... Cell Efficiency:17% 3.Warranty:25 years 290w polycrystalline solar panel price(for home use) Advantages:-High brightness, energy saving, ... design.-Easy installation, free maintenance.-Quality in priority, clients the upmost.solar panel Specifications: Item No.ZDNY-290P72Max Power ... moisture and corrosion.3. The efficiency of monocrystalline solar cell is over 17%, polycrystallinepanel is over 16%. ...