Help! Power Converter stopped charging batteries.

Thanks for the suggestion, I will check the back of the unit.

I have two Duracell 6v golf cart batteries from Sam's Club wired in series, and the old converter worked fine for my needs. How much better will a new converter be? I also plan on adding either one or two 24v solar panels with an MPPT charge controller, as well as a pure sine inverter.. How much will I benefit from a new unit? I see a deal on a Progressive Dynamics PD4635V.