SOLPERK Solar Panel Kit 20W 12V Solar Battery Trickle Charger Maintainer + Upgrade Controller + Adjustable Mount Bracket for Boat Car RV Motorcycle

Outstanding Quality20W solar panel adopts well-built monocrystalline cells with high conversion efficiency up to 24%. Using Tempered glass weatherproof film and plus aluminum frame for excellent extended outdoor use which can withstand storms for more than 10 years.Waterproof controller Improved waterproof case eliminates the problem of controller water failure. Advanced PWM algorithm can fully protect the battery: under/over voltage output overload short circuit and anti-back connect protections. It can greatly enhances 20% charging efficiency with no additional self power consumption.