Max power should be tested in sunning weather 12:00-14:00am, no. Optimal power : 50W Working voltage : 20-22V Working current : 2.2-2.5A Short-circuit current : 2.7A Open-circuit voltage : 23V Maximum system voltage: 1000V Dimensions: 680560mm2.5mm Air resistance: 50psf (2400 pascals) Snow resistance: 113psf (5400 pascals) Hail impact: 25mm (1 inch) at 23 m/s (52mph) Net weight: 0.95kg/33.5oz.The item "Flexible 18V 50W Mono Solar Panel For Motorhomes Boats Cars 12V Battery Charger" is in sale since Friday, June 02, 2017. This item is in the category "Home & Garden\Home Improvement\Electrical & Solar\Alternative & Solar Energy\Solar Panels". The seller is "ranyue1885" and is located in China. This item can be shipped worldwide.