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Daikin ESPAltherma and Home Assistant installation

Bash · 2026-06-11T10:45:14Z

I finally have some time to attempt to get ESPAltherma up and running on Home Assistant. I am quite pleased with myself already that I have managed to get some of this completed. I have started to follow the github process, GitHub - raomin/ESPAltherma: Monitor your Daikin Altherma / ROTEX heat pump with ESP32 · GitHub I have a lovely old Dell laptop that wasn't upgradeable to W11 and had an ageing battery. It a very low powered (3w when idle with W10 and the screen off), passively cooled, has 8gb of RAM and a 512GB SSD. So far I have been able to install Home Assistant on the laptop running on ubuntu. The laptop has the black screen with the HA logo in the top left hand corner. I have installed HA on my desktop computer and integrated the Shelly energy meter which is working perfectly. I have installed the HA MQTT vis the HA desktop. I have also purchased and received a (tiny!) M5NanoC6 ESP device which I need to program I assume. I have downloaded and installed Visual Studio Code and installed PlatformIO IDE core. This is as far as I have got and am starting to get a little out of my depth in how to complete the setup! I am a little bamboozled with setting up the M5 ESP device (Getting started - Step 1: Uploading the Firmware). I am not even sure about step 1 "download the repository folder and open it in Platform IO". @majordennisbloodnok Would you be able to help me continue down this rabbit hole?!! As a side note, I'd like to get the laptop screen to timeout as it is constantly on the HA black screen and ideally shut the laptop screen down whilst the HA server continues to run in the background. I am assuming I don't need the screen to be running all the time?! Thanks.

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Air Source Heat Pumps (ASHPs)

Last Post by Bash 36 minutes ago

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Bash

(@bash)

Reputable Member Member

Joined: 11 months ago

Posts: 221

Topic starter 11/09/2026 9:49 am

@majordennisbloodnok

Over the last few days the Heat Pump has kicked back into action as the outdoor temperature has dropped below 15c, which has given me the opportunity to take a look at the Home Assistant data.

So far so good. I have lots of data feeding through from the HP which is super helpful. I can now see in detail what's been happening in the background and the HP seems to be running as expected. I can now see when it cycles, which thankfully appears to be very little, only once an hour if that in this milder weather and track the energy consumption in much more detail.

I never managed to get Open Energy Monitor installed after many attempts, and for the moment have abandoned this. It would be great to see the SCOP etc, however I am not overly fussed as I know the HP must be running pretty efficiently, as the energy usage is around 300w per hour over a sustained period with little cycling.

As previously discussed, HA seems to log the detailed data over a 10 day period and then archives (if that's the right way to describe it) the data as an hourly (?) average.

This is ok, however I am thinking of increasing the 10 day window so that I can drill into the data over a longer period, particularly over this first full autumn/winter period.

I have HA running on an old ish very low power laptop which houses a 512GB SSD. With this in mind, what are the pitfalls of increasing the 10 day limit, to maybe 100, or perhaps more?

I am not monitoring much, just the HP and the Shelly energy meter. Will increasing this limit a good amount significantly increase the data storage amount and could it slow down the system, or make it run a lot harder (if that makes sense!)?

Thanks.

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