Lambda Heat Pump

Third party integrations
1

Lambda Heat Pump

I get a lambda heat pump Home - LAMBDA Wärmepumpen (lambda-wp.at).
I would like to control this via the HomeAssistant and send the PV surplus to the heat pump. As an inverter I get a Q.HOME⁺ ESS HYB-G3 identical in construction to Solax. The heat pump is to be controlled via Modbus. Here is a manufacturer’s description of the Modbus of the heat pump. Modbus-Protokoll-und-Beschreibung.pdf (lambda-wp.at).

In the OpenWB forum I found a solution here. Einbindung Lambda Wärmepumpe - openWB Forum

Can such an integration be created or is something already planned?.

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Take a look here: GitHub - RalfWinter/lambda-heatpump-modbus-tcp-HA: Home Assistant configuration.yaml additions to integrate Lambda heatpump
I did a quick test and it look good so far.

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Thank you,
I’ll take a closer look at that, but it’s going strongly in the direction I imagined. What I haven’t seen in a nutshell is whether it can also be used to send the PV surplus to the heat pump.

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Hi Ralph,

I’m pretty new in HA and I’m a happy new user of a Lambda Heat Pump - since 3 days :slight_smile:. And of course, I’m directly starting with playing around with all that stuff, and I found your post during my research. May I ask if you were successful in adding the HP to HA? If yes may you are willing to share your results here with me? I really would appreciate that… I’m looking to your positive answer…

Thx and brgds
Lutz

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This should work. Assuming HA is your lead system for energy management, you can tell Lambda how much power it should use by writing the corresponding value as follows:

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see linked documentation above

See the excellent Modbus documentation on how to do this: Modbus - Home Assistant

I am looking into getting a Lambda next year, this how I am planning to set it up. Of course, you can probably link Lambda to your inverter directly, it basically boils down to the question of where you want your energy management to live.

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Hi, I created a HACS integration for the Lambda Heatpump Github Lambda Heatpumpt

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How can I change the IP address for the heat pump in HA.

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Hi, can I also write with this integration to the Lambda via Modbus? There are some Sensors that allow this according to the documentation. I’d like to write the Offset Temperature for the Heating Circuit, if there is a lot of Solar power and possibly the Operation State.

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Well for now I ended up using this setup floriansProjects/lambda-heatpump-homeassistant: Dokumentation der Integration einer Lambda/Zewotherm Wärmepumpe per Modbus (TCP) in Homeassistant. I expanded it and now I can controll the Heat Ciurcuit offset temperature and the warm water boiler temperature via a “climate” control. When there ist a lot of energy from solar, I can now increase the hotwater temperature or the temperature of the heating dynamically. It would be nice, if someone found a possibility to make a swich to turn on/off the heating circuit via home-assistant.

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Why do you use a manual override for water temperature? You can use Home Assistant to feed your PV power into the heatpump and it will do all that automatically.

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I have a thermal solar plant on my roof and on sunny days i want to prevent the heatpump from making the water. Since it is not possible to switch the Boiler “off” via Modbus, I change the Water Temperature to only 25°.