To prichardson: Yes, I am taking readings on the inside of my RV from a volt meter I have plugged into an outlet. It's not about the actual number but more about the amount of decrease in volts. Again I was expecting the fan to come on then the compressor but it seems like both are coming on at once. If it is only a 5 volt drop when both come on I'm assuming that is OK and the unit is doing what it is designed to do.
To 3 Tons: I will try your suggestions and give the unit some time to "learn" my A/C. the real test, and what I installed the unit for, is when I use my generator.