OK - I think I have an explanation for the weird disconnect behaviors of my Sony TV and my Washing Machine smartplugs. I noticed that both of them had disappeared from Sense this evening, so I decided to look at the Kasa app to see what was going on. Here’s the “reliability” chart showing the Sony TV and Washing Machine smartplugs as disconnected.
If I look at the Sony TV, showing as disconnected, in the Kasa app, I notice a very tiny power draw, less than 0.1W, while my Apple TV, which shows as connected, is drawing well over 1W. The Washing Machine, showing as disconnected, is showing less than 1W (0.69W) on Kasa. My hypothesis is that Sense probably rounds any usage less than a threshold of 1W down to 0. And from what I have seen, Sense doesn’t do a lot to differentiate between 0 and NA. I’ll have to look for places where the Sony TV shows as connected, but with the TV off, to see if the power is above 1W at that point in time.
Sony TV on HS300
Apple TV on the same HS300 as the Sony TV
Washing Machine on HS110
I’m not sure if my theory is completely right. Sense does seem at least partially capable of delineating between zero and NA in export. If I look at the distribution of extremely low usage values coming out of my smartplugs, I do see some actual zeros, mostly coming from my Washing Machine smartplug, and a much smaller smattering from other devices.
If I look to see how the Washing Machine’s zero usage hours are distributed across a year, it looks pretty even (below) leading me to believe that there’s a fairly stable mechanism at work here - not likely a Sense or firmware update has caused a change of interpretation of of zeros…
So my next path of inquiry is going to be looking at the stream of data coming from the Washing machine smartplug to see how it varies.