fan may be the converter trying to recharge the "house" battery bank.
Restart may indicate a low voltage situation. My comfort level is 109 volts or above when running the air conditioner.
I love these two items:
kill-a-watt
watt meterOutlet tester.
outlet tester
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.