cwerdna
Posts: 42
Joined: Tue Jan 15, 2019 10:20 am
Location: SF Bay Area

Re: Chevrolet announces update to all 2017-2019 Bolts with fast charging

Wed Jul 15, 2020 8:46 am

Charging rate is measured in kW. Energy and battery capacity are measured in kWh.


SparkE
Moderator
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Joined: Sun Sep 11, 2016 5:53 am
Location: SF Bay Area

Re: Chevrolet announces update to all 2017-2019 Bolts with fast charging

Sun Jul 19, 2020 7:19 pm

BoltEV wrote:...

But I cajoled the dealer into giving me the fast charging update.

I stopped up at the EA DCFC 350 KW fast charger up in Mojave and it was the same 50-53 KW charging when I had about 80 miles left at the start of charging. Same as before.

Of course it was not "cold weather" up their either!


There may be another difference (the behavior is this way on the 2020 Bolt) : change of the charging profile. Before the 2020 model, DCFC would "step down" the charging rate when certain points were hit. IIRC, at around 50-55 % SoC, the charge steps down very quickly from 150A (~55 kW) right down to around 105A (~38 kW). At around ?75? % SoC, the charge steps down very quickly from 105 (~38 kW) right down to around 65A (~24kW). Those numbers are from memory, so they aren't exact, but they are close. The 2020 charge profile is more of a curve. It still starts downward around 50%, but it *slowly* lowers the amps in a curve, so the kW rate slowly declines, meaning an overall faster charge. The *rate* of charge didn't increase, but the charge rate "curve" over "step" drops will not to a faster charge.

I don't know if you have an OBD reader and app for the Bolt, but you could check this out if you have one the next time you fast charge.

Now the difference is negligible if you are charging on a 100A charger, but if you use one of the newer ChargePoint 250 units, or the Electrify America 150 kW chargers, you will have full speed charging up to about 50% and can watch to see if the amps drop to 105 in a handfull of seconds or if the amp rate slowly decreases over a few minutes. One could also watch the DCFC displays with amps and/or kW and % of battery and watch the rate drop to figure out if that 2020 functionality was included in the update.

BoltEV
Posts: 311
Joined: Thu Feb 01, 2018 5:58 am

Re: Chevrolet announces update to all 2017-2019 Bolts with fast charging

Sun Jul 19, 2020 9:08 pm

SparkE wrote:...I don't know if you have an OBD reader and app for the Bolt

I