VEVOR 50W 12V Solar Battery Charger Maintainer, Mono Solar Panel Trickle Battery Charger with Upgraded MPPT Controller, IP65 Waterproof for Car Boat RV Trailer Flat Rooftop (Bracket Not Included)Smart Charging ControllerBuilt to LastEasy to ConnectWide ApplicationsHigher Conversion EfficiencyHigh CompatibilityCompatible Battery Voltage: 12V,Solar Panel Dimensions: 23 x 29.5 x 0.98 in / 585 x 495 x 25 mm,Maximum Power: 50W,Solar Cell: Monocrystalline Silicon,Waterproof Rating: IP65,Controller Type: External MPPT Controller,Item Model Number: 50W,Surface Material: High-Transparency Tempered Glass,Max Power Voltage: 20V,Net Weight: 6.39 lbs / 2.9 kg