#Is my scheme correct ?

1 messages · Page 1 of 1 (latest)

open bramble
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Hello !

I'm not sure to ask in the righ channel, if not tell me where I should post and I will do 🙂

I'm currently planning to remove my full Netatmo hardware, I'm not satisfied with their devices and look for more customizable ones.

I decided to move to Shelly which seems to be the best choice for the whole house integrations. But unfortunately they do not have a device for electric radiators.

After reading the specs of 1PM and 2PM devices I made this scheme. My goal is to :

  • Read the consumption of each radiator
  • Being able to pilot the radiator (on/off/eco/frost-free) using a diode module for pilot wire
  • Pilot the radiator from the right spot in the room using a Shelly H&T

I need to cover several houses, I already have a 2.4Ghz wifi mesh which cover properly each buildings and the whole land (two hectares).

Before connecting all this stuff I would like to know if you see something wrong or I missed. I would love to not burn my shelly nor the diode module.

You can find the diode module here : https://gce-electronics.com/fr/electronique-oem/314-module-diode-fil-pilote-.html

Once done I will pilot my solar panels with Shelly hardware too 🙂

Capture_decran_2025-07-29_a_18.14.04.png
unborn iris
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What Shelly device doesn't support electric radiators? It's just a big resistor

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Unless you mean it exceeds the power rating

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I got mine on a basic plug

open bramble
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I say that in the sense that they do not provide a device that does everything I need to do (consumption and pilot wire control)

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That's why I have to use both 1PM and 2PM devices for one radiator

pine charm
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Does the radiator really have 3 connections? If so, why the diode?

As for the Shelly's, the 1PM does not have a L1 terminal, it has an O(utput) terminal. On the 2PM they are O1 and O2 (with the O from output) as well.

As for wifi, please tell me you have ethernet cables between the access points? Wireless mess just sucks as it just pollutes the airwaves.

open bramble
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The radiator have N / L and pilot wire. The diode is to send the right signal to the pilot wire to change the radiator mode based on usage of the room. So the combined output from 2PM will let the diode send the right signal to perform the wanted action.

Concerning the 1PM L1, so I have to use the O instead and just keep it enabled ? I'll update the schema to reflect this change.

Yes my access points are connected to each others using RJ45, using wireless connection between them reduce too much the data speed.

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I should receive my 1PM and 2PM tonight or tomorrow, i will finally be able to test my setup 🙂

pine charm
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But what is that "pilot wire"? What kind of radiator? Might be that I'm not familiar with it but it seems a bit weird.

About the 1PM, it has no L1 so no idea what you wanted to use. But if you want to measure consuption you will need to use the O(utput) terminal. But if you don't need to switch it a Shelly PM Mini Gen3 would have been a perfect choice.

open bramble
# pine charm But what is that "pilot wire"? What kind of radiator? Might be that I'm not fami...

Here is an explanation abour pilot wire, they explain it better than me 🙂
https://support.enki-home.com/hc/en-us/articles/17047252217874-Using-a-radiator-with-a-pilot-wire

Yep the 1PM is to measure the consumption and the 2PM to pilot the mode using the diode.

I never heard about Shelly PM Mini before, it does measurement without the on/off feature ? In fact I don't need the switch on the 1PM, I just need the measure 🙂

pine charm
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It's still not explaining it... It only talks about modes and a module... What do you apply to it and why? And what does it look like? 😄

Yeah, PM Mini has no switch. And it's almost a bit silly that Shelly has no Shelly 2 (aka, without power metering).

open bramble
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It's still not explaining it... It only talks about modes and a module... What do you apply to it and why? And what does it look like? 😄
My radiators are near doors, they always think the room is cold while not, the main goal is to manage their usage with temp detected from Shelly H&T module. So instead of having 3 radiators with 3 behaviors, I will have a centralized command. I'm going to do that for all rooms, my house is not well insulated so it will allow me to consume less electricity. I'm currently replacing my whole Netatmo setup (cameras, outlets, contactors etc etc...). Netatmo sucks.

Yeah, PM Mini has no switch. And it's almost a bit silly that Shelly has no Shelly 2 (aka, without power metering).
I agree, it would be really cool. They should also make this kind of device : https://www.legrand.fr/pro/catalogue/sortie-de-cable-connectee-celiane-with-netatmo-compatible-fil-pilote-3000w-on-off-et-mesure-consommation-blanc

pine charm
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Your still taking about what can be done or what you want etc. But I'm looking for info on the radiator 😄 Manual, datasheet etc. How does that thing work.

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I mean, your goal is clear, take control. But I've never seen a radiator with a "pilot wire" so I don't have a clue how it works 😄

open bramble
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The pilot is managed with 230v signal which is specific. Here is the standard

IMG_3197.png
unborn iris
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what are O1 and O2?

open bramble
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O1 and O2 are from the Shelly, the parts you want is signal FP.

Each signal enable a specific mode. I can show you the setup once done this weekend.

unborn iris
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it's really complicated for only setting a mode

open bramble
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  • Confort is the temp you choose
  • Eco is the temp you choose minus 3°C
  • HG is 10°C
  • OFF is shutdown

I think they used this way because houses are supposed to provide pilot wire through the home to the electric panel and then have one module to control all of them from a centralized way. In fact only new houses may have this feature which is not mandatory.

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We love complicated stuff there 😂

unborn iris
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it's an electric radiator, so incredibly inefficient

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you have cheap electricity?

pine charm
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If it's common it's only common in France😅 Your table has an error (double on-on) and weird choice to have to send a signal for off but I get the idea.

Then yes, you could do that indeed with a 2PM and a double diode.

And yeah, not efficient but I know it's common in France. Probably because the large amount of nuclear power build in the 70.

open bramble
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Yep, nuclear help a lot, I'm moving to off grid system step by step 🙂
It's hard in france due to the massive amount of required authorizations :/