Goodwe Error Code 108 – Meaning, Causes & Solution -... | solardiagnostics.org

Technical Background:

Error 108 indicates that the inverter has detected fluctuations in the grid voltage that exceed its operational limits. This can occur due to a variety of reasons, including rapid voltage spikes or drops that the inverter cannot compensate for. The inverter continuously monitors grid parameters, including voltage and frequency, to ensure safe operation. If these parameters fall outside of predefined thresholds, the inverter will trigger protective measures to prevent damage to both itself and the connected solar array.

Symptoms:

Users may observe the inverter displaying error 108 on the screen, accompanied by a flashing LED indicator. Monitoring apps may show production drops or interruptions in energy output. There may also be alerts indicating grid voltage fluctuations, which can lead to a temporary shutdown of the inverter.

Possible Causes:

Fluctuating grid voltage due to utility grid issues.
Loose or corroded connections at the junction box or inverter terminals.
Inadequate wire sizing leading to voltage drop under load.
Faulty or aging inverter components affecting voltage regulation.
External electrical interference from nearby heavy machinery or equipment.
Ground faults within the array or wiring leading to instability.

Solution:

1

Verify grid voltage using a multimeter at the inverter’s AC output terminals to ensure it is within the acceptable range (typically 240V +/- 10%).
2

Inspect all electrical connections for tightness and corrosion, especially at the junction box and inverter terminals. Use an MC4 disconnect tool if necessary.
3

Measure insulation resistance of the array and wiring using an insulation resistance tester to identify potential ground faults.
4

Check the wire gauge and length to ensure they are appropriate for the system size and configuration, replacing any undersized wiring.
5

Inspect the inverter for any signs of damage or overheating, and check for firmware updates that might address known issues.
6

If external interference is suspected, relocate the inverter or install shielding as necessary to reduce noise.
7

Document all findings and repairs for future reference and system tracking.

Safety Warning:

Always consult a licensed electrician or a certified solar installer when performing maintenance or troubleshooting on solar systems to ensure safety and compliance with local electrical codes.

Prevention:

To prevent future occurrences of error 108, ensure regular maintenance of the system, including periodic checks of all electrical connections, regular insulation resistance testing, and monitoring grid voltage stability. Consider installing a power quality monitor to detect fluctuations in real-time.

Frequently Asked Questions

•What causes grid voltage fluctuations in solar inverters?

Grid voltage fluctuations can be caused by issues in the utility grid, such as overloads or faults. Additionally, environmental factors like storms can affect voltage stability.

•How can I prevent future grid voltage issues?

To prevent future grid voltage issues, ensure your inverter is properly configured and monitor grid conditions regularly. Consider installing voltage regulation devices if fluctuations persist.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What causes grid voltage fluctuations in solar inverters?

•How can I prevent future grid voltage issues?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: