How to retain an accumulated value untill i reset it manually

Configuration
1

Dear all,

I have a shelly switch which is behind a heating device. The switch is triggered in a specific case and will swith off if certain values are met.
I want to calculate the minutes this switch has been on. I want to retain that data in a way untill i decide to reset that value.
I already created a sensor that is calculating the minutes per day the device was on. At midnight this data is reset.
How do i save this value and where? I want to be able to see over a period of time howlong the device was actually on, so i want to see accumulated data over time.

I hope someone can help me on this!

Marcel

2

Are you using the History Stats integration to track your on time?

If so share your config for it.

You can use an input_datetime helper in the start time template. Set the end time as now().

This way you can set the input_datetime to now() either manually or with a script called by a button to reset it.

3

Hi Tom,

I have created the following Sensor which is holding todays value of minutes the switch was on.

  • platform: template
    sensors:
    kachel_minutes:
    friendly_name: “Kachel Minutes”
    entity_id: sensor.kachel # Replace with the actual entity_id of your history_stats sensor
    value_template: “{{ states(‘sensor.kachel’) | float * 60 }}”
    unit_of_measurement: ‘min’

Can you help me further in retain this value before this sensor will get it’s reset before midnight and keep this value accumulated untill i decide to reset.

Many thanks so far!