HomeAssistant Excess Solar/Offpeak/Nordpool charging automation for Tesla

README.md

Hardware

• Shelly 3em
• Tesla Wall Connector (3gen)
• Huawei Solar Inverter
• Tesla Model 3

Automations

There are four charge modes based on input_select.tesla_charger_speed selection:

1. Charge only by excess solar
2. Charge bypass - Fastest mode
3. Offpeak with early stop
4. Nordpool

Automations are triggered based on Tesla Wall Connector state. If using a different charger that does not expose plug connector state, conditions/triggers can be substituted to trigger if Tesla is home and cable is connected. e.g.

    - alias: "Is home"
      condition: state
      entity_id: device_tracker.tesla_location
      state: "home"
    - alias: "Is plugged in"
      condition: state
      entity_id: binary_sensor.tesla_model_3_charger
      state: "on"

automations.yaml

- alias: Tesla Wall Connector connected - turn off charge immediatelly
  description: "When Tesla is connected it starts the charging automatically. Stop chargning unless 'Fastest' is selected. After 15 seconds other automations will take over"
  # todo merge everything into a single automation
  # Other automations (solar/nordpool/offpeak) will trigger 15 seconds after Tesla Wall Connector connected
  trigger:
    - platform: state
      entity_id:
        - binary_sensor.tesla_wall_connector_vehicle_connected
      to:
        - "on"
  condition:
    - condition: state
      alias: "If not vacation"
      entity_id: input_boolean.vacation_mode
      state: "off"
  action:
    - service: button.press
      alias: "Force update car state when cable connected"
      target:
        entity_id: button.tesla_model_3_force_data_update
    - if:
        - condition: state
          entity_id: input_select.tesla_charger_speed
          state:
            # - "Fastest"
            - "Only Solar"
            - "Nordpool"
            - "Offpeak"
      then:
        - service: switch.turn_off
          target:
            entity_id: switch.tesla_model_3_charger


- id: tesla_offpeak_charge
  alias: Tesla Charge mode - Offpeak
  description: During the offpeak hours (utility_meter integration), turn on charging at max current to reach the 70% battery limit
  trigger:
    - platform: homeassistant
      event: start
    - entity_id: utility_meter.daily_house_energy
      platform: state
      to: "offpeak"
    - platform: state
      for:
        seconds: 15
      entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
      to: "on"
    - platform: state
      entity_id: input_select.tesla_charger_speed
      to: "Offpeak"
  condition:
    - condition: state
      alias: "If not vacation"
      entity_id: input_boolean.vacation_mode
      state: "off"
    - alias: "Offpeak rate"
      condition: state
      entity_id: utility_meter.daily_house_energy
      state: "offpeak"
    - alias: "Charge Cable plugged in"
      condition: state
      entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
      state: "on"
    - alias: "Offpeak charge mode selected"
      condition: state
      entity_id: input_select.tesla_charger_speed
      state: "Offpeak"
  action:
    - delay: 00:01:00
    - service: switch.turn_on
      target:
        entity_id: switch.tesla_model_3_charger
      
    - service: number.set_value
      alias: Set charging amps to max
      data:
        value: '{{ state_attr("number.tesla_model_3_charging_amps", "max") }}'
      target:
        entity_id: number.tesla_model_3_charging_amps
    - choose:
        - alias: "Set charge limit to 70%, if it is not set to 100%"
          conditions: "{{ (states('number.tesla_model_3_charge_limit') |int(0)) < 100 }}"
          sequence:
            - service: number.set_value
              data:
                value: 70
              target:
                entity_id: number.tesla_model_3_charge_limit

