It’s been a long time since I posted an update on the accuracy of my home IoTaWatt. I’ve had continuous monitoring with an IoTaWatt since Jan 17, 2017. The hardware unit has been upgraded several times as new versions were developed, but each time I just moved the SDcard to the new unit and picked up where the old one left off.
So I dug out my log and noticed that’s been a year since I last checked the IoTaWatt against the utility meter and the two revenue grade EKM meters that I have on my heat-pump and hot-water heater.
Here it is for almost two years: