Just received my IoTaWatt last weekend and I’m extremely impressed so far.
The resolution of the data, amount of data presented and the built in graphs are all fantastic.
I have noticed that my incoming voltage seems to be approximately 4v too high.
I’m in the UK and everything else in the house suggests I’m running at a nominal 242v, yet the IoTaWatt seems to constantly be about 3-4v higher (245.7v).
I don’t have a properly calibrated meter to test against, but my 2 cheap RMS meters as well as a plugin monitor and a couple of my servers all seem consistent with the lower voltage.
I am using the IdealPower DE-06-09 wall-wart via a plug adapter to convert it to a UK 3-pin plug configured in IoTaWatt as “Ideal 77DE-06-09”.
As I believe they come pre-calibrated, I’m a bit wary of messing with it without getting confirmation first.
Greatest of thanks