dwd_weather: Irradiance forecasts no longer available

Hi there,

I have recently upgraded to HA 2023.9.3 and I have upgraded dwd_weather through the GUI to the latest version (should be 2.0.1).

I have been using my own template sensors to calculate total rest of day or rolling 24 hour irradiance forecasts and the like based on dwd_weather to have an idea how much heat to expect from my solar panels in the near future and to make decisions off of that.

Here is one example that used to work for several months prior to the two upgrades (HA and dwd_weather) I made:

- platform: template
  sensors:    
    sun_irradiance_staaken_rest_of_day_forecast:
      friendly_name: "Rest of day forecast of irradiance"
      unit_of_measurement: 'W/m^2' 
      value_template: >-
        {% set irrTotal = namespace(value=0) %}
        {% set current_hour = now().hour %}
        {% set hours_left = 24 - current_hour %}
        {% for irr in state_attr('sensor.sun_irradiance_staaken', 'data') -%}
          {% if loop.index <= hours_left %}
            {% set irrTotal.value = irrTotal.value + irr.value %}
          {% else %}
            {% break %}
          {% endif %}
        {%- endfor %}
        {{ irrTotal.value }}

After the upgrades I found the following error in the logs:

TemplateError(‘TypeError: unsupported operand type(s) for +: ‘int’ and ‘NoneType’’) while processing template ‘Template<template=({% set irrTotal = namespace(value=0) %} {% set current_hour = now().hour %} {% set hours_left = 24 - current_hour %} {% for irr in state_attr(‘sensor.sun_irradiance_staaken’, ‘data’) -%} {% if loop.index <= hours_left %} {% set irrTotal.value = irrTotal.value + irr.value %} {% else %} {% break %} {% endif %} {%- endfor %} {{ irrTotal.value }}) renders=4>’ for attribute ‘_attr_native_value’ in entity ‘sensor.sun_irradiance_staaken_rest_of_day_forecast’

I checked the sensor sensor.sun_irradiance_staaken in the developer tools and it showed the sensor’s state as “unknown” and the attribute values looked like this:

state_class: measurement data:

• datetime: ‘2023-10-04T19:00:00.000Z’ value: null
• datetime: ‘2023-10-04T20:00:00.000Z’ value: null
• datetime: ‘2023-10-04T21:00:00.000Z’ value: null
• datetime: ‘2023-10-04T22:00:00.000Z’ value: null
• datetime: ‘2023-10-04T23:00:00.000Z’ value: null (…)

Before the upgrades I would see numeric values instead of the null values

Since I head read the notes on the new trigger/action in templates and the breaking change in dwd_weather in the latest release I thought it might have to do with that and I updated my sensor definition to:

- template:
  - trigger:
      - platform: time_pattern
        hours: "/1"
      - platform: homeassistant
        event: start
      - platform: event
        event_type: event_template_reloaded
    action:
      - service: weather.get_forecast
        data:
          type: hourly
        target:
          entity_id: weather.staaken_staaken
        response_variable: irradiance_data
    sensor:
      - name: "Rest of day forecast of irradiance"
        unique_id: sun_irradiance_staaken_rest_of_day_forecast
        state: >-
          {% set irrTotal = namespace(value=0) %}
          {% set current_hour = now().hour %}
          {% set hours_left = 24 - current_hour %}
          {% for irr in irradiance_data.data -%}
            {% if loop.index <= hours_left %}
              {% set irrTotal.value = irrTotal.value + irr.value %}
            {% else %}
              {% break %}
            {% endif %}
          {%- endfor %}
          {{ irrTotal.value }}
        unit_of_measurement: "W/m^2" 

after that the error changed and it now is:

Template variable warning: ‘dict object’ has no attribute ‘data’ when rendering ‘{% set irrTotal = namespace(value=0) %} {% set current_hour = now().hour %} {% set hours_left = 24 - current_hour %} {% for irr in irradiance_data.data -%} {% if loop.index <= hours_left %} {% set irrTotal.value = irrTotal.value + irr.value %} {% else %} {% break %} {% endif %} {%- endfor %} {{ irrTotal.value }}’

so I manually tested the new get_forecast service like:

service: weather.get_forecast
data:
  type: hourly
target:
  entity_id: weather.staaken_staaken

and I got this:

forecast:

• datetime: “2023-10-04T19:00:00Z” condition: cloudy wind_bearing: SW wind_gusts: 5.14 precipitation_probability: 11 temperature: 14 templow: 14 wind_speed: 2.57 precipitation: 0 (…)

This tells me two things:

1. I will slightly have to adjust my code as the structure has changed a bit
2. there is no point in fixing the issue above as the attribute I have always been using (irradiance) is no longer part of the forecast

Obviously I am missing something but I can’t figure out what it is. Any hints how to solve this and get the hourly forecasts for irradiance back would be highly appreciated!

Thanks, Alex