SolarEdge Error Code 166-168 – Meaning, Causes &... | solardiagnostics.org

Technical Background:

The SolarEdge inverter utilizes advanced algorithms to monitor the performance of the solar array and detect faults. Error codes 166-168 are primarily related to ground faults and communication issues. A ground fault occurs when there is an unintended connection between the live conductor and the ground, which can lead to safety hazards. The inverter continuously measures insulation resistance (RISO) to identify any drops below acceptable thresholds, triggering these fault codes. Additionally, communication failures may arise from wiring issues, resulting in the inverter being unable to relay performance data to the monitoring system.

Symptoms:

Homeowners may observe LED indicators on the SolarEdge inverter displaying error codes 166-168, which typically flash in a specific pattern. Additionally, the monitoring app may alert users to production drops or indicate that the inverter is offline. In some cases, the inverter may not respond to commands from the monitoring system, leading to a complete halt in solar energy production. Users may also notice unusual sounds or smells emanating from the inverter, indicating potential internal issues.

Possible Causes:

Ground fault detection triggered due to insulation failure in the array or wiring.
Reverse polarity in the DC input, causing the inverter to shut down to prevent damage.
Overvoltage condition detected from the array, possibly due to excessive sunlight or faulty components.
Communication failure between the inverter and the monitoring system, indicating a potential wiring issue.
Faulty components within the inverter, such as capacitors or the main control board, leading to abnormal operation.

Solution:

1

Disconnect the inverter from the utility grid using the AC disconnect switch before performing any checks.
2

Use a multimeter to check the insulation resistance of the DC wiring; it should be above 1 MΩ to avoid ground fault issues.
3

Inspect the array for any visible damage, ensuring all connections are secure and polarity is correct.
4

Check the voltage output of each string with the multimeter; ensure it aligns with expected values for your specific array configuration.
5

If communication errors persist, inspect the communication wiring and connections between the inverter and the monitoring system.
6

After addressing any issues, reconnect the inverter and monitor for fault codes; reset if necessary.

Safety Warning:

Always engage a licensed electrician or certified solar installer when troubleshooting or repairing solar inverter issues to ensure compliance with safety protocols and local electrical codes.

Prevention:

To avoid future occurrences of error codes 166-168, it is essential to conduct regular maintenance on the solar array and inverter system. This includes periodic inspections of wiring insulation, ensuring that all connections are tight and free from corrosion, and verifying that the inverter firmware is up to date. Additionally, consider installing surge protection devices to safeguard against overvoltage conditions.

Frequently Asked Questions

•What do SolarEdge error codes 166-168 indicate?

Error codes 166-168 typically indicate hardware communication issues within the inverter. These errors can affect system performance and require immediate attention.

•How can I resolve SolarEdge error codes?

To resolve these errors, check the connections and ensure all hardware components are functioning properly. Restarting the inverter may also help clear the errors.

SolarEdge Error Code 166-168 – Meaning, Causes & Solution

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What do SolarEdge error codes 166-168 indicate?

•How can I resolve SolarEdge error codes?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: