Preventing Frozen Fans and Addressing Fan_H Alarm - Cold Weather Operation Function

In extremely cold climates, cooling fans may freeze due to prolonged inactivity during long winter nights. When this occurs, the inverter may trigger a Fan_H Alarm, indicating the fan is unable to rotate. A firmware-based solution is available to periodically operate the fans, preventing freezing and improving inverter reliability.

Steps to Resolve Fan_H Alarm

1. Confirm the Alarm Type

   • Verify the occurrence of the Fan_H Alarm using SolisCloud or the inverter’s HMI.

2. Supported Inverter Models

   • Solis-(125-255)K-EHV-5G-US-PLUS

3. Install HMI Firmware Update

   • Required Version: HMI Firmware (Version 8A).
   • Source: Firmware files can be downloaded from SolisCloud.

4. Configure Intermittent Fan Rotation

   • Default Recommended Settings:
     • Interval time: 3 minutes.
     • Fan rotation time: 30 seconds.
   • Winter Date Range: Set dates (e.g., December 1 – March 1) to enable this feature only during cold months.
   • Set Temperature: Temperature to start fans may be se in C (Celsius)

5. Verify the Fix

   • Monitor fan operations during the configured interval to ensure proper functionality.
   • Observe if the alarm is cleared after the update.

Preventive Measures

• Proactive Configuration: Implement the intermittent fan rotation feature before the onset of winter.
• Regional Adjustments: Tailor the rotation interval and dates based on the climate of the site.

Client Communication

• Explain that frozen fans are a known issue in extreme cold, and the firmware provides a preventive solution.
• Guide the client through configuring fan rotation settings or provide remote support.
• Emphasize that these settings can significantly reduce the risk of fan freezing and related alarms.

**See attached video as reference