Use this Sunforce Solar Charging Kit
to charge your 12V batteries with the sun's energy and regulate that power in order to improve your battery's lifespan. This weatherproof solar panel
is great for homes, boats, and RVs for backup or remote power usage. Provides up to 15 watts of clean, free, renewable power. Manufactured from durable ABS plastic and amorphous solar cells. Built-in blocking diode protects battery against discharge at night. Maintenance-free charging kit
is easy to install with 4 pre-cut holes. Includes hardware, 12' wire, battery clamps, CLA adapter, voltage tester, and 7-amp controller. 38"L x 13-1/2"W x 1-1/2"H.