VV[quote=“bluetardis, post:27, topic:248”]
So… We had a flicker around 17:40
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Define flicker. The IoTaWatt shows an outage for ten minutes. If your lights were on during that time, IoTaWatt could not find a symmetrical AC cycle to use as reference. In any event, it logged zero (I believe on all phases, those lines are just the graph utility filling in the gap with the last known value.
So the changes to the sample routines are now picking up the problem and handling it as best it can. I don’t believe this is related to your problem of not matching the meter.
I think I’ve said before that there are a lot of different combinations of phase assignment and CT orientation. I think it’s 48. So there are 47 different erroneous combinations, and 1 correct one. If you have all of the CTs oriented the same way, that reduces the possibilities to 12. If you are certain which line has the VT, the possibilities are further reduced to 4. 3 incorrect and 1 correct. So lets take a look at that old picture of the back of your panel. I’ve marked it up with some labels that I believe are correct:
I’m not sure if this is still the way you have the CTs. The picture is from August 4. I’ve added arrows to each of the Line and Load cables that go to the fuses. Assuming an arbitrary direction of into each fuse, it goes through the fuse, then out the load cable to the meter. So the CT labels on Line A and Line B both face the board. Lets go with that. Now, looking at the CT that you have placed on Load C, the label also faces the board, yet the arrows on the load side point away from the board. So I would say that the CT in the picture on Load C is backwards. Going by the same logic, the CT on Solar is also backwards, but by convention, we usually want the solar generation to be positive, so to get a positive number when current flows backward through that line to the fuse, you should leave the CT backward as is.
Now this is going to change the measurements, exactly how I can’t say. Also, it’s possible that the phases are not correctly assigned. Thinking this through, and my head is starting to hurt because this is not my area of expertise, but remember that I said that if all of the CTs are oriented the same way, and we absolutely know which one is the VT line - phase A (by definition), then there are just four possibilities:
- The correct one.
- The inputs are assigned to the correct phases but all of the CTs are reversed.
- The inputs assigned to phase B and C are reversed and all of the CTs are correctly oriented.
- The inputs assigned to phase B and C are reversed and all of the CTs are backwards.
I’m not sure if any of our previous observations can eliminate any of these possibilities, but until that line C CT joins it’s mates with the same orientation, there are a lot more possibilities. So what needs to happen is to insure that all the CTs are oriented the same, and we’ll proceed from there.