Enabling / disabling DESS via Home Assistant / MQTT

Q&A and troubleshooting DESS
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Ahh, I found the problem.

The topic victron/N/<VRM ID>/system/0/DynamicEss/Active is not editable, even with the victron/W/<VRM ID>/system/0/DynamicEss/Active. I’m not sure what this topic covers as after more time, I’ve realised it doesn’t always reflect reality.

The topic W write path is actually victron/W/<VRM ID>/settings/0/Settings/DynamicEss/Mode where 0 is disabled and 1 is enabled. I’m not sure what the values 2 to 4 mean as they’re valid states apparently.

The same topic but with N should be used to poll current status.

The working YAML is:

mqtt:
  switch:
    - name: "Victron AC Power Toggle"
      unique_id: victron_ac_power_toggle
      state_topic: "victron/N/<VRM ID>/settings/0/Settings/CGwacs/AcPowerSetPoint"
      value_template: >
        {% if value_json.value == -5000 %}
          ON
        {% else %}
          OFF
        {% endif %}
      state_on: "ON"
      state_off: "OFF"
      command_topic: "victron/W/<VRM ID>/settings/0/Settings/CGwacs/AcPowerSetPoint"
      payload_on: '{"value": -5000}'
      payload_off: '{"value": -10}'
      retain: true

    - name: "Victron Dynamic ESS"
      unique_id: 0907ca95-e82b-461a-9094-2998a8ec803b
      state_topic: "victron/N/<VRM ID>/settings/0/Settings/DynamicEss/Mode"
      value_template: >
        {% if value_json.value == 1 %}
          ON
        {% else %}
          OFF
        {% endif %}
      state_on: "ON"
      state_off: "OFF"
      command_topic: "victron/W/<VRM ID>/settings/0/Settings/DynamicEss/Mode"
      payload_on: '{"value": 1}'
      payload_off: '{"value": 0}'
      retain: true

It’s now working and also reflects the current state and if I change it in VRM. I’m happy :slight_smile:

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