Xantrex is a piece of garbage. I bought a charger last season on my vacation because my 21 year old charger bit the dust. The Xantrax was the only one around at the time and I wanted to finish my vacay. The Xantrax lasted 10 minutes. I got another unit and installed it and it seemed to work, however when I got back to my dock after vacation and had constant power for a week, the Xantrex boiled a perfectly good house battery dry. When I say dry I mean dry. So much for being a smart charger. The poisonous off gas filled my boat from top to bottom. I fought with West Marine and Xantrax for a full refund. I bought a Victron Centaur. A far superior unit, and didn't cost me that much more in $.
Shel