Bosch ebike charger I don’t want to leave our ebike battery charger powered on all the time, so let’s have Home Assistant monitor the charging process and switch off the charger when done.


I used a Tuya TS011F_plug_3 Zigbee wallplug (available under various brand names). It only supports polling for energy consumption, but that is fine for this purpose. The bike charger plugs into this wallplug.


To start charging, connect the battery to the charger and press the “on/off” switch on the wallplug. Once Home Assistant determines that the battery is fully charged, it switches off the wallplug. It also sends a notification to our iPhones / Apple Watches informing us that charging is complete, with the actual amount of energy consumed.


The automation is triggered when the wallplug changes from “off” to “on. Also, it triggers when the power is below 5 Watts for over 10 minutes - this indicates that the battery is charged. You may need to play with these numbers for your specific charger and battery.

At the start of charging, the wallplug energy counter is stored in “sensor.var_schuur_acculader_kwh” (I use the Variables+History integration, but you could also create Helpers to store this value)

When charging is done, the wallplug is switched off. Consumed energy is calculated and sent as part of the notification message.

The Home Assistant automation YAML looks like this:

alias: Schuur - Acculader
description: Fietsaccu lader in de schuur
  - platform: state
      - switch.schuur_acculader
    from: "off"
    to: "on"
    id: schuur_acculader_start
  - platform: numeric_state
    entity_id: sensor.schuur_acculader_power
      hours: 0
      minutes: 10
      seconds: 0
    below: 5
    id: schuur_acculader_finish
condition: []
  - choose:
      - conditions:
          - condition: trigger
            id: schuur_acculader_start
          - service: variable.update_sensor
              replace_attributes: false
              value: "{{ states('sensor.schuur_acculader_energy') }}"
              entity_id: sensor.var_schuur_acculader_kwh
          - service: notify.all_iphones
              title: Fietsaccu
              message: >-
                Acculader is ingeschakeld, beginstand {{
                states('sensor.var_schuur_acculader_kwh') }} kWh.
      - conditions:
          - condition: trigger
            id: schuur_acculader_finish
          - condition: state
            entity_id: switch.schuur_acculader
            state: "on"
          - type: turn_off
            device_id: 4b2c9083c0ffee1d3fffa35ddeadbeef
            entity_id: switch.schuur_acculader
            domain: switch
          - service: notify.all_iphones
              title: "Fietsaccu is opgeladen "
              message: >-
                De fietsaccu is opgeladen met {{ ( ( 1000*
                states('sensor.schuur_acculader_energy')  | float ) - ( 1000*
                states('sensor.var_schuur_acculader_kwh') | float ) ) | round()
                }} Wh, de lader is uitgeschakeld.
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