this post was submitted on 23 May 2025
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Energy usage clamp meters (feddit.uk)
submitted 1 day ago by [email protected] to c/[email protected]
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As I'm currently doing a re-wire, it's a great opportunity for me to put some metering in the house.
I'm single-phase, but I plan to monitor multiple sections of the house, which are each wired for 100A independently.

I'm currently eyeing up either the Shelly Pro 3EM – 120A or the 50A.
As it will fit nicely in the consumer unit, and supports Ethernet.

I previously looked at the Aeotec clamp devices, but they seem to be difficult to find with multiple 100A connectors.

Emporia Vue was also a consideration, but I'm always a little hesitant to buy products that require custom firmware to even work properly, when others are available. And I'd also like to avoid using 2.4Ghz wifi for connectivity.

I'd love to hear any experiences people have had with similar devices, good or bad. And how the integration with HA went.

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[–] [email protected] 6 points 23 hours ago (1 children)

I have the Shelly Pro 3EM 120A and I have nothing but good things to say about it, installation is easy if you know what you're doing, integration with HA was trivial and it's very customizable. Before purchasing it I was worried about the update frequency of the values, but I was happy to see that it updates about a couple times per second, which is great. I'm happy to answer any questions you might have!

[–] [email protected] 2 points 22 hours ago (1 children)

Ah, brilliant. In that case, I may have the confirmation to make the order.

It's just a shame the 120A is so much more expensive! £70 vs £120.
As there is a low chance I'll be pulling more than 50A on a circuit, but I know it'll 100% happen one day if I cheap out!

[–] [email protected] 1 points 21 hours ago (2 children)

Yeah the bigger toroids are quite expensive, you can always buy just the toroids by themselves later on though, I think Shelly even sells them separately

[–] [email protected] 2 points 20 hours ago (1 children)

Second question actually; How did you find the installation?
I'll probably get an electrician to fit, but if there are any gotchas it'd be good to know before I instruct.

[–] [email protected] 1 points 19 hours ago

My dad is an electrician so he did it for me, from what he told me it was pretty straightforward. The easiest thing to mess up is the orientation of the toroids, which is easy to notice because the values will be negative. The 120A toroids are also kinda bulky, if your panel is on the small side it might be a bit difficult getting them in there.

[–] [email protected] 1 points 21 hours ago (1 children)

They only seem to sell the 50s separately, which is a shame. £50 worth of calibrated iron, hooray (!).