Sungrow Error Code 002 – Meaning, Causes & Solution -... | solardiagnostics.org

Technical Background:

Error 002 signifies that the inverter has detected grid overvoltage conditions that exceed its operational limits. The inverter is designed to protect itself and the solar array from potential damage by disconnecting from the grid when voltage levels rise above predefined thresholds. This protective mechanism relies on accurate voltage sensing circuits within the inverter, which continuously monitor the AC voltage supplied by the utility grid. If the measured voltage exceeds the inverter's set limits, it triggers the fault code to prevent damage, ensuring safety and compliance with the National Electrical Code (NEC) standards.

Symptoms:

When the Sungrow inverter triggers Error 002, users may observe specific symptoms such as a blinking red LED on the inverter, a corresponding alert on the monitoring app indicating a grid overvoltage, and a noticeable drop in energy production. The inverter may also display an error message on the screen, indicating that it has entered a protective shutdown mode due to excessive voltage from the utility grid.

Possible Causes:

Overvoltage conditions from the Utility Grid exceeding the inverter's set limits.
Faulty voltage sensing circuits within the inverter.
Incorrectly configured grid parameters during system.
Issues with the array, such as shading or malfunctioning modules leading to voltage spikes.
External factors like lightning or nearby electrical disturbances causing transient overvoltage.
Poor connections or damaged wiring in the junction box affecting voltage readings.

Solution:

1

Use a multimeter to measure the AC voltage at the inverter output and compare it with the utility grid voltage specifications.
2

Inspect all connections in the junction box and ensure that they are secure and free of corrosion or damage.
3

Check the inverter's configuration settings to confirm that the grid parameters match those provided by the utility company.
4

Examine the solar array for any shading, damaged modules, or wiring issues that could cause voltage irregularities.
5

If the voltage readings are consistently high, consider contacting the utility provider to verify grid stability.
6

Reset the inverter by turning it off and back on to clear the fault code after addressing any underlying issues.
7

Monitor the system for any recurrence of the error post-repair to ensure the issue has been resolved.

Safety Warning:

Always ensure that any troubleshooting or repairs are performed by a licensed electrician or certified solar installer to ensure compliance with safety standards and local regulations.

Prevention:

To prevent future occurrences of Error 002, ensure that the inverter is installed with proper grid configuration settings according to local utility requirements. Regularly inspect the solar array for shading and module performance, and perform routine maintenance on all electrical connections to prevent corrosion. Additionally, consider installing surge protection devices to safeguard against transient overvoltage events caused by lightning or other electrical disturbances.

Frequently Asked Questions

•What does Grid Overvoltage mean in solar systems?

Grid Overvoltage indicates that the voltage supplied by the grid exceeds acceptable limits, potentially damaging equipment. It is crucial to address this issue to ensure system safety and performance.

•How can I prevent Grid Overvoltage errors?

Preventing Grid Overvoltage involves monitoring grid conditions and ensuring proper inverter settings. Regular maintenance and updates can also help mitigate this issue.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What does Grid Overvoltage mean in solar systems?

•How can I prevent Grid Overvoltage errors?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: