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The Schumacher SP-1500 Solar Battery Charger and Maintainer harnesses the power of the sun to maintain batteries in boats, cars, motorcycles, snowmobiles, trucks, RVs, and more. Featuring a built-in panel that uses amorphous solar technology to convert sunlight into usable energy, the maintainer can be easily charged in daylight and even operates under cloudy conditions. The maintainer requires no outside electricity source and can deliver a 15W charge to 12V acid-lead batteries. Includes charger, 12V DC adapter, clamp adapter, mounting screws, and user manual plus the Schumacher SPC-7A charge controller for added overcharge protection.