Wifi current clamp meter

[Cyberfruits]

Hi
Has anybody used these Wifi energy metering monitoring clamps before? How accurate are they? Are they easy to install? I like to monitor the power consumption of my heat pump.
Thanks

 

[TonyT]

I use a Shelly version, for power and  another for flow/return/outside air 

nonissues 2+ years in

[Cyberfruits]

1 hour ago, TonyT said:

I use a Shelly version, for power and  another for flow/return/outside air 

nonissues 2+ years in

Similar clamp system i believe, Do you find it accurate enough?

[SteamyTea]

As it is a current clamp and your heap pump is an induction load, it will not be that accurate.

[sharpener]

2 hours ago, SteamyTea said:

As it is a current clamp and your heap pump is an induction load, it will not be that accurate.

 

Good point. If it is an inverter drive then who knows what the waveform and power factor will be like?

 

OP would be well advised to check that the proposed device measures true rms power not just infer it from the current, the spec here does not say. Fortunately it appears to have an AC voltage connection so at least there is that possibility.

 

 

Edited February 19, 2024 by sharpener

[Alan Ambrose]

The fact that neither Corui nor Shelley specify accuracy suggests they are not that accurate. Suggest better than 5%? But given that we're often interested in the trend or difference rather than the absolute value it may not matter too much.

[TonyT]

https://shellystore.co.uk/product/shelly-pro-em-50a/
 

accuracy info

if it worries you that much fit an old school meter.

 

[SteamyTea]

15 hours ago, TonyT said:

if it worries you that much fit an old school meter.

Or make one, it has WiFi.

 

 

[TonyT]

Making anything like that is to much of a faff, when you can buy something out the box and install

 

dont get me wrong ideal tinkering project, but I don’t want the home brew look on my installs

[MortarThePoint]

Does it really need to be WiFi or do you just want to be able to check. If the later, my ASHP installation came with one of these:

https://www.amazon.co.uk/gp/product/B08X6J865C/

 

Alternatively, I would love someone braver than me to try out one of these:

https://www.aliexpress.com/item/1005004158545611.html

 

https://www.aliexpress.us/item/1005005184859497.html

 

Important to not that the first one says in its text that: "Both models have NO overcurrent protection, can not set current ,voltage in APP." The second offers current limiting, but that looks to be via software so not to be relied upon I'd say. Anyway, you need RCBO rather than just MCB function nowadays. Easy to put downstream of an RCBO. Both claim to be CE marked. Form you own risk assessment 🙂

 

Available as Zigbee too.

Edited February 20, 2024 by MortarThePoint

[Alan Ambrose]

 

How to identify a Conformité Européenne mark vs a China Export mark

 

https://starfishmedical.com/blog/conformite-europeenne-mark-vs-a-china-export-mar

 

[MortarThePoint]

17 minutes ago, Alan Ambrose said:

 

How to identify a Conformité Européenne mark vs a China Export mark

 

https://starfishmedical.com/blog/conformite-europeenne-mark-vs-a-china-export-mar

 

 

A fair point, but it is the CE mark not China Export one and they even include their certificate:

[dpmiller]

I'm running our ASHP off one of the Tuya MCBs and it reports nicely to SmartLife. Seems as accurate as the cheapo din-rail meter it replaced, and runs cooler too.

[embra]

Hi folks, I'm looking for something similar to OP so that I can monitor live power consumption for my Vaillant ASHP - can you share any specific devices you are using?

 

I want something that I can integrate with Home Assistant. I've already got the MyVaillant app, and my system integrated with Home Assistant. I have the energy consumption data pulling through no problem, but I believe this to be fairly inaccurate since it updates in 1kWh chunks that seem to lag actual usage at a random interval. I'd therefore like to have visibility on live power consumption, which can help to understand the overall dynamics of power distribution in my home.

[JohnMo]

11 minutes ago, embra said:

I'm looking for something similar to OP so that I can monitor live power consumption

A shelly devise which has power monitoring?

[Dave Jones]

im using a Neuro wifi CT clamp for the Tesla Powerwall, its what they recommend. Not cheap though.

 

https://service.tesla.com/docs/Public/Energy/Powerwall/Powerwall-2-Backup-Gateway-2-Installation-Manual-NA-EN/GUID-993C3C77-5D23-4ACE-BF2C-2DB739D136DF.html

 

[JohnMo]

Link not working?

[PhilT]

36 minutes ago, Dave Jones said:

im using a Neuro wifi CT clamp for the Tesla Powerwall, its what they recommend. Not cheap though.

 

As someone already pointed out earlier in this thread, a heat pump is an inductive load, for which CT clamps give the wrong power computation. You have to connect a dedicated power meter, or switch everything off except the heat pump and monitor the mains meter for as long as required.