After a cell is cracked, the effect on the solar panel’s power output becomes worse and worse over the years.
Temperature changes associated with day and night cause thermal expansions and contractions that help pull apart the materials around the crack.
The video is made by running current backwards through the solar panel, so that the solar cells light up, like an LED.
The color of light that the solar cells emit is infrared (invisible to the eye), so the video is made using a special camera.
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