Shelly for energy monitoring of heating and circulating pump

[ynnus]

 

Hi Shelly community,

I want to measure the power of my home heating control system (which is an old oil heating in my basement) for energy monitoring, especially the circulating pumps. I have one shelly plus 1 for the main power supply for the complete heating control system to be able to switch it off and on from remote.

Also I have 2 circulation pumps, one for the heating and one for hot water. Both pumps are directly plugged into the heating control unit and only are powered when needed. So there is no voltage when heathing is not active. I have a shelly 1pm mini gen3 attached to each pump right now. But since the pumps are only provided with voltage when needed the shellys are also off most of the time and only boot up when the heating is providing electricity. So I thought it would be better to have the shellys always active but the output only on if the heating control unit provides power. Is there a way to wire them according to my needs? I need to measure the power, so I guess I can only use a shelly 1pm (plus or gen 3). Can I wire the heating control system to the SW input in order to switch the output on and off? How do I wire it properly?

The pumps do have the regular 3 wires for phase conductor, neutral wire and ground wire.

 

EDIT: I was thinking about wiring it up like shown in the attached image. So the shelly gets L and N not from the heating control system but are allways powered while the heating control system is only used for switching the SW input of the shelly. In the shelly app I would configure input SW to switch the output, so the heating control system would switch the input on so the shelly switches the output to the pump on. Is this a proper way to do it or will it destroy the Shelly?

 

Thanks for your help,

Stefan

Edited September 19 by ynnus

[thgoebel]

This way:

[ynnus]

@thgoebel Thanks, I will try this.

[Dreckfresse]

9 hours ago, ynnus said:

complete heating control system to be able to switch it off and on from remote

Is this allowed with an old oil heating system?

It would also be too unsafe for me if the Shelly broke down and my family had to freeze, just a comment (please)

 

I monitor my heating system with a Shelly EM (nowadays it also works well with one or two Shelly mini PM) => no relay

One clamp monitors a circulation pump and the other monitors the rest of the system

A Plus 1 is installed on the circulation pump (as described above) so the heating boiler could continue to switch. if this Shelly were to fail, it would just take longer for hot water to come out of the pipe. However, this Shelly is detached in the SW settings, so that my higher-level system takes over control (would also work with the Shelly app).

[ynnus]

On 20.9.2024 at 08:29, Dreckfresse said:

Is this allowed with an old oil heating system?

It would also be too unsafe for me if the Shelly broke down and my family had to freeze, just a comment (please)

 

I monitor my heating system with a Shelly EM (nowadays it also works well with one or two Shelly mini PM) => no relay

One clamp monitors a circulation pump and the other monitors the rest of the system

A Plus 1 is installed on the circulation pump (as described above) so the heating boiler could continue to switch. if this Shelly were to fail, it would just take longer for hot water to come out of the pipe. However, this Shelly is detached in the SW settings, so that my higher-level system takes over control (would also work with the Shelly app).

Why should'n it be allowed? There is even a requirement for an emergency off button for my heating so now I even have one which I can trigger from my phone. Though I do not really plan on switching off the whole heating using the shelly right now. There is not really a need, except in case of vacation in summer when neither warm water nor heating is required. But in this rare case I could do it manually on the heating controller itself.

I also tried a Shelly pm mini gen3 on both the circulating pump for heating and warm water to measure the power. But since both are directly powered by the heating controller this has 2 downsides. First - the Shellys are powered off when the pump is not active. So they need to boot up every time and when offline they don't provide data. Secondly the heating controller power consumption would result in a combined power consumption of controller and both pumps because both shellys are plugged directly to the heating controller. So the solution to use the shelly plus 2pm for measuring and providing power separately is better because I only use the power from the heating controller to switch the relay, so there is no real power consumption and the Shelly is always on for better controlling and measuring. So now I have a Shelly plus 1pm to measure the heating controller itself and a Shelly plus 2pm for measuring power consumption of both pumps individually. Works perfectly fine.

I will attach a Shelly addon soon to get temperature and humidity values as well.

[wooly]

I do not understand your affirmation

Quote

So the solution to use the shelly plus 2pm for measuring and providing power separately is better because I only use the power from the heating controller to switch the relay, so there is no real power consumption