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Charge limit to 80% vs 90%. Will 90% significantly degard battery capacity?
- Thread starter coolmanfever
- Start date
dhrivnak
Active Member
I have been charging to 90% for over 2 years and 42,000 miles. A 90% charge this morning was 282 or 3 more than when I first got the car.
jrweiss98020
Tessa's Tesla
A little sneaky because they also changed the rated range on your car from the time you got it until now
I've been charging to 90% for almost two years and around 35,000 miles. A 90% charge is now 258 miles, or like 30 less than when I got the car. Last summer I was seeing around 275 at 90% and was relatively happy... silly me.
Many people mistake a lower range indication for battery degradation. It can be attributed to loss of battery capacity, but it may also be a sign the Battery Management System needs a better calibration or the battery bricks are out of balance.
If these are new concepts for you, here’s a little more detail explaining the cause and remedy to restore your range indication.
Tesla Official Statement on Range
If these are new concepts for you, here’s a little more detail explaining the cause and remedy to restore your range indication.
Tesla Official Statement on Range
The biggest factor in battery degradation is the Tesla Battery Lottery. Many of us have babysitted our batteries and they have degraded 7~10% in less than 10K miles just because.
Tam
Well-Known Member
I've been through 3 different Tesla models since 2012 for the past 8 years and I have put them at 90% nightly unless I need to go for a road trip then 100%.
I sold my 2012 Model S 85 in 2018 at almost 100,000 miles after 6 years and got 252.54 miles out of 285 specified fully-charged miles or a loss of 32.46 miles or 11.39%.
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dhrivnak
Active Member
Yes in theory. And at one point I think they took most of it away.A little sneaky because they also changed the rated range on your car from the time you got it until now
XLR82XS
D M C
Where is the data that supports that it was real degradation and not BMS calibration error or brick balance? I babied my battery last summer and saw the range show a 10% loss. It’s now at 5% after some deep cycles and higher charging.
AtomicNucleus
Member
The lower you go down in SOC the smaller the affect on battery health e.g. the difference between 90% and 80% in terms of battery health is greater than the difference between 60% and 70%. I think it is worth it for you to charge below 90% (try 85%) if you keep your car for at least 4 years.
If you trust Elon, he recommends 80% vs. 90% when discussing health: https://twitter.com/elonmusk/status/448466037441179649?lang=en
Note that his other statements (like "90% to 95% is fine") are responses to different questions, like getting the maximum range on a daily basis.
If you trust "battery people", they will also recommend lower SoC where practical (but probably above 60%).
If you trust many "Tesla people", 90% vs 80% doesn't matter and you should just live your life (though there's a lot less data on this specifically).
Going forward my rule will basically be 90% in Winter (because I use more energy), 80% in Summer, and maybe 90% in times I remember to give myself a bit more charge before doing a round trip that's semi-local.
Note that his other statements (like "90% to 95% is fine") are responses to different questions, like getting the maximum range on a daily basis.
If you trust "battery people", they will also recommend lower SoC where practical (but probably above 60%).
If you trust many "Tesla people", 90% vs 80% doesn't matter and you should just live your life (though there's a lot less data on this specifically).
Going forward my rule will basically be 90% in Winter (because I use more energy), 80% in Summer, and maybe 90% in times I remember to give myself a bit more charge before doing a round trip that's semi-local.
omgwtfbyobbq
Active Member
The lower you go the better. Tesla says it themselves.
https://iaspub.epa.gov/otaqpub/display_file.jsp?docid=49402&flag=1
Having said that, you'll likely see the greatest benefit on the top as opposed to on the bottom. So going from 90% to 80% will be more beneficial than going from 60% to 50%.
Tesla said:
https://iaspub.epa.gov/otaqpub/display_file.jsp?docid=49402&flag=1
Having said that, you'll likely see the greatest benefit on the top as opposed to on the bottom. So going from 90% to 80% will be more beneficial than going from 60% to 50%.
To help clarify, that comment by Tesla was explicitly about pack storage and is applicable to car storage.
For normal charging habits, Tesla says, "Whenever possible, don’t let the battery go above 90% or below 20%."
Range Tips
omgwtfbyobbq
Active Member
Something else to consider is that pack degradation as a function of state of charge (SoC) tends to show up much later in life.
There will likely be minimal differences in capacity/lifespan between a battery charged to 60% and a battery charged to 90% up until there isn't, at which point the pack charged to a higher SoC will degrade significantly and the pack charged to a lower SoC will continue to see modest degradation for a longer period of time.
https://www.nrel.gov/docs/fy13osti/58550.pdf (page 7)
At this point where don't know where that difference is. Odds are it's north of 200k miles like it is with the S/X, but we don't have enough data yet to say for certain.
There will likely be minimal differences in capacity/lifespan between a battery charged to 60% and a battery charged to 90% up until there isn't, at which point the pack charged to a higher SoC will degrade significantly and the pack charged to a lower SoC will continue to see modest degradation for a longer period of time.
https://www.nrel.gov/docs/fy13osti/58550.pdf (page 7)
At this point where don't know where that difference is. Odds are it's north of 200k miles like it is with the S/X, but we don't have enough data yet to say for certain.
Ciaopec
Active Member
What kind of "peace of mind"? Do you use 80% on your daily drives? Chargers around to use in an overextended pinch? You have been a member since 12/19. Don't know how long you have had the car but you must have some sense of the energy you need for your daily needs. Adjust accordingly. And have a backup plan.
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