SolarEdge Error Code 12 – Meaning, Causes & Solution -... | solardiagnostics.org

Technical Background:

The ARC_DETECTED 12 indicates that the inverter's ground fault detection system has identified an arc fault condition. This is typically triggered by an insulation resistance measurement (RISO) that falls below acceptable thresholds, indicating a potential short circuit or unintended current paths. The inverter continuously monitors for anomalies in current flow and voltage levels, and when it detects irregularities that suggest an arc, it shuts down to prevent fire hazards and equipment damage.

Symptoms:

Homeowners may notice the inverter displaying the ARC_DETECTED 12 on the screen, often accompanied by a red LED indicator. The monitoring app may show a sudden drop in production or alert users to a fault condition. The inverter may also enter a shutdown mode to protect the system from potential hazards.

Possible Causes:

Insulation failure in the array or wiring, leading to unintended current paths.
Loose or corroded connections in the junction box or at the inverter terminals.
Faulty or damaged components within the inverter, such as the ground fault detection circuitry.
External environmental factors, such as moisture ingress or physical damage to wiring.
Inadequate grounding of the solar array, resulting in an improper RISO measurement.
Aging or degraded components that may not withstand operational conditions.

Solution:

1

Disconnect the inverter from the utility grid using the AC disconnect switch and ensure all safety protocols are followed.
2

Inspect the array wiring and connectors for any signs of damage, corrosion, or loose connections. Use a multimeter to check for continuity.
3

Perform an insulation resistance test (RISO) on the array and wiring; a reading below 1 MΩ indicates a potential fault.
4

Check the ground connections to ensure they are secure and properly bonded to the system.
5

If the problem persists, inspect the inverter for any internal faults or damage. Consider using diagnostic tools to evaluate the inverter's internal components.
6

Reconnect the inverter and monitor its performance through the monitoring app for any reoccurrence of the fault code.

Safety Warning:

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

Prevention:

To avoid this issue in the future, regularly inspect all wiring and connections for signs of wear or damage, especially after severe weather events. Ensure that all components are rated for the environmental conditions of the system site. Implement routine maintenance checks, including insulation resistance testing and verification of grounding integrity.

Frequently Asked Questions

•What does ARC_DETECTED Code 12 indicate?

ARC_DETECTED Code 12 indicates that the inverter has detected an arc fault, which can pose safety risks. It is crucial to address this issue promptly to ensure system safety.

•How can I troubleshoot this error?

To troubleshoot this error, check the wiring connections and ensure there are no damaged cables. If the issue persists, consult a professional technician for further diagnosis.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What does ARC_DETECTED Code 12 indicate?

•How can I troubleshoot this error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: