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Daikin COP / energy used measurement from MMI

 
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Air Source Heat Pumps (ASHPs)
Last Post by squarepeg77 1 year ago
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 squarepeg77
(@squarepeg77)
Eminent Member Member
Joined: 2 years ago
Posts: 19
Topic starter 08/04/2024 8:06 pm  

@crasher sorry, I missed your message. 

I haven’t found a fix for this. I mentioned it to Octopus and a Daikin engineer when they visited and they were not very interested, stating that it was only approximate anyway. 

So I setup ESPAltherma and have had it running for 3 months with Home Assistant:

https://raomin.github.io/ESPAltherma/

It is excellent and provides great insight into what your Daikin is doing. 



   
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 squarepeg77
(@squarepeg77)
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Joined: 2 years ago
Posts: 19
Topic starter 08/04/2024 8:08 pm  

@hcas I’ve got the Daikin integration for Home Assistant; it seems to show the same (bad) electricity data as the MMI 😔 



   
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 Crasher
(@crasher)
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Joined: 2 years ago
Posts: 7
08/04/2024 8:42 pm  

@squarepeg77 Thanks for the reply. I never got an answer either but it just resolved itself, checked it a few days after posting here and all was good again I had readings back! I don't believe it to be 100% accurate but it gives a guide to how the unit performs. I've found the same with Daikin, they never seem overly interested in providing any help



   
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 HCas
(@hcas)
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Joined: 1 year ago
Posts: 111
08/04/2024 8:53 pm  

@squarepeg77 Hi! Is it your ESPAltherma that is connected to Home Assistant? Or are you using the Onecta API for the Home Assistant?
And the ESPAltherma gives you the same wrong readings as the Onecta app and MMI?

Have you set up any home automation or smart steering of your heat pump?


CEO and co-founder at HavenWise


   
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 squarepeg77
(@squarepeg77)
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Joined: 2 years ago
Posts: 19
Topic starter 08/04/2024 9:36 pm  

Both ESPAltherma and Daikin integration connect to Home Assistant. 

The Daikin integration exposes sensors that match the ONECTA app or MMI; so for me that means incorrect electricity consumption.

ESPaltherma is much lower level, but the electricity (voltage and current) sensors are considered inaccurate, so people seem to be using external monitoring. I’ve got a CT clamp around the heat pump feed that goes back to an Eddi, then I collect the data in HA. 

If you want to get going with ESPAltherma, there’s an excellent guide here:

https://community.openenergymonitor.org/t/daikin-altherma-espaltherma-home-assistant-with-openenergymonitor/25057/6



   
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 squarepeg77
(@squarepeg77)
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Joined: 2 years ago
Posts: 19
Topic starter 08/04/2024 9:37 pm  

And yes, I am running a software thermostat in Home Assistant as the Madoka is too “quirky” for my liking. 



   
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