Use the most powerful energy source in the solar system to charge and maintain car, boat, motorcycle, and power sports batteries. Schumacher’s SA1589 5W 12V Solar Battery Charger and Maintainer is portable and compact, allowing you to charge your vehicle’s battery off-grid and far from civilization. The SA1589 features three built-in monocrystalline solar panels that convert the sun’s energy into up to 5W of power to trickle charge and maintain 12V batteries. With 5W of power users can keep their batteries in optimum condition and fully charged. You can even use the Schumacher SA1589 for charging mobile devices through its built-in 1A USB port. And with a water-resistant design a little moisture or rain won’t damage the unit.