LonGi 640W Solar Panel (Bifacial, Hi-MO 9, LR7-72HYD 625~660M)LonGi 640W Solar Panel Overview The LonGi 640W Solar Panel (Hi MO 9, LR7 72HYD 625~660M) is designed for large scale utility applications, offering an outstanding balance of efficiency and performance. Equipped with TaiRay wafer and BC cell technology, this solar panel delivers more than 6. 5% power generation gain, ensuring high energy output throughout its lifecycle. With a bifaciality rate of up to 70% 90%, this model maximizes power output by