The 7 pin adapter works with a trailer's existing 7 pin plug for the most convenient and accessible battery charging method. Quickly connect any of our PORTABLE SOLAR KITS to the 7 pin trailer connector. On one end, plug in your trailer's 7 pin connector while the other end easily plugs into an anderson style connector. The 7 pin connector comes with a dust protector cap. Consider getting the 30 FOOT ANDERSON EXTENSION CABLE to extend the distance of where the solar panel is placed when your mobile home is parked in the shade.