Negative values

    Hello all 3EM friends!

    I'm a newbie when it comes to Shelly 3EM and installed it just a week ago. In fact, it was plugged in by an electrical company that did some other work in the house. I have read about negative values and misdirected clamps and just negative values are my problem (see attached screenshot). We checked and double checked and the clamps are correctly mounted.
    I have no problem with flipping the clamps, at least maybe phase A and C, but wonder how it can be that the values are displayed incorrectly?

    If I compare the electricity company's daily values, they are about twice as high compared to the Shelly.
    The only three-phase consumers that are / have been in operation, are an air / water heat pump, the stove and a flow-through water heater, and it is only connected briefly when using a washbasin far from the regular water heater.

    We do not supply any energy from any solar cells.
    The electricity meter (connection to the power grid) is located on the outside of the building and the clamps are plugged in     before the main switch in the central inside the house.

    I am more than grateful for the help I can get!
    (The values below are quite typical).

    PowerCon. 2022-11-07 22-36-29.png

    Einmal editiert, zuletzt von Janne Bild (8. November 2022 um 13:32) aus folgendem Grund: NEW FACTS 2022 11 08

    Welcome to the forum, Janne!

    To your issue: It seems very likely your current clamps are not correctly matched with the voltage pins of Shelly 3EM: Voltage Pin VA has to be connected with the same wire the current clamp A is mounted on. The same is obligatory for pin VB, which needs a match with clamp B. The remaining pin VC and clamp C is rather simple, if the principle is well understood…

    This can be concluded by the quite strange looking power factors in your screenshot…

    „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)

    That seems to have solved my problem!

    Thank you!

    I made it a bit easy for me and just shifted the clamp connections (B and C) where the are connected to the Shelly unit.
    Offcourse the correct solution would be to shift the phase wires connected to the breakers, but there is a bit of lack of space so that will be done later :)

    Thank you again - now I can really check our expencive kWh :)

    PowerCon.2022-11-08 15-05-52.png

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