The Sunsei Solar 130-watt 16.5-volt charger is an ideal back-up power source for cabins, RVs, and boats. This powerful, weatherproof solar panel provides reliable, renewable energy as an alternative to noisy and expensive diesel, propane, and gas generators. It provides power all year round when exposed to daylight. The solar panel charges multiple batteries at once and is designed to work with your vehicle or cabin’s electrical system.