when should a powermax pm4b drop into float mode

The 93 indicates PF corrected while the 85 goes with the lower amp, non-PF corrected ones. So with the 75, VA should = watts but the watts given for the lower amp ones would actually be higher in VA than the watts listed.

With the unit on a Honda gen, the VA would be that, but with an inverter you have the inverter's efficiency to consider drawing battery amps to make 120v output. "So the divide by 10 rule"