Why does the inverter report "PV insulation resistance is too low (Error 203)"
Analysis:
All of Growatt's on-grid inverters will take the insulation resistance test between panels to ground before starting up. If the positive and negative poles of the string are short-circuited to the ground, it will damage the inverter. Therefore, when the "PV insulation resistance is too low" occurs in the inverter, it needs to be dealt with in time. You can use a multimeter to measure whether the resistance of the positive and negative pairs of the string is lower than 50KΩ. If it is lower, which means that there is leakage in the modified line. Or use a multimeter to measure the voltage of the positive and negative poles of the string to the ground. If it is purely at a certain voltage value, it also means that the line is purely leaking.
Solution:
Check out the string with leakage current and make rectification. If there is no problem with the wiring, consider replacing the inverter.
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