Odroid N2+ ARM SBC with an External USB NMVE 500 GB drive as /home
Using a Kill A Watt meter, measured at the wall outlet. USA 120 VAC 60 Hz
I entered the cost per Kilowatt hour at 14 cents US (summer rates) and Kill A Watt calculated the yearly cost of operation 24 hrs a day 365 days.
The readings were at idle. Under load the wattage goes up to 4 watts and occasionally jump up to 5 watts.
Pudge
Disclaimer:
Sorry, I forgot that these power measurements were taken before adding the external USB NVME. So the measurements are accurate for the Odroid N2 itself, but as represented in the photos the power usage of the External NVME would have to be added on. Sorry for the slip up.