3 Pro 4PM to monitor consumptiuon of 400v device?

    Not really! With three Shelly pro 4PM devices connected at three phases, measuring of power factor isn’t possible, cause the devices don’t share this value with each other. You may measure apparent power only.

    Another question: Do you really have a voltage of 400 volts between phase and neutral?

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

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    • Autor

    Thank yoiu, that is a good point/ question.

    No, there will only by 230v between phase and N so the pro4pm should survive.

    I dunno if PF measuring will be relevant in heatpump with inverter, should be close to 1 hopefully.

    Wouldn’t a Shelly pro 3EM do the job?

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Comment is free, but facts are sacred“ (C.P. Scott, britischer Verleger)

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