Split a sensor in two template sensors

Configuration
5

I just realised the entity_id is in your original post ( sensor.batterij_input_output ).

template:
  - sensor:
      - name: "Battery Input"
        unit_of_measurement: "A"
        state: >
          {% if states('sensor.batterij_input_output')|float >= 0 %}
            {{ states('sensor.batterij_input_output') }}
          {% else %}
            0
          {% endif %}
      - name: "Battery Output"
        unit_of_measurement: "A"
        state: >
          {% if states('sensor.batterij_input_output')|float < 0 %}
            {{ -1 * states('sensor.batterij_input_output')|float }}
          {% else %}
            0
          {% endif %}

This shows both sensors (input and output) as positive numbers. If you want the output sensor to be negative just remove -1 * from the battery output template.

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