Webasto Unite Wallbox change 1/3 Phase Operation and Current Limit from HA (now Ampure/Vestel)

xkey · February 11, 2025, 9:43pm

Problem: Webasto Unite only has one Modbus input option: Webasto_Unite_Charging_Current. This is valid for 1-phase and 3-phase operation. The 1/3-phase operation can only be changed from the Wallbox Web UI. This only allows two different power outputs for the Wallbox:

1-phase: Power ranging from 1.38 to 7.36 kW
3-phase: Power ranging from 4.14 to 22 kW

I want to charge as much solar power as possible into the car, so I need the whole power range from 1.38 up to 22 kW. I want to be able to change 1/3-phase operation from HA without having to visit the Wallbox Web UI.

*I have only tested this on the Webasto Unite Wallbox, not with Vestel/Ampure.

Solution: Reverse engineering how the changes in the Web UI take place, I was able to create shell commands to execute the changes from HA.

First, you need to create these shell commands in configuration.yaml:

shell_command:
  schnellladen_session: curl --silent --cookie "PHPSESSID=295a3717ec16ac5b8bebf3e21ca7f311" --data "username=USERNAME&pass=PASSWORD&button_login=LOG+IN" http://192.168.2.102/
  schnellladen_ein: curl --silent --cookie "PHPSESSID=295a3717ec16ac5b8bebf3e21ca7f311" --data "currentLimiterPhaseSelection=1&currentLimiterValue=16&button_current_limiter_settings=Daten+absenden" http://192.168.2.102/index_main.php >/dev/null
  schnellladen_aus: curl --silent --cookie "PHPSESSID=295a3717ec16ac5b8bebf3e21ca7f311" --data "currentLimiterPhaseSelection=0&currentLimiterValue=16&button_current_limiter_settings=Daten+absenden" http://192.168.2.102/index_main.php >/dev/null

Replace

USERNAME with your username
PASSWORD with your password
192.168.2.102 with the local IP address of your Wallbox.

Both USERNAME and PASSWORD need to be URL encoded if they contain special characters, which you can do here: https://www.urlencoder.io/

The PHPSESSID can be any random string as far as I know, but it has to be the same for all shell commands. You can leave it as it is.

Now you can create your automations from this. For starters, I used a simple switch input_boolean.schnellladen to change from 1/3-phase operation.

Switch to 1-phase:

alias: Webasto Schnellladen Aus
description: ""
triggers:
  - trigger: state
    entity_id:
      - input_boolean.schnellladen
    from: "on"
    to: "off"
conditions: []
actions:
  - action: shell_command.schnellladen_session
    data: {}
  - action: shell_command.schnellladen_aus
    data: {}
mode: single

Switch to 3-phase:

alias: Webasto Schnellladen Ein
description: ""
triggers:
  - trigger: state
    entity_id:
      - input_boolean.schnellladen
    from: "off"
    to: "on"
conditions: []
actions:
  - action: shell_command.schnellladen_session
    data: {}
  - action: shell_command.schnellladen_ein
    data: {}
mode: single

To check if this works, you can refresh the Wallbox Web UI and see if the 1/3-phase operation has changed.

Have fun with your own automations!