I know, the handbook states the accuracy of the EM is 1%. Whatever that means.
Given the maximum current is 50A or 120A, the maximum wattage is 220V x 50A = 11.0kW, or x 120A = 26.4kW.
But what does this mean for small wattages?
Do I always have an absolute precision of 11kW x 1% = 110W, for the 50A solution? 
What about measuring small values like 10-50W? How precise is the Shelly EM then?
Did somebody compare Shelly EM with Shelly 1 or 1PM, for such small values?
Thank you! 
Hi ploneric, I have the same question, but for both shelly EM and 3EM. I have asked official support and my questions and the answer are bellow:
Dear Shelly team,
Thank you for your support. Just few more questions I have 
:
-is Shelly 3EM working with 50 A clamps?
-what is the minimum current when Shelly 3 EM starts to measure accurately?
-what is the minimum current when Shelly EM starts to measure accurately?
-is minimum current and accuracy dependable of which clamp is used, 50 or 120 A?
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Shelly 3EM cannot work with 50A.
24.57kW is the max limit , which device can measure per phase and total.
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If you find some more information please share it with me.
Best regards.
24.57kW is the max limit , which device can measure per phase and total.
This answer is really thrilling: If I have maximum consumption (24,57kW) on one phase, the other phases should have zero consumption. Otherwise my energy metering will be not correct! What a shame…
Hi,
any findings on this topic?
I just got a shelly-EM and was testing it using a wall plug before installing it in the main circuit but the measurement always comes as 0W, given that I am measuring shelly EM self consumption I guess it falls under the precision...
