Sensor: Merge several Power meters?

Configuration
1

Hi

Is there any way to merge several sensors measuring power usage into one?
I have 7 z-wave plug measuring my power usage all around the house and it would be nice to create a merged sensor showing the total current usage for example.

I’ve tried the MAX/MIN sensor which only gives me “unknown” value, the statistics wouldn’t even go trough config check with several entities.
3 example names used in my config it someone could help me out with a code for it

sensor.kyl_power_8_8
sensor.pc_power_2_4
sensor.server_power_3_4

//BR Mattias

2

I am pretty sure you can do maths in a template sensor

Create a new sensor that is the sum of the sensors you wish to add

I do something similar to deduct the cumulative rainfall to midnight from current readings to get rain today in my system (just cant show you the config as I am at work right now)

3

I had a calculation for this but it broke with an update.would be nice if someone could figure this out and let us know ?

4

Statistics sensor could help.

5

I think this will make the addition of consumption as well? Would be awesome dude!

6

Would be awesome if you could post an example when you have the time, I’ve been trying but cant get the code right =/

7

This is my sensor for rain today:

  - platform: template
    sensors:
      rain:
        value_template: '{%- if not is_state("sensor.rain_cum","unknown") -%}  {{ ((states.sensor.rain_cum.state | float) - (states.sensor.rain_cum_prior.state | float)) | round(1) }} {%- endif -%}'
        friendly_name: 'Rain Today'
        unit_of_measurement: 'mm'

So, there are 2 sensors already: rain_cum-prior and rain_cum.

Test if there is a value for rain_cum_prior (otherwise I can end up with negative rain if it is not currently initialised).

Then convert the values to float to allow the maths to happen consistently, which is rounded to 1 dp

1 Like
8

Thanks alot Phileep!
No problems at all tweaking that code :slight_smile:

Here is my code if anyone needs to do the same, i removed the if statement in phileeps code since i dont need it.

platform: template
sensors:
  total_power_usage:
    value_template: '{{ ((states.sensor.pc_power_2_4.state | float) + 
    (states.sensor.server_power_3_4.state | float) + 
    (states.sensor.frys_power_7_8.state | float) + 
    (states.sensor.kyl_power_8_8.state | float) + 
    (states.sensor.soffa_power_6_8.state | float) + 
    (states.sensor.sovrum_power_10_8.state | float) + 
    (states.sensor.tvattmaskin_power_9_8.state | float) + 
    (states.sensor.tvsovrum_power_5_8.state | float)) | round(1) }}'
    friendly_name: 'Total power usage'
    unit_of_measurement: 'w'
11 Likes
9

Thanks will try my friend