Virtual Meter Device with manipulate Value

Configuration
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#1

Hi Everybody,
I am using to detect my power consumption of my PV an Sonoff device. Everything works fine, flashed tasmo.
but I have one issue, my Electric converter needs 8w if the PV doesn’t produce Power.
So i have in my Metering at night 8w which will detect as production, how can I Create an device which will have the same prop of the sensor but remove 8w.
can someone help me?

I hope I wrote the Explanation correct and understandable…

greetings
Simon

#2 
template:
  - sensor:
      - name: "Corrected PV Power"
        unit_of_measurement: "W" # or kW
        state_class: measurement
        device_class: power
        state: "{{ states(sensor.your_pv_power_sensor_here')|float(0) - 8 }}"
        availability: "{{ states(sensor.your_pv_power_sensor_here')|is_number }}"
1 Like
#3

I have following issue

Logger: homeassistant.config
Source: config.py:867
First occurred: 09:18:37 (1 occurrences)
Last logged: 09:18:37

Invalid config for [template]: invalid template (TemplateSyntaxError: unexpected char "'" at 44) for dictionary value @ data['sensor'][0]['state']. Got "{{ states(sensor.sensor.tasmota_energy_power')|float(0) - 8 }}". (See /config/configuration.yaml, line 60).

   sensor:
      - name: "Justiert"
        unit_of_measurement: "W"
        state_class: measurement
        device_class: power
        state: "{{ states(sensor.sensor.tasmota_energy_power')|float(0) - 8 }}"
#4

Oops. Missing a single quote. Should be:

state: "{{ states('sensor.sensor.tasmota_energy_power')|float(0) - 8 }}"
1 Like
#5

no my fault, i have to check better what i copy paste, thanks for help tom.

#6

Nah, it was missing in my posted config. Make sure you fix both templates.

#7

how do you mean both templates?
currently it shows unknown, no formatting issues but the value will not calc,

#8

Both the availability and state templates are missing the first ’ as I copied and pasted the state template into the availability template when I wrote it to save time.