- alias: Tesla Charge mode - Offpeak (stop)
  id: tesla_stop_peak_charge              
  description: Stop charging when offpeak tariff ends and we don't need max range
  trigger:
    - entity_id: utility_meter.daily_house_energy
      platform: state
      from: "offpeak"
      to: "peak"
  condition:
    - condition: state
      alias: "If not vacation"
      entity_id: input_boolean.vacation_mode
      state: "off"
    - alias: "Charge Cable plugged in"
      condition: state
      entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
      state: "on"
    - alias: "Offpeak charge mode selected"
      condition: state
      entity_id: input_select.tesla_charger_speed
      state: "Offpeak"
  action:
    - entity_id: switch.tesla_model_3_charger
      service: switch.turn_off

- alias: Tesla Charge mode - Offpeak (early stop)
  description: If the predicted solar production is high, stop offpeak charging when reached 60% and continue the charge (60% to 95%) later in the day.
  id: tesla_stop_peak_charge_early
  trigger:
    - entity_id: sensor.tesla_model_3_battery
      platform: numeric_state
      above: 60
      for:
        minutes: 1
  condition:
    - condition: state
      alias: "If not vacation"
      entity_id: input_boolean.vacation_mode
      state: "off"
    - alias: "Tesla at home"
      condition: state
      entity_id: device_tracker.tesla_location
      state: "home"
    - alias: "Offpeak rate"
      condition: state
      entity_id: utility_meter.daily_house_energy
      state: "offpeak"
    - alias: "Predicted high solar production today"
      condition: numeric_state
      entity_id: sensor.energy_production_today
      above: 50
  action:
    - entity_id: switch.tesla_model_3_charger
      service: switch.turn_off

- alias: Tesla Charge mode - Fastest
  id: tesla_fast_charge
  description: When the "Fastest" is selected, charge immediatelly on max current to 100% 
  trigger:
    - platform: homeassistant
      event: start
    - platform: state
      for:
        seconds: 15
      entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
      to: "on"
    - platform: state
      entity_id: input_select.tesla_charger_speed
      to: "Fastest"

  condition:
    - condition: state
      alias: "If not vacation"
      entity_id: input_boolean.vacation_mode
      state: "off"
    - alias: "Charge Cable plugged in"
      condition: state
      entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
      state: "on"
    - alias: "Fastest charge mode selected"
      condition: state
      entity_id: input_select.tesla_charger_speed
      state: "Fastest"
  action:
    - service: switch.turn_on
      target:
        entity_id: switch.tesla_model_3_charger
    - service: number.set_value
      alias: "Set charging amps to max available"
      data:
        value: '{{ state_attr("number.tesla_model_3_charging_amps", "max") }}'
      target:
        entity_id: number.tesla_model_3_charging_amps
    - alias: "Set charge limit to 100%"
      service: number.set_value
      data:
        value: 100
      target:
        entity_id: number.tesla_model_3_charge_limit

- alias: Tesla Charge mode - Nordpool
  description: "Will charge based on EV Smart Charging integration (Nordpool)"
  trigger:
    - platform: state
      for:
        seconds: 15
      entity_id:
        - binary_sensor.tesla_wall_connector_vehicle_connected
      to:
        - "on"
        - "off"
  condition:
    - condition: state
      alias: "If not vacation"
      entity_id: input_boolean.vacation_mode
      state: "off"
    - alias: "Nordpool charge mode selected"
      condition: state
      entity_id: input_select.tesla_charger_speed
      state: "Nordpool"
  action:
    - service: button.press
      target:
        entity_id: button.tesla_model_3_force_data_update
    - delay: 00:00:05
    - if:
        - condition: state
          entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
          state: "on"
      then:
        - if:
            - condition: state
              entity_id: sensor.ev_smart_charging_charging
              state: "off"
          then:
            - service: switch.turn_off
              target:
                entity_id: switch.tesla_model_3_charger
          else:
            - service: switch.turn_on
              target:
                entity_id: switch.tesla_model_3_charger

        - service: switch.turn_on
          data: {}
          target:
            entity_id: switch.ev_smart_charging_ev_connected
      else:
        - if:
            - condition: state
              entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
              state: "off"
          then:
            - service: switch.turn_off
              data: {}
              target:
                entity_id: switch.ev_smart_charging_ev_connected
  mode: single

