Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
Last seen: Oct 4, 2026
@jamespa I just worked on the last post as you were also doing so. Good to see that we are on the same page. Your explanation captures exactly what ...
@cathoderay Well I managed to make a mistake with this myself! However, a simple thought experiment convinced me of the correct formulation. Cons...
We have a 6.56kW solar PV system (16x 410W panels) installed in March 2023. It uses a LuxPower 5kW hybrid inverter, which can provide up to 8kW output...
A refinement of the degree-day method The degree day method of heat loss calculation is very useful because it only requires smart meter data on dai...
@cathoderay Most of the time our hot water heating runs every 48 hours rather than every 24, since with relatively low use it takes that long for t...
Posted by: @cathoderay I'm not too worried about the DHW tank losses, the tank is like yours in an airing cupboard, but the airing cupboard is in th...
@cathoderay @jamespa Unfortunately, there was a slip up in my working in some of the earlier posts. When plotting measured power output vs. temp...
@cathoderay I'm pleased to see that your cleaned up data gives consistent results. It's great to see this analysis working in practice. Plotting ...
@judith Thanks for the advice on an air leakage test. It's definitely on the list for the two reasons that you suggest: finding leaks and also havi...
@cathoderay @jamespa I think a positive y-axis intercept is not necessarily an indication that something is wrong when the x-axis values are degree...
@jamespa @cathoderay I'm inspired to try out the degree days approach using my data. Gas only power Going step by step, first I've taken the el...
It is interesting to note that while the above graphical method worked very well with a large number of data points, i.e. 182 data points for 6 months...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Indevolt Batteries UK Support & Info Thread
I've got a podcast recording scheduled this week where ...
By Mars , 8 hours ago
-
RE: Renewable Heating Hub Homeowners' Q&A Podcast
I’m a little late posting this, but it’s genuinely one ...
By Mars , 8 hours ago
-
RE: How should the Boiler Upgrade Scheme be reformed?
Ah, that makes sense when a combi is in place. The boil...
By Batpred , 11 hours ago
-
RE: Replacing Storage Heaters with a Heat Pump in a Stone Cottage
@bobflux Thanks, that gives me something to check the i...
By Paul1098 , 11 hours ago
-
RE: DIY Heat Pump Installations: Navigating Legal and Regulatory Hurdles
Without doing some research I can't immediately answer ...
By JamesPa , 13 hours ago
-
RE: Tesla Powerwall (2) Calibration Cycles
For Powerwall calibration, avoid forcing repeated deep ...
By EnergyStorageTech , 20 hours ago
-
Over the years, due to the non barrier PEX underfloor h...
By bobflux , 1 day ago
-
RE: Getting closer to a finished Haier system
All the 45° elbows required for getting the primaries i...
By Singlespeed , 1 day ago
-
RE: battery storage without solar
Indeed, current on the grid input = current used for ch...
By bobflux , 3 days ago
-
RE: Who's your electricity provider and what's your tariff?
@papahuhu @papahuhu A lot of tears and sweat went into ...
By Andris , 3 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
We have the same problem, 12 mature trees clip the morn...
By Papahuhu , 4 days ago
-
RE: Solis inverters S6-EH1P: pros and cons and battery options
I had a battery and inverter installed a while ago, my ...
By Batpred , 4 days ago
-
RE: Is This Initial Free Quote From Octopus Trusted Partner Reasonable?
@ltron2 The EPC on our house is A-92, however that i...
By Rob of York , 4 days ago
-
RE: Heat pump branding. Clever, contemporary… or a bit too much?
The layout is confusing - much better like this: We b...
By downfield , 5 days ago
-
RE: Is it just me, or does tradesperson timekeeping and communication drive you absolutely mad?
My experience, backed up by opinions from various frien...
By Majordennisbloodnok , 5 days ago
SPONSORS
