HomeAssistant automation for iD4 OctopusEnergy

HomeAssistant automation to determine the % charge necessary to reach the target charge of a VW iD4 and set the Octopus Energy IO Charge to add

My setup

• iD4 GTx
• Myenergi Zappi charger
• OctopusEnergy Intelligent Octopus Go tarriff with Zappi Smart Charging (beta)

Goal

Use HomeAssistant to update the Charge to add percentage value at Octopus when the car returns home based on the delta between the current charge % and the target charge % as set in the car.

Why

Allow Octopus to more accurately map out a Smart Charging schedule based on an actual % value to charge rather than simply always requesting 80% (for instance) and letting the car cut off the charge when it's full.

How

• Install and setup this custom Volskwagen Connect integration through HACS
• Install and setup the OctopusEnergy and Myenergi integrations through HACS

Create a custom sensor:

This sensor grabs the charge % values from the car and subtracts the current charge % from the target charge %. It divides the delta by 10, rounds the value and plusses 1. This increases the the requested charge % value by up to 10% so we have a round number to send to Octopus rather than trying to send them 7%, for instance that wouldn't be requested. The minimum % is also 10%, so we account for that too. The car will cut off/not attempt a charge if full, so it's safe.

template:
  - sensor:
      - name: "Car Charge Percent Remaining"
        unit_of_measurement: "%"
        state: >
          {% if has_value('sensor.id4_gtx_state_of_charge') and has_value('sensor.id4_gtx_target_state_of_charge') %}
            {% if states('sensor.id4_gtx_state_of_charge') != states('sensor.id4_gtx_target_state_of_charge') %}
              {% set current_charge = states('sensor.id4_gtx_state_of_charge') | int %}
              {% set target_charge = states('sensor.id4_gtx_target_state_of_charge') | int %}
              {{ (((target_charge - current_charge )/10) | round +1) *10 }}
            {% else %}
              {{ 10 }}
            {% endif %}
          {% endif %}

Create the automation

This automaion uses the device_tracker.id4_gtx_tracker and triggers when it enters the zone.home zone, then updates the number.octopus_energy_intelligent_charge_limit based on the above sensor value.

alias: iD4 Set Octopus Charge Percent
description: ""
trigger:
  - platform: zone
    entity_id: device_tracker.id4_gtx_tracker
    zone: zone.home
    event: enter
condition: []
action:
  - service: number.set_value
    data_template:
      value: "{{ states('sensor.car_charge_percent_remaining') | float }}"
    target:
      entity_id: number.octopus_energy_intelligent_charge_limit
mode: single