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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 10, 2025
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Topics: 17 / Replies: 2129
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RE: Real world connection to a heat pump over modbus

@toodles - thanks, in a Midea controller they are labelled H1 and H2. You can just make out H2 (bottom right) in this image of my wired controller wit...

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

Basically, yes. It is a two wire connection to those terminals in the wired controller. I also added a simple 120 ohm resistor across the terminals. ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Slash Your Heat Pump Bills Overnight

You weren't the only one. There is another recent truly bizarre post here, to which I nearly replied '"The broader challenge calls for a collective in...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Slash Your Heat Pump Bills Overnight

But that is pretty much what has been proposed in this thread... The point I am making is that if this happens widely, it may mean the tariffs end up ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Slash Your Heat Pump Bills Overnight

Another point to consider: what happens if time of use tariffs become commonplace, and many more people time their electricity use according to their ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: No-code, plug-and-play monitoring for your heat pump

Apparently so, according to their website. Samsung units have a modbus connection via an add-on board.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: No-code, plug-and-play monitoring for your heat pump

Good thinking. I've also had a look at the connections in the photo, and it looks like a standard two wire modbus/RS485 hookup plus DC power supply:

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: No-code, plug-and-play monitoring for your heat pump

Very interesting indeed. I think at a basic level it is identical to my system: modbus connection to the heat pump, then read and write data over that...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump efficiency v Outside Air Temperature

Are you able to describe how you do this, what kit you use, and how you get the data into a computer? At the moment I use the sensor in the heat pump ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I'm sure that is absolutely right!

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I think it's called market forces, the efficiency of markets, or whatever those who work in the field that makes astrology look reputable call it thes...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Which is the point I was trying to make using lay language. The throttle effect (at 11 down to 8 kW) is around 27%, the efficiency losses are (much?) ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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