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Monitor the Mains? #14

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rechena opened this issue Sep 20, 2020 · 37 comments
Closed

Monitor the Mains? #14

rechena opened this issue Sep 20, 2020 · 37 comments
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@rechena
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rechena commented Sep 20, 2020

Can I use this board code to monitor my house at the mains board? Thanks
@alcar21
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alcar21 commented Sep 20, 2020 via email •
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@alcar21 alcar21 added the help wanted Extra attention is needed label Sep 21, 2020
@rechena
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rechena commented Sep 21, 2020

Thanks for the reply. I had a old system using an arruino uno and Xbee but this makes it so much better :)
One thing though on mine I was measuring using an AC/AC transformer for the current, would it be possible to do the same somehow on yours? Thanks

@alcar21
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alcar21 commented Oct 1, 2020

Yes, you can measure AC by putting the clamp on one phase. You only need a transformer to power the ESP8266

@rechena
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rechena commented Oct 2, 2020

Thanks I was more asking about using this approach - https://learn.openenergymonitor.org/electricity-monitoring/ctac/how-to-build-an-arduino-energy-monitor. But That would need some changes on the board.
Regardless, do you have any link to help with the calculation of the icalc? Thanks

@alcar21
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alcar21 commented Oct 2, 2020 via email

@rechena
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rechena commented Oct 4, 2020

Hi, I'm a bit confused on whats happening, I finally got around to install this, ufortunately I had to install the CT on the Neutral since the Live is too short, regardless, from what I read it won't make a difference.
The concern is, looking at the house in "standby" I'm reading around 146W, which I love it being so low, but.. when I turn on my kettle which is 2500/3000W, the Watts only increase to 568W... I have a SCT-013-030 and I've calibrated the iCalc to 30.0... I've measured my Voltage with a Multimeter and its giving me 233V.

Can you think if anything I might be doing wrong?

Thanks

@alcar21
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alcar21 commented Oct 5, 2020 via email

@rechena
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rechena commented Oct 5, 2020

I would gladly but unfortunately it was so hard to had the CT to the main's board that if I remove it it will break :( need to order a new one and then I can test. I was just wondering if you noticed something similar... Guess I need to buy a new CT and test it... :(

@alcar21
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alcar21 commented Oct 5, 2020 via email

@rechena
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rechena commented Oct 5, 2020 •
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I've just tested both ways, with the socket and directly with just the hairdryer, and its reporting only ~400W for a 1800-2200W hairdryer :(

IMG_6901

@alcar21
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alcar21 commented Oct 5, 2020

Please, Can you post images of your configuration?

@rechena
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rechena commented Oct 5, 2020

Of the d1mini and all the components?

@alcar21
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alcar21 commented Oct 5, 2020 via email

@alcar21
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alcar21 commented Oct 5, 2020

image

@rechena
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rechena commented Oct 5, 2020

Sure :)
image

btw, I've measured the Voltage with a multimeter on a wall plug.

@alcar21
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alcar21 commented Oct 5, 2020

oook, CT is 0-1v or 0-5v?

@rechena
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rechena commented Oct 5, 2020

It's the SCT-013-030...so from the specs its 0-1v? I did used in the past with a 5V Arduino, not sure if it helps.

@alcar21
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alcar21 commented Oct 5, 2020

Arduino works with 5v and ADC of ESP8266 work with 1v. This board is calibrated for the ADC of the Wemos D1 to range 0-1v.

image

@rechena
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rechena commented Oct 5, 2020

That is the board I got, I got it from the eBay link you have on this page.. :( and I'm using it with a Wemos D1

@alcar21
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alcar21 commented Oct 5, 2020

It's all Ok. Can you post a photo of the connections with Wemos D1, board, and CT?

@rechena
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rechena commented Oct 5, 2020

IMG_0403
IMG_0402
IMG_0401

@rechena
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rechena commented Oct 5, 2020 •
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I might be wrong, but I find the A/Current value way to low...
Not sure if its relevant but noticed that you initialize the current twice on L51 and then some lines bellow.

WemosEM/WemosEM-Mqtt-Power-Sensor/WemosEM/WemosEM.ino

Line 51 in 8c6dffa

emon.current(A0, Ical); // Current: input pin A6=D4, calibration factor

Looking at the Emon docs https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/how-to-build-an-arduino-energy-monitor-measuring-current-only it seems that only once needed?

@alcar21
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alcar21 commented Oct 5, 2020 via email

@rechena
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rechena commented Oct 5, 2020

So you think I might have a bad CT? :(

@alcar21
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alcar21 commented Oct 5, 2020

yes, may be

@rechena
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rechena commented Oct 5, 2020

Ok so not much to do but buy a new one. Any recommendations on the Amp? Should I keep the 30amp or go higher?

@alcar21
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alcar21 commented Oct 5, 2020

I recommend to you buying PZEM-004T. I have a firmware that it's compatible with PZEM-004T.
This CT has more precession that SCT-013-30. The SCT-013 is best when it's smaller.

@rechena
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rechena commented Oct 5, 2020

Does it work with the d1mini and the shield? Do you have a link?

@rechena
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rechena commented Oct 6, 2020

Was just checking the eBay where o got the board and I think I've figure out the issue. This board is for use with the sct-013-000 so I'm guessing there's an extra burden resistor, I do recall when I was using the openenergy schematics that was the plan. I've just ordered one and will let you know.

@alcar21
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alcar21 commented Oct 6, 2020 via email

@rechena
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rechena commented Oct 6, 2020

Don't think mine is calibrated... and wouldn't want to remove an R1.. so I might just wait for the 000 one to arrive :)

@alcar21
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alcar21 commented Oct 6, 2020 via email

@rechena
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rechena commented Oct 6, 2020

Yep, will make the change which from this link: http://lechacal.com/wiki/index.php/Current_Transformer_Conditioner is 85.71... interesting number... :D

@alcar21
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alcar21 commented Oct 6, 2020 via email

@rechena
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rechena commented Oct 6, 2020

After a chat with the board seller he confirmed that my CT already had a burden resistor, so I've just removed resistor 1 and now I have proper measures :)

Standby: image

Kettle: image

@alcar21
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alcar21 commented Oct 6, 2020 via email

@rechena
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rechena commented Oct 6, 2020

Thanks for all your help. I'm gonna close the issue :)

@rechena rechena closed this as completed Oct 6, 2020
@Quercus84 Quercus84 mentioned this issue Nov 6, 2020
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