Extremely hot weather and Macan 4s

[SteveInKirkland]

I live in Las Vegas area, where it gets up to 118 F during summer and there's tons of Teslas around so while it's always been a concern for me too, seems it's fine.

It seems logical that comfort and range are impacted by not adding additional window tint in 118 F. My question is "how much?"

Also, I'm deeply skeptical about charging the battery to 100% in 118 F. I wish I could measure battery degradation in my car so that I could look at this.

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[2P168S]

Batteries love hotter temperatures with respect to performance. Their internal resistance drops as temperature increases (higher efficiencies) and they can charge faster without concern for internal failures (lithium plating). So your car will charge like a champ until the cooling system can't keep up. Porsche is actually really good about thermal management and sizing cooling appropriately.

Higher temps do lead to a bit more degradation though. The recommendation to be sure to keep charge limited to 80% for daily use is a good one. On a road trip, going over 80% is not a big deal as you get back under 80% pretty quickly once you start moving again.

 

[SteveInKirkland]

Batteries love hotter temperatures with respect to performance. Their internal resistance drops as temperature increases (higher efficiencies) and they can charge faster without concern for internal failures (lithium plating). So your car will charge like a champ until the cooling system can't keep up. Porsche is actually really good about thermal management and sizing cooling appropriately.

Higher temps do lead to a bit more degradation though. The recommendation to be sure to keep charge limited to 80% for daily use is a good one. On a road trip, going over 80% is not a big deal as you get back under 80% pretty quickly once you start moving again.

My theme is that we have no measurement tools to tell us whether these theories have any basis in reality based observations.

 

[daveo4EV]

the car (BMS) is in control of all charging…you are sadly mistaken if you think as the driver/owner of the vehicle you have any say in the matter…the _ONLY_ thing you are allowed to do is plug/unplug the vehicle and adjust the target SOC…everything else is managed for you by the BMS.

ultimately the BMS (Battery Management System) "knows" right from wrong in terms of temperature/charge-rate/SOC - it's also a matter of charge rate over "time"

600 kW might be fine with no expected impact if it's only for 12 seconds at any temperature
conversely 25 kW for 30 minutes at 170F battery temp might be devastating to battery longevity and therefore should not be allowed…

the BMS main (only?) job is to manage the battery to Porsche's specs for warranty compliance - i.e. don't let anything happen to the battery that causes Porsche to be "on the hook" to replace the battery

the BMS has two tools it can deploy to achieve it's goal:

1. temperature management up/down
2. charge rate

charge rate will only be "adjusted" if temperature is not responding with enough granularity

Porsche "knows" how much temperature and charge rate can be tolerated for each fractional degree of temp vs. SOC and charge rate…

ultimately the BMS will heat/cool the battery as necessary during a charging session and simultaneously adjust the charge rate to avoid "over taxing" the battery…

the BMS also knows the history of your battery and how many kWh's in/out it's provided, SOH, SOC, and peak temps, low temps, peak charge rate and for how long those conditions were encountered - all of this will factor into what is "allowed" at any given moment in time for any charge/discharge demands on the battery…

there is nothing _YOU_ can do to the battery - it's all under software control - Porsche software that you can't change - basically if it's happen it's "OK" - because otherwise the BMS would step in and make adjustments - with it's ultimate authority to "shut it all down" if the parameters are so far out of whack that any charging at any rate would be detrimental to the battery given current conditions…

if your battery is charging the temperature is fine - and what ever rate you're getting is also fine - because if it wasn't fine the BMS would shut it all down or adjust things to settings in which it's all fine…

https://www.taycanforum.com/forum/t...my-taycan-charge-as-fast-as-i-want-it-to.779/
https://www.macanevowners.com/forum...n-owner-im-stressed-about-the-battery….17629/

 

[2P168S]

My theme is that we have no measurement tools to tell us whether these theories have any basis in reality based observations.

Source: Billions of dollars of global battery R&D and application experience in both vehicles and other applications.

There are no special "Porsche batteries". The batteries in the Macan follow the same laws of physics as the rest of the universe.

