Error while setting up modbus platform for sensor (SMA Sunny Boy Inverter)

Configuration
1

Hello,

I am trying to configure ModBus to read some values from my SMA Sunny Boy inverter it is not working. when I look into the Logs I get this error. Apparently the modbus platform setup is not working. I am running HomeAssistant 2021.1.5 on a RPI 4B.

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If I use a modbus simulator I can read the registers of the inverter. So I think the problem is with Home Assistant and not the inverter. Anyone have a hint on this?

2

Is hub1 the name of your hub?

3

Sorry. Tried hub1 to see if that was the issue but it stayed the same. Updated the actual error screen capture on top.

4

I do not have the line hub in the configuration.
From documentation it is optional and the default value is ‘default’

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It looks like the error has something to do with the hub?

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5

What’s the actual name of the hub? Try with this.

6

I do not have a hub. Not sure what that means or is. Do you know?

7

Ah okay. No I don’'t know, I’m sorry.

8

It is working now. For the benefit of others what I had to do was to setup a name in the modbus area and then use that name as the hub for each sensor in the registers section.

See example below:

modbus:
  name: SB7700TL
  type: tcp
  host: 192.168.XXX.XXX        # IP Address for SMA Inverter
  port: 502                    # TCP Port from Sunny Explorer

sensor:
   - platform: modbus
     scan_interval: 10         # Time in seconds for getting values
     registers:
    
    - name: sb_daily_pwr
      hub: SB7700TL
      unit_of_measurement: kWh
      slave: 3
      register_type: holding
      register: 30535
      scale: 0.001
      precision: 3
      count: 2
      data_type: uint

  - platform: template
    sensors:
    
      modbus_sb_daily_pwr:
        friendly_name: 'Day Yield'
        value_template: >-
          {{ states('sensor.sb_daily_pwr') }}
        unit_of_measurement: "KWh"
        icon_template: mdi:flash-circle

Hope this helps!

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