I think there is a misunderstanding, the original post stated that he had an ac INVERTER running all the time, that's different from the AC Converter on the Sundancer.
To see how much juice you use you can look at the panel and see how many AC Amps you are drawing when all is kind of stationary
Well.....The AC converter does not put motors then 10A in any of the 3 batteries. If you plug in a 150W item into your inverter it will take about 14A out so you end up drawing 4A out of your battery and discharging it. If you plug the item you have in your inverter into a 110 outlet whole on...
If you are running an inverter the 10A that the charger puts out to each battery may be way less then the current the inverter takes out so you will not see a charging voltage.