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Faster Tesla Supercharging - How does it actually perform?

Bo (ABRP)

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(Edits: Correct charging times for 10-50 kWh for new charge curves, which previously were too optimistic. Added charging time for BTX6 100 kWh battery.)

About a month ago, Tesla started rolling out updates to their fleet to allow for faster charging at the V2 Superchargers. These are the classic Superchargers which are everywhere, and they are still physically 145 kW maximum, serving a pair of stalls.  The new V3 Superchargers will be able to serve 250 kW, per stall, but they are not yet available - we will report on their performance once we have data. But how does the fast V2 Supercharging actually perform in reality?

Thanks to ABRP users logging in with MyTesla in ABRP, and generously sharing data with us, we are able to record charging sessions for a lot of different cars at a lot of different supercharger locations. So this is actual crowdsourced data from the real world.

Increasing the charging power on vehicles should of course be a win for the drivers, leading to shorter charging times, but in particularly this case, there are some if's-and-but's:

  • For Model S and X, this is done by just decreasing the margins; will the cars and batteries actually cope with it?
  • The V2 Superchargers can provide 145 kW max for a pair of stalls. Normally, the first car to charge in a pair would get all power it could take, and  the rest would be given to the other stall - now how would this work if the first car can actually take 145 kW? Obviously, actually getting full power would be even more dependent on Supercharger occupancy.
  • Since the Supercharger charging cables and connectors were not build to deliver 145 kW, this will make the charging power even more dependent on external factors such as temperature.

For these reasons, we have chosen to be cautious and not yet enable the faster charging curves in ABRP. We will do it as soon as we see that it works well enough in the real world.

Enough talking, let's get to actual data!

Model 3 Long Range, the BT37 battery (75 kWh)

The plot below shows charging data gathered from Model 3s in ABRP from April 1st 2019, each sample is a faint blue dot. The red curve is the present (old) charge curve in ABRP for this battery, and as we can see it is limited to about 120 kW. In charging sessions with cars with upgraded charging power, which depends on software version, and at Superchargers which support it, we see a clear cloud of charging points up around 145 kW for 10-40% SoC. The yellow curve is the fitted charging curve to this new data.
BT37.png.e67da95f48866a2e860907722471256c.png

Translating these charge curves into charging times from 10 kWh to 50 kWh in the battery (in absolute energy to make it comparable between battery sizes) we get:

  • Old 120 kW charging curve: 24 minutes 27 seconds
  • New charging curve: 21 minutes 31 and seconds

That is a pretty decent time saving! As long as there is Supercharger power available for you, of course.

Clearly, the BT37 battery and Model 3 has been designed from the beginning for higher power charging.

Model S/X100, the BTX6 battery (100 kWh)

The BTX6 battery is the old grandmaster among Tesla batteries. Except for being the clearly highest capacity battery, it could also take 120 kW longer than any other battery. However, in the plot below, we notice something when it is pushed to 145 kW - see those decreasing lines of charging dots from 145 to 120 kW? It really seems like the charging speed tapers off pretty quickly irrespective if you start at high or low SoC. The likely cause is that something in the battery or cabling gets too hot and that the cooling system is not able to keep it cool enough.  Too bad on this fine piece of battery!

BTX6.png.024211d5849ced786f07c6494421bbd8.png

Translating these charge curves into charging times from 10 kWh to 50 kWh in the battery we get:

  • Old charging curve: 22 minutes 16 seconds

The conclusion from this data is that unfortunately,  the Model S/X100 were never designed for higher power charging than 120 kW, and the increased peak power is mostly a gimmick for these cars.

Model S/X90, BTX4 Battery (90 kWh)

The first small increase in battery size from the original S85, the BTX4 90 kWh battery, has never been a real success. First of all, it's actual capacity is around 82 kWh - pretty far from 90 - and there have been signs of it degrading faster than other batteries. There has also been reports of users who have received power limitations on supercharging after a certain number of lifetime supercharges.

So, our guess would have been that it would not have received any charging power upgrade at all. However, some of the data we have show that there seems to be a small push up to 125 kW for some vehicles. If this holds, the charging times for the S/X90 would actually be slightly improved.

BTX4.png.6f71a1b5d63b0f44050ee4ab86938fcf.png

Translating these charge curves into charging times from 10 kWh to 50 kWh in the battery we get:

  • Old charging curve: 24 minutes 52 seconds
  • New charging curve: 23 minutes 18 seconds

But again, the BTX4 is a tricky battery. Let us see what more data shows.

Model S/X75, BTX5 battery (75 kWh)

The 75 kWh battery has traditionally been a bit of a slow charger (in the Tesla universe), and a charging power upgrade would be a nice addition. As can be seen in the graph below, the BTX5 actually seems to really enjoy the higher power charging, which could be expected given that the peak charging power is still below the Supercharger-as-designed 120 kW and that the car probably has the same cooling capacity as the S/X100.

BTX5.png.477b15e91574b5022fe906035e0a91ea.png

Translating these charge curves into charging times from 10 kWh to 50 kWh in the battery we get:

  • Old charging curve: 29 minutes 22 seconds 
  • New charging curve: 27 minutes 58 seconds

This is a welcome charging time improvement for the small size Model S/X battery, especially since these cars have to charge more often. And given that the car and V2 Superchargers have been designed from 120 kW from the beginning, this is likely actually going to work well. 

