I have two questions related to keeping track of power consumption of devices in Z-way
First, is there an app for that use case specifically, or do you use a more general "summation of sensors" kind of app?
Second, some Z-wave switches do not monitor power consumption, but really if you've got a couple of lights with in total 35W power draw, you basically know what will be consumed once you turn the switch ON. And, if the dimmer level is at 20% then you could estimate the consumption to be about 20% of that as a rough estimate. Will Z-way allow you to add a power consumption that is not measured by the device itself somehow?
Discussions about Z-Way software and Z-Wave technology in general
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I guess not. If the device will not transmit back power values, you can try a trick:
You can make an algorithm for yourself based on How much power they consume per hour.
You can take a look on dimmer datasheet of light bulb datasheet and maybe they have a diagram of consumption.