Monocrystalline solar charger 15W for boat car RV waterproof black1、High Efficiency: Solar panel can efficiently convert solar energy, has high charging efficiency, and achieves optimal charging in a limited space. 2、Long Lifespan: The panel is made of highly efficient monocrystalline silicon, which generates more electricity in full sunlight, prevents weathering and wear, waterproof, shock absorption and high temperature resistant, having long service life. 3、Stable Suction Cup: The kit includes 4pcs suction cups, which can play a better fixing role to prevent outdoor solar panel from loosening and falling. 4、Independent Power Supply: Solar panels can convert sunlight into electricity without relying on conventional power supplies, can provide independent power supply, allowing to have reliable power in areas without grid access. 5、Wide Application: Widely used in batteries for motorcycles, boat, tractor, trailer, truck, RV etc. Also be used for gate openers, electric fences, chicken coops, sheds, mobile phone, power bank,and lights