Hello all, I’ve been looking all over the forums for information regarding the project here and one thing that’s still confusing me is whether the emonTx shield requires and actual arduino or if it can work on its own (with emonBase or emonPi). I’m trying to monitor a 3 phase system and require (a…

[image] pb66: Are they all powered by and measuring the current of the same phase? looking at you previous power factors it looks like you maybe powering or measuring accross phases. same phase for AC-AC readings, CT are on their own phase tho… [image] pb66: ??? I’m unaware of any issues…

[image] fabiopbx: same phase for AC-AC readings, CT are on their own phase tho… I’m still not sure here, are you saying all 3 emonTx’s currently have thier AC:AC adapters connected to the same phase but the CT’s are on the separate 3 phases? That would most likely make more sense of understan…

here is latest readings [image] [image] pb66: I’m still not sure here, are you saying all 3 emonTx’s currently have thier AC:AC adapters connected to the same phase but the CT’s are on the separate 3 phases? That would most likely make more sense of understanding the power factors. yes thi…

[image] fabiopbx: yes this is currently the case, just testing they all actually worked of course… and still waiting on the installation of the separate socket phases. But if you put all the CT’s on the same phase as the AC:AC adapters you could compare them, side by side and confirm they are…

[image] pb66: But if you put all the CT’s on the same phase as the AC:AC adapters you could compare them, side by side and confirm they are all working “similarly” rather than “just working” but potentially very different. very true :smiley: ON MY WAY! lol

ermm… so CT2 is negative cause its flipped if im not wrong but has a similar PF if we dont count the negative value… CT3 i have no idea… :open_mouth: EDIT: ohh wait that has no Amp reading… ish [image] EDIT2 - same AC-AC phase, all CTs into same phase [image]

[image] fabiopbx: same AC-AC phase, all CTs into same phase That looks much better power factor wise, but the other values are very inconsistent so it’s difficult to compare, do you have a steady load you can monitor with the 3 CT’s or can you use emonhub or similar so that all 3 nodes result…

Steady load i dont think i have anything lying around tbh… those are live feeds from the serial output, they should be very simultaneous accounting for my fast screen /dev/ttyUSBX copy paste skills :smile: but from emonhub i can paste too: [image]

[image] fabiopbx: those are live feeds from the serial output, they should be very simultaneous accounting for my fast screen /dev/ttyUSBX copy paste skills :smile: but from emonhub i can paste too: not to worry, The fact they are all running on 10sec intervals and not synced will result in…

would sync be a good idea? and how would that be accomplished if so?

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Does the emonTx Shield need an actual Arduino?

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