New PZEM004V3 MPP

[sergey]

Hi everyone!  Under Mike's endorsement want to share with you one of my last project - PZEMV3 MPP. TO be honest I had the PZEM +MPP for a long time, several of them was working in my country house , one was installed in city's home, but after long "academic" discussion with Mike and inspired by his advises I decided to rewrite the software completely.  All the PZEM's libraries circulating in the internet works badly with serial, that left a few resources for working with net and answering for AM server query. So the version I share, has been build without libraries . It can read electric power figures up to 5 times per second , that is quite fast, and reporting all values to AM server.

More over the device works in "non-invasive" manner , that significantly broadening the range of it measurement (0-100A, 80-250V) .

All the details in the file header.

Again, thanks Mike for technical inspiration and advices.

Links to github project PZEMV3MPP

[st...@marshallarts.com.au]

Nice work Sergei, this is of considerable interest to me.  I am in the process of removing all gas appliances from my house and going all-electric, so I am keen to be able to see what is consuming what!  I had a look at the Github project, and your wiring diagram seems to indicate that the current transformer clamp goes around both the Active and the Neutral conductors in the line being monitored - is that right?  My understanding was that the CTs go around the Active conductor only.  I'd love to be wrong - it would make wiring a lot easier. I have actually bought a few Shelly EM devices which I will install on the highest-power appliances - these Shelly monitors have a public local API, which is quite rare as far as I have looked.  But there will be other places where I'd like to monitor consumption and the Shelly gadgets are quite expensive, so your work is looking good.  Thanks for sharing.

[sergey]

Hi Steve, sorry for late reply - was on "digital detox" - outside of the Polar Circle in tundra , out of any cellular coverage. :)
Yep , you are right the image is wrong , perhaps I borrowed it from internet field somewhere ...
The clamp is only for "Load" wire , not for "Neutral".  Yeah - I saw the Shelly and have to say - all they devices quite nice at technical side but they are expensive and often bad manufactured.
Because I planned to spread the power control quite wide across my electrical network, the cost was important for me and definitely "non-invasiveness"  .
I'm glad that my work turned out to be in demand, feel free to ask if any!

[st...@marshallarts.com.au]

No apology necessary, sounds cold!  Today is winter solstice here in Australia, but nothing like where you've been!  Anyway, I have had one of my Shelly EM devices installed (in the meter box, so had to be done by a licensed person).  I'm quite impressed with it. I have one more, which will be installed when the last of the new appliances gets connected up soon.  Once that is done I will be enhancing my software that monitors my solar system, to poll the Shellys and add what is being consumed to the data that is collected/displayed.  I also bought a couple of their wifi buttons, and I'm quite impressed with them too.  Very small, and can be programmed to make a call to a user-defined URL for up to 4 actions - single press, double press, triple press, and long press.  I've only used the single press and I have them firing an event in my MppServer to toggle lights.  And their batteries are USB-rechargeable, which is quite neat. There is a delay of about 2 seconds while they wake up, but that's fine.  If left plugged into USB the response is instant.  So yes, I like the Shelly devices a lot.  Having that published local API is great, makes it feasible to keep nearly everything inside my own network (no cloud!).  But I do wish the prices were a bit lower. B-(

[sergey]

Each, ADE7953 that the Shelly Em is based quite good chip. I wander if you looked for the Sonoff ,based on the same chip?

пт, 21 июн. 2024 г., 18:10 st...@marshallarts.com.au <st...@marshallarts.com.au>:

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[st...@marshallarts.com.au]

I didn't, I wasn't aware of that.  I have only recently started looking into power measurement, so I have a lot to learn!  I guess a Sonoff could maybe be re-flashed with some Mpp software, or something I built myself, based on the Mpp system.  I will definitely look at them, thanks Sergey.