UPG 87501 20-Watt Mono-Crystalline Solar Panel Maximum Power Voltage: 18V; Open Circuit Voltage: 21.6V; Maximum Power Current: 1.11A. Multiple-module system can be put together in parallel or series. Wiring not included but easily sourced. Product Dimensions: 16.33" x 19.68" x .87" Designed for RVs, cabins, homes, boats, back-up and remote power use, and more Monocrystalline solar charger provides up to 20 watts of clean, free, renewable power