Ah - this is only my fourth day since PTO, so I could definitely still be in a “learning” phase.
I can’t experiment any more today, because the rain has stopped and the solar is now producing enough to both power the house and start recharging the Powerwalls. I’ll keep an eye on it the next time I’m in the same situation.
The percentages you see in the app are not the actual percentages of the battery. Its confusing, but 0% in our display is not 0% of the battery, and 100% of the display isnt 100% of the battery. There is a thread here somewhere that has a chart.
Anyway, with some of the recent updates, this seems to have become more visible in the app (my opinion). I use self powered mode and change my reserve percentage frequently, manually based on what the next days weather is going to be, etc (I still enjoy looking at it manually like this, over a year after installation of the powerwalls).
I have noticed that, with the latest updates, There are more instances of "I set the reserve to 30% but the battery stopped discharging at 28%". Its my guess that this reserve percentage is just becoming more visible in the app, or some formula was changed to display it.
I will see if I can find one of the threads that talks about the "checking battery via its direct web interface doesnt match app" threads and link it here if I find one.
EDIT: Here is one thread. The thread link is to the specific post from
@power.saver with the chart, but you can read the thread, this one is only 2 pages long. There are a few others around too, but the chart in this post shows the difference
The App shows a lower % than the API. It follows the formula in this chart:
teslamotorsclub.com