Static power usage attribute for devices to calculate power usage over time

[rdnzl (Ron)]

I have a lot of devices which have a known (and steady) power usage.
So i’m thinking of defining a static usage once in an attribute (eg 12 watt for a LED bulb) and count the power usage during the time it’s switched on so we are able to add them together and display power usage of all devices.

Anyone know if such a component exists, or have an idea how to do this with standard tools already part of Home Assistant?

[tom_l]

A way to document known always on?

The way you could implement this is: define a counter Trigger an automation every hour that increments the counter Define a template sensor that multiplies your counter by the known ventilation motor power in kW. This will give you a sensor that measures your always on load in kWh. For the lights, do the same thing but only trigger the counter increment automation every hour that the lights are on (use a condition). You can reset the counters whenever you want as well (e.g. when you get yo…