I recently acquired an older 1992 Dutchmen 180 and it has the Magnetek 6300 in it. While researching a replacement I compared some models. Magnetek has modern upgrade kits that are easy to do and designed for the older models like mine and they have some for the 7000 series and others as well. However it is strictly an upgrade to the system for the same kind of battery and the prices are within 20-30 bucks of the Progressive Dynamics products. I would strongly suggest ( not affiliated with PD just a satisfied customer ) that you get the Progressive Dynamics to upgrade what you have. They have several different kits for different makes and should have what you need. High quality construction. The best part? The newer models that have an L after the part number will not only handle LITHIUM batteries well, it is capable of properly charging other popular battery types. They are the cats meow. I ordered one with the optional remote control, so I can manually choose what charging type is happening at any time without opening the case up, so when I am using solar or a generator I can fine tune. Mine was 207 bucks plus another 25 for the remote. My plans are for a solar bank on the roof but for now I am either going to boondock with a Honda inverter generator or be at a park hooked to shore power.
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