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Here's the latest update, with new data for 707, 330(EU) and 670. Thanks thebabydoc and dpeilow. 707 stands out as the quickest CAC drop by mile...
Isn't Tony Stark based on him?
Every few months, maybe quarterly. Msjulie sent me an update right before so sold the car, so you've got a while. And thanks!
A few times, but not all that often. When I do, the CAC goes down. You can see the same thing in the data for other people's cars (assuming that...
I think it's supposed to display "cannot calculate range" at 10% SOC, or ~35 ideal miles. So getting it at 45 means it was only off by 10 miles,...
Only if people run the packs to very high or low states of charge and give the algorithm data. I don't think that this is happening all that...
I kind of think this is what it's doing. I suspect that it only gets useful data when it's very full or very empty. There are tons of instances...
Whatever the issue is, it's not that. The algorithm behaved very, very differently with the old cells. It showed them degrading much more...
The nav unit is third party (my car doesn't even have nav, for instance), so it's hard to imagine that it uses the GPS from the car. So probably two.
The fact that CAC jumps up a lot when you range charge is clearly due to an algorithm error. There's just no way that doing that makes the cells...
Adding one new car, #1180 (thanks Timothy) and updating #33 and #209 (thanks slcasner & msjulie!) Not a lot of good news here. #33 now holds the...
Absolutely! To collect it, put a USB jump drive with a folder called "VehicleLogs" at top level into the USB port on the Roadster (in the 2.X,...
Adding in three months' worth of data for my car (#670). The car spent maybe 7 weeks of that time out of service (mostly waiting for tie rod ends...
I found that if I adjust the mirrors correctly, I can see into the "blind spots" just fine. In fact, before I did that I also found that turning...
I've been daily driving my original Roadster for 8.5 years/almost 140K miles. It's completely fine to do, although I do cringe when my wife wants...
I have a somewhat similar thing that just started happening to my car, and I think it's wheel bearings. It's strange, something in my monkey...
It's only a little off. My new battery full range was 344, so it's now at 309/344 = 90%. In CAC space it was about 214 and now is 189.5, giving...
[ATTACH]
I just fully range charged my car. Here's the state of charge screen. Note that the AR (amp hours remaining) is 189.54, while the CAC...
The old Roadster batteries were also pretty good, although not that good. For instance, my (second) original battery lost maybe 12.5% of its...
I got these rotors around the end of 2016, and then sat on them until now for no good reason. They're light years ahead of the stock ones....
Adding 2.5 months' data to #33. Thanks, slcasner! It's had about 300 miles driven and lost 1.5 Ah, making it within 0.5 Ah of the lowest CAC in...
Adding in our 16th 3.0 Roadster, #95 (EU). I got these logs in email, I'm not sure if the owner is a forum member (though I'll be sending him a...
I'm adding #189. Sparrow sent me the logs a while ago and I managed to completely lose track of them until he reminded me. Sorry about that, and...
It has about 35 miles on it during its flat spot, and during that time the CAC is exactly the same to seven decimal places. I've seen this...
Adding five months' data to #425, thanks ecarfan. It's one of the higher mileage cars, and it's doing pretty well, all things considered. It's...
I got about 8 months' worth of data for #537 from ggr (thanks!), making it the currently oldest battery in the study. It's doing pretty well...
I'd love to see if your CAC dropped a bunch after this happened. I predict that it did. Care to send me an updated log?
My working theory is that the CAC algorithm only gets real information about the battery capacity when it's at very high or very low state of...
One thing to keep in mind about your car is that it may well be shifted right by ~70 days because of its reset. If you move your line over by...
Exactly right. #2 has only 109 miles on the 3.0 battery (and 4K miles on the car), and hasn't gotten even 0.1 miles for the last 195 days in the...
Did you include this graph that shows the three batteries in my car that I'd posted a while back? It makes that point nicely, I think. [ATTACH]
Updating with four months' new data for #209. She's put on 800 miles and lost 3 Ah of CAC, which is pretty much par for the course. Thanks,...
Go ahead and send the graph. Anything I post here is intended to be available to the general public (since it actually is). My preference with...
The site says: "Close Approach of Mars on October 6, 2020 at a distance of 0.049 AU." Which is to say that this Roadster will get nearly all the...
And just to put this in perspective: a CAC of 184 is midway between a new original battery and a new 3.0. Dave and I are pretty close to there....
I did a multivariate regression a while back, and it showed that time was a much bigger factor than usage, though both were important. So, if you...
Pretty much.
Oh, and thanks so much to thebabydoc, dpeilow, utch and simonog for supporting this project with their data!
I've been remiss in posting updates for a while, because of some personal and work issues. As a result, this update contains data for five cars:...
After range charging yesterday, I got this. I fear I may have seen the last of the 300 mile ranges. In terms of real-world range, who knows? I...
I second that. I find that because regen braking works so well that I rarely use the friction brakes much, and as a result they'll "glaze" and...
Just for reference, here's the latest update date, days on 3.0 battery and miles on 3.0 battery for each car: # Date Miles...
Updating with a couple of weeks' data for #33 (he did a long drive and had a step drop in his CAC) and mine (I ranged charged once and had a small...
I haven't, although I did do linear regressions for each of the lines here: 3.0 Battery Longevity and then a two-variable linear regression here...
I took the car in for routine service and they said that the battery failed some test, and would I mind if they kept it for a while so they could...
Adding 3 months' worth of data for #33. Thanks, Steve Casner! This is a car with lots of time but relatively little mileage. It's got about 8...
Just as another illustration, I went to the logs for my car and did a comparison of the rate of degradation for the original and 3.0 batteries....
If this is working the way I think it is, then they always knew it was an issue. It really looks to me like the car mostly can't tell what the...
It's been a while since the last update, but Dave Denhart (#181) sent me his logs, and I'd been sitting on an update from dhrivnak (#255) since...