Product has never been used The product is in packaging that was damaged during transport. It has not been opened. The product has been repackaged in our warehouse and is fully functional. Available warranty Energy Surge Up to 33%:12BB double sided solar panel of 23% conversion efficiency, with up to 91.5% transimittance, generates 858Wh per day Solid Components:The back panel, made of composite material, is windproof and snow-resistant. The metal aluminum frame is rust-proof and anti-corrosion. And the pre-installed hole design makes it easy to install Transparent Back Panel:Almost 91.5% transimittance makes the back panel well convert sun scattered light even when the front side is shaded, which is widely chosen to be used in sunroom, entrance canopy, farm greenhouse and motorhome Easy Installation:Size-52.6 x 26.4 x 1.4inches(1335*670*35mm), weight 20.48 Lbs. Diodes are pre-installed in junction box, with a pair of pre-attached 2.95ft Cable. Pre-drilled holes on the back of the