Forums

Forums
Renewable Heating
Air Source Heat Pum...
Stiebel Eltron Serv...
 
Notifications
Clear all

Stiebel Eltron Servicewelt COP figures compared with OpenEnergyMonitor

 
Air Source Heat Pumps (ASHPs)
Last Post by ajn9000 1 year ago
5 Posts
3 Users
1 Reactions
1,506 Views
RSS
 ajn9000
(@ajn9000)
Trusted Member Member
Joined: 1 year ago
Posts: 24
Topic starter 13/04/2024 10:10 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? 


   
Quote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3400
13/04/2024 10:25 pm  

@shaeney are you running OpenEnergyMonitor?

Pre-order: The Ultimate Guide to Heat Pumps

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
ReplyQuote
 ajn9000
(@ajn9000)
Trusted Member Member
Joined: 1 year ago
Posts: 24
Topic starter 13/04/2024 10:51 pm  

no - just have a meter on the supply


   
ReplyQuote
 shaeney
(@shaeney)
Eminent Member Member
Joined: 2 years ago
Posts: 13
14/04/2024 9:03 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!


   
👍
1
ReplyQuote
 ajn9000
(@ajn9000)
Trusted Member Member
Joined: 1 year ago
Posts: 24
Topic starter 14/04/2024 10:46 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


   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

Join Us!

Podcast Picks

Latest Posts

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
ShieldPRO →