Solis-1P(3.6-10)K-4G inverters HMI firmware updating process

Most current firmware version: 4F for 3K, 3.6K, 4K, 5K, and 6K2 --- 43 for 6K, 7K, 7.6K, 8K, 9K, and 10K

For the following inverter models: Solis-1P2.5K-4G-US, Solis-1P3K-4G-US, Solis-1P3.6K-4G-US, Solis-1P4K-4G-US, Solis-1P5K-4G-US, Solis-1P6K-4G-US, Solis-1P7K-4G-US, Solis-1P7.6K-4G-US, Solis-1P8K-4G-US, Solis-1P9K-4G-US, Solis-1P10K-4G-US

Note: A Solis Update Stick is required in order to perform DSP and HMI firmware updates. Please reach out to your distributor or to Solis US Service to obtain an Update Stick. 

Solis inverters have two kinds of firmware: Digital Signal Processor (DSP) and Human-Machine-Interface (HMI)

1. Verify Firmware Version 

    a. Advanced Information > Password: 0-0-1-0 

    b. Version > hold down “Up” and “Down” buttons simultaneously for three seconds to display the software version 

    c. Record the model and software version displayed 

    d. If software version is 123456, the HMI version is 12.

2. Receiving/Storing the HMI Files 

    a. Solis will provide files that have been formatted/named for the inverter to accept them. 

        i. The file should be named HMI_WIFI.bin, be sure not to change the names unless the file icon is the Google Chrome icon. If that is the case, then name the file "HMI" 

3. Prepare USB stick with HMI upgrade file

    a. Prepare a USB drive with a non-metal shell. USB disk must be one of these formats: FAT32/FAT16/FAT12. 

    b. Copy the HMI_WIFI.bin file onto the USB drive’s root directory. Ensure that no other files or folders are in the USB directory. 

    c. Right click the drive and click "eject" before removing the flash drive

    d. Insert USB into bottom of Update Stick provided by Solis 

4. Prepare the Inverter and Install the Firmware 

    a. On the bottom of the inverter, unscrew the black plastic cap covering the COM port. 

    b. Connect the update stick to the COM port by plugging in with display LEDs facing you. The stick should have the Red and Green LED’s lit: 

    c. Advanced Settings > Password: 0-0-1-0 > Grid On/Off > Turn Grid to OFF 

    d. Stay in Advanced Settings > HMI Update > View HMI update interface. Current HMI version is displayed here as well 

   e. Press and hold the "Reset" button on the update stick until the lights go from red/green to red/yellow. Press and hold the button down one more time to make all three lights come on red/yellow/green.

    f. To start the update, press “Enter” in the HMI Update interface, wait 1.5 seconds, then short press the “Reset” button the back of the update stick. • If you are too fast or too slow to press the “Reset” button, the update will fail. You will have to start over from the DSP update interface once the update stick and inverter’s LED lights stop flashing. 

    g. After pressing the “Reset” button, the Green and Yellow LEDs on the update stick will flash fast. Then, it will change to a slower flash. The inverter’s Green and Yellow LED lights will also be flashing. This means that the HMI update is in progress. (The inverter screen will not display information regarding the status of the upgrade.) 

    g. When the update stick stops flashing and all three LEDs stay solidly lit, AND the inverter’s Green LED stops flashing, the update has completed successfully. The screen should come back on at this point.

    h. Check the Firmware version again (repeat Step 1) and confirm that the Software version has changed and reflects the new HMI version. 

    i. Unplug update stick and replace plastic cap over the COM port. 

    j. Return to Advanced Settings > Password: 0-0-1-0 > Grid On/Off > Turn Grid ON k. Confirm that the inverter resumes normal operation.


Victor is the author of this solution article.

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