Charge Tesla with Excess Solar

tesla_solar_charging.yaml

sensor:
  - platform: statistics
    name: "Solar Export Median - 1 minute (internal)"
    unique_id: solar_export_median_internal
    entity_id: sensor.solarexport
    state_characteristic: median
    max_age:
      minutes: 1
  - platform: statistics
    name: "Grid Import Median - 1 minute (internal)"
    unique_id: grid_import_median_internal
    entity_id: sensor.gridimport
    state_characteristic: median
    max_age:
      minutes: 1

template:
  # we need these template sensors to extrapolate to zero if no readings are received for the
  # median calculation. This is achieved using the float(0) filter.
  - sensor:
    - name: "Solar Export Median - 1 minute"
      unique_id: solar_export_median
      state: "{{ states('sensor.solar_export_median_internal') | float(0) }}"
      unit_of_measurement: W

    - name: "Grid Import Median - 1 minute"
      unique_id: grid_import_median
      state: "{{ states('sensor.grid_import_median_internal') | float(0) }}"
      unit_of_measurement: W



  - trigger:
      - platform: state
        entity_id: sensor.solar_export_median
      - platform: state
        entity_id: sensor.grid_import_median
    sensor:
      - name: "Tesla Max Charge Rate"
        unique_id: tesla_max_charge_rate
        unit_of_measurement: A
        # 3 phase calculation
        # Amps = Watts / sqrt(3) * Power Factor (1.0) * Voltage (415v)
        #      = Watts * (1/717)
        #      = Watts * 0.0014
        # Logic: update max charge rate based off current amperage and add excess amperage from
        #        export, subtract amperage from import
        state: >
          {{
            [ 0,
              (
                (states('sensor.tesla_wall_connector_max_amps') | float(0)) +
                (states('sensor.solarexport') | float * 0.0014) -
                (states('sensor.gridimport') | float * 0.0014)
              ) | int
            ] | max
          }}

automation:
  - id: 'start_tesla_charge_excess_solar'
    alias: '[Tesla Solar] Start Charging Tesla with excess solar'
    trigger:
      # only start charging if we've had 1 amp (720W~) of excess solar for > 30 seconds
      - platform: numeric_state
        entity_id: sensor.solarexport
        above: 720.0
        for:
          seconds: 30
    condition:
      - "{{ is_state('binary_sensor.tesla_wall_connector_vehicle_connected', 'on') }}"
      - "{{ is_state('binary_sensor.tesla_wall_connector_charge_state', 'off') }}"
      - "{{ is_state('input_boolean.tesla_solar_excess_charging', 'on') }}"
    action:
      - service: script.turn_on
        target:
          entity_id: script.tesla_start_charger
        data:
          variables:
            reason: "Solar Excess"
            notify: false

  - id: 'stop_tesla_charge_excess_solar'
    alias: '[Tesla Solar] Stop Charging Tesla when insufficient solar'
    trigger:
      # stop charging if we've had 1 amp (720W~) of import for > 120 seconds
      - platform: numeric_state
        entity_id: sensor.gridimport
        above: 720.0
        for:
          minutes: 2
    condition:
      - "{{ is_state('binary_sensor.tesla_wall_connector_vehicle_connected', 'on') }}"
      - "{{ is_state('binary_sensor.tesla_wall_connector_charge_state', 'on') }}"
      - "{{ is_state('input_boolean.tesla_solar_excess_charging', 'on') }}"
    action:
      - service: script.turn_on
        target:
          entity_id: script.tesla_stop_charger
        data:
          variables:
            reason: "Insufficient Solar"
            notify: false

  - id: 'set_tesla_charge_speed'
    alias: '[Tesla Solar] Set charge speed (amps)'
    trigger:
      - platform: state
        entity_id: sensor.tesla_max_charge_rate
    condition:
      - "{{ is_state('binary_sensor.tesla_wall_connector_vehicle_connected', 'on') }}"
      - "{{ is_state('binary_sensor.tesla_wall_connector_charge_state', 'on') }}"
      - "{{ is_state('input_boolean.tesla_solar_excess_charging', 'on') }}"
    action:
      service: script.turn_on
      target:
        entity_id: script.tesla_set_charge_rate
      data:
        variables:
          rate: "{{ states('sensor.tesla_max_charge_rate') | float(0) }}"

script:
  tesla_set_charge_rate:
    alias: "[Tesla Solar] set charge rate"
    fields:
      rate:
        description: "Charge rate in Amps"
        example: "5"
        default: "0"
    sequence:
      - service: tesla_custom.api
        data:
          command: CHARGING_AMPS
          parameters:
            path_vars:
              vehicle_id: "{{ state_attr('binary_sensor.venom_online', 'id') }}"
            charging_amps: "{{ rate | int }}"
    mode: single