Well, not with a kw of power being drawn, but let’s say something more reasonable, like 100 watts of power being draw from the whole circuit. Looking back at your graphs I see that there are small changes in wattage usage throughout the hour so I think it can detect it. It’s a matter of using the properly scaled CTs for the job. One more question about kw usage.
If the power plug is plugged into only one side of the panel, how do you calculate the voltage cycle for the other side? Do you just assume the opposite wave position based on the measured cycle? makes sense to me and should be very accurate. The reason I ask is what changes are made when you go into 3 phase? Using this approach, you would Need only one more power plug to measure the wild leg? But I think knowing which leg (ABC) you are tied to originally when you plug in the wall plug, the position of the wild leg can be calculated too.