This Semi-flexible Solar Panel delivers power foryour boat or RV, and can operate marine electronics or maintain house batteries.They're wafer-thin and light in weight, and flexible enough to bend up to 20 to fit a curved surface. Nature Power Semi-flexible Solar Panels are weather, water and corrosion resistant, so they will stand up to the corrosive environment on a boat or the outside of an RV.This 50-watt panel is light enough to mount on a window with the included suction cups, and durable enough to mount permanently outdoors on a range of vehicles. Eight grommets allow the panel to be attached using line or fasteners. At only 21" x 30", this panel easily fits in a variety of locations.Includes blocking diode. A charge controller is recommended for solar panels 12-watts or above.Key FeaturesUltralight material is paper thin, measuring only .07" (2mm) thickFlexes up to 20 to curve and mold to any roofUp to 2.8A / 50W of output in bright sunCharger is able to keep your 12V batteries topped off enough to run medium-sized loadsPermanent installation without the need to drill holesTemporary installation with included suction cupsWeighs just 2.5 lb.Two-year limited warrantyInstruction Manual