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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 14, 2025
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Topics: 17 / Replies: 2131
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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)
Reply
RE: Real world connection to a heat pump over modbus

Yikes, it has suddenly got cold! Heating on just after 7am this morning, and here's a preview of what's to come in this thread: a chart of the first f...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pumps and on/off working - starting to quantify it

Hopefully Derek will survive, and be able to tell us what the experience felt like.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Real world connection to a heat pump over modbus
2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 58
Views: 13578
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RE: Connecting Home Assistant to a Midea Heat Pump

Just for the record, here is a comparison of the two ways I have tried to connect to a Midea heat pump, firstly all in Home Assistant using the midea_...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Local monitoring and control of inverter - gaps in understanding

@majordennisbloodnok - I think your problem is generically the same problem that I had, how to make a working physical connection to a modbus device, ...

2 years ago
Forum
Solar Photovoltaic (PV)
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RE: Samsung ASHP scheduling help

That makes sense, and then you set up your own adaptive WCC. It will be very interesting to have feedback on how you get on.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung ASHP scheduling help

I think that is going to be the problem - won't the internal Samsung control circuits constantly set the LWT to what it thinks it should be, and so ov...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung ASHP scheduling help

That's a pity. Luckily the Midea manual does document the registers to set (and get) the weather comp curve endpoints (complete with typos), and a qui...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung ASHP scheduling help

As I think you know, I am planning to do something similar (control via modbus, using python plus minimalmodbus) with my Midea heat pump. Just a thoug...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Connecting Home Assistant to a Midea Heat Pump

@leichat - very useful. It looks like it has a direct modbus connection. From 3:17 in the video: Modbus RTU / RS485 connections are two wire (and ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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