Bus voltage is too high or bus hardware overvoltage fault When the DC voltage input to the inverter exceeds the maximum DC input voltage of the inverter, the inverter reports inverter failure of an excessive bus voltage or inverter failure of bus hardware overvoltage. Solution:
② Due to the local grid connection conditions of the photovoltaic power station, multiple single-phase inverters are connected to the same live line, and the grid''s accommodation capacity is insufficient, causing the grid voltage to rise too high, and the inverter reports a grid overvoltage inverter failure.
Reason 3: The DC input voltage is too low. When the string output voltage is lower than the minimum input voltage of the inverter, there is no display on the inverter screen. To make sure, you can use a multimeter to measure the output voltage of the photovoltaic string to see whether the voltage reaches the minimum input voltage of the inverter.
The inverter’s AC output voltage or frequency deviates beyond acceptable limits, risking damage to connected devices and grid instability. 2. Possible Causes: Internal Control Circuit Failure: Aging, damaged, or poorly soldered components (e.g., capacitors, resistors, transistors) in the control circuit.
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