How to connect when I inted to monitor power consuption only?

    Hi,

    I've bought a couple Shelly devices, but didn't installed them yet, as I've doubts about the connections...
    Looking at the simplest one - Shelly Plus 1PM

    I want to use this device to monitor the power consumption of a multi split A/C system. I only want to monitor the consumed power, as IMO it would be useless to use it to switch on/off the exterior multi split unit which controls three interior units in different rooms.
    As such I know I need to connect N, L and O to my load (the A/C exterior unit). As I won't use an external switch, I guess I should do a short betwwen a second L line and SW, so that my unit is permanently powered.
    Am I thinking this right?

    Many thanks!

    Fernando

    Welcome to the forum!

    To your question: Please do yourself (and us) the favour to choose a Shelly device for monitoring electrical energy which is made for this purpose: Get a Shelly EM with a current clamp and be happy! Shelly 1PM (and Shelly plus 1PM) are well suited to switch devices on and off and to register along the way energy consumption. Even if you would connect SW with L you may switch the unit off inadvertently with the app or the WebUI!

    „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)

    „Es reicht nicht“, rief Schiller, „Gedankenfreiheit zu fordern, man muß auch denken können, sonst fordert man Gedankenlosigkeitsfreiheit und die ist die Freiheit zur Dummheit, welche wiederum die schlimmste Unfreiheit überhaupt ist!“
    (Aus „Besuch aus Weimar“ von Gert Heidenreich, Schriftsteller, *1944 in Eberswalde)

    Zitat

    you may switch the unit off inadvertently with the app or the WebUI!

    Here there would still be the security measure with entering a PIN code that prevents accidental switching

    Thank you for your answers!

    I've been considering "Shelly Plus 1PM" rather than "Shelly EM" for this purpose, because "Shelly Plus 1PM" is a lot cheaper than "Shelly EM" and well within required power range. No need to measure 50/120A not even close (it looks like an elephant to kill a mosquito), while the measures should be less accurate in the needed operating range.
    To avoid unadvert switch off I considered removing the action button from the respective widget card. But Olsche hint about using a PIN code looks even better, thanks!

    1) From your answers I understand a wire between L and SW would do the job, right?
    2) Or in alternative can I skip such wire and set device to "Auto On" (inspired from hints into another thread I found meanwhile)? It would be on after power is applied, and then I'd protect a switch off via PIN setting.

    Many thanks!

    Fernando

    Method 2 is much cheaper - you'll need no additional wire! 8)

    „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)

    „Es reicht nicht“, rief Schiller, „Gedankenfreiheit zu fordern, man muß auch denken können, sonst fordert man Gedankenlosigkeitsfreiheit und die ist die Freiheit zur Dummheit, welche wiederum die schlimmste Unfreiheit überhaupt ist!“
    (Aus „Besuch aus Weimar“ von Gert Heidenreich, Schriftsteller, *1944 in Eberswalde)

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