It is a 3 stage charger done similarly to a Progressive Dynamics. 5 hours or until 5 amps at 14.4v then 44 hours at 13.6v and then float at 13.2v. Depending on battery bank size, it could be OK or not so OK a charger, I think. No temperature compensation, which is too bad. There are worse out there for sure, and some better. A battery monitor will tell you quickly how well it is doing, and IMO every system should have a monitor on it if possible.