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Model 3 MR Battery Degradation
- Thread starter Dan123
- Start date
AlanSubie4Life
Efficiency Obsessed Member
JohnSnowNW
Active Member
I am in Florida, so no winter here. And there shouldn''t be less capacity, there should be higher usage.
Mid-range here. I'm at 11k miles, and down to 248 miles total range. 6% off of EPA rated. Everything I've read here is that it's normal, but there was just a huge survey done by Bloomberg that shows I am an outlier.
Go to the bottom of this page for the chart. I am one of those dots at the bottom:
Bloomberg - Battery survey
This is cause for concern, and in direct conflict of all the posts here that say "it's normal"
Go to the bottom of this page for the chart. I am one of those dots at the bottom:
Bloomberg - Battery survey
This is cause for concern, and in direct conflict of all the posts here that say "it's normal"
6% isn't anywhere near the bottom of that chart. Sure, it's on the low end- as am I, at 4.5%, but it's still well within the spread of results.
Now, that's crazy low. I think they're blowing smoke; other users with results like this eventually got a message that something was wrong and had their packs replaced.
ralph142
Member
MR here, march 2019 build, 6800 miles, showing 221 at 85% so projecting out to 259 at 100%. Typically charge 60-70 range daily, once a month or so a trip runs it down to ~10% from 80-85 %.
Fantastic!
That sounds like the ideal usage for both longevity of battery and keeping BMS happy.
Bloomberg's data is self-reported. So, one has to consider that the owners are somewhat self-selecting. Stats gets the data from the car.
Stats shows about a 4.6% drop at 11k miles, for a single-motor 3, is around 33rd %ile. IE 310/325. So, a 6% drop, is a little lower than that. Just eyeballing, I'd say around 15%ile.
If you want something more accurate than eyeballing, you can buy the "BatteryCompare: for EV Cars" app for $3. Oh, there's not enough data for LEMRs.
If my battery were not giving me the range I would expect, I would try changing up your charging strategy. Change your SOC limit to something lower if it's higher, or higher if it's lower. Anecdotally, that seems to have helped some people with BMS errors. @ralph142 's charging strategy seems to be fairly conservative to minimize real battery deg, but some people believe it does lead to BMS drift.
ralph142
Member
what do you normally use daily ? If you're only running 10-20% off daily, try setting it down near 70 or so for a bit, and run it all the way down to 10% or so and then up to 100 ish. if its really just bms miscalibration, that should help, by all accounts.
I am the one in the 15% percentile of degradation after 11k miles. I normally charge to 80%, but only use about 5-10% of it in a day. So it goes under 70% maybe once a week? Maybe I should try charging to a lower max %, like 70%? My only issue with this is that Tesla themselves say to charge to 90%.
Letting it run down to ~20% will not hurt anything, and it may help your BMS. I would certainly try that. (Incidentally, I've heard that letting it always sit at 80% is about the worst thing you could do for the BMS.)
If you only use 5-10% daily, I'd set the SOC to 60% normally, and occasionally drive it down to 20%, and occasionally charge up to 90%.
What Tesla says isn't necessarily gospel. It's just whatever they can reasonably train their employees and what applies generically to the largest percent of customers.
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