Fast Charging and Battery Health

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brulaz

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Everyone says level 3 charging is hard on the battery.
But 90% of our driving is long range and will require 75-125A DC charging to get where we want to go within a reasonable time.

What sort of degradation can we expect per mile/km ? Any data/ studies out there?
 
brulaz said:
Everyone says level 3 charging is hard on the battery.
But 90% of our driving is long range and will require 75-125A DC charging to get where we want to go within a reasonable time.

What sort of degradation can we expect per mile/km ? Any data/ studies out there?
Click to expand...

Depends on the battery. What kind of car do you have?
 
brulaz said:
Everyone says level 3 charging is hard on the battery.
Click to expand...
It is between the battery management system and battery. As more time and miles are accumulated, Tesla tweaks their software to preserve battery life and when possible, speed the charge rate. For example:
  • 2019 - maximum charge rate was 100 kW before taper down
  • 2021 - saw 160 kW peak charge rate that soon tapered down
  • all years - knowing the destination was a SuperCharger, the car preconditions the battery temperature
Bob Wilson
 
Hopefully any BEV with good temperature control should be able to fast charge without TOO much battery degradation.

Maybe the simplest approach is to use a worst case scenario informed by the battery warranty. IOW assume 30% degradation after 8 years for Tesla.
 
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Stuff all difference compared to level 1 or level 2 charging.

I purchased a used nissan leaf with 100,000km on the clock that had been DC fast charged 99% of it's life. Battery state of health was on par with with leafs of the same age that had never been fast charged.
 
gooki said:
Stuff all difference compared to level 1 or level 2 charging.

I purchased a used nissan leaf with 100,000km on the clock that had been DC fast charged 99% of it's life. Battery state of health was on par with with leafs of the same age that had never been fast charged.
Click to expand...
Fascinating as Spok would say on Star Trek. What year is the Leaf and what is the battery SOH. "On par" doesn't tell us. As a 2018 40kwh Leaf owner at almost 50,000km I am very interested in knowing. thanks
 
2014, 10 bars 78% SOH, and over 1,000 DC fast charging sessions.

My theory on what kills batteries is:
1. Sitting at 0% for long periods of time.
2. Sitting at 100% for long periods of time.
3. Excessive heat.

If you can avoid all of these then even the lowly Nissan leaf will give you many many years of zero emissions driving.
 
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