In the first post I said "projected." In the second post, someone pointed out this is the same as "estimate." Yes, I too have never had a problem until very recently. In this post users are indicating that premature stopping has happened:
I charged my car yesterday at a SC for approx. 20 minutes, didn't even get to my 90% charge and yet received a notice of a "waived" idle fee despite not even fully charging. Has anyone had this happen to them, is this just a one-off error on their part? I went from 200 to 240 miles, far short of...
teslamotorsclub.com
also,
I wonder if Lubbock’s reluctance to embrace EVs is because it is very near the heart of the gas and oil areas around the Permian basin. Also, you can earn a degree in Petroleum Engineering at Tech. Well, that and that area is heavy in the agriculture and oil industry so everyone, has trucks...
teslamotorsclub.com
But it makes sense that people haven't heard of this—yet. Complaints of Tesla idle fee errors are mostly very recent as in the last few months. I've been driving my car since 2017 with no idle fees until the last few months—waived because they were errors.
As far as simultaneous charging and idle fees in one session, there is a cause I can explain, but it still should not have happened. I hooked up to the charger then noticed that I needed to improve my parking, so I disconnected and then moved my car a little in the same space. I then reconnected and started the charging again. While not the greatest thing to do I suppose, the supercharger shouldn't have racked up 39 minutes of idle fees while also charging my car at the same time.