- alias: Tesla Charge mode - Only Solar
  id: smart_solar_charge_tesla
  description: "To only use excess power from solar, limit the number of Amps Tesla charger use. We'll stop charging if it drops below 5A"
  trigger:
    - platform: time_pattern
      minutes: "/1"
      #  This will run automation every minute
    - platform: state
      for:
        seconds: 15
      entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
      to: "on"
    - platform: state
      entity_id: input_select.tesla_charger_speed
      to: "Only Solar"
  condition:
    - condition: state
      alias: "If not vacation"
      entity_id: input_boolean.vacation_mode
      state: "off"
    - alias: "Is plugged in"
      condition: state
      entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
      state: "on"
    - alias: "Sun is shining"
      condition: numeric_state
      entity_id: sensor.elevation
      above: 5
    - alias: "Charge mode 'Only Solar' selected"
      condition: state
      entity_id: input_select.tesla_charger_speed
      state: "Only Solar"
  variables:
    # Calculate ideal charging amps, so it would only use electricity from solar, we should set the Tesla charger to
    # AMPS = (current power usage (i.e. -2000W) + 200W overhead, converted to amps)
    amps: '{{ [[((states("sensor.tesla_charger_actual_current")|int(0)) - ((max([states("sensor.shelly_channel_b_power")|float(0), states("sensor.shelly_channel_c_power")|float(0), states("sensor.shelly_channel_a_power")|float(0)]) + 200) / (states("sensor.shelly_channel_a_voltage")|int(0)))|int(0)),0]|max, state_attr("number.tesla_model_3_charging_amps", "max") | int(0) ]|min }}'
    # Above is for three phase charging. Optimal current is calculated from the phase which is most loaded.
    # For single phase chargers, only a single phase needs to be measured - in my case Channel B
    # '{{ [[((states("sensor.tesla_charger_actual_current")|int(0)) - ((states("sensor.shelly_channel_b_power")|float(0) + 200) / (states("sensor.shelly_channel_b_voltage")|int(0)))|int(0)),0]|max, state_attr("sensor.tesla_model_3_charging_rate_sensor", "charge_current_request_max") | int(0) ]|min }}'
    # todo: More optimal calculation may be possible?
  action:
    - choose:
        - alias: "Enough energy to charge"
          conditions: "{{ amps >= 3 }}"
          sequence:
            - choose:
                - alias: "Turn on charger if off"
                  conditions:
                    - condition: state
                      entity_id: switch.tesla_model_3_charger
                      state: "off"
                  sequence:
                    - entity_id: switch.tesla_model_3_charger
                      service: switch.turn_on
            - choose:
                - alias: "Update Current if changed"
                  conditions:
                    - "{{ amps >= 3 and amps != (states('sensor.tesla_charger_actual_current')|int(0)) }}"
                  sequence:
                    - service: number.set_value
                      data:
                        value: "{{ amps }}"
                      target:
                        entity_id: number.tesla_model_3_charging_amps
      # ELSE (Turn off charging charging - it seems to be too slow below 3A (5A for single phase))
      default:
        - choose:
            - alias: "Turn off charger if on"
              conditions:
                - condition: state
                  entity_id: switch.tesla_model_3_charger
                  state: "on"
              sequence:
                - entity_id: switch.tesla_model_3_charger
                  service: switch.turn_off
    - choose:
        - alias: "Set charging limit to 100%" # For SR+, 100% is optimal
          conditions: "{{ (states('number.tesla_model_3_charge_limit') |int(0)) < 95 }}"
          sequence:
            - service: number.set_value
              data:
                value: 100
              target:
                entity_id: number.tesla_model_3_charge_limit

input_select.yaml

tesla_charger_speed:
  name: Charge method
  options:
    - "Fastest"
    - "Only Solar"
    - "Nordpool"
    - "Offpeak"
  initial: Only Solar
  icon: mdi:ev-station