Energy meter comparison: Shelly 3EM versus Zamel MEW-01 - opinions, experiences, accuracy

Question

My house is going to be SMART. So far I have Shelly 2.5, shelly dimmer for lights, and floor valve control. Heat pump connected and running, PV panels to be commissioned soon. I want to install 3 meters to know what is going on: at the input from the city, at the PC supply, and before the PV...

DarekLipi · Answer

Digging up the topic.

I am also facing the choice of sub meter for pv and have the same dilemma.
Apparently zamel doesn't balance interphase and will misrepresent the meter from pge..., as for Shelly I haven't dug up any such information.

Does anyone have any experience with smart sub meters and can recommend something?

marcingebus · Answer

I bought a Shelly and it shows the consumption for each phase separately. I have the cross-overs from the kit (I think for 100A), you can buy separately for 30A and you can also meter the 'N'. For lack of time I just use the chmyra that Shelly gives. To my eye it is Git, as I could observe if the Heat Pump on the comfort setting turns on the heaters sometimes. .

DarekLipi · Answer

Don't you have a PV installation to do a test with how the balancing behaves?
Production from pv 3f 6kwp which translates to 2 kwp each phase from production and switch on some loads larger than production e.g. 3 kw.
I wonder what Shelly would count in such a situation

chemik_16 · Answer

would also raise the subject, any opinions on these 2 ? they have been on the market for a while. One and the other currently sticking at ~530 price, like a price collusion, shelly wins slightly with me because of the dimensions. Ultimately for integration with HA.

My standard situation, PV > GROWATT (already downloading data via rs485 to HA)
PGE meter with modem in the box, theoretically the rs485 cables are hanging, but of course officially there is no chance they will share the data and I won't "hack". Just on asking if they share these readings somewhere the installer looked at me as if I was a thief ....

in addition, shelly we know what is inside
https://github.com/arendst/Tasmota/discussions/13515
ADE7880 (~90pln) + esp8266.

I haven't found the MEW anywhere, has anyone looked ?

I also add to the stake
Chint DTSU666
SDM630

xury · Answer

I have and use the MEW-01, with no cloud only MQTT.
You only need one for measurement if you extract PV production data by other means.
I use Sofar logger data via nodered.
From the time of installation to now I have production of over 3 MWh and consumption of over 1.2 MWh the data with the PGE meter agrees to the nearest 0.1kWh - more accuracy I can't get from the PGE meter.
Of course I am using the newer version of fw MEW-01 with interphase balancing.
I do not know if Shelly3EM also has balancing.

chemik_16 · Answer

To be honest, the SDM630 looks the most attractive to me at the moment.
Cheaper, no transformers, with a display. I haven't encountered any complaints about the measurements. And it meets some standards, unlike the others.
Adding esp in some 1din and reading the modbus is no problem.

kood · Answer

I have MEW-01 hooked up to HA after the Supli cloud.
The readings with the Tauron meter agree, the only exception is when there is no internet then the cloud doesn't count the data and there are discrepancies, internet failures are rare for me and I haven't had time to convert to MQTT.

The logger I made on ESP8266 + ESPHome reads from the inverter over RS485. This is what it looks like:

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xury · Answer

kood do you have your own logger and the one for the cloud e.g. LSW-3 ? Or just your own? I'm asking because more for fun I want to make my own, and I don't know if this won't get cluttered with frequent debugging.

kood · Answer

My own and the one from the cloud, they work without any interference. The one from the cloud has a too low polling frequency, the one on ESPHome I have set to polling every 10 seconds and it has been working smoothly since May.

xury · Answer

And I'm there debugging this LSW-3 every 2 seconds via NodeRed thanks to a flow from a colleague starob . And it seems colleague michalux has written to him integrating with HA.

kood · Answer

The LSW-3 is connected to the wifi all the time and has up-to-date data? Because at my place, as far as I remember, it connected, sent data to the cloud and kind of switched off because of that, I did it on ESPHome, the cost in total not big only problem I had with the RS485 to TTL converter because probably the third one just started working. And a lot of information can be extracted from the inverter and used for automation

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xury · Answer

. Yes because I'm the one who tells it to provide data over the LAN every two seconds. The cloud there is querying it every five minutes or so. And it's exactly the data you have. You can't just override it. And over RS485 you can. . And here is more or less the flow from NR: .

chemik_16 · Answer

and going back, I took this zamela lite because with the antenna it won't go in my box. So at first glance it's the only one with vector counting. By the way I will see where it stands .

bratmat1 · Answer

Will this Zamel Lite work with HA over MQTT without problems?

xury · Answer

It works with HA without problems.

Energy meter comparison: Shelly 3EM versus Zamel MEW-01 - opinions, experiences, accuracy

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