Analysis:
For Growatt inverters, the DC voltage typically reaches up to 550V for single-phase models and up to 1100V for three-phase models. If the string voltage surpasses these limits, the inverter will trigger a warning indicating that the PV input voltage is too high.
Solution:
Inspect each string to confirm that the combined open-circuit voltage of the PV modules stays below the inverter’s maximum allowed voltage. Additionally, take into account how ambient temperature variations may impact the voltage of the components.
Analysis:
Before starting up, all Growatt on-grid inverters perform an insulation resistance test between the panels and the ground. If either the positive or negative poles of the string are shorted to the ground, it can cause damage to the inverter. Therefore, if the inverter displays a “PV insulation resistance is too low” alert, it should be addressed promptly. A multimeter can be used to check whether the resistance between the positive and negative poles of the string is less than 50KΩ. If the reading is lower, it indicates a leakage in the circuit. Additionally, measuring the voltage between the string’s poles and the ground can help identify if there is a leakage, especially if the voltage reads a steady value.
Solution:
Identify the string with leakage current and correct the issue. If the wiring appears fine but the problem persists, replacing the inverter may be necessary.
Analysis:
Growatt on-grid inverters are engineered to comply with local grid safety standards, but fluctuations in the grid can cause changes in voltage. If the voltage exceeds the inverter’s operational range, the inverter will disconnect from the grid and display a message such as “AC voltage out of range.” For instance, in China, under CQC certification, the inverter operates within an AC voltage range of 195V-253V. If the grid voltage surpasses this limit, the inverter disconnects due to the high voltage.
Solution:
The voltage range can be expanded through the inverter’s settings menu. Alternatively, you can use the Shinebus software for inverter diagnostics to modify the voltage protection parameters. Tools such as the ShinePhone or ShineTools app, or the ShineServer platform (web version), also allow users to access the parameter settings interface to adjust the device’s voltage range.
Analysis:
This error indicates that the bus capacitor voltage within the inverter is irregular, with significant deviations between the positive and negative values. When this issue arises, it’s important to verify whether the string voltage is excessively high or if the string is grounded.
Solution:
Start by inspecting the wiring for any issues. If a wiring problem is identified, correct it and restart the device. If the wiring is in good condition but the error persists, please reach out to our after-sales support team for further assistance.
Analysis:
When the inverter reports an excessively high temperature, it’s important to inspect whether the installation site has proper ventilation and confirm if the fan is functioning correctly. If external factors are not the cause, contact our after-sales service team to review the inverter’s log and determine the underlying cause of the high temperature.
Solution:
If external factors are identified, take the necessary corrective actions. For internal issues, please follow the instructions provided by our after-sales engineers.
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