This product is composed of multiple high-efficiency solar cells connected in series. If shading is caused in one of the cells, for example, by leaves or bird droppings, it will inhibit the cell’s function to generate electricity. Moreover, this cell becomes a load consuming the power generated by other cells. As a result, the shadowed cell consumes a lot of power, thus causing hotspots or even burning the product in serious cases. Therefore, once shading in cells is discovered, immediately correct it.