Since our high winds and storms the last couple weeks, I’ve been noticing my lights flickering a fair bit. No full-on outages, but it has been enough to briefly trigger some UPSs, although AFAICT not long enough to shut down my Enphase microinverters. Is there any way to see the measured mains volt…

@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 squ…

Labs Power Quality runs on a delay. Typically refreshing every 72hrs. Sometimes it can be a week behind and other times about 24hrs. You can see your real time voltage Settings → Sense Monitor, under signals. All of us would like the power quality graph to be real time or near real time for situat…

More on what Power Quality actually logs: [image] How Many Cycles Does Power Quality Look For? Sense Labs @JustinAtSense Sense does anyone know hown many cycles the voltage is out of range before it is logged? I am assuming like 10 cycles which is what most monitors do bu…

Glad to know I’m not the only one. Unfortunately, based on what I read in the cited post, power quality monitoring really won’t give me what I’m looking for (although in my case it is showing something concerning: my L2 voltage has dropped into the 80s and 90s several times in the past 30 days; defi…

I’m going to go back and refine Julia’s answer since you seem to be looking for very short term, nearly instantaneous variations from the norm. The 7 second rolling median measurement is for the “sustained” logging on top, on the right of the waveform (or so says the info bubble). [image] But Sen…

I took a look at the CSV data yesterday, but Numbers.app on macOS made it too hard to convert the timestamp into a real date/time value, so I gave up. Since the data was only recorded at 1-second intervals, and it had that double reporting you mentioned, I was wary of its quality and didn’t want to …

A few thoughts: That DateTime format with the Z is a fairly standard output for time series data - It’s really just UTC time with decimal seconds, though from what I have seen of Sense Power Quality CSVs, none of the timestamps includes the decimal seconds. But that may mean also mean truncation …

[image] kevin1: That DateTime format with the Z is a fairly standard output for time series data - It’s really just UTC time with decimal seconds, though from what I have seen of Sense Power Quality CSVs, none of the timestamps includes the decimal seconds. But that may mean also mean truncation…

Yeah, I’m still discovering the challenges of Numbers - I want to like it, but keep on falling back on Excel and its infinite complexity (and capability) all too frequently. Here’s a little fun - a gallery of User relative power quality issues. You are User 4 in lower right. The color represents …

In the past I’ve broken out date-time strings into components and then parsed those, but I didn’t want to go to that trouble for 1-second interval data. But that’s an interesting mapping and comparison!

Regarding @kevin1 ’s question above, the instantaneous dips/spikes are on a 1-second interval.

Can Sense measure short voltage transients?

Sense Labs

kevin1 March 4, 2023, 6:14am 3

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Can Sense measure short voltage transients?

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