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As the running time of PV plants increase, the DC line slowly ages, and the waterproof performance of the DC terminal (MC4 terminal) deteriorates. As a result, the insulation impedance of the DC line is too low, or the positive and negative terminals are short circuited to the ground. Either way, major failures may occur, affecting the generation of electricity. It may be difficult for inexperienced power plant O&M personnel to exclude grounding PV string or to find the point of grounding PV string. This Solis seminar will share a method of locating ground fault points to improve troubleshooting speed and cut down on manpower.