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Daikin COP / energy used measurement from MMI

squarepeg77 · 2023-11-15T10:51:31Z

Hi,I have a Daikin Altherma 9kW EDLA09DA3V3 with the "man machine interface" (MMI) running UI version 7.1.0. The MMI can display electricity usage and heat produced, but I'm getting basically 0kWh for the electricity usage. Some days report 0kWh, others 1kWh, but never more than that. The head produced metric looks plausible. The ONECTA app shows the same, inaccurate, electricity usage.I've raised this with Daikin and they suggested reseting the energy stats and powering the unit off for a while. I've done that, but there's been no discernible change in the measurements. I've also raised it with my installer (Octopus), but they've not made any suggestions yet. Does anyone else have a similar system and do you get sensible stats for electricity used? Thanks, Jonathan

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squarepeg77

(@squarepeg77)

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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

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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

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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

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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

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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

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