Very high performance polycrystalline solar panels Watertight sealed multifunctional junction box for a high level of safety High-performance bypass diodes for better protection against hot spot effects in the event of partial blackout. A sturdy anodized frame allows the modules to be easily mounted on a roof with a variety of standard mounting systems. Please feel free to contact us with any questions reliability This 20 watt panel is made from monocrystalline solar cells that give you one of the most efficient per room. Corrosion resistant aluminum frame for extended outdoor use,so panels will last for decades and withstand high winds (2400Pa) and snow loads (5400Pa). Waterproof Corrosion resistant aluminum frame for extended outdoor use so signs will last for decades. Compatible with on-grid and off-grid inverters. Drill holes in the back of the panel allow for quick assembly and fixing. Easy to install Off-grid roof/floor mounting. Residential / Rural. Pre-drilled holes on the back of the plate for quick assembly and fixing. RVs,trailers,RVs,caravans,boats,etc. 12 volt battery charge.