Terrific Charging Session: 283 kW charging yesterday

[USMA81]

Got 283 kW charging yesterday @32% and still delivering 144 @ 72%. Yet, the battery temp got to 133 F. Asking AI, I found that degradation is accelerated when the temp is that high. Fortunately I don’t use fast chargers that often. In the future, I will monitor the temp more closely.

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[fubar.droid]

I only used a DCFC once just to give it a try and I noticed my battery temp increase to over 100F. I was under the impression that the cooling system would keep the battery within the ] always but it doesn't seem to be the case.

 

[craz8]

Once again, the AI is incorrect, as it always is.

Keeping it at high temps for a long time is probably bad, but the cooling on this car is great at dropping that quickly once charging stops.

Keeping the car at high charge isn't great either.

But charging creates heat, and these batteries can do up to 55C for short periods to allow for fast charging. All fast charging cars do this

 

[USMA81]

Thx. The temperature dropped quickly after disconnecting. It was back down to 110 in a few minutes. Also, the charge session started with the temp elevated above the optimal range.

 

[PrudentOcean]

I only used a DCFC once just to give it a try and I noticed my battery temp increase to over 100F. I was under the impression that the cooling system would keep the battery within the ] always but it doesn't seem to be the case.

The bracketed temperature is merely the optimum charging temperature range. The car won’t cool the battery unless it is getting too hot.

 

[daveo4EV]

Got 283 kW charging yesterday @32% and still delivering 144 @ 72%. Yet, the battery temp got to 133 F. Asking AI, I found that degradation is accelerated when the temp is that high. Fortunately I don’t use fast chargers that often. In the future, I will monitor the temp more closely.

don't sweat the battery temp - there is nothing _YOU_ can do to the battery - and Porsche's BMS (Battery Management System) wouldn't allow temp or charge rate to happen if it was an actual problem…

https://www.macanevowners.com/forum...n-owner-im-stressed-about-the-battery….17629/

 

[USMA81]

Actually, there is something I could have done. The fast charge session I did was optional. After using the Macan and arriving home at 19% SOC, I went to a nearby EA station and did the charge above. I alternatively could have (1) done level 2 charging at home, or (2) charged on the EA station to a lower level than 80%, say, 50% (the highest temps occurred at the higher SOC in the session).

Many technical websites indicate that high temps and high SOC’s do degrade the battery at a an accelerated rate vs level 2 charging. Yet that faster rate of degradation still might not affect range meaningfully over the next decade, especially if most of the charging is at lower temps or on level 2, as in my case. I’m not worried about degradation and I will use the vehicle‘s capabilities fully, but at the same time I want to minimize impact where I can.

 

[RunningOnSolar]

Actually, there is something I could have done. The fast charge session I did was optional. After using the Macan and arriving home at 19% SOC, I went to a nearby EA station and did the charge above. I alternatively could have (1) done level 2 charging at home, or (2) charged on the EA station to a lower level than 80%, say, 50% (the highest temps occurred at the higher SOC in the session).

Many technical websites indicate that high temps and high SOC’s do degrade the battery at a an accelerated rate vs level 2 charging. Yet that faster rate of degradation still might not affect range meaningfully over the next decade, especially if most of the charging is at lower temps or on level 2, as in my case. I’m not worried about degradation and I will use the vehicle‘s capabilities fully, but at the same time I want to minimize impact where I can.

Thanks for this very useful post. I had a similar experience with fast charging at a Ford charging station with over 120 battery temperature and trusted the car with some reservation.

Many of us primarily charge at level 2. So an occasional high temp charge is probably not a major issue. I generally keep the charging max percent at 80 for additional battery life.

I’ve seen Kyle Connor and other YouTube influencers advocate for 60 percent storage percentage. However, advocating such practices fuels arguments about EV ownership being a nuisance.

 

[iPadOnWheels]

AI is just hashing up what it finds on the internet. In this case I would trust the engineers at Porsche.

And here's my favorite quote regarding AI from Jerry:

"We’re smart enough to invent AI, dumb enough to need it, and so stupid we can’t figure out if we did the right thing."

 

[fubar.droid]

don't sweat the battery temp - there is nothing _YOU_ can do to the battery - and Porsche's BMS (Battery Management System) wouldn't allow temp or charge rate to happen if it was an actual problem…

https://www.macanevowners.com/forum/threads/faq-question-im-a-new-ev-macan-owner-im-stressed-about-the-battery….17629/

Hmm I don't know 130 F is extremely high. I would be scared to sit in the car with that kind of temperature even if it's supposedly safe.

 

[daveo4EV]

Hmm I don't know 130 F is extremely high. I would be scared to sit in the car with that kind of temperature even if it's supposedly safe.

it's not - fluids in ICE motors routinely run 200F-240F

well within nominal limits for a LiON battery.

 

[PrudentOcean]

Though admittedly there is a big difference between those temperatures in an ICE motor and a battery. 140 degrees Fahrenheit is where temperatures become dangerous for lithium ion batteries.

 

[SergeyIndy]

No point and no benefit of charging that silly fast.

This high temp of battery while supported is not good and increases the risk of failure of all systems. I always set Battery Friendly to ON for much smoother charging curve and lower battery temp -- just me.

Let me give you an example, when I tried this once (never again) on a Taycan, I felt the fans will come off and fly out of the front. Anyone wants to deal with replacing fans or wait a few more minutes in Battery Friendly ON mode. My test showed no time advantage when charging in one vs. the other mode to 80% SoC, so compare it for yourself.

For home charging, I know that Macan EV in the US does not pull 11kW (48Amp). However, if you have time to charge at home, same rule applies, make it slower, since even the 9.6kW (40Amp) charging creates excessive heat in the cable and more losses. I set my EVSE to 30Amp when I am not in a hurry which is 99% of the time.

 

[USMA81]

AI is just hashing up what it finds on the internet. In this case I would trust the engineers at Porsche.

Yes, the AI engine is just reporting back what it finds on the internet. In this case, it found several, high quality studies that showed an increase in degradation at temps above 50 C / 122 F, especially at high SOC. Anyone here can do the search to see the studies. I’m not worried; my original comment was just an observation I had while charging.

 

[fubar.droid]

No point and no benefit of charging that silly fast.

This high temp of battery while supported is not good and increases the risk of failure of all systems. I always set Battery Friendly to ON for much smoother charging curve and lower battery temp -- just me.

Let me give you an example, when I tried this once (never again) on a Taycan, I felt the fans will come off and fly out of the front. Anyone wants to deal with replacing fans or wait a few more minutes in Battery Friendly ON mode. My test showed no time advantage when charging in one vs. the other mode to 80% SoC, so compare it for yourself.

For home charging, I know that Macan EV in the US does not pull 11kW (48Amp). However, if you have time to charge at home, same rule applies, make it slower, since even the 9.6kW (40Amp) charging creates excessive heat in the cable and more losses. I set my EVSE to 30Amp when I am not in a hurry which is 99% of the time.

Higher amperage results in less loss - not more - but 48, 40, 32A, really makes little difference. My battery temp barely goes up when I charge at the 9.2-9.3 kW rate that it's running at.

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