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Stiebel Eltron Servicewelt COP figures compared with OpenEnergyMonitor

 
Air Source Heat Pumps (ASHPs)
Last Post by ajn9000 2 years ago
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 ajn9000
(@ajn9000)
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Joined: 2 years ago
Posts: 24
Topic starter 13/04/2024 9:10 pm  

We have a Stiebel Eltron WPL25 ASHP with access to lots of data via their Servicewelt portal.  This includes data on heat produced, power consumption and COP.  This data is created using a proprietary algorithm.  I'm trying to get a figure for percentage uncertainty for this data, but so far SE are unable to provide this.  They say that their data is a guide.  Question: has anyone fitted OpenEnergyMonitor level 3 (with heat meter) to a SE heat pump and compared actual measurements with the data SE provide? 



   
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Mars
 Mars
(@editor)
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Joined: 5 years ago
Posts: 3891
13/04/2024 9:25 pm  

@shaeney are you running OpenEnergyMonitor?


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 ajn9000
(@ajn9000)
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Topic starter 13/04/2024 9:51 pm  

no - just have a meter on the supply



   
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 shaeney
(@shaeney)
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Joined: 2 years ago
Posts: 13
14/04/2024 8:03 am  

I also have the WPL25.

 

I find the Steibel Eltron Portal very, very basic.

So I also run a Home Assistance Green Pi, which gives me far better information and graphs/visuals. However, its integrated with the SE data via CanBus. So its their data, as opposed to a separate monitor.

I do have a SunSynk inverter with a CT clamp on the entire supply, so I can kinda see whats happening at a higher level too.

 

So today so far, total consumed is 40KWH

EV took 20KWH

Battery charge took 12KWH

Heat Pump is reporting 3 KWH on Hot Water and 4KWH on Heating.

So I think it's there, or there abouts correct.

Hope this helps!



   
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 ajn9000
(@ajn9000)
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Joined: 2 years ago
Posts: 24
Topic starter 14/04/2024 9:46 am  

@shaeney thank you.  SE have 2 portals.  The standard offer is very basic - connects to the WPM (HP manager/controller), but the online portal is much more comprehensive: https://servicewelt.stiebel-eltron.de/   You need an account and have access to everything as far as I can see.  You can select parameters and graph over periods of time.  You need to call them to get access. 

I have billing quality meter on the compressor supply, and a CT clamp on the controls/pumps supply.  If I compare the kWh used between this meter and what SE is recording for the compressor via the portal, I am getting 7% difference - actual use is 7% higher than SE is presenting.

The problem is that I have no way of measuring the actual heat produced (I don't have OpenEnergyMonitor) - so I have no way of working out the margin of error for the heat produced data provided by SE (ie, is this also 7%?).  So I can't assign a margin of error figure to my COP calculations.

I am preparing a presentation for a village meeting on heat pumps and I want to be as rigorous as possible with my data.  This is the video we created for our project which is to encourage retrofitting: https://www.youtube.com/watch?v=Ucf0-L8y9Q0



   
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