when should a powermax pm4b drop into float mode

BFL has mentioned several times that generators should be rated in VA's, not Watts

...I'm trying to determine how much charger I can use, using the Honda eu2000i, rated at 13.3a / 1600w:

If the pm-45 is pulling about 10a, and 800w, according to the kill-a-watt meter, when charging at 14v and 45a, should I consider this as 10a out of 13.3a, or as 800w out of 1600w, or both ???

Likewise, would two 45's be a 20a draw, or a 1600w draw, (or both?)

Thanks!