ESPHome “pulse_meter” counting less?

ESPHome
2

Assuming that your measuring device outputs 1000 pulses per kWh your code should be correct.
However, looking at your results it looks like there is a reduction of approx. 20 %, and this difference is reasonable constant over these three months:

afbeelding

So how sure are you about the 1000 pulses / kWh?
What kind of power sensor is this? Is it a S0 pulse meter?
One solution could be to modify your filters such that the measured value comes closer to the real value, by multiplying the filter values by 1.23 like this:

sensor:
  - platform: pulse_meter
    pin: 12
    unit_of_measurement: 'kW'
    name: 'Electricity Usage'
#    internal_filter: 100ms
    accuracy_decimals: 3
    filters:
      - multiply: 0.0738
    total:
      name: "Electricity Total"
      unit_of_measurement: "kWh"
      accuracy_decimals: 3
      filters:
        - multiply: 0.00123

Another option to try is enabling the internal_filter setting and set it to 50 or 100 ms, which is recommended for S0 pulse meters.

A third option could be to change the Pulse Meter Sensor into a Pulse Counter Sensor, but I don’t expect this will make a difference in this case. The difference between these two sensors is nicely explained here: ESPHome_Pulse_counter vs pulse_meter.

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