not sure if this is possible, but is there away to read all devices that read out the watts and create one single dashboard tile to give the total amount of watts combined ?
You could read each one and then add them up and add it to one tile.
If you're trying to measure whole house power usage, you could opt for something like this:
https://www.amazon.com/Aeotec-Aeon-Labs-ZW095-ZW095/dp/B00XD8WZX6
The drivers for Hubitat for that are a bit hit or miss. I sold my gen 5. I went with iotawatt and it is so much better. @ogiewon did a great integration for it. You can also export data for graphs to import to Hubitat as well. Www.iotawatt.com .
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If you want to add everything together, you could do this in Rule Machine and output the result in a variable.
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Be careful adding a bunch of power monitors to your mesh. While many devices use minimal bandwidth, power monitors send a lot of data and can send it so often that it can overload the available bandwidth.
I had a power monitoring plug on my washer. That single device was sending out so much data that I was getting error messages on the Hubitat until I reduced the reporting frequency to once per minute to eliminate the errors.
If you have Zigbee monitors, you have up to 250 kbps bandwidth. Z-wave is limited to 100 kbps or less. WiFi has far greater bandwidth, but is less energy efficient.
