METHOD FOR VISUAL INSPECTION OF PHOTOVOLTAIC MODULE

A method for visual inspection of a photovoltaic module, including: turning on a first light source located above the photovoltaic module, and recording, by an image collector, first coordinates and second coordinates of edge intersections at ends of the film strips; turning on a second light source located below the photovoltaic module, and recording, by the image collector, third coordinates and fourth coordinates of overlapping points among edges of the solar cells, the ends of the film strips, and the cell gaps or the string gaps; and analyzing, by the image collector, differences between the first coordinates and the third coordinates and between the second coordinates and the fourth coordinates along width directions of the cell gaps or the string gaps, wherein the differences are overlap spacings between the film strips and the solar cells.