Goodwe DC Overvoltage String Warning – Troubleshooting &... | solardiagnostics.org

Technical Background:

The Goodwe inverter triggers a DC overvoltage string warning when the voltage from the solar array exceeds its maximum input threshold. This can occur due to various factors, including high solar irradiance and temperature, which increase the voltage output of the modules. The inverter continuously monitors the string voltage and employs internal safety protocols to prevent damage or unsafe operating conditions. If the voltage surpasses the set limits, the inverter will disconnect to protect both itself and the connected electrical system.

Symptoms:

Homeowners may observe an alert on the monitoring app indicating a DC overvoltage string warning. Visually, the inverter may display a red LED blinking pattern, signaling a fault condition. Additionally, there may be a noticeable drop in energy production, with outputs significantly lower than expected based on solar irradiance.

Possible Causes:

Overvoltage due to excessive irradiation or temperature affecting the array voltage.
Incorrect string configuration leading to mismatched voltage levels.
Faulty or damaged components within the string, such as bypass diodes or modules.
Poor connections at the junction box or between modules causing resistance and voltage spikes.
Inadequate grounding or bonding issues leading to unstable voltage readings.

Solution:

1

Disconnect the inverter from the utility grid using the AC disconnect switch, ensuring safety before proceeding.
2

Use a multimeter to measure the voltage at the string level to confirm if it exceeds the inverter’s maximum input voltage rating.
3

Inspect all connections within the junction box and along the string for signs of corrosion or damage, tightening any loose connections.
4

Evaluate the string configuration against the inverter specifications to ensure compatibility, adjusting as necessary.
5

Check for shading or debris on the solar array that could cause voltage fluctuations, cleaning the modules if needed.
6

Reconnect the inverter and monitor the system's performance through the monitoring app to verify that the fault has cleared.

Safety Warning:

Always consult a licensed electrician or certified solar installer when troubleshooting electrical issues to ensure compliance with safety standards and regulations.

Prevention:

To avoid future occurrences of DC overvoltage string warnings, ensure regular maintenance checks of the solar array and inverter system, focusing on cleaning modules, inspecting connections, and verifying string configurations. Implementing a monitoring system that alerts to voltage anomalies can also help in early detection.

Frequently Asked Questions

•What causes a DC overvoltage string warning?

A DC overvoltage string warning can be caused by excessive voltage from the solar panels, faulty wiring, or incorrect inverter settings. It's essential to check the system configuration and panel output.

•How can I prevent overvoltage warnings?

To prevent overvoltage warnings, ensure proper installation and configuration of the solar system. Regular maintenance and monitoring can help identify potential issues before they escalate.

Goodwe DC Overvoltage String Warning – Troubleshooting & Technical Fix Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What causes a DC overvoltage string warning?

•How can I prevent overvoltage warnings?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: