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Set Charge Limit

ngogas

Active Member
Sep 19, 2018
1,725
1,195
Utah
I’m just curious what everyone generally set their charge battery limit to on their model 3. I don’t commute for work much, mainly taking kids to practices in the evenings so I set mine to 70% and charge every other day. Thursday night I set it to 80% knowing the weekend is coming up since I drive more on Fridays and Saturdays. Seems to be working. I get it down to about 25-35% before I charge up most of the time.
 
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Canuck

Well-Known Member
Nov 30, 2013
6,125
5,781
South Surrey, BC

patrick40363

Active Member
Mar 25, 2014
1,285
683
Cali
I’m just curious what everyone generally set their charge battery limit to on their model 3. I don’t commute for work much, mainly taking kids to practices in the evenings so I set mine to 70% and charge every other day. Thursday night I set it to 80% knowing the weekend is coming up since I drive more on Fridays and Saturdays. Seems to be working. I get it down to about 25-35% before I charge up most of the time.
90%
 
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Canuck

Well-Known Member
Nov 30, 2013
6,125
5,781
South Surrey, BC
From the Battery University site above:

"Lower charge voltages prolong battery life and electric vehicles and satellites take advantage of this. Similar provisions could also be made for consumer devices, but these are seldom offered; planned obsolescence takes care of this."

Case 1:
75–65% SoC offers longest cycle life but delivers only 90,000 energy units (EU). Utilizes 10% of battery.
Case 2: 75–25% SoC has 3,000 cycles (to 90% capacity) and delivers 150,000 EU. Utilizes 50% of battery. (EV battery, new.)
Case 3: 85–25% SoC has 2,000 cycles. Delivers 120,000 EU. Uses 60% of battery.
Case 4: 100–25% SoC; long runtime with 75% use of battery. Has short life. (Mobile phone, drone, etc.)


Higher charge limits means more electrons to deal with which degrades the cathode. Ideally you want to cycle around 50%, so 90% is ideal if you're getting down to 10% before charging again. Unless you need 90% daily, you're better off with the 70% you are using, then bumping it up to 80% for weekends. But really, I doubt it would make much of a difference if you set it at 80% and left it there.

There's a reason 90% is at the high end of the daily driving range. It's still fine but not ideal, again unless you have a very long commute before being able to charge again.
 

israndy

Supercharger Hunter
Mar 31, 2016
5,196
6,114
Alameda, CA
I charge mine to 50% (if it needs it), that way when I am out and about and find free charging I can partake. I originally kept it topped up until I kept finding charging at the movie theater or where ever and I didn't have a use for it. So I didn't wanna take the electric car space away from someone who CAN use it, so I had to pay for parking. If I don't pay for electricity I don't have to pay for parking, nice!

50% of 310 miles means I still have 155 miles I can go in my day. If I discover I need to go farther I can always supercharge, costs the same as charging at home. There are LOTS of choices in Supercharging in a 155-mile circle from my house.

-Randy

ps. I know, PG&E doesn't charge $.26/kWh. I don't have PG&E, my power company doesn't have time-of-day rates yet, so they just credit me $15/mo for every EV VIN I have. I get that even if I never charge at home.
 
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ebmcs03

Active Member
Dec 22, 2017
2,209
1,363
So Cal
@TexasEV gotcha. :)

I assume doesn’t matter how much you charge. So long as the range is between 50-90% on a daily....

What a waste of a battery resource. Might as well install a fiat 500e battery in the Tesla.

I ran my fiat battery down to like 1% many many times and charge it to 100% every day.

After 3 years 36,000 miles. I had 0 range loss. I can still drive 85-88 miles on a full charge the day I returned the lease.
 
I also charge to 70% daily but when I went to charge 100% on the weekend I found the range to be 12% lower than 4 months ago when new. Does shallow charging mess up the balancing over the months? I've reached out to Tesla to confirm there's no issue but I can say I was surprised I had "lost" 60km even though I'm at 100% in 4 months. I did another 100% charge this morning and it's the same, a little less actually.

Thanks
 
When I got my car, the service person recommended 80% based on my limited daily commute, so that is what I have been using. The rules seem to be: the closer to 50%, the better on average, but there is very little statistical difference when you get below 70-80%. Setting it above 90% will almost certainly lower your battery life. You want to have enough charge that you can make an unexpected long trip, but otherwise lower is statistically better in the very long term. 70-90% is all good with 70-80 being a little better for long battery life.
 
I have owned my M-3 (long range) for about a month. I have kept the charging limit at 90%, this shows range 270 miles (actual range is always less due to vampire drain, driving styles.. etc.). I recharge when the range shows between 90-100 miles remaining. I remember while taking the M3 delivery, the Tesla Delivery Rep said to charge whenever the battery reaches around 20% and set the charge limit at 90%.or below.

As such, a "worse case" scenario, the battery still has a 8 year warranty. On a positive note, there will be a ton of R&D done on batteries, so our current batteries will be 'obsolete' by the end of 8 years, even the Model-3 will change (just like Iphone did in past decade).

Hence, chin up & enjoy your toy. ;-)
 
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