Growatt Error Code 424 INV – Meaning, Causes & Solution... | solardiagnostics.org

Technical Background:

The Growatt 424 INV triggers fault 424 when it detects an anomaly in the electrical parameters that exceed predefined thresholds. This can occur due to ground fault detection mechanisms that identify an imbalance in current flow, typically indicating a potential short circuit or leakage current. The inverter is designed to ensure safety and compliance with the National Electrical Code (NEC) by continuously monitoring insulation resistance (RISO) and grid frequency limits, which if exceeded, can lead to operational faults.

Symptoms:

Users may observe the inverter's LED indicator flashing a specific pattern associated with fault 424. Additionally, the monitoring app may show alerts regarding production drops or operational interruptions. The system may also stop producing energy or experience erratic output.

Possible Causes:

Ground fault in the array or wiring, causing an imbalance in current flow.
Insulation resistance failure detected during RISO measurement.
Exceeding grid frequency limits, indicating potential issues with the Utility Grid.
Incorrectly configured settings or firmware issues within the inverter.
Overheating due to environmental factors or inadequate ventilation.
Faulty components within the inverter, such as capacitors or transistors.

Solution:

1

Use a multimeter to check for ground faults by measuring continuity between the array and the ground. Disconnect the array using an MC4 disconnect tool before testing.
2

Perform insulation resistance testing (RISO) on the DC side of the inverter to ensure the insulation is intact. A reading below 1 MΩ indicates a fault.
3

Verify the inverter's firmware version and settings through the monitoring app, ensuring they match the manufacturer's specifications.
4

Inspect the inverter's ventilation and ambient conditions; ensure that it is not overheating and that air pathways are clear.
5

If a fault is detected in the inverter’s internal components, consult the manufacturer for service or replacement options.
6

Reconnect the system and monitor for fault codes after addressing any identified issues.

Safety Warning:

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

Prevention:

Regular maintenance checks, including insulation resistance testing and visual inspections of wiring and connections, can help prevent future occurrences of fault 424. Keeping the inverter’s environment clear of obstructions and ensuring proper ventilation will also minimize risks.

Frequently Asked Questions

•What does the Growatt 424 INV current fault indicate?

The current fault indicates an issue with the inverter's output, possibly due to overload or short circuit. It's essential to check the connected load and wiring.

•How can I reset the Growatt 424 INV after a fault?

To reset the Growatt 424 INV, turn off the inverter and disconnect it from the power source. Wait for a few minutes before reconnecting and powering it back on.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What does the Growatt 424 INV current fault indicate?

•How can I reset the Growatt 424 INV after a fault?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: