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Adventures in DIY Smart Thermostating

 
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Air Source Heat Pumps (ASHPs)
Last Post by Derek M 3 years ago
18 Posts
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
26/04/2023 6:04 pm  

@iancalderbank

You could try checking your version of firmware against others with working systems.



   
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cathodeRay
 cathodeRay
(@cathoderay)
Famed Member Moderator
Joined: 4 years ago
Posts: 2895
26/04/2023 7:48 pm  

Posted by: @scrchngwsl
↑

Please do post about it on the forum if you ever do this as I'd be very interested to know what your experience is.

Rest assured I will, but don't hold your breath, it will probably be next autumn when the days start getting cooler again before I do this in earnest, though I have to say today was blooming cold for late April.

Posted by: @scrchngwsl
↑

That way you're not limited to a straight line or a x^(1/a) curve or whatever.

I agree, see also my comments on the other thread (<=link) about the potential of using a fixed LWT and then setting that fixed LWT from a DIY programmed weather curve.

 


Midea 14kW (for now...) ASHP heating both building and DHW


   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
26/04/2023 8:45 pm  

@iancalderbank

If you look at the manual for the Samsung Modbus card, there is a register which needs to be set to enable write operations to be performed. I would suggest that you check this if you have not already done so.



   
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 scrchngwsl
(@scrchngwsl)
Estimable Member Member
Joined: 4 years ago
Posts: 91
Topic starter 26/04/2023 9:42 pm  

@iancalderbank @derek-m - Wow, I can't believe I never thought of using my PV array data to compensate for solar gain! Thanks, will investigate this. Presumably the amount of energy absorbed by the house is proportional to the amount of energy converted by the panels, with some adjustment for the angle of the sun throughout the day. Setting up a fake array in HA for each orientation of my house might provide the right correction to the reads from my actual SE-facing array.

@iancalderbank - I'm in total agreement, I would much prefer a local-only solution, as I'm dependent on the good will of Mitsubishi to keep their servers running in exactly the same state for as long as I have the heat pump.


ASHP: Mitsubishi Ecodan 8.5kW
PV: 5.2kWp
Battery: 8.2kWh


   
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 iancalderbank
(@iancalderbank)
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Joined: 4 years ago
Posts: 643
27/04/2023 8:59 am  

Posted by: @derek-m
↑

@iancalderbank

If you look at the manual for the Samsung Modbus card, there is a register which needs to be set to enable write operations to be performed. I would suggest that you check this if you have not already done so.

is there ? which one? I've read that manual dozens of times, nothing jumped out at me like that. if you mean 64 "restrictions on the remote control ", yes, I already checked that (you already asked me to , a month or so back....)

please bear in mind (as per the other thread) I have already documented that I have run code (not written by me, I hasten to add) that successfully writes to a bunch of registers that enable some "more registers" (that aren't enabled as standard for whatever reason). I'm successfully reading those "more registers" thus proving that the "write" that enables them has worked.

ref firmware - that is a possible line of attack, but if you google "samsung heat pump firmware" there is nothing that jumps out, it doesn't look like anyone else has been down that road.  just a bunch american discussion where "heat pump" means air conditioner. I am not even sure how to find out or tell what firmware its running or is the latest. certainly not something I'd attempt to go into myself.  when I get my usb-modbus adapter I'll be trying it from a laptop, hopefully will get a better process of stepping through what does and doesn't work.

 


My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
11.9kWp of PV
41kWh of Battery storage (3x Powerwall 2)
2x BEVs


   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
27/04/2023 9:51 am  

Posted by: @iancalderbank
↑

Posted by: @derek-m
↑

@iancalderbank

If you look at the manual for the Samsung Modbus card, there is a register which needs to be set to enable write operations to be performed. I would suggest that you check this if you have not already done so.

is there ? which one? I've read that manual dozens of times, nothing jumped out at me like that. if you mean 64 "restrictions on the remote control ", yes, I already checked that (you already asked me to , a month or so back....)

please bear in mind (as per the other thread) I have already documented that I have run code (not written by me, I hasten to add) that successfully writes to a bunch of registers that enable some "more registers" (that aren't enabled as standard for whatever reason). I'm successfully reading those "more registers" thus proving that the "write" that enables them has worked.

ref firmware - that is a possible line of attack, but if you google "samsung heat pump firmware" there is nothing that jumps out, it doesn't look like anyone else has been down that road.  just a bunch american discussion where "heat pump" means air conditioner. I am not even sure how to find out or tell what firmware its running or is the latest. certainly not something I'd attempt to go into myself.  when I get my usb-modbus adapter I'll be trying it from a laptop, hopefully will get a better process of stepping through what does and doesn't work.

 

Please forgive me for having forgotten one of your previous posts from one month ago, and for me having not read back through all your previous post to ensure that I had not forgotten anything.

I'm afraid that being old and decrepit I easily get confused, and mix up the messages from the numerous people, whose problems I am trying to help resolve.

I appreciate I will only get a three out of ten, must try harder. 🙄 

 



   
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