The slight overlap of each cell strip hides a single busbar which interconnects the cell strips. This unique design covers more of the panel surface area Campeón it doesn’t require front side busbar connections which partially shade the cell, thus increaseing the panel efficiency much like IBC cells explained below. http://wayloniunzc.blogsidea.com/2389185/los-principios-básicos-de-placa-solar-nevera-y-tele