Shelly EM3

@richard-g8jvm wrote:

Hi
Just installed a Shelly EM on my Solar PV system on the grid side of the inverter
now Shelly spec says the current transformer has a 1% accuracy spec, not sure about the EM.
My inverter is saying 2.515KW , EM shows 2.05 KW.
I dont thing the inverter claimed level is too far out as it agrees with the metered amount generated.
So a mathmatical frig needed in the configuration.yaml

  - platform: mqtt
    name: "Solar Power"
    state_topic: "shellies/shellyem-109664/emeter/0/power"
#  value_template: "{{ value|float / 60000 }}" # Fix for Watt-minutes
    qos: 1
    unit_of_measurement: "kW"

you can see where I’ve copied the config from
the ratio of reported values is 1:1.2268
would the correction with a value template be ?

value_template: "{{ value|float * 1.2268 }}"  

The only problem with that is it displays on the guage 2.30643852 KW
Three decimal places is adequate, what do I need to add so it just reads "2.306 KW

TIA

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