What are the differences between Class A and Class B photovoltaic panels
1. Differences between Class A and Class B photovoltaic panels:
Color: The color within a group of Class A panels is consistent, while Class B panels are allowed to have slight color differences within the same group.
Perforations: Not allowed for both Class A and Class B.
Broken grid lines: Not allowed for both Class A and Class B.
Broken fine grid lines: For Class A, if the length is less than 1 mm, there should not be 3 consecutive ones, and there should be less than 2 in a group. For Class B, if the length is less than 2 mm, there should not be 3 consecutive ones, and there should be less than 4 in a group.
Grid line oxidation: None for both.
Aluminum beads: The height should be less than 0.1 mm.
Reverse current: Less than 0.5 A (for 125) and less than 0.8 A (for 156).
Power: Consistent with the agreed power, and the negative tolerance should be less than 0.1 W.
Scratches on the front surface:
Damage on the aluminum back:
These are the bases for distinguishing between Class A and Class B from the appearance. Generally, we can’t directly tell the internal differences, but in terms of test data, the power consistency of Class A is good, while Class B has certain fluctuations.
Regular manufacturers usually use Class A and Class B to produce solar cells. Class A is mainly for export, while Class B is for domestic sales or foreign markets with lower price requirements. Solar cells made also have Class A and Class B. Class A has higher requirements. For example, the color and luster within the same component are required to be consistent for Class A. The gaps between solar cells are strictly measured with a ruler for Class A, and there will be no skew or misalignment. The thickness of the back film is required to be greater than 0.3 mm. In the selection of other materials, Class A and Class B are basically the same, so Class B is also economical and practical.
2. How to distinguish between Panel A and Panel B of photovoltaic panels?
Generally, the conversion efficiency, fill factor and appearance of Class A are better than those of Class B.
Solar cells are generally divided into monocrystalline silicon, polycrystalline silicon and amorphous silicon. Monocrystalline silicon solar cells are currently the fastest-developed type of solar cells. Their structure and production process have been finalized, and the products have been widely used in space and on the ground. Such solar cells use high-purity monocrystalline silicon rods as raw materials.
To reduce production costs, solar cells for ground applications now use solar-grade monocrystalline silicon rods, and the material performance indicators have been relaxed somewhat. Some can also use the head and tail materials and defective monocrystalline silicon materials processed by semiconductor devices, and after repeated drawing, make them into monocrystalline silicon rods dedicated to solar cells.