Hi Willie,
When I was studying the battery technology about 10 years ago, the
assumption was that fast DC charging would only go up to 80% SoC. Above
that, you had to reduce power going into the battery significantly in
order to avoid damage. Having talked to several power engineers at my
current company, this has not changed. If you watch your power
consumption over time, you'll be able to see this ramping. Oh,
something else Tesla does is use air conditioning to keep the batteries
cool. Lots of times I'll walk past a row of charging Teslas and hear
their aircon running.
Tesla does appear to understand their technology, and takes good care to
keep it working. Can't say the same for other manufacturers...although
I'd be very happy to be corrected.
Cheers, Peter
On 3/17/20 4:43 PM, Willie via EV wrote:
On 3/17/20 6:28 PM, Neal, Gary via EV wrote:
I've thought about this while supercharging my Tesla. There are
situations where I would be ok using a supercharger a little slower
than full bore with the goal of reducing battery damage. For
example, if we wanted to have a leisurely meal while charging. I
know that occupies a supercharger longer, but it also doesn't damage
the battery as much. Right now, there doesn't seem to be a method to
reduce Tesla supercharging speed, right?
You can slow the battery charge a bit by running your climate. Open
windows and run heat full on. It's not worth the trouble. With
Teslas, SuperCharging is just not a significant issue. Tesla has said
so and those Tesloop cars went hundreds of thousands of miles charging
nearly solely on SuperChargers.
It seems Tesla does a good job of preserving the batteries in the face
of what might be termed "abuse". Though I use SuperChargers only on
trips. My 2013 S has 133k miles and has seen a steady decline of
SuperCharge power. Down from ~120kw to around 80kw now. My 2018 3
with only 30+k miles still charges at up to 140kw where available;
I've never encountered a working 250kw SuperCharger, only 120kw and
150kw. Neither car has alarming capacity reduction.
I work on the assumption that battery damage is proportional to the
time spent at 100% charge level. When I feel I might need a 100%
charge, I top off within an hour of departure. I have seen people set
up a 100% charge the night before departure, leaving the car at 100%
for as long as ~8 hours.
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