40w Poly-Crystalline Solar Panel with 1 metre cable Maximum Power (Pmax): 40W Maximum Power Voltage (VMP): 17.60V Maximum Power Current (IMP): 2.27A Open Circuit Voltage (VOC): 21.50V Short Circuit Current (ISC): 2.50A Weight: 3KG Size: 540*510*25mm Power Tolerance: +/-3% Maximum System Voltage: DC600V Lightweight design with rigid anodised aluminium alloy frame and toughened glass Designed in the UK. CE, TUV, ISO 9001 quality assurance. Why Go Solar Beat energy inflation, energy security, remote location power sources (save a fortune on armoured cabling), mobile power sources, fast payback periods over conventional fuel sources such as diesel generation and hook-ups, keep batteries fully charged at all time as deep discharge shortens life, environmentally friendly power which reduces carbon emissions to slow global warming and climate change. Applications Sheds, Stables, Boats, Caravans, Motorhomes, electric fencing, road/ path/ driveway illuminated signage, campsites, yurts, multi-panel off grid power source for small buildings, remote telecoms, mobile food outlets, and many more... Independent Off-Grid Solar Power Source One or more solar panels can be connected a battery bank and power inverter using a solar charge controller. You can therefore have a 240v power supply anywhere in the world without grid supply. Please see our solar power kits. Solar Panels do still generate power during cloudy and rainy weather A rough to guide solar panel power output relative to weather conditions:- 100% power output - clear sky midday sun with the panel fully tilted toward the sun's position in the sky. 75-85% output - clear sky midday sun but with the panel laid flat 50% output - thin cloud, or intermittent small clouds 10-20% output - midday overcast sky or rainy conditions If the solar panel is in shade for a prolonged period, our solar panels either have one or two built-in bypass diodes which will enable the panel to continue generating.