Measuring 3 phase devices

bule_08

I would like to measure the electricity consumptions of 3 large 3-phase AC units I have. What are my options? Shelly 3em on each I know.

Would the future Shelly 4 Pro Plus work as well? I can't find any information on using 3 phases in one Shelly 4. Would I have to use 3 Shelly 4, one for each phase?

Also, on a 3 phase device, is it too much of a leap to assume each phase uses about the same amount of power, and just multiplying the power consumption on 1 phase by 3. In that case 1 Shelly 3em would work.

Guzzi-Charlie

Hallo bule_08,

WELLCOME TO THE FORUM

The Shelly 4Pro (even the comming 4Pro+) is only for 1-phase operation!

To monitor a 3-phase device you can use one Shelly 3EM. You need to install a current transducer on each of the three phases. Then you will have the consumption per phase and in total for this device monitored (up to 120A/phase).

If the power consumption is less then 10A (Shelly 4Pro) or less then 16A (Shelly 4Pro+) then you can use them for the measurement of the power consumption as well but you will need to install a separate Shelly 4Pro(+) for each phase. If it is only one device you even could use three Shelly 1PM instead.

Measuring 3 phase devices

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