Test the connector. It's likely already "12v hot". If so, it's designed to take a low amp 12v input from a panel that has a "built in" converter, similar to the battery charging panel available at Harbor Freight, Northern Tool, or many other suppliers. Not for heavy duty solar-provided electric, but great for day to day maintenance of the parasite loads, without having to plug into 120v.
Be Safe, and Everyone Goes a Home,
2014 RAM Laramie 2500 w/6.7L Cummins Diesel and Automated Safety Hitch
2016 377RLBH Jayco North Point
300W of Suntech Solar w/Rogue MPPT Controller & Xantrex 2000W PSW Inverter