I would like to exchange information with other owners of an Ovum heat pump who would also like to realise an integration in HASS.
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Hi!
I would like to integrate our Ovum heat pump in HASS as well. I tried it using a modbus configuration, but after being able to read different sensors for a year, it now failed and I cannot get it to work again…
Hello,
Very nice, maybe we can exchange ideas and make the best of it.
I have now also connected my installation with Modbus and HASS. For this I use a RS485-USB converter directly on the computer with HASS installation.
With a small C program I was able to trace ALL parameters and created a Modbus map which shows me all addresses with the most important information (e.g. unit, precision, possible lookup values etc.).
In HASS I use the Modbus configuration and have created sensors.
How did you connect your Ovum?
Which parameters have you already read out?
At which error does it no longer work or where does it seem to hang?
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Hi,
any chance you could share your modbus map? I’m also very interested in hooking up our OVUM. I’m not sure where to start however. Where do you connect the RS485 module? I have a modbus to ethernet module laying around somewhere that I can use.
Hi,
The simplest option is to connect to ModbusTCP. Ideally, you should have purchased the Epoca remote maintenance module with your system and activate ModbusTCP there.
To read the parameters and create your own Modbus map, I recommend my python script which also creates a complete YAML file containing all the sensors of the Ovum heat pump.
I have collected the information on the technical connection of the interface in the wiki of my repo.
Here is the link to my repo and the wiki:
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Thinking about getting an ovum heat pump. How good is the modbus integration working with the heat pump? If anyone could share their experiences, I’d be grateful 
Especially interested in using HA with our pv panels and utilizing self consumption of solar for the hp
Hi,
in the documentation on your wiki, you wrote under “Interface via Modbus TCP” the following “If you have purchased the “EPoCA EVlink Wi-Fi remote maintenance” component, you can operate Modbus TCP via it.”
I am actually getting my OVUM HP installed this week and I have purchased the EVlinking EVCO Wifi Module with the remote maintenance option.
Could you detail a bit, where I would connect my own Modbus cable to operate via this device?
Thanks a million. Daniel.
if you got the ovum delivered with the newest firmware running, you can connect a RJ45 network Cable direct to the controller and connect over Modbus TCP. I got it like this and will now test it.
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Thanks for your reply.
I have actually used to path via the EPoCA Interface and enabled the remote Modbus TCP settings in the EPoCA Web UI. Works very well so far and I am reading the essential values.
Now … for the next step, I’d like to also modify some registers in order to deactivate/block the OVUM heat pump in times of high energy cost. I have also signed up to Tibber for dynamic energy prices and I have a sensor with the energy cost forecast for the next 24h.
Has anyone went the step and modified the specific registers? Needs to be done in the automation.yaml, correct?
Thanks for any pointers …
@dhopkins1000
No, I haven’t gotten that far yet. I have uploaded my configuration to Github.
In the first part I directly access the controller of the cube memory.
In a second part I try to access data from the EPOCA module.
But I haven’t managed to do that yet. Maybe you could help me here.
From line 519, the Epoca module is accessed for COP and heat quantity. But this does not work.
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Any news?
Easy to integrate in HA?
Maybe i’ll also buy an Ovum Heatpump.
After having gone through the winter period, I must say that the performance of the Ovum HP is pretty convincing. At least we stayed warm and the COP is respectable.
In regards to Home Assistant integration, the modbus polling of the EPOCA module works so far. I know others have trouble with it but “fingers crossed”, it works. Only thing is, that my polling of so many parameters seems to conflict with the data transfer to the EPOCA Cloud, but since I get all relevant data in HA, I do not need the EPOCA Cloud.
I also managed to create an automation to turn off the heating part of the heat pump, whenever the energy prices are +10% above daily average for the next hour. That also works via modbus register #15728)
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What can you control in Modbus register 15728?
Have you built an active controller, I’m actually trying to control the whole thing via the solarmanager, but they haven’t quite managed it yet.
I would be interested if you could give me some details ?
So far I have managed to read out some useful information and display it accordingly.
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