Utility meter with shelly 3em doesnt seem to be correct

Configuration
1

Hi ,

I bought a shelly 3em to collect my energy/power usage. Shelly itself seems to be working and be pretty accurate.

It is installed on my 3 phases but inside HA I just want to see the total energy consumption.

I’ve created the following utility_meter

utility_meter:
  daily_energy:
    source: sensor.power_total
    cycle: daily
    tariffs:
      - mono

And some sensors where
power_total - getting all 3 phases into a single value.
energy_daily_usage - shows the utility_meter daily_energy_mono in kwh.

sensor:
  - platform: template
    sensors:
      power_total:
        friendly_name: 'Strømforbrug lige nu'
        value_template: "{{(
          (
            states('sensor.stue_kokken_vaerelser_power') | float + 
            states('sensor.badevaerelse_gang_power') | float + 
            states('sensor.teknik_kol_vask_power') | float 
          ) 
        )}}"
        unit_of_measurement: "wh"
  - platform: template
    sensors:
      energy_daily_usage: 
        value_template: "{{(( states('sensor.daily_energy_mono') | float * 1 / 1000) | round(1) )}}"
        friendly_name: 'Strømforbrug/Dag'
        unit_of_measurement: 'kwh'

Here are the sensors

unit_of_measurement: W
friendly_name: Stue-Køkken-Værelser Power
device_class: power

unit_of_measurement: W
friendly_name: Badeværelse-Gang Power
device_class: power

unit_of_measurement: W
friendly_name: Teknik-Køl-Vask Power
device_class: power

It’s all great and have been running for some days now , but …
right know at 11’o clock my sensor energy_daily_usage says I’ve used 6KWH - I guess that should be from midnight? so 11 hours of consumption?
shelly however says i’ve used 3KWH the last 24H

the power_total sensor seems to be correct. Says the same as shelly itself.

What am I missing ?

BONUS QUESTION: How do I reset the utility_meter? I’ve been looking at the documentation but I need a little more help.
The “remove it from config, restart, and add it back in” doesnt seem to be working - it remembers

2

While I was writing the post I was wondering if it is because I specified that power_total is unit_of_measurement: “wh” but the shelly sensors is unit_of_measurement: W ?

3

The utility meter has to be used with energy sensors, (kWH) not power sensors (W).

4

hi @tom_l ,

So what you are telling me is that utility meter can calculate the derivative between values stored in ex. sensor.badevaerelse_gang_energy

unit_of_measurement: kWh
friendly_name: Badeværelse-Gang Energy
device_class: energy

So if I create utility meters for each phase’s kwh entity like this:

utility_meter:
  daily_energy_phase1:
    source: sensor.badevaerelse_gang_energy
    cycle: daily
    tariffs:
      - mono
  daily_energy_phase2:
    source: sensor.stue_kokken_vaerelser_energy
    cycle: daily
    tariffs:
      - mono
  daily_energy_phase3:
    source: sensor.teknik_kol_vask_energy
    cycle: daily
    tariffs:
      - mono

and then do like this

- platform: template
    sensors:
      energy_daily_usage: 
        value_template: "{{(
          (
            states('sensor.daily_energy_phase1_mono') | float + 
            states('sensor.daily_energy_phase2_mono') | float + 
            states('sensor.daily_energy_phase3_mono') | float 
          ) 
        )}}"
        friendly_name: 'Strømforbrug/Dag'
        unit_of_measurement: 'kWh'

I should have a correct kWh number each day?

5

No. All it does is watch the total energy sensor and keeps track how much it increases over the specified cycle. For this you must feed it with a strictly always increasing energy used sensor.

Use the total energy sensor from the EM3, not the daily energy sensor.

1 Like
6

Using the utility_meter.reset service.

If you go to Developer Tools and pick the Services tab, you can execute the service from there:

image
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1 Like
7

Thanks for the answer @tom_l - I will try it out and keep an eye on it the next couple of days .

8

@cvester how did it go? And what configuration did you used? Mind sharing? I have the same issue that Shelly app and HA doesn’t match.

- platform: template
  sensors:
    bv_total_consumption:
      friendly_name: 'BV total consumption'
      value_template: "{{ (states('sensor.shelly_bv1_total_energy')|float + states('sensor.shelly_bv2_total_energy')|float + states('sensor.shelly_bv3_total_energy')|float)|round(3) }}"
      unit_of_measurement: "kWh"

Utility meter:

  bv_daily_consumption:
    source: sensor.bv_total_consumption
    cycle: daily
9

Hi @TheLordVader ,

here’s my config:

  #Electricity Daily
  daily_energy_phase1:
    source: sensor.badevaerelse_gang_energy
    cycle: daily
    tariffs:
      - mono
  daily_energy_phase2:
    source: sensor.stue_kokken_vaerelser_energy
    cycle: daily
    tariffs:
      - mono
  daily_energy_phase3:
    source: sensor.teknik_kol_vask_energy
    cycle: daily
    tariffs:
      - mono

      energy_daily_usage: 
        value_template: "{{(
          (
            states('sensor.daily_energy_phase1_mono') | float + 
            states('sensor.daily_energy_phase2_mono') | float + 
            states('sensor.daily_energy_phase3_mono') | float 
          ) | round(2)
        )}}"
        friendly_name: 'Strømforbrug/Dag'
        unit_of_measurement: 'kWh'     
      energy_daily_usage_cost: 
        value_template: "{{(( states('sensor.energy_daily_usage') | float * 1 * 2.3)) | round(0) }}"
        friendly_name: 'Pris for strøm idag'
        unit_of_measurement: 'kr'
1 Like
10

Thank you, I’m in the middle of getting this to work. I assume it works well for you?

Just a question, why use tariffs: mono? I can’t find any place to read about that mono thing… :wink:

 tariffs:
      - mono
11

Tariffs can be any string, but it doesn’t really make sense to specify it if you have only one tariff.

12

I think I just wrote mono because I wanted to reset the utility meter at some point. As far as I can remember is wasn’t possible unless you had some sort of tariff :slight_smile:

1 Like
13

@cvetser tack för svar!!

I just got everything to work after trying various methods and reading numerous threads; until I found your thread and got your config.

Then I’ll leave tariffs: mono alone, I don’t want to mess things up.

Trevlig sommar / Have a nice summer!

14

Hey again @TheLordVader , great to hear that . I always try to share my full config’s whenever I manage to get things working :smiley:

Trevlig sommar to you too :grin:

15

Hmm…I’m quite sure that you can not just add the energy from the 3 phases. You have to divide the result with SQRT(3) to get the actual amount that the electrical company registers (note that this is a good thing, less energy spent!). Here’s my calculation.

    consumed_energy:
      friendly_name: "Total Consumption"
      device_class: energy
      unit_of_measurement: 'kWh'
      value_template: "{{ ((states('sensor.em_channel_a_energy')|float + states('sensor.em_channel_b_energy')|float + states('sensor.em_channel_c_energy')|float)/sqrt(3))|round(2) }}"
      availability_template: "{{ not ( is_state('sensor.em_channel_a_energy', 'unavailable') or is_state('sensor.em_channel_b_energy', 'unavailable') or is_state('sensor.em_channel_c_energy', 'unavailable') ) }}"
16

Hi, interesting. I stumbled accross this when I noticed my 3EM is not reading the same consumption as my energy seller. However, the SQRT(3) does not give me the correct number either… What else can it be?

image
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17

ugh, nevermind it’s a constant

18

try dividing by 2 and multiplying by the sqrt(3)

19

actually multiply the shelly numbers by 0.78 and you’ll be within 10% of the metered numbers.

Can you provide more points?

20

Hi ,

Sorry I didnt have time to look at it.

I just checked my own sensor and compared it to my energy company…

My own sensor without any SQRT(3)
image

My energy company

image
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Seems fine to me :grin: