I also have installed the 4045 & love it! Yes, instructions suck & make little sense, at least not to us electrical neophytes. But, Randy is very helpful, although tech support at Progressive Dyn. is not, so much. I cannot hear one little peep from this converter. That fan does not run continuously, I don't think, because I can never hear it when and if it goes on. It has been plugged in to 110 house power continuously, for over a month as I've been working on the GT, in temperatures here in southern Arizona ranging from 100-118.
Judy & Bill