There are many good charge controllers on the market. I was about to buy another one when the unique feature of this one caught my attention. This controller can charge two different battery packs. You connect your house batteries to the battery 1 terminals and the engine battery to the battery 2 terminals. Once the main battery or batteries are charged, the controller will charge your engine batteries. If you leave your van parked for long periods of time, GoPower will keep the engine battery charged without you having to start the van from time to time to keep the battery charged. Another bonus: the unit fits in the hole my Specialty Concepts Mark 20 was in and the mounting screws fit the old holes perfectly. I currently only have 1 solar panel but it keeps all the batteries perfectly charged.
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