Stanton wrote: DaveinOlyWA wrote:
You guys up North have no idea what "warm" is: it's been in the 80's here since March! I won't see anything below 6TB again until November. That's why battery degradation isn't such a hot topic (no pun intended) up there.
Is there a difference between ambient temps in 90's and a car whose pack spends time at 105+º nearly every day?
This is something I hope to answer.
I'm sure you realize this, but all that really matters is the pack temps.
I can tell you that while we spend several months here with ambient temps in the 90's, I rarely see a pack temp >105 degrees.
However, the fact that my pack is never <90 degrees either is really the problem...and we all know that pack temps around 100 degrees does plenty of damage.
Yeah, beginning to look like Nissan made progress but maybe not in every way. My pack definitely cools off faster than my 24 kwh pack did but it heats up MUCH higher as well because it fast charges a lot quicker. Even when setting my cut off point to 40 KW, I am still leaving with 85-88% SOC. This means on my 2nd QC of the day, I am over 110º and lately that has been nearly every day. But I get the chance to cool off.
This early in the year when its warm during the day, it gets pretty cold at night. In the garage, temps are moderated quite a bit but car is still sitting in temps in the mid to low 60's. If I was really concerned, I could park it outside at night where its closer to the mid 40's.
But for you, your pack would take forever to cool off and it simply won't cool down enough. Someone mentioned that the packs have air ventilation coming from the front of the car. Wondering if determining its inlet and putting a fan on it would make a difference?
I have noticed that the 3 temp sensors are pretty spread out than they used to be. Before I had 3 with 2 fairly close to each other with the 3rd being a few degrees cooler. Yesterday, after my 2nd QC, I left LS running to see how fast the pack would cool.
This is where it got strange. In just under 2 hours of near constant driving, I lost two TBs but the top sensor only dropped 3º. BUT the middle sensor (which is normally close to the top sensor) lost 10º and the bottom sensor (which is generally 5-12 º cooler any way) was another 8º below that.