Our inspectors found hot spot and crack to be quite common defects in PV modules via electroluminescence imaging, we will vet the causes behind this with the factory to mitigate the risk for qualified module production.
We keep on finding mistakes in the factory’s quality management in our module manufacturing inspection too. For instance, we found a mistake in the cell tabbing & stringing process made by the factory welding staff. The welding staff misused the cell connectors of other orders without checking the material brand as specified in the BOM; and a wrong label was applied on the packaging of an insulation sheet, potentially leading to mis-use of the material in production.
Hot Spot and Cracks