Thanks for the replies. Clearly some knowledgeable people on here. So basically I won’t bother running sentry at home. We’ve had quite a few car break ins around me but not a big deal.
If it's just for break-ins, honestly,
most cases the footage wouldn't help you anyway. The cameras are angled and scoped for detecting road features, not faces. Plus they usually make no difference in most places,
very few people get caught due to the videos.
I’m probably wrong but I thought it was calibration readings in lower charge states is what most batteries are lacking?
So, this is where the forum format hurts us. The stickied thread referenced had a lot of good discussion, but the main post (and many follow-ups to it) is exemplary of "correlation does not equal causation". I honestly think the first post in that sticky should be edited to reflect the later findings and understandings of the thread, but I digress. This is why in
this thread here, I've been putting quotes around "calibration" and otherwise avoiding the more complicated subject.
The stated thing to "get more range" is to gather open circuit voltage readings at various states of charge. The OP couldn't get open-circuit readings with their previous habits because they used Sentry heavily. They stopped using Sentry as much
and started letting the car rest at various points. It took months for their range recovery to occur.
Their recovery of range could've been much faster if they focused on what was
probably the actual cause in their case: battery pack balancing. I hate bringing this up because
it's not a problem for most people. But in
these particular cases with very heavy Sentry usage (or anything else keeping the car awake 24/7), yes, the battery pack loses balance because the Model 3/Y is thought to balance the pack only when sleeping. That is, only when it is
open-circuit. See the correlation?
Balancing is thought to start above 73% when the car is asleep (and I'm slowly gathering data and cases that confirm this - previously people have suggested 90%, which is
not necessary). This is why I mentioned it took them months - it could've been merely weeks if they had just done your routine of charging to somewhere around 80-90% every day. Indeed, I have some anecdotes from others that have PM'd me (this is where my not-me data is coming from these days) where the recovery is on the order of days to weeks, not months, but
does require the car to be charged up and sitting.
So. In my above posts, replace the quoted "calibration" with "balancing",
that's what is actually happening to most people seeing a benefit from using Sentry less. Not this complicated multiple-OCV-reading thing.
I could be wrong but I and others know the BMS to be pretty dang accurate. The BMS accounts for things we often do not fully understand; recoverable capacity due to correctable pack imbalance is one of those things. It's not that the BMS is wrong and needs calibration - it is very correct and needs time and rest to perform balancing.
You normally don't need to account for this, but poorly thought-out flashy features like Sentry Mode make us need to have these discussions.
Receiving the Model Y a few weeks ago, I'm also looking heavily into these threads. This got me thinking, I wonder if the vehicle will obtain the open circuit that it needs when the car is plugged in and not charging? If so, then the scheduled charging will be the best way for the reading to be taken at a low state of charge, then 4 to 5 hours later, have car charge using scheduled charging. This way, the system will get the low SOC reading as needed and still be charged in the morning when needed.
Yes, being plugged in and not charging, it will also sleep appropriately. But see the other part of this post re: you probably don't need to let it rest at low SoC, just high.
