Sensor when dynamic electricity tariff is inexpensive (adjustable)

[distanzcheck]

Description

I would like a sensor that triggers ON when the dynamic electricity tariff is inexpensive (adjustable) and triggers OFF again when it becomes more expensive. I would then like to use this to build an automation in HA. Is this possible?

API Keys

[marq24]

Have you ever worked with template sensors? Since by comparing sensor.evcc_tariff_grid (current pice) and number.evcc_[loadpoint_id]_smart_cost_limit in a template this is IMHO all you need

[distanzcheck]

Do you have a template or a link for that?

[distanzcheck]

No, I haven't worked with template sensors yet. I'll have to look into how this works. If the price is right, I'd like to switch on a Tuya switch with integration, and switch it off again if the price is too high.

[UDicke]

@distanzcheck , this is my solution:

part(s) of my configuration.yaml

  - platform: template
    sensors:
      evcc_aktueller_min_price:
        unique_id: unterbraker_weg_48_aktueller_min_price 
        friendly_name: "EVCC aktueller Min-Preis"
        unit_of_measurement: "EUR/kWh"
        value_template: >
          {% set raw = state_attr('sensor.evcc_tariff_api_grid', 'rates') %}
          {% if not raw %}
            unknown
          {% else %}
            {% set now = (now().timestamp() | int) %}
            {% set future = raw | selectattr('start_utc','>=', now) | list %}
            {% if future | length == 0 %}
              unknown
            {% else %}
              {{ (future | map(attribute='value') | min) | round(4) }}
            {% endif %}
          {% endif %}

#Sensor will be "true" or "false"
  - platform: template
    sensors:
      unterbraker_weg_48_price_low:
        friendly_name: "Strompreis niedrig"
        value_template: >
          {% set current = states('sensor.unterbraker_weg_48_strompreis') | float(0) %}
          {% set minv = states('sensor.evcc_aktueller_min_price') | float(0) %}
          {{ current <= (minv * states('input_number.faktor_strompreis_niedrig') | float ) }}
#Sensor just for information     
  - platform: template
    sensors:
      strompreis_niedrig_eur:
        friendly_name: "Strompreis niedrig EUR"
        unit_of_measurement: "EUR/kWh"
        value_template: >-
          {{ ((float(states('sensor.evcc_aktueller_min_price'))) * 
              (float(states('input_number.faktor_strompreis_niedrig')))) | round(4) }} 
			  
#Entity to adjust factor via UI when there is a need			  
input_number:
  faktor_strompreis_niedrig:
    name: Faktor Strompreis niedrig
    initial: 1.05
    min: 1.0
    max: 1.15
    step: 0.01

...and "discussion" would be a better place 😊