GOOWAY 200 watt solar panels adopt the 9BB solar panel cell design and are made of excellent Grade A cells. The conversion rate is as high as 25 % and can provide about 1000 Wh of electricity per day (depending on sun availability). Compared with 5BB and Grade B solar panel cells, it has better quality and efficiency. Durable and Long Lasting. GOOWAY solar panels are built to last with IP67 rated junction boxes that are waterproof and able to withstand wind loads of up to 2400Pa and snow loads of up to 5400Pa. In addition, we have upgraded the package of the panels to reduce the damage caused by transportation. Fast and Easy Installation. 4 pre-drilled holes on the back of the solar panels 200w allow for quick mounting, which is ideal for off-grid applications and are directly compatible with GOOWAY ground mounts, Z Brackets, Corner Brackets, Pole Mounts, and Tilt Mounts.