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Simple Question. Better to Charge to 80% or 90%

Discussion in 'Model 3: Battery & Charging' started by jasonmason, May 9, 2018.

  1. jasonmason

    jasonmason Member

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    I drive about 60 miles a day. I can only charge at work. Is it better to charge to 80% daily? Does it more negatively effect the battery if I charge to 90%? Should I charge to 80% M-TH and then charge to 90% on Friday?

    Thanks in advance!
     
  2. arcus

    arcus Active Member

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    I used to charge my car to 90%, then adjusted to 80% (my daily commute is similar to yours), but it should not really matter between the two. Both the phone app and the on-screen indicator in the car let you set the value for daily (50-90%) or trip (90-100%), so as long as you keep it within the daily threshold you will be fine.
     
  3. Pkmmte

    Pkmmte Le meow

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    I always charge to 90% and have had zero degradation so far. I agree with arcus above, you should be fine as long as you keep it within the daily threshold.
     
  4. hiroshiy

    hiroshiy Supporting Member

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    Elon Musk once tweeted that 70% daily will cause lesser degradation than 80% daily, as far as I recall. But agree, the effect to degradation between 70% and 90% seems to be minimal so it's ok to use whatever percentage necessary for you.
     
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  5. Lloyd

    Lloyd Well-Known Member

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    Compromise with your indecisive self. 85% :)
     
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  6. EVSteve

    EVSteve 110% Solar Powered

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    Lmao this is what I do
     
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  7. geometro

    geometro Member

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    So, dumb question— how do you set the charge to %? I only see the slider being able to set charge to number of miles.
     
  8. evp

    evp Nerd

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    I've charged to 90% for 3.5 years and 100,000 miles. My current battery loss is about 5%.
     
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  9. RedMS

    RedMS Member

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    You have to change your display to energy in the setting > units menu
     
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  10. Asterix187

    Asterix187 Member

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    People have theirs set to mileage? Weirdos :)
     
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  11. David99

    David99 Active Member

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    It is better for battery life to only charge to 80% vs 90% but the difference in degradation will be very small.
     
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  12. arcus

    arcus Active Member

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    #12 arcus, May 10, 2018
    Last edited: May 10, 2018
    Hey, I know I am driving a computer on wheels, but now you're telling me it is a smart phone? I refuse to set it to %! :p
     
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  13. WallyP

    WallyP Member

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    I'm no tecchie by any means, so I've figured out the following way to set battery charging percentage using the Tesla (Model 3) phone app. (Trying to estimate percentage on the car interface is too difficult to figure out.)

    The battery image shows bars which are in increments of 10%. Farthest right is 100%, first from right is 90%, second is 80%, and so on.

    Is this correct?
     
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  14. SigNC

    SigNC Member

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    If you have remote S it's easy to jump around in 10% increments.
     
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  15. mtndrew1

    mtndrew1 Member

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    My understanding is that the “sweet spot” to use for least degradation is the window between 30-70%. As my daily routine almost never takes me more than 75 miles I charge nightly to 70% and bump it up via the app when I know I’ll need more range.

    That said I’m relatively certain that the difference between charging to 70% and 90% is probably not worth worrying about. If I didn’t have home charging I would always charge to 90% to ensure I had plenty of range for unexpected circumstances.
     
  16. Moderatefan

    Moderatefan Member

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  17. insaneoctane

    insaneoctane Active Member

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    I posted this on a different forum but here it is again....

    For some, they say set to 80% or even 90% and never worry about it again. That mentality probably works for leasers or people that upgrade cars often. I'm neither of those AND I happen to have a long daily commute (110 miles round-trip) . Therefore I worry about this more than the average owner. For starters, calculate your daily commute as a percentage of the 100% SOC battery range. For me, that's 35% (110 mi / 310 mi). Divide this in half, 17.5% (35% / 2). Add this to 50%. For me, 50% + 17.5% = 67.5%. So, for my daily commute, charging to 67.5% is ideal for battery longevity. Next, you apply the common sense and convenience factors. This math leaves me with 32.5% at the end of my commute for "pop ups". Everyone's lifestyle is different, some may have unpredictable things constantly. For me, having 32.5% is perfectly adequate for most pop ups and a supercharger fixes it if I'm wrong. I will round up to 70% SOC. If I know I need more mileage any particular day, I can up the SOC. Don't forget climate can significantly impact these calculations, so winter might easily drive up your SOC target. Good luck and happy charging

    FWIW, I am not following my own advice yet. I am set at 80% now. I new consideration I have noticed (but not experienced yet) is what happens if you forget to charge your car one night? Does that impact you? Does picking a number to accommodate your needs for this mistake make sense? Food for thought ...
     
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  18. David99

    David99 Active Member

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    Excellent points @insaneoctane
    That's I see it as well. I intend to keep my car for a long time. Living in a hot area like Southern California, batter degradation is already accelerated compared to more tempered states. So there is good reasons to spend a few minuted about what you can do to optimize this without loss of convenience.

    For example I use an app that let's you enter at what time i the morning you want the charge to be done. It checks the SoC, calculates how long it will take to charge to the desired level and then starts the charge process just in time so it finishes at your desired time.

    If you plug in at night when you come home and charge it will finish charging at, let's say midnight. It then sits there at the higher SoC for 7 hours before you leave at 7 am. With the app it will sit at the lower SoC for 7 hours. So every day about a third of the time the battery is at a lower SoC compared to normal which makes a significant enough difference. The good thing is the app will always finish on time no matter if you drive more or less in a day. The car's timer doesn't allow that flexibility.
     
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  19. Country Roads

    Country Roads Member

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    Having come to the S from an i3 and before that, a Volt, I love the battery size and not having to plug in every night. Such freedom. So I charge to 80% (200 miles) and then plug it back in a few days later once it's below 40% (100 miles).
    Maybe I should modify it to 70/30 - 175 miles/75 miles
    22 mile daily commute
     
  20. pace

    pace Member

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    My issue is that I live around 230 miles from my nearest super charger and my parents live around 350 miles away. In an ICE if I needed to head somewhere in a hurry I could just take off knowing I could get fuel anywhere. With the model 3, I feel like I need to have close to one SC distance away so that I can always be ready. I wouldn't want to need to leave only to have to charge at home for four hours before I could leave.

    I charge to around 260 miles each day, but would prefer 280 if I didn't think it would make a big difference.

     
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