TL;DR

Tesla's increased charging power looks great for the Model 3 and the Model S/X75 since these car models were designed to take higher charging power. The increase for the Model S/X90 and 100 mostly looks like a gimmick to stay ahead on competition - something Tesla does pretty well anyway!

How to contribute data?

If you own a Tesla and use ABRP, please do login with MyTesla in ABRP, and check the boxes "Share data with ABRP" and even better "36h background sharing", which allows ABRP to poll your car for up to 36 hours after you have used ABRP. This helps us gather all your supercharging along a trip even if you don't use ABRP all the time. 

The MyTesla token which we get from Tesla after you log in is never stored permanently in our servers, only in your own browser. We definitively don't want to put your vehicle at any risk even if our servers get hacked.

 

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18 Comments


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Guest TheMurcian

Posted

The 10 kWh to 50 kWh charging time data is very interesting IMHO. Do you know the value for the BTX6 battery? 

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I am more interested in "real world time needed" for 10%-80% or 10kWh to 50kWh. (those blue points under the ideal charge curve)

Edited by EvanLin

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8 hours ago, Guest TheMurcian said:

The 10 kWh to 50 kWh charging time data is very interesting IMHO. Do you know the value for the BTX6 battery? 

Added, thanks!

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Guest Zoomit

Posted

Does the Model 3 data include the SR and MR batteries as well?  If not, can you publish that as well?

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Since there are many data (blue points) under the ideal charge curve, it would be great to also mark a "real world time needed" for 10%-80% or 10kWh to 50kWh.

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Guest nesrohtretep

Posted

The 85 kWh battery is pretty widespread and I for one has it, it would be great to ser data for that one too.

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Guest Dec

Posted

Should keep the scales consistent between graphs for direct comparison

 

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Why did they unlock higher charging speeds for S/X75 with the V2 Upgrade? They didnt take 120kW before and do not still. They could have had the new charge curve before as the charger is and was not at its limit?

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Guest Arto M

Posted

2019.20.1 speed up the charging again. BTX5 peaks 117kw now. You have good data from us already. 😉

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Guest Pedro Carlos

Posted

Is there any data on the older BT85 pack? There have been some spurious reports that it might have slowed down a bit with the new release and it would be interesting to see the general trend.

Thanks in advance

 

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Guest Pedro Carlos

Posted

On 6/11/2019 at 1:48 PM, logic said:

Why did they unlock higher charging speeds for S/X75 with the V2 Upgrade? They didnt take 120kW before and do not still. They could have had the new charge curve before as the charger is and was not at its limit?

Probably because the 75 is a 350V battery and consequently to get to 120kW you need more current than the 300Amps. Current is the limiting factor in chargers normally, and the Power limit is a consequence of the current limitation. With V2 the current threshold is now high enough to push the 350V battery to 120kW charging

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Guest Richard Lopes

Posted

No Numbers for 85 packs?! Tesla slowed some of them can you confirm wit your data?!

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Guest Bruno Figueiredo

Posted

Any chance we can get a graph for the BT85s too?

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Guest janne

Posted

I think these should be revised. My X75 pulls now 125kW max and at 41% it is still getting 113kW, considerably better than the graph for btx5 above.

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Guest Styvon

Posted

On 6/18/2019 at 6:58 AM, Guest Pedro Carlos said:

Is there any data on the older BT85 pack? There have been some spurious reports that it might have slowed down a bit with the new release and it would be interesting to see the general trend.

Thanks in advance

 

I can confirm... Roughly 20 min more to charge 10-90%... Pretty bad in ma case cause I use 80% of my battery every day

Better Peak power at the begining, 124kW instead of 117kW, but slow down faster after +/- 30% and 10kW less at 50%

Not very happy to be honnest...

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Guest Jim

Posted

Can we have the real-world data rolled into the app? I am confused why this hasn't been done yet...

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On 7/30/2019 at 8:01 PM, Guest Styvon said:

I can confirm... Roughly 20 min more to charge 10-90%... Pretty bad in ma case cause I use 80% of my battery every day

Better Peak power at the begining, 124kW instead of 117kW, but slow down faster after +/- 30% and 10kW less at 50%

Not very happy to be honnest...

Same for all BT85s with the newest software release (starting from 16."something?"). Would be very kind of you to post the new charge curve and also use it to calculate the route. It looks like my trips are taking longer then calculated by abetterrouteplanner.com

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On 8/3/2019 at 5:19 PM, Guest Jim said:

Can we have the real-world data rolled into the app? I am confused why this hasn't been done yet...

I think real-world data is being used, for the vehicle you select. Not for your specific car though. It seems like there is a problem now for older vehicles, as some are getting their charging speed throttled back. It would be nice if this could be corrected be changing the curves for these vehicles or maybe adding a reduction factor to the charge curve. That could be set manually by the user.

 

Bo would have excellent data on the throttling of the BT85 charge curve with the new software version. Like I said above, it would be very nice to see the new vs. the old 👍

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