587 Voltage dips! What is going on?

[kevin1]

Could be lots of other causes.

1. A 240V power hog turning on and off at your house or at a neighbors that is on the same distribution transformer. I say 240V because issue appears to be happening on both legs.
2. Your utility having difficulties. Which utility provides your electricity.

If you PM the CSV of your Power Quality alerts, I can post a graph like this:

Can Sense measure short voltage transients?

@rmann One more way to visualize the data - as a scatter plot vs. UTC Time of Day (not your local timezone) of the L0 and L1 “deviants”, the “instantaneous” voltages that have deviated the most from the 120V nominal, be the deviation high or low. You’re still the chart on the lower right. The square in the center is where all the points should reside. [Power Quality Scatter] Given the new 1 second RMS sampling period input from @JuliaAtSense (thanks !), the detection curve for triggering a…