 

[2P168S]

the car (BMS) is in control of all charging…you are sadly mistaken if you think as the driver/owner of the vehicle you have any say in the matter…the _ONLY_ thing you are allowed to do is plug/unplug the vehicle and adjust the target SOC…everything else is managed for you by the BMS.

ultimately the BMS (Battery Management System) "knows" right from wrong in terms of temperature/charge-rate/SOC - it's also a matter of charge rate over "time"

600 kW might be fine with no expected impact if it's only for 12 seconds at any temperature
conversely 25 kW for 30 minutes at 170F battery temp might be devastating to battery longevity and therefore should not be allowed…

the BMS main (only?) job is to manage the battery to Porsche's specs for warranty compliance - i.e. don't let anything happen to the battery that causes Porsche to be "on the hook" to replace the battery

the BMS has two tools it can deploy to achieve it's goal:

1. temperature management up/down
2. charge rate

charge rate will only be "adjusted" if temperature is not responding with enough granularity

Porsche "knows" how much temperature and charge rate can be tolerated for each fractional degree of temp vs. SOC and charge rate…

ultimately the BMS will heat/cool the battery as necessary during a charging session and simultaneously adjust the charge rate to avoid "over taxing" the battery…

the BMS also knows the history of your battery and how many kWh's in/out it's provided, SOH, SOC, and peak temps, low temps, peak charge rate and for how long those conditions were encountered - all of this will factor into what is "allowed" at any given moment in time for any charge/discharge demands on the battery…

there is nothing _YOU_ can do to the battery - it's all under software control - Porsche software that you can't change - basically if it's happen it's "OK" - because otherwise the BMS would step in and make adjustments - with it's ultimate authority to "shut it all down" if the parameters are so far out of whack that any charging at any rate would be detrimental to the battery given current conditions…

if your battery is charging the temperature is fine - and what ever rate you're getting is also fine - because if it wasn't fine the BMS would shut it all down or adjust things to settings in which it's all fine…

https://www.taycanforum.com/forum/t...my-taycan-charge-as-fast-as-i-want-it-to.779/
https://www.macanevowners.com/forum/threads/faq-question-im-a-new-ev-macan-owner-im-stressed-about-the-battery….17629/

With the caveat that BMS best practices and particularly the algorithms used for state estimation and future state forecasting are VERY active areas of development (e.g. the BMS is not perfect), I basically agree with this.

 

[USMA81]

My experience so far this spring in Phoenix exactly mirrors SteveInKirkland’s comments, especially the comment about the A/C working well in the heat - very capable.

 

[SteveInKirkland]

Source: Billions of dollars of global battery R&D and application experience in both vehicles and other applications.

There are no special "Porsche batteries". The batteries in the Macan follow the same laws of physics as the rest of the universe.

"Our analysis also reveals a notable variation in vehicle lifespan based on manufacturer."

https://www.nature.com/articles/s41560-024-01698-1

 

[macotak01]

We hit 38c in Tucson yesterday. No related issues that I can identify, does fine in the heat so far.
Let me amend this... one item: apparently the rear camera wash fluid has been heating up and expanding and dripping from my camera on to the rear hatch.

 

[Tacoman]

Somewhat related, I just ordered a windshield sunshade for my car. It will soon get very hot in Southern California and I'm concerned about the leather dash.

I searched online and the first few vendors that I tried didn't have anything for the Macan EV yet. I eventually landed on Weathertech's site, and they had a sunshade for the car. It has a foam core and is silver on one side, black on the other (for winter use to help defrost the windshield). It hasn't shipped yet so I can't give my impressions of it, but Weathertech is known for making mostly quality products.

2018 Macan S....
Separation due to hot weather.

 

[siglo]

35 degree celsius is considered good wheather over here, that’s not extreme heat. I’ve used my taycan as my daily driver in 50 degree weather (during July & august) with no issues. This is the temperature in the shade of course, in the sun it is much higher. The battery management and pre-cool option took care of the charging, I did not have to do anything. If I remember correctly I had the maximum charge reduced to 80% on the Taycan or something like that. I liked that I could keep the AC on for 30 minutes when the car was parked in the sun especially since my Taycan was black.

As for my Macan Turbo, I am not anticipating any issues. I took delivery during winter and still did not use it during the summer.

 

[Fun TC Driving]

Does anyone here have both an ICE Macan and a EV — for thinking a sunshade for a gas Macan could have a high likelihood of fitting the EV pretty well?

 

[Tacoman]

Does anyone here have both an ICE Macan and a EV — for thinking a sunshade for a gas Macan could have a high likelihood of fitting the EV pretty well?

I do and it fits well enough to not have to buy another one ...after I sell my ice.

 

[Fun TC Driving]

That is our good current solution. Thank you Tacoman.

 

[Tacoman]

That is our good current solution. Thank you Tacoman.

You bet!

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