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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 12, 2025
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Topics: 17 / Replies: 2129
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RE: Real world connection to a heat pump over modbus

And the formulas - still trying to get my head round them, and I am no stranger to spreadsheets. It looks like you imported the data from the Midea...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

OK, I think I get it (col D is confusing, because the header only has COP/LWT), but the numbers still don't reflect reality eg (from the zoomed in cha...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

I've just zoomed in on the frequent cycling (from 0000 to 0200 this morning), and close up, it doesn't look too bad: It's 'only' cycling twice...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Real world connection to a heat pump over modbus

The corresponding energy out figures summed from the csv data files are 257 kWh for the Midea app, 264 kWh for my calculated figure, giving average to...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

Duh, I can be so dumb sometimes! I've just remembered I've got an independent way of checking energy in: the external heat pump dedicated kWh meter. T...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

@derek-m - I don't think the model and the real world agree, but there is one thing I am not sure about in the spreadsheet, what to enter for the Tota...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

Here it is, the mother of all heating charts: No need to comment that it is far too busy, I know it is, but it is all the data on one chart. C...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

I'm not sure what Dash is, but I am pretty sure it uses plotly under the hood, as many of the plotly manual pages have a section usually towards the e...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Real world connection to a heat pump over modbus

@mikefl - it sounds as though we have very similar objectives, and I am very happy to collaborate on ideas and practicalities etc. It also sounds as t...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

@editor - can you please remind me of the attachment/media upload file size limits, and whether animated gifs are allowed. I've just tried to attach a...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

Here's the hourly trailing global ie heating and DHW combined COP, (a) from the Midea app's total energy (kWh) in and out numbers, and (b) calculated ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Real world connection to a heat pump over modbus

Just standard weather compensation at the moment, room stat is set to 26 degrees, ie always on. I wondered about that as well, and I think it hap...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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