Reading sensor data from lambda-heatpump using modbus TCP

Installation
1

yesterday i received my raspberry pi 4, and I managed to install HA successfully (i never touched a raspberry pi before, and I am new to home assistant, too)! :slight_smile:
Several integrations work well (tibber, homematic IP, fritzbox,…), and I started playing with the dashboards.
I tried to integrate the values from my heatpumpt (lambda EU13L) via modbus, but nothing happens.
I performed the following steps:

  1. copy the code from GitHub - RalfWinter/lambda-heatpump-modbus-tcp-HA: Home Assistant configuration.yaml additions to integrate Lambda heatpump and deleted all sensors except the first one.
  2. delete the parameter <count: 1> due to error "Invalid config for [modbus]: EU13L_Ambient_Operating_State: count: 1 cannot be combined with data_type: uint16"
  3. Save and import the YAML-konfig and restart HA

I expect the heatpump to appear in section “Integration”, but nothing happens.

The heatpump is response via modbus, I checked it with modbuspoll from my windows PC. I use the following settings:

modbus:

  • name: “EU13L”
    type: tcp
    host: 192.168.178.136
    port: 502
    sensors:
    - name: EU13L_Ambient_Operating_State
    address: 0001
    input_type: holding
    unit_of_measurement: “”
    state_class: total
    scale: 1
    precision: 0
    data_type: uint16

Can you please give advice what to do and how to receive values from the heatpump? Thank you very much!

2

Search on entities list

3

thank your for your quick support, i found all entries. :slight_smile:

unfortunatly there are no values, all entities are “not available”:
image

Before importing the yaml-kofig I had to remove the line <count: 1> due to an error message:

image
image1024Ă—116 14 KB

Any idea?

4

You should get any error

6

Hast du es mittlerweile hinbekommen? Ich habe das selbe Problem. Ich schaffe es leider nicht, eine Verbindung aufzubauen.

7

Probiere es mal hier mit deinem Problem:

Ich bekomme die Sensorwerte in HA angezeigt (bis auf die EMS-Werte [Register 0100-0104]).

10

external Return temp calculation (since there is no Modbus register for that):

{% set temp = states('sensor.eu08l_ambient_temp_calculated') %}
{% set Toffset = states('sensor.eu08l_heating_circuit_1_temp_flow_setpoint_offset') %}
  {% if (temp == 'unknown') or (Toffset == 'unknown') %}
    unknown
  {% elif (temp == 'unavailable') or (Toffset == 'unavailable') %}
    unavailable
  {% else %}
    {% set temp = temp | float %}
    {% set Toffset = Toffset | float %}
    {% set Ts22 = 25 | float %}
    {% set Ts0 = 30 | float %}
    {% set Ts_22 = 35 | float %}
    {% set dT = 5 | float %}
    {% set VL = ( Ts0 - temp * (( Ts0 - Ts22 if temp > 0 else Ts_22 - Ts0 )/22 )+ Toffset) | round(2) %}
    {{ VL - dT }}
  {% endif %}
12

Kannst du uns ein bisschen Kontext/Erklärung geben? Z.B.

  • Was fängst du mit dieser errechneten RL-Temperatur an?
  • Woher kommt die Rechnung?
13

Mit Hilfe der RL Temperaturen kann bestimmt werden wann die Lambda abschaltet bzw einschaltet.
Die Rechnung habe ich erstellt und getestet.