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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 18, 2025
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Topics: 17 / Replies: 2149
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RE: PV Inverter - monitoring and control using Modbus & RS485

@majordennisbloodnok - I'm not in the business of telling anyone they must do something a particular way, but I am in the business of saying there are...

2 years ago
Forum
Your Home
Reply
RE: Real world running cost estimate for 20KW ASHP

The ideal is to go for for something that just exceeds your heat loss at design temp (-2 or thereabouts depending on where you are) when running at th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: PV Inverter - monitoring and control using Modbus & RS485

@editor - Mars, don't worry, I wasn't in any way put out, just wanted to plug some of the reasons why I think modbus has a lot to offer!

2 years ago
Forum
Your Home
Reply
RE: Real world running cost estimate for 20KW ASHP

Sadly, this sort of nonsense is all too common. At one point I very nearly issued a decree that if any employee of a certain heating company were seen...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: PV Inverter - monitoring and control using Modbus & RS485

Don't forget I have been talking about it for ages! It has many advantages. It is (if your heat pump/inverter/whatever has a modbus interface, which m...

2 years ago
Forum
Your Home
Reply
RE: Real world running cost estimate for 20KW ASHP

A 20kW ASHP to supply a 13.22kW demand seems a bit on the high side, even allowing for the fact most heat pump suppliers inflate their rated outputs b...

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

Great, you must be very pleased! I'm also sure others will welcome a separate thread with details of your wider setup, and a slightly different emphas...

2 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Local monitoring and control of inverter - gaps in understanding

@majordennisbloodnok - my hunch is that it is the device address. This can be a gotcha - you can't ask it what it's device address is without knowing ...

2 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Local monitoring and control of inverter - gaps in understanding

@majordennisbloodnok - cripes, it sounds complicated! At its simplest, a modbus connection is just two wires, A to A and B to B, plus (optionally) a...

2 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: My horrific Samsung heat pump installation and experience

Once you get the hang of it, it isn't complicated. This is a very simple unadorned example that gets data from my minute data csv file and plots it: ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My horrific Samsung heat pump installation and experience

@iantelescope - date-time formats can be very tricky, especially with software that likes to be 'clever' - and then gets, for example, month and day m...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My horrific Samsung heat pump installation and experience

If you can log the data to csv files (eg using python), then you can plot the data any which way using any spreadsheet. You can also use python plotti...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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