I use the battery tender all winter long. I have sealed batteries and I also have a knife switch that disconnects the camper loads from the batteries for long term storage. I feel the battery tender has more "smarts" in it than the solar charger does to prevent any overcharging. However the 5watt solar charger probably won't do any overcharging since 5 watts is really quite small.
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2011, Model 2720SD, 13.5k btu Dometic Low Profile Penguin II with a user installed Easy-Start modification, "Jack" TV Antenna, 15" Goodyear Marathon 225/75R15D Tires on Alloy Wheels, Swing Hitch, Electric Tongue Jack, Front Window (now an option). Powered with a Honda 2000i or 3000 handi (depending on the weather) generator when dry camping. Powered with two 6V Trojan T145 batteries when I need to run silent and deep. TV = 2016 Toyota Tacoma Double Cab w/ WDH.
Home Port: Western New York.
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