Home Assistant Automation to trigger charging Tesla with excess solar

hass_solar_automation.yaml

alias: Tesla Daytime Solar Charging
description: Charge Tesla with excess solar during the day
triggers:
  - minutes: /1
    trigger: time_pattern
conditions:
  - condition: and
    conditions:
      - condition: state
        entity_id: binary_sensor.tesla_wall_connector_vehicle_connected
        state: "on"
      - condition: numeric_state
        entity_id: sensor.tesla_battery_level
        below: 80
      - condition: sun
        after: sunrise
        before: sunset
      - condition: or
        conditions:
          - condition: state
            entity_id: switch.tesla_charge
            state: "off"
          - condition: and
            conditions:
              - condition: state
                entity_id: switch.tesla_charge
                state: "on"
              - condition: state
                entity_id: input_boolean.tesla_solar_charging_active
                state: "on"
actions:
  - choose:
      - conditions:
          - condition: and
            conditions:
              - condition: numeric_state
                entity_id: sensor.total_battery_power
                above: 1200
              - condition: numeric_state
                entity_id: sensor.total_pv_power
                above: 1500
              - condition: or
                conditions:
                  - condition: state
                    entity_id: sensor.tesla_wall_connector_status
                    state: ready
                  - condition: state
                    entity_id: sensor.tesla_wall_connector_status
                    state: waiting_car
        sequence:
          - target:
              entity_id: switch.tesla_charge
            action: switch.turn_on
            data: {}
          - target:
              entity_id: input_boolean.tesla_solar_charging_active
            action: input_boolean.turn_on
            data: {}
          - target:
              entity_id: number.tesla_charge_current
            data:
              value: >-
                {% set voltage =
                states('sensor.tesla_wall_connector_grid_voltage') | float(230)
                %} {% set power = states('sensor.total_battery_power') |
                float(0) %} {{ min(max(5, (power / voltage) | round(0)), 32) }}
            action: number.set_value
      - conditions:
          - condition: and
            conditions:
              - condition: numeric_state
                entity_id: sensor.total_battery_power
                above: 500
              - condition: numeric_state
                entity_id: sensor.tesla_charger_current
                below: 32
              - condition: state
                entity_id: sensor.tesla_wall_connector_status
                state: charging
              - condition: state
                entity_id: input_boolean.tesla_solar_charging_active
                state: "on"
        sequence:
          - target:
              entity_id: number.tesla_charge_current
            data:
              value: >-
                {% set current = states('number.tesla_charge_current') |
                float(0) %} {% set voltage =
                states('sensor.tesla_wall_connector_grid_voltage') | float(230)
                %} {% set solar_current = (states('sensor.total_battery_power')
                | float(0) / voltage) | round(0) %} {% set new_current = current
                + solar_current | round(0) %} {{ min(max(5, new_current), 32) }}
            action: number.set_value
      - conditions:
          - condition: and
            conditions:
              - condition: numeric_state
                entity_id: sensor.total_grid_power_w_monitor
                above: 1000
              - condition: state
                entity_id: sensor.tesla_wall_connector_status
                state: charging
              - condition: state
                entity_id: input_boolean.tesla_solar_charging_active
                state: "on"
        sequence:
          - choose:
              - conditions:
                  - condition: numeric_state
                    entity_id: sensor.total_pv_power
                    below: 1300
                sequence:
                  - target:
                      entity_id: switch.tesla_charge
                    action: switch.turn_off
                    data: {}
                  - target:
                      entity_id: input_boolean.tesla_solar_charging_active
                    action: input_boolean.turn_off
                    data: {}
                  - target:
                      entity_id: number.tesla_charge_current
                    action: number.set_value
                    data:
                      value: "32"
              - conditions:
                  - condition: numeric_state
                    entity_id: sensor.total_pv_power
                    above: 1500
                sequence:
                  - target:
                      entity_id: number.tesla_charge_current
                    data:
                      value: >-
                        {% set current = states('number.tesla_charge_current')
                        | float(0) %} {% set grid_power =
                        states('sensor.total_grid_power_w_monitor') | float(0)
                        %} {% set voltage =
                        states('sensor.tesla_wall_connector_grid_voltage') |
                        float(230) %} {% set new_current = current - (grid_power
                        / voltage) | round(0) %} {{ [5, new_current] | max }}
                    action: number.set_value
      - conditions:
          - condition: and
            conditions:
              - condition: numeric_state
                entity_id: sensor.total_grid_power_w_monitor
                below: 300
              - condition: numeric_state
                entity_id: sensor.inverter_combined_battery_soc
                above: 99
              - condition: numeric_state
                entity_id: sensor.total_pv_power
                above: 2000
              - condition: state
                entity_id: sensor.tesla_wall_connector_status
                state: charging
              - condition: state
                entity_id: input_boolean.tesla_solar_charging_active
                state: "on"
        sequence:
          - target:
              entity_id: number.tesla_charge_current
            data:
              value: >-
                {% set current = states('number.tesla_charge_current') |
                float(0) %} {% set voltage =
                states('sensor.tesla_wall_connector_grid_voltage') | float(230)
                %} {% set new_current = current + 2 | round(0) %} {{
                min(new_current, 32) }}
            action: number.set_value
mode: single

Works with Hardware:

• Refoss em16 energy monitor CT on House main
• Deye Hybrid Inverters (Solarman integration)
• Tesla Wall Connector (Type 2, max 32A)

Notes:
Solar export to grid not enabled, so no direct way to determine excess solar available. Uses current usage, house usage, plus excess to batteries as inputs. Uses batteries charge rate to determine excess solar available, and routes that to car. If batteries are full, instead it regularly increments/decrements charge level to balance no grid power being pulled. Some grid power being used is inevitable, but as minimal as possible within the constraints.