The connection on the side of the trailer is just a convenient way to hook up a solar panel, as you don't have to pop the top off the battery box, the batteries are wired to that receptacle. You will require three things: a portable solar panel (I bought a Renogy 100w suitcase), an adaptor to connect the cables from the solar panel to the wall receptacle (that plug is known as an SAE plug), and a charge controller between the batteries and the solar panel, which will control current/voltage going to battery to prevent overcharging. Many panels are available with a charge controller installed on the panel.
Panels that are made by Go Power and Zamp tend to be overpriced although well made. They are marketed towards people who see the sticker and think they have to get that brand. Don't go with some el-cheapo Chinese panel without good customer service, and remember high price doesn't equate to the best panel. I chose Renogy for their reputation and reasonable prices. You just need to make sure the polarity of the pins on the wall receptacle matches the polarity of the panel cables, easy to do with a multimeter set to DC voltage readings. I wouldn't get cables longer than 20 feet, or you will need super heavy gauge (expensive) cables to prevent 'line loss' of voltage.
Most panels have what's called MC4 weatherproof connectors on their cables. You will need an adaptor to SAE if you plan to use that wall inlet.
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2019 Rockwood Geo Pro G19FD w/off road package
2015 Ford F150 XLT Super Cab 4x4 V8
Yes, I drink the water!
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