Jay, I just saw your post concerning use of Shelly energy monitoring devices. Do you have an updated recommendation on which Shelly device to purchase so I can monitor 240 volt devices? Thanks
Joe
Hi @joeengr
There are a number of choices.
Shelly Pro Dimmer 1PM will do 240v, has wired ethernet, and is din rail mountable
If you want to save some money and don’t mind a Wi-Fi device then the Shelly 1PM Gen3 would be an alternative
Hope this helps
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I should have added that, according to the Shelly website, both devices are rated for 240v.
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How does this work? It is my understanding that the Shelly EM on monitors 120V circuits such that you can’t put CTs on the two hots and get a real Amp reading of the 240VAC circuit.
But you can monitor one 120V leg of the circuit, so do you just multiply that by two to get an approximate readingm
You can get an amp reading from two CTs on the hots - the only issue is they’re really split-phase 120v so the reference voltage needs to be between 1 hot and neutral or you just have to divide the watt value by 2
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