PROBLEM TO BE SOLVED: To provide a system and method for solar panel fault diagnosis, using a radio-controlled helicopter to detect a defective part in a solar panel, and a radio-controlled helicopter used in the system and method.SOLUTION: An infrared camera 30 is mounted on a radio-controlled helicopter 20, the radio-controlled helicopter 20 and the infrared camera 30 are remote controlled to capture an infrared image P of a solar panel 50, the captured infrared image P is output to a video monitor 48, and thereby a defect part P1 of the solar panel 50 is detected and specified to perform fault diagnosis.
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