Shell 3EM - single phase - No Neutral

    • Autor

    Hello everyone

    I am currently looking into the Shelly options to monitor my energy consumption.

    I was wondering whether or not the Shelly 3EM is an option in my situation, which (I think) is comparable to the situation mentioned in this topic but I did not want to hijack that topic.

    Incoming:

    My board mentions 2x230v, this has no neutral (I always thought the blue cable was supposed to be neutral)

    I wanted to have a power measurement of the consumption while taking into account the production of my solar array.

    I know the 3EM is focuses on multiple phases but this diagram seems to be the situation I am in.

    Is this something that the Shelly 3EM (or EM) supports?

    Thanks in advance!

    Some visuals:

    cable connection after the (analog) consumption meter:

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    Main breaker:

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    Incoming my electrical board, main differential:

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    Bridge at my main differential:

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    Einmal editiert, zuletzt von JanVG (21. September 2022 um 13:11)

    Obviously, the blue wire can be considered as neutral wire, also the grey wire after the RCD (bridged at the input of RCD). Thus, this diagram would fit:

    448-ar768-einphasige-wandlermessung-png

    To measure the total consumption, only one current clamp is necessary. But you may use the remaining clamps to determine the consumption of particular consumers.

    And, by the way: Welcome to the forum!

    „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)

    • Autor

    Hello thgoebel

    Thanks you for your welcome and very quick response.

    Is my assumption correct that for each clamp (IA,IB,IC) I need one live wire into a V-port?

    So if I only use 1 clamp on IA I need to put one cable in VA?

    If i were to put it behind an existing breaker in my board, would this be a correct wiring (without a clamp for the solar array)

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    The live wire from the breaker to VA

    The neutral wire from the breaker to N

    A clamp on the black wire (not sure about this?) to IA

    To add a measurement for solar:

    wago on live wire and add a cable to VB?

    Clamp from IB to live wire of the solar array, direction inverter -> breaker for the solar array?

    Thanks in advance and sorry for the many questions :D

    Zitat von JanVG

    Is my assumption correct that for each clamp (IA,IB,IC) I need one live wire into a V-port?

    So if I only use 1 clamp on IA I need to put one cable in VA?

    Yes, indeed!

    Agree with your thoughts to install the clamps and voltage pick up. But you should consider to use a Shelly EM if you want to measure not more than two power consumptions at one phase. It would be cheaper…

    „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)

    • Autor

    Thank you for your input!

    I think I know enough to get some measurements going and feed the data into my home assistant.

    On a sidenote, I have been looking into the EM instead of the 3EM, but the availability seems to be an issue. I will find a use for the third clamp f.e. measuring a circuit where some older appliances are present might be insightful.

    Thanks again!