Shelly EM for monitoring heat pump

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kelly42

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#295843 28-Apr-2022 09:27

Is anyone in NZ using a Shelly EM (with clamp) for power monitoring? I want to monitor power consumption for a heat pump system due to be installed next month. I was thinking a Shelly EM at the breaker side would work well for this and I have one on order from Shelly. Unsure if this particular model has a NZ SDoC, which would stop my electrician from installing it.

What else can people recommend for monitoring the power consumption of a large device like this?

Everyone is new sometime.

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#2907807 28-Apr-2022 09:30

I note a good discussion of this in another post - curious for an update. https://www.geekzone.co.nz/forums.asp?forumid=73&topicid=289265

Everyone is new sometime.

mattenz

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#2907975 28-Apr-2022 17:02

What software are you wanting to use? If you're handy, you can jimmy something up that's not 240V powered.

https://esphome.io/components/sensor/ct_clamp.html

There's also this for the slightly less handy

https://circuitsetup.us/product/expandable-6-channel-esp32-energy-meter/

dasimpsonsrule

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#2908007 28-Apr-2022 18:35

I use shelly 1PMs running Tasmota to monitor mine. Here is an example from this morning once it's been through MQTT then InfluxDB then Grafana:

The 1PMs have NZ compliance as far as I know

fe31nz

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#2908060 28-Apr-2022 22:29

What sort of heat pump do you want to monitor? Our newest heat pump, a Panasonic CS-Z21RKR, reports its own power usage on its WiFi interface.

kelly42

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#2908195 29-Apr-2022 10:39

Good questions all!

I am running Home Assistant. I have only dabbled in power monitoring by using some Athom wifi smart plugs (which run on ESPHome and are great) and I've got a stack of Shelly 1PMs ready for my kitchen equipment when it gets installed soon.

The incoming heat pump is a 14 kW Panasonic ducted system, with an internal unit S-140PE1R5, external unit U-140PE1R5, and their wifi + Bluetooth controller CZ-RTC6BLW. Happy to consider another controller if that is better for automation purposes. There is an ESPHome-based wifi unit under development for local control, as I have read that the Panasonic cloud control is terrible. If I can get power usage data from this setup then that's great, but I figured it would be more robust to wire in a Shelly (1PM or EM).

Although I regularly tinker with Shellys, I'm not interested in wiring something myself - swapping in the ESPHome-based wifi will be about the limit for me.

Everyone is new sometime.

mattenz

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#2909172 2-May-2022 09:21

I have no direct experience, but the Intesis untis look good for local control of ducted systems. That ESPHome solution does look great though!

A Shelly 1PM probably won't work for power monitoring, as far as I know it's only rated to 16A.

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xbmcnut

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#2921055 31-May-2022 17:44

If you're using Home Assistant, might pay to take a look at this first? https://github.com/sockless-coding/panasonic_cc You might just be able to pick up power consumption as I can with the HACS Mitsi integration.

RS820+, DS223, CoreELEC on Odroid N2+, 3 x Echo Dot & 7 x Google Homes connected to Home Assistant on Beelink SEi12.

kelly42

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#2921057 31-May-2022 17:49

Yes, that integration is going to be my first step! I have seen many reports that the cloud component of the Panasonic Comfort Cloud is unreliable, though, so the local connection option is of interest.

It is great to see that there is an option to connect this 'out of the box'. Now if only the heat pump units would get to NZ a little faster...

Everyone is new sometime.

eluSiveNZ

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#2921083 31-May-2022 19:13

kelly42:

Yes, that integration is going to be my first step! I have seen many reports that the cloud component of the Panasonic Comfort Cloud is unreliable, though, so the local connection option is of interest.

It is great to see that there is an option to connect this 'out of the box'. Now if only the heat pump units would get to NZ a little faster...

I am using this component in my Home Assistant. Its "fairly" reliable, the main issue is that it stops working when Panasonic updates the terms and conditions of the app, you have to accept this on the mobile app before it will start working again.

I wouldn't bother with the energy data in this component, it doesn't match the app at all (in my experience)

michelangelonz

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#2921094 31-May-2022 19:34

I just received my shelly EM and am using it to monitor my whole house power use with home assistant. Works well.

kelly42

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#2921117 31-May-2022 20:15

michelangelonz: I just received my shelly EM and am using it to monitor my whole house power use with home assistant. Works well.

Envious! I received my EM too but I haven't convinced my electrician to wire it - it has no NZ SDoC :( Can you share anything about your installation process?

Are you using one clamp or two?

Everyone is new sometime.

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timmmay

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#2921121 31-May-2022 20:27

kelly42:

Good questions all!

I am running Home Assistant. I have only dabbled in power monitoring by using some Athom wifi smart plugs (which run on ESPHome and are great) and I've got a stack of Shelly 1PMs ready for my kitchen equipment when it gets installed soon.

The incoming heat pump is a 14 kW Panasonic ducted system, with an internal unit S-140PE1R5, external unit U-140PE1R5, and their wifi + Bluetooth controller CZ-RTC6BLW. Happy to consider another controller if that is better for automation purposes. There is an ESPHome-based wifi unit under development for local control, as I have read that the Panasonic cloud control is terrible. If I can get power usage data from this setup then that's great, but I figured it would be more robust to wire in a Shelly (1PM or EM).

Although I regularly tinker with Shellys, I'm not interested in wiring something myself - swapping in the ESPHome-based wifi will be about the limit for me.

I had a Panasonic ducted heat pump for a few months, until I had it removed because it was so loud. The power usage features were good, but the unit itself was not. More here. Friends have the Panasonic ducted units and are happy enough with them though.

Where did you get your Athom smart plugs that do metering and are HA compatible? I use Kasa plugs but you can't get them any more, and the replacement TP-Link ones I don't think automate as well.

michelangelonz

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#2921126 31-May-2022 20:58

kelly42:

michelangelonz: I just received my shelly EM and am using it to monitor my whole house power use with home assistant. Works well.

Envious! I received my EM too but I haven't convinced my electrician to wire it - it has no NZ SDoC :( Can you share anything about your installation process?

Are you using one clamp or two?

I guess its a case of who you know...Im using one clamp on the main and hot water cables. I have just ordered another clamp to separate the two as the hotwater is a controlled supply that has a different tariff. Ill just then use HA to sum the two together to get whole hose power useage (Watts) and separate for energy (kWhs) and cost.

I sure its just a matter of time before the EM has a NZ SoDC.

Cheers.

Nate001

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#2921129 31-May-2022 21:11

Whats the legality of wiring a device like this similar to an appliance? ie by attaching it with a standard power cord into a wall socket? You can still measure the desired circuits without altering the wiring as its a clamp.

michelangelonz

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#2921130 31-May-2022 21:17

SDoCs still apply to plug-in equipment. Have a look at the links below.

http://onesecurity.co.nz/shellyem/ and

https://www.worksafe.govt.nz/topic-and-industry/electricity/appliances-and-fittings/core-requirements/international-electrical-mras/ from

https://www.geekzone.co.nz/forums.asp?forumid=73&topicid=289265

Might help.

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