mfo906 Posted June 24 Share Posted June 24 Hey, I'm using the Plus 2PM on 24Volt to power DC motors shades. I'm doing this with a relay pole turner. Manually I can open and close them but the web interface is asking me for a calibration wich fails constantly. The power for the DC motors is delivered via the Shelly as well but I assume that in low voltage DC mode there is no current measurement? Is there a way to fix this? Why I'm caring? I'm using (HA) and there the integration of the Plus 2PM doesn't work very well. I'm only able to close the cover. The open button works only when the cover is moving. My fear is that this has to do with the calibration as I have integrated already 26 Shellys into HA. Any ideas? Thanks Manfred 1 Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted June 24 Members Share Posted June 24 (edited) Spending an extra 24V DC power supply, calibration is possible: This is achieved by routing the mains voltage through the Shelly (a Shelly plus 2PM will fit equally), thus enabling the power measurement, which is essentially for calibration. Edited June 24 by thgoebel 2 1 Quote Link to comment Share on other sites More sharing options...
mfo906 Posted June 24 Author Share Posted June 24 8 hours ago, thgoebel said: Spending an extra 24V DC power supply, calibration is possible: This is achieved by routing the mains voltage through the Shelly (a Shelly plus 2PM will fit equally), thus enabling the power measurement, which is essentially for calibration. Thanks for this! Make sense as I can run the Shelly 2* with 230V like on my other covers where it works nicely. Seems I need to rebuild my setup a bit.. Thank you Manfred 1 Quote Link to comment Share on other sites More sharing options...
Klaus57 Posted June 27 Share Posted June 27 I have connected a Plus 2PM to 24V DC with a 24V DV roller motor. I can move the motor up and down with the Shelly. However, no voltage or current is displayed on the Shelly website (as with 230V operation). This means I cannot calibrate the Shelly. Is this normal for 24V DC, or am I doing something wrong? 1 Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted June 27 Members Share Posted June 27 (edited) The energy meter IC in Shelly PM and EM series measures AC only. Thus, no calibration is available - except with another diagram like this one: The diagram shows 12V DC parts. But it’s easily to adopt for 24V DC: You‘ll need TWO power supplies for 24V DC and the relay coils have to withstand 24V DC. And yes: A Shelly plus 2PM may be used instead of a Shelly 2.5… Edited June 28 by thgoebel 1 2 Quote Link to comment Share on other sites More sharing options...
Klaus57 Posted June 27 Share Posted June 27 Thanks, I had already thought of something like that. With two 24V power supplies and two 24V relays, the effort is too high for me. I will probably look for another solution. The aim of the action is to integrate my Velux windows into the ioBroker. 1 Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted June 28 Members Share Posted June 28 Would you please inform us if you have found a better solution which allows calibration? 1 Quote Link to comment Share on other sites More sharing options...
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