Custom energy sensor with value from API

Configuration
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1

Hi guys

I have a power manager that offers an API to read the consumption in watt hours.

For instance I get this back while charging the car:

“cWh”: 24.09,

I created a sensor with the following code in sensors.yaml:

- platform: rest
    name: consumption in kilo watt hours
    resource: http://192.168.xxx.xxx/v2/point
    value_template: "{{ value_json.cWh | float * 0.001}}"
    state_class: total_increasing
    unit_of_measurement: kWh
    device_class: energy
    scan_interval: 10

When checking the returned value I get this:

0.02409

So far so good. If I now add this sensor to the energy dashboard the consumption in one hour is way too low. It should be around 9 kWh but it’s rather around 0.12 kWh.

What am I missing?

Thanks for any help!