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Real world connection to a heat pump over modbus

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 ctw
(@ctw)
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@cathoderay thanks - I won't hold out too much hope on the FHP option then.


   
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(@mosibi)
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Posted by: @ctw
  1. Is there any guidance out there on how to actually wire up the Midea controller? I did find this YouTube video which appears to show how to do this - is someone able to confirm this is correct, and not somethign specific to Homely?
  2. I've done some searching through all the documentation I have to hand, but don't appear to have anything that contains the modbus register, which I’ve seen referenced. Does anyone know where there is a copy of this online.

On my GitHub page you will find info about the connection and modbus registers.

https://github.com/Mosibi/Midea-heat-pump-ESPHome

 


   
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cathodeRay
(@cathoderay)
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@mosibi - thanks for your contribution, looks like an interesting project! However, it does tie the user to using your hardware, ESPHome and Home Assistant, and not everyone (I for one) wants to be tied to Home Assistant.

I note that you have most if not all of the modbus register addresses in your heatpump.yaml file, starting at line 319. 

For historical reasons, I do have HA installed (the historical reason being I started out intending to use HA, and then decided otherwise) and by having HA installed, I also have a small Linux OS on the mini computer which I use to run the python scripts that do my monitoring and DIY auto-adaption control. The physical connection is a wired connection that has a RS485 to USB adadapter at the mini computer end, and the viewing of data and management of the mini PC is done from my main desktop computer over a wired local network.      

Midea 14kW (for now...) ASHP heating both building and DHW


   
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(@mosibi)
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Posted by: @cathoderay

@mosibi - thanks for your contribution, looks like an interesting project! However, it does tie the user to using your hardware, ESPHome and Home Assistant, and not everyone (I for one) wants to be tied to Home Assistant.

I note that you have most if not all of the modbus register addresses in your heatpump.yaml file, starting at line 319. 

The project self is indeed ESPhome based, but how you connect a modbus interface or information about the modbus registers is of course generic, hopefully @ctw is being helped with this.

Posted by: @cathoderay

For historical reasons, I do have HA installed (the historical reason being I started out intending to use HA, and then decided otherwise) and by having HA installed, I also have a small Linux OS on the mini computer which I use to run the python scripts that do my monitoring and DIY auto-adaption control. The physical connection is a wired connection that has a RS485 to USB adadapter at the mini computer end, and the viewing of data and management of the mini PC is done from my main desktop computer over a wired local network.      

That’s a nice setup and gives you, as a tinker, all the control you need and want. Not all people have the knowledge or energy to handle such a setup, but still want the same level of insight and control. For those people a less DIY solution using an ESPhome solution, together with Home Assistant, would fit better.

 


   
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