I notice my brother's 2024 Model Y tapers the charging amperage when above 90%. Is that normal?
IIRC my Model S seems to maintain 48 amps all the way to 100%.
IIRC my Model S seems to maintain 48 amps all the way to 100%.
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L2 Amperage Reduction Over 90%
- Thread starter TFCooper3
- Start date
GHammer
Dark Star
Seems normal to me. Both my S's and my 3 taper at the very top of charge on L2.
fiehlsport
Tire Guy
Yes, but I suspect you're way above 90% in that pic. Tap the range to set it to percent and never look back. It'll go down to 1kW around 99%, if I recall correctly.
OK thanks, guys. Looks like I remember incorrectly about my L2 charging at home!
I couldn't figure out how to edit the title after posting!That was good clickbait !.... I only opened the thread because of the nine billion percent reduction
(moderator note)
The site owners have the edit time for a thread creation set very short. This is not something a volunteer mod (which almost every mod including myself is), can change.
I did change the thread title for you though. The original title of 90000000000000% of whatever it was definitely "encouraged clicking on the thread", but looked like a mistake.
To answer the question about the charging current: As far as I know, all Teslas (and probably all BEVs) have limits on the charging current as one approaches full charge. And, interestingly, the charging currents at those high SOC (State Of Charge) are the same for both L2 and Supercharging!
Take a Supercharging M3. at a Gen 3 SC that can do 250 kW, and say that the car is at 5% SOC. One will get 250 kW until the car's at 25% or so, and then the charge rate will typically taper off linearly with increasing SOC. At 50%, it'll be around 100 kW. At 80%, it'll be around 60 kW. At 90%, it'll be around 20 kW, and, as one approaches 100%, the charge rate will drop into the single kW.
Same thing happens with L2 charging, but typical L2 for Teslas is 240VAC @ 48A, which is 11.52 kW. That will run like that to 90% - but when one gets up a bit, the rate drops off to the same numbers one sees while Supercharging, in the single kW or less as one approaches 100% SOC.
As it happens, this is all about protecting the battery.
If one is messing with NIMH batteries, Tesla strongly suggests, with good reason, keeping the day-to-day max charge to 80% or so in order to get improved battery longevity. Their words: 100% isn't forbidden, especially when leaving on a long trip, but the idea is to not sit there with 100% charge for long periods of time.
With LFP batteries, Tesla actually suggests going to 100% on a regular basis. Part of that is because the battery chemistry can handle that without much degradation; part of that is because the Battery Management System (BMS) needs to see 100% from time to time in order to get an accurate idea of how much charge is actually in the battery.
Final note: When one is going on long trips with a Tesla and hitting multiple SCs on the way, Tesla's routing software (and also A Better Route Planner's software) will strongly suggest not going to high SOCs; because of the slow-down in charging rates at high SOCs, it's better, in terms of overall trip time, to charge to a somewhat lesser SOC. Unless there's a big gap to the next SC, or the possibility of skipping an SC charge, given one's route.
Take a Supercharging M3. at a Gen 3 SC that can do 250 kW, and say that the car is at 5% SOC. One will get 250 kW until the car's at 25% or so, and then the charge rate will typically taper off linearly with increasing SOC. At 50%, it'll be around 100 kW. At 80%, it'll be around 60 kW. At 90%, it'll be around 20 kW, and, as one approaches 100%, the charge rate will drop into the single kW.
Same thing happens with L2 charging, but typical L2 for Teslas is 240VAC @ 48A, which is 11.52 kW. That will run like that to 90% - but when one gets up a bit, the rate drops off to the same numbers one sees while Supercharging, in the single kW or less as one approaches 100% SOC.
As it happens, this is all about protecting the battery.
If one is messing with NIMH batteries, Tesla strongly suggests, with good reason, keeping the day-to-day max charge to 80% or so in order to get improved battery longevity. Their words: 100% isn't forbidden, especially when leaving on a long trip, but the idea is to not sit there with 100% charge for long periods of time.
With LFP batteries, Tesla actually suggests going to 100% on a regular basis. Part of that is because the battery chemistry can handle that without much degradation; part of that is because the Battery Management System (BMS) needs to see 100% from time to time in order to get an accurate idea of how much charge is actually in the battery.
Final note: When one is going on long trips with a Tesla and hitting multiple SCs on the way, Tesla's routing software (and also A Better Route Planner's software) will strongly suggest not going to high SOCs; because of the slow-down in charging rates at high SOCs, it's better, in terms of overall trip time, to charge to a somewhat lesser SOC. Unless there's a big gap to the next SC, or the possibility of skipping an SC charge, given one's route.
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