We used one short term when the Converter/Charger failed to charge. We were on a 6 week trip in our Class C and had about 4 other issues before the Converter stopped charging. I didn't want to be bothered with it, so I just used a 12 amp/2 amp/75 amp charger. We were at the same campground for the remainder of the trip, so I charged the battery overnight the first night on 12 amp setting until full, then kept it on 2 amps the remainder of the trip. It kept the battery charged enough. Our battery compartment was under a slide, so the charger stayed under the slide as well, safe from rain.
We ran the fridge and hot water heater on electric the whole trip, so it was really just lights and vent fans using battery. After we got home, I replaced the Converter/Charger.
-Michael
