Instapark SP Series Mono-crystalline Photovoltaic PV Solar Panel Charge Controller NOT Included, 50 Watt Maximum Power Voltage: 18.39V; Open Circuit Voltage: 22.5V; Maximum Power Current: 2.72A Cable lengths : 3' Product Dimensions: 28.4 X 1.5 X 21.5 inches; 21 pounds Designed for RVs, cabins, homes, boats, back-up and remote power use, and more Monocrystalline solar charging kit provides up to 50 watts of clean, free, renewable power