I know the article was older, but it was the best one I could find that did not just talk in generalities about the effect of temperature on charging rates.
You will do no harm to the power converter. I operate mine often with no battery in place and on dealer lots we almost never had batteries in place until a unit was sold. The charger does not care if it finds a battery online.
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC