Voltage calibration

[lahayeg]

Hello,

I flash with the current version of dev branche. I wanted to start calibration on voltage phase. I already have a Shelly 3 EM which I trust because it has <1% error compare to electricity supplier.
It tried to changed the calibration but still have gap between both Emporia and Shelly

sensor:
  - platform: emporia_vue
    i2c_id: i2c_a
    phases:
      - id: phase_a 
        input: BLACK  
        calibration: 0.02190740741
        voltage:
          name: "Phase A Voltage"
          filters: [*moving_avg, *pos]
        frequency:
          name: "Phase A Frequency"
          filters: [*moving_avg, *pos]
      - id: phase_b  
        input: RED  
        calibration: 0.01085678286  
        voltage:
          name: "Phase B Voltage"
          filters: [*moving_avg, *pos]
      - id: phase_c  
        input: BLUE  
        calibration: 0.02132423208  
        voltage:
          name: "Phase C Voltage"
          filters: [*moving_avg, *pos]

[flaviut]

Did you follow the formula calibration = correct_value * current_calibration / current_value?

Calibrations values here should always be between 0.021 and 0.023. 0.0108 isn't reasonable.

[segdy]

I already have a Shelly 3 EM which I trust because it has <1% error compare to electricity supplier.

Maybe stupid question but how do you know? The most you would know from your electricity supplier is kWh and kW.
Did you measure the lugs with a multimeter? That's how I calibrated mine.

[lahayeg]

Hi,
so I recalculate calibration starting to set 1. now I'm closed for shelly 3 EM. Still need to fine tune a bit more.

@segdy Shelly and Supplier report both kWh. Shelly 3EM and Emporia phase are plug at same place. Shelly report Voltage too.

[MarkoPaasila]

Both my emporiavues (in different locations) show a significantly higher voltage for phase C.
A≃225V
B≃225V
C≃243V.
Is that the case for someone else? I think I need to calibrate it too.