Grade B doesn't mean low efficiency. The major difference between Grade A and Grade B is visual defects and potential efficiency degradation over time. For DIY modules and non-commercial
modules, it is a good option because of cost
156mm X 156 mm, high efficiency, grade B solar cell
| Effeciency: | 14%~17% |
| Max. Power: | 4.1 |
| Number of Cells: | 1 |
| Size: | 156x156 mm |
| Material: | Polycrystalline Silicon |
| Model Number: | i-156P |
| Brand Name: | ipower! |
| Place of Origin: | Jiangsu China (Mainland) |