The solar battery charger is made of tempered solar glass with a corrosion-resistant aluminum alloy mounting frame. The tempered glass is high-strength and impact-resistant, well-built, and can work for many years. The 4 corners are also equipped with a fall jacket to better protect the glass panel, with no risk of shattering. During installation, the safety is protected from scratches. The high efficiency monocrystalline solar cell is ideal for RV, camping, off-grid solar panel system, caravan, boat, green house solar panel system, solar pump watering system etc. As long as you are in a sunny place, you can use this solar panel quickly and easily. 220W Solar Panel: Solar Cell: Monocrystalline Maximum Power: 220 W Open Circuit Voltage (Voc): 23 V Short Circuit Current (Isc): 14 A Maximum Operating Voltage(Vmp) 18 V Maximum Operating Current(Imp) 13 A Folded Size: 22.5 x 23.3 x 4.3 inches Unfold Size: 90.3 x 23.3 x 1 inches Gross Weight: 9.2 kg/ 20.28 lbs Features: Built with strong tempered glass and aluminum frame. Withstand high winds and snow loads, corrosion-resistant aluminum frame for extended outdoor use.Folding design minimizes in size, allows the solar panel can be easy to carry around, or stored in any gap in your RV or van without taking much space. Off-grid power supply able to carry anywhere.