Check the DC input parameters displayed by the inverter, to see whether the DC input voltage is too high (at any time, the string open circuit voltage cannot exceed the maximum input voltage of the inverter), whether there are too many components in series, and if so, then shut down the inverter,. [pdf]
[FAQS about The inverter reports that the DC component is too large]
Wait until the PV string current decreases to below 0.01 A, set DC SWITCH to OFF, and check whether the positive and negative terminals of the PV string are reversely connected and whether PV+ is short-circuited to PV–. If yes, rectify the PV string fault. [pdf]
[FAQS about Photovoltaic inverter reports pv reverse connection]
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