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Grant Aerona3 - Home Assistant control via Modbus

 
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Air Source Heat Pumps (ASHPs)
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 AlanW1212
(@alanw1212)
New Member Member
Joined: 9 months ago
Posts: 1
01/12/2025 10:22 am  

Has anyone got past this screen to set up the integration with a USB connection

Screenshot (56)

Any help would be gratefully received 

From a relative novice!



   
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 Vanq
(@vanq)
Active Member Member
Joined: 9 months ago
Posts: 11
10/05/2026 3:15 pm  

Posted by: @grantmethestrength
↑

Good afternoon all,

    I have finally got around to documenting my journey in getting around the woeful controls that the destroyers installers installed when they put in my ASHP. I have used a Waveshare POE ethernet to modbus converter and now have full remote control of my ASHP. The next stage of my project is to build a self hosted AI agent probably using Mistral, N8N and MCP in order to create my own version of a Homely type controller.

If this floats your boat then I commit to thee: https://github.com/Si-GCG/Grant-Aerona3-modbus/tree/main

If you want to join in the fun let me know and I will happily share everything with you as I continue this journey.

Kind Regards

Si

I'm trying to control my Grant Areona 3 with modbus, I can read everything but can't write to it.  Every write reverts.  Did you have this problem, was there a setting change I need to do to release a lock-control on it first?

 



   
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 Grantmethestrength
(@grantmethestrength)
Reputable Member Member
Joined: 2 years ago
Posts: 185
Topic starter 10/05/2026 3:52 pm  

what controller are you using?


Kind Regards
Si
——————————————————————————
Grant Aerona3 13kW
13 x 435w + 13x 480w Solar Panels
Sigenergy 10kW Inverter
25kWh Sigenstor battery


   
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