Xantrex Truecharge 20+. Took 90 minutes to get the old charger out and the new one in. I still have to do a few more minor things before the installation is totally complete.Now, Lets see if my batteries will recover or if I have to buy new ones. These are flooded batteries. What would be the nominal maintenance cycle for adding water? It has been a long time since I've used flooded batteries.Just FYI, I have been having to add water just about every two weeks. The old charger was probably killing my batteries. Hope they recover. I'll check the levels with a hydrometer later.