Deye Error Code F35 – No Grid Connection During Grid-Tie... | solardiagnostics.org

Technical Background:

The F35 fault is triggered when the inverter detects that the grid connection is compromised during grid-tie operation. This can occur due to inadequate grid voltage or frequency, which falls outside the inverter’s operational limits. The inverter continuously monitors grid parameters to ensure safe operation; if these parameters deviate significantly, the inverter will enter a fault state to protect both itself and the connected system. Additionally, ground fault detection mechanisms may activate if insulation resistance is below acceptable thresholds, further contributing to the fault condition.

Symptoms:

Upon encountering the F35 error code, users may observe the inverter's LED indicator displaying a fault pattern, typically a solid red light or a blinking sequence. The monitoring app may also alert the user with a notification indicating a loss of grid connection, and there may be a noticeable drop in energy production, as the inverter is unable to synchronize with the utility grid.

Possible Causes:

Inadequate grid voltage or frequency outside acceptable limits.
Faulty grid connection or wiring issues from the inverter to the utility grid.
Inverter internal fault, such as a malfunctioning relay or control board.
Ground fault detection triggering due to insulation resistance issues.
Incorrect settings or parameters configured in the inverter.
External conditions affecting grid connectivity, such as severe weather or utility maintenance.

Solution:

1

Use a multimeter to measure the voltage at the inverter's AC output terminals to ensure it falls within the acceptable range (typically 120V to 240V).
2

Inspect all wiring connections from the inverter to the utility grid, including junction boxes and breakers, for any signs of damage or loose connections.
3

Check the inverter's configuration settings via the monitoring app or interface to ensure they are set for the correct grid parameters.
4

Conduct an insulation resistance test on the array and wiring to identify any potential ground faults.
5

Reset the inverter by turning off the AC disconnect switch, waiting for 10 seconds, and then turning it back on.
6

If the fault persists, consult the inverter's manual for specific troubleshooting steps related to the F35 error code, or contact a certified technician for further diagnosis.
7

Document any changes or observations made during troubleshooting for future reference.

Safety Warning:

Always ensure that troubleshooting and repairs are performed by a licensed electrician or certified solar installer to prevent electrical hazards and ensure compliance with local codes.

Prevention:

To avoid encountering the F35 error in the future, regularly inspect and maintain all electrical connections, ensuring they are tight and free from corrosion. Schedule routine performance checks on the inverter and the entire solar array system, and stay informed about local utility grid conditions that may affect performance. Additionally, ensure that the inverter firmware is up to date, as manufacturers often release updates that improve functionality and fault detection capabilities.

Frequently Asked Questions

•What causes a Deye inverter to lose grid connection?

A Deye inverter may lose grid connection due to issues with the utility grid, incorrect settings, or hardware malfunctions. Checking the grid voltage and inverter configuration can help identify the problem.

•How can I troubleshoot my Deye inverter?

To troubleshoot your Deye inverter, start by checking the grid connection and settings. Ensure that the inverter is properly configured for grid-tie operation and inspect for any visible damage.

Deye Error Code F35 – No Grid Connection During Grid-Tie Mode Troubleshooting & Technical Fix Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What causes a Deye inverter to lose grid connection?

•How can I troubleshoot my Deye inverter?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: