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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 15/11/2023 11:51 am  

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

IMG 1903
IMG 1904

 


   
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2027
15/11/2023 5:09 pm  

Hello again Squarepeg 77, yes, we have a Daikin EDLA08E2V3 (heating only, not DHW) and like you, have doubts about the accuracy of the consumption and heat output statistics displayed on the MMI. They seem very granular to me, I either see ‘1’ or ‘2’ kw/H shown against a given 2 hour period. I suspect that the metering of consumption is very basic and possibly a little too crude for any degree of accuracy. Mine at least does show believable consumption figures that appear the same on the Onecta app (who thinks of these names?!) I will attempt to attach a screenshot of today’s Onecta display topically. One thought though, there are settings for the metering device which I think is to allow for different meters and the number of pulses given per kW and perhaps this is not set cprrectly at the present. They may be found by going to the installer profile (5-6-7-8) and looking under energy I think.Regards, Toodles

IMG 0411

 

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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Toodles
 Toodles
(@toodles)
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Posts: 2027
15/11/2023 5:18 pm  

I might add that we have had an Evergreen ‘Homely’ smart controller fitted 2 weeks ago and hope to report further on this soon; I am in contact with their rep who along with his technical team are currently monitoring my system remotely via the D-Comm and Hub. I suspect that the source of data for consumption will remain unchanged as I do not have any separate consumption metering for just the heat pump circuit. Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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 squarepeg77
(@squarepeg77)
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Joined: 2 years ago
Posts: 19
Topic starter 15/11/2023 8:29 pm  

@toodles I’ve found the setting in the Installer menu and on my system “Electricity meter 1” is currently set to None. There are lots of options. Would you be able to tell me what yours is set to?

My reading of the help entry is that I should be set to None, but maybe Daikin consider the MMI as an “external meter”. 


   
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Toodles
 Toodles
(@toodles)
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Joined: 3 years ago
Posts: 2027
15/11/2023 8:56 pm  

@squarepeg77 I think mine is set to the first (lowest) option in the list. Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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 squarepeg77
(@squarepeg77)
Eminent Member Member
Joined: 2 years ago
Posts: 19
Topic starter 16/11/2023 2:53 pm  

@toodles I changed mine to “1/10kWh” yesterday, but I’m not seeing any change to the energy usage reported by the MMI or ONECTA.


   
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2027
16/11/2023 3:00 pm  

@squarepeg77 Sorry, I’ll check mine later and write again. Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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Toodles
 Toodles
(@toodles)
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Joined: 3 years ago
Posts: 2027
16/11/2023 3:47 pm  

Have now checked, mine is set on ‘None’ - so that gets you precisely… nowhere I think! Sorry! Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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 jeromeD77
(@jeromed77)
New Member Member
Joined: 2 years ago
Posts: 1
21/11/2023 12:12 pm  

I have altherma 3 h ht 16 kw and the same problem. Problem started last year. Until last year (2 years) was consumption of energy working just fine and worked well. Until last year is every day 0 kw. I need that information, but nobody od Daikin can not help me. What to do ? 


   
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 Bob77
(@bob77)
Trusted Member Member
Joined: 3 years ago
Posts: 36
21/11/2023 1:37 pm  

I have a similar Daikin system and although it seems to accurately show the electricity used, I have my doubts over the accuracy of the heat produced.

According to the system it only produced 10,000 kWh of heat in a year, at a COP of 2.6. My heat loss calculations suggest it should be more like 14,000 kWh which would make the COP more like 3.6.

 

As for the "electricity in", my installer fitted a separate meter on the incoming supply, and it agrees pretty closely with what the unit thinks it has used (4425 kWh since installation on the external meter, versus 4441 kWh on the unit display).


   
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 Crasher
(@crasher)
Active Member Member
Joined: 1 year ago
Posts: 7
12/03/2024 8:51 pm  

@squarepeg77 did you ever get anywhere with finding a solution to the problem with electricity usage reading 0kWh?

My unit has started doing the very same thing since last week. I can't seem to be able to get any answers on how to resolve it.

Thanks.


   
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 HCas
(@hcas)
Reputable Member Member
Joined: 1 year ago
Posts: 101
08/04/2024 7:59 pm  

Were you able to solve the lack of electricity usage data?

Did anyone try to access the Onecta API directly? So not through the app or via the MMI, but directly in the API. 

CEO and co-founder at HavenWise


   
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