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Tesla Solar Charger

Home Assistant Blueprint to charge Tesla car using surplus solar electricity and weather forecast.

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Disclaimer:

Even though this automation has been created with care, the author cannot be responsible for any damage caused by this automation. Use at your own risk.

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Screenshot_20230702-094232_Home Assistant

Screenshot_20230630-135925_Home Assistant

Installation

  • Set up "Grid Power Net" sensor in Home Assistant (HA) config, eg.

/config/configuration.yaml

template:

    # For Enphase, grid_power_net is an integer in watts. Positive value means importing power from grid. Negative value means exporting power to grid.
    # For other inverter brands, adjust the formula to conform with above requirement according to your setup.
    - sensor:
        name: Grid Power Net
        state_class: measurement
        icon: mdi:transmission-tower
        unit_of_measurement: W
        device_class: power
        state: >
            {{ states('sensor.envoy_[YourEnvoyId]_current_power_consumption')|int - states('sensor.envoy_[YourEnvoyId]_current_power_production')|int }}

  • Copy the Blueprint file to, \HOMEASSISTANT\config\blueprints\automation\flashg\Tesla_solar_charger_automation.yaml

  • Restart HA.

  • Create 3 helper booleans, eg. Settings > Devices & Services > Helpers > Create Helper > Toggle

  1. Tesla Model3 set daily car charge limit
  2. Telsa Model3 charge from grid
  3. Tesla Model3 stop charging
  • Config the Blueprint automation specifying charger voltage, maximum current and helper booleans created above, ie. Settings > Automations & Scenes > Blueprints > Tesla solar charger automation

My setup

Features

  • Charge from excess solar adjusting Tesla car charging current according to feedback loop value "Grid Power Net". The "Grid Power Net" sensor expresses negative power in Watts when exporting to grid, and positive power when consuming from grid.
  • Support multi-day solar charging using sun elevation triggers to start and stop. (Sun elevation triggers should be more favourable for countries in the northern hemisphere.)
  • Compatible with off-peak night time charging.
  • Configurable daily car charge limit for 7 days. Default is to use the Tesla app charge limit.
  • Automatically adjust to the highest charge limit set within a rainy forecast period. The highest charge limit is selected from the 7 days charge limit settings that are within the forecast period taking into account the charge limit on bad weather setting. The objective is to charge more before a rainy period. Default disabled.
  • Might be possible to prolong car battery life by setting daily charge limit to 70%, and only charge more before a rainy period by enabling option to adjust daily car charge limit based on weather.
  • Allow top up from grid if there is not enough solar electricity. Need to toggle on charge from grid and set daytime/nighttime power offsets to draw power from grid.

How to use

  • Set your charging limit in app or car.
  • Connect charger to car. Normal charging at constant current should begin immediately if schedule charging is disabled. After a little while, the script will take over and manage the charging current during daylight hours. Please see work-arounds below if automation cannot be triggered.
  • There are 2 options on how to charge the car (see below).
  • The script will stop if charger is turned off manually or automatically by car when reaching charge limit.
  • To abort charging, turn on "Tesla Model3 stop charging". The script will take about a minute to terminate if using default values.

2 options on how to charge the car:

Option 1

To charge from excess solar, just plug in the charger. The initial charge current is 5A. After about 1 minute it will adjust the current according to amount of excess power exported to grid.

Option 2

To charge from grid and solar, toggle on charge from grid and set daytime/nighttime power offsets to draw power from grid.

Notes

Please also check out the wiki pages.

Automation cannot be triggered

The Tesla triggers and conditions are slow to update unless car is polled often. Polling too often can drain the car battery. So might have to wait a minute or two for the conditions to refresh and the triggers to work. Please see below for possible work-arounds.

Work-arounds:

  1. Run the automation manually by selecting the automation and then select "Run Actions".
  2. Turn polling off, then on.
  3. Press the "Force data update" button before and after plugging in the charger.

Daily car charge limit settings

  • If set daily car charge limit is toggled off, charge limit will be set according to the Tesla app.
  • If set daily car charge limit is toggled on and charge car based on weather is disabled, charge limit will be set according to the limit configured for the day. If necessary, user can manually override the charge limit setting within 30 seconds after it has been set by this automation.
  • If set daily car charge limit is toggled on and charge car based on weather is enabled, charge limit will be adjusted to the highest limit set within the rainy forecast period taking into account the car charge limit on bad weather setting. If necessary, user can manually override the charge limit setting within 30 seconds after it has been set by this automation.
  • If charge car based on weather is enabled, daily car charge limit and weather provider settings must be configured.

GUI display examples

Dashboard Tesla power card

https://github.com/reptilex/tesla-style-solar-power-card

type: custom:tesla-style-solar-power-card
name: Power Usage
show_w_not_kw: 1

# 3 flows between bubbles
grid_to_house_entity: sensor.grid_power_import
generation_to_grid_entity: sensor.grid_power_export
generation_to_house_entity: sensor.solar_power_consumption

# optional appliances with consumption and extra values
appliance1_consumption_entity: sensor.charger_power
appliance1_extra_entity: sensor.battery

# optional 3 main bubble icons for clickable entities
grid_entity: sensor.grid_power_net
house_entity: sensor.envoy_[YourEnvoyId]_current_power_consumption
# Watch this for car charge limit change
house_extra_entity: number.charge_limit
generation_entity: sensor.solar_power_production

Dashboard Tesla solar charger control

type: entities
entities:
  - entity: automation.[YourTeslaName]_solar_charger_automation
  - type: attribute
    entity: automation.[YourTeslaName]_solar_charger_automation
    attribute: current
    name: Running instance count
  - type: attribute
    entity: automation.[YourTeslaName]_solar_charger_automation
    attribute: last_triggered
    name: Last triggered
  - entity: input_boolean.[YourTeslaName]_charge_from_grid
  - entity: input_boolean.[YourTeslaName]_stop_charging
  - entity: button.wake_up
  - entity: button.force_data_update
  - entity: device_tracker.location_tracker
  - entity: binary_sensor.charger
  - entity: binary_sensor.charging
  - entity: number.charging_amps
  - entity: sensor.range
  - entity: sensor.battery
  - entity: number.charge_limit
  - entity: sensor.time_charge_complete
  - entity: lock.charge_port_latch