I only tried it once and it seemed to do what I wanted charging my boat batteries I have a 3 bank charger that uses 700 watts it seemed to charge them in 3 hours the charger will drop down in wattage use as the batteries get near full charge. if it wasn't for the way the charger works it wouldn't have enough watt hours in the generator to do this task. ( (lithium batteries) it was down to 25% from a full charge . this is for when I'm boon docking fishing. charging the unit with solar will take longer unless I use my trailer solar to help in charging the generator.
