15 Watt Solar Charger/Maintainer with SPC-7A Charge Controller SPC-7A Charge Controller is included, for extra overcharge protection. Extends battery life. Works in cloudy conditions. Water-. Environmentally safe. Minimal maintenance. Built-in blocking diode protects against discharge at night. 96-inch cable allows you to mount the unit almost anywhere on your vehicle. Pre- holes and mounting screws included, for easy installation. Ideal for boats, cars, motorcycles, snowmobiles, trucks, RVs, and more. Contents:. (1) Schumacher SP-1500 Solar Panel. (1) SPC-7A Charge Controller. (1) 12V DC Adaptor. (1) Clamp Adaptor. (4) Mounting Screws SP-1500