How are grade (A, B, C) cells classified?
There’s a lot of confusion between different grade solar cells. Any deviation is often graded as B, however a correct classification is complicated because there are dozens of different solar cell defects that can occur. This post is a first attempt to design a classification (A, B, C) of solar cells , and is a summary of a more in-depth report. 1. Grade A solar cells Grade A cells are simply without any visible defects, and the electrical data are in spec. The specifications of the cells can be measured with cell testing equipment . The perfect grade A cell may still have a slight bend of tiny color deviation is permitted. Below a grade A solar cell. Due to the light the color seems to deviate, but in fact, this is a flawless solar cell: Grade A – solar cell 2. Grade B solar cells Grade B cells have visible but tiny defects, and the electrical data are in spec. The following visible defects are common: Slight bend of 2.0mm – 2.5mm Color deviati...