CMS Inverter Clicking Noise and Green Light Flashing –... | solarfaults.org

Technical Background:

The clicking noise often indicates the inverter is attempting to reset or engage a protective mechanism. This can occur due to insulation resistance failures, triggering ground fault detection. When the inverter detects an imbalance or fault, it may interrupt power flow to prevent damage. Grid frequency limits are also critical; if the grid frequency deviates from the nominal range, the inverter will cease operation to protect both itself and the connected array.

Symptoms:

The CMS inverter is emitting a clicking noise accompanied by a flashing green light. The LED pattern may vary, but typically the green light indicates operational status. If it is flashing, this may signify a fault or abnormal condition. Users may also notice a drop in energy production, which can be monitored via the inverter's app or display interface.

Possible Causes:

Insulation resistance failure causing ground fault detection.
Over-voltage conditions due to array mismatch or shading.
Internal inverter component failure, such as a relay or capacitor.
Grid frequency fluctuations outside of acceptable limits.
Faulty communication between the inverter and monitoring system.
Loose or corroded connections within the junction box or at the inverter terminals.

Solution:

1

Use a multimeter to perform insulation resistance testing (RISO) between the DC positive, negative, and ground terminals to identify any ground faults.
2

Verify string voltage at the inverter input using a multimeter to ensure it is within the inverter's operational limits.
3

Inspect the junction box and all connections for signs of corrosion or looseness, tightening or replacing as necessary.
4

Check the inverter's firmware version and update if needed, ensuring proper communication with the monitoring system.
5

Monitor grid frequency using a power quality analyzer to confirm it is within the acceptable range.
6

If issues persist, consult the inverter's technical manual for further diagnostic procedures.

Safety Warning:

Always consult a licensed electrician or certified solar installer when performing diagnostics or repairs on electrical systems.

Prevention:

To prevent recurrence of this issue, ensure regular maintenance checks are performed on the inverter and array. Schedule annual inspections to look for signs of wear, corrosion, or loose connections. Keep the array free from shading and debris to maintain optimal performance. Regularly update the inverter firmware to ensure compatibility with grid requirements and monitoring systems.

Frequently Asked Questions

•What does a clicking noise in an inverter indicate?

A clicking noise in an inverter may indicate a fault in the internal components or a protective mechanism activating due to an issue. It's essential to investigate further to prevent damage.

•Why is the green light flashing on my inverter?

A flashing green light typically signifies that the inverter is operating normally but may also indicate a temporary fault or status change. Check the user manual for specific meanings.

CMS Inverter Clicking Noise and Green Light Flashing – Troubleshooting & Technical Fix Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What does a clicking noise in an inverter indicate?

•Why is the green light flashing on my inverter?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: