Template Help with adding 2 sensors

I am trying to add together 2 sensors that return in hours. The idea with the formula is correct, but I don’t know how to write it.

I get an error like this: TypeError: unsupported operand type(s) for +: ‘float’ and ‘str’

{{ (states('sensor.fan_1') | float *3600) + (states('sensor.fan_2') | float * 3600) | timestamp_custom('%H:%M', false) }}

I’m not entirely sure, but in my opinion you are running timestamp_custom only on the second state:wink:

Try it like this:

{{ ((states('sensor.fan_1') | float * 3600) + (states('sensor.fan_2') | float * 3600)) | timestamp_custom('%H:%M', false) }}

Patrick is correct, remove the inner-most ) and (… so that the function is applied after the two floats are summed:

{{ (states('sensor.fan_1') | float *3600 + states('sensor.fan_2') | float * 3600) | timestamp_custom('%H:%M', false) }}

Thank you!

Thank you!