I have the same questions and issues with this converter. The documentation is worthless. I was under the assumption that the charger was multi stage based strictly on my observations.
I notice that when I am plugged into 30 amp shore power at home, my OnePlace center reads amps being used. When I first connect, and with nothing else on, it reads 3 amps. After it charges for a bit, it will drop an amp until eventually reading zero. This occurs over several hours, up to a day if the batteries have been depleted significantly. I had a 2008 Outlook class C that boiled the batteries with a single stage charger in the first 6 months but 3 years into this 2011 Sunova 33c, nary a problem and my coach is plugged in almost always. I check batteries every 6 months and although I have added water, I have not seen the level get near the plates. So, It makes me wonder? Is it possible that there is a different converter in my coach? Winnebago said this was what was in it, maybe I need to pull the panel and see for myself. Any thoughts?