#Recommendations for energy meters to monitor my home consumption

1 messages · Page 1 of 1 (latest)

idle lichen
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I'm looking for a single phase, 220-240V, upto 30A energy meter to monitor my home's consumption. I have a connection after meter and circuit breakers where I can put it in-line, so no clamp needed and looking for a self-powered devices that offers a HA integration (I'm a HA noob so want it easy for now). Bonus would also be Google Home integration. I live in Spain, so something that can be found on amazon.es would be another bonus.

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Shelly EM maybe? 120A per channel. Has two channels for measurement (which I don't need, but you nevber know).

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Oh wait. Amazon says 120A, device image says 2A !!!
2A is nothing, and description talks about heavy usage electrodomestic devices 🤔

stable heath
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i never found a use for the switchable output myself but i can imagine using it for a light or something

idle lichen
stable heath
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the clamps are wired to the p1 and p2 connections

idle lichen
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Just has one set of input terminals and two sets of output terminals

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internally?

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(noob to all of this - sorry for dumb questions)

stable heath
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p1+ p1- is for ct clamp 1
p2+ p2- is for ct clamp 2
L is for live
N is for neutral
O is for low power switchable output from a relay

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the Shelly EM Gen3 is a newer version of the same device with a slightly different feature set

idle lichen
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only 16A though

stable heath
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you do NOT want to run your entire household supply through a relay device

idle lichen
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I only have 14A contracted...

stable heath
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you will use some inductive loads in your house which will cause chaos with relays and cause them to arc and be a fire hazzard

idle lichen
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ok. to clamp measurement recommended...

stable heath
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yes, clamp measurement is the correct solution

idle lichen
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so, for that first device L+N is to power the device, and then I need to buy clamps to connect to P1 and/or P2?

stable heath
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they usually come with some clamps but buying from amazon means it could be any random SKU

idle lichen
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yeh, don't see clamps included.

stable heath
idle lichen
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I don't get this text from the article you linked:

"Shelly EM can automatically turn off the whole circuit if consumption or energy (prepaid energy option) reaches the set limit."

How can it turn it off, if not a relay in series with my supply?

stable heath
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newer version, comes with a 50A clamp

stable heath
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dont trust anything amazon listings say

idle lichen
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that's from the shelly page you linked

stable heath
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that probably means its switchable low power outptut

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it definetly cant switch a circuit its monitoring

idle lichen
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What is "Contactor control"?

stable heath
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oh right i see, so a contactor is basically kinda like a relay but can deal with alot more power etc...

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so if you have a contactor inline you can activate it with the low power output

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it works differently to a relay but it does the same sort of job

idle lichen
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that's what the O is for?

stable heath
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O - Output

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i guess you can set it for contactor control or you could use it for something else

idle lichen
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OK. I just want a cheap, HA compatible energy monitor - but this seems OK.
Amazon SKU seems to include the clamp as per shelly site

stable heath
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the shelly site ships to spain and potentially more reliable buying option

idle lichen
stable heath
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but yeah i imagine they probably used a SKU that has at least 1 clamp otherwise people would end up retrning

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either the normal EM or the EM gen3 will do the monitoring job you want. then just dont worry about the output

idle lichen
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You have used the Shelly HA integration?

stable heath
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all the time

idle lichen
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great. thanks for all your help and patience

stable heath
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no worries. shelly stuff is great. and i highly recomend it

terse lichen
# idle lichen maps to this I think: https://amzn.eu/d/iUCwPRI

I'm Spanish and I use exactly that device. Easy to install. It has the possibility to add a second clamp, you can buy the pricey one or tinker a little because you need to find the special connectors. Besides that, it can work as a Bluetooth proxy and a contactor controller (I think). I don't use any of that features. If you are not in a hurry, I bought it for 40 euros 2 months ago. Nice buy and nice device 🙂

stable heath
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yeah the gen3 has the advantage of having the bluetooth proxy but has the reqirement of using ct clamps with the right connector so its pro/con

terse lichen
terse lichen
idle lichen
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I have the EM3 device (amazon delivered in about 4H or less, a first!) powered, and the clamp on a cable, and setup in the shelly app.
Although the cable is supplying power to this computer (and the power supply supplying it shows output of 130W), app shows 0W usage.
Is there some additional config I need to do?

stable heath
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if its clamped over both sides then it should indeed read zero because the legs will cancel each other out.

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also FYI: you don't need to use the shelly app. when a shelly device is first powered on it broadcasts a wifi AP which you can connect to and then access the devices webui at 192.168.33.1 which you can then then use to configure it to your network settings. I never use the shelly app. just the webui and home assistant.

idle lichen
idle lichen
idle lichen
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Although I see that in Google home, only the output switch is available, no power metering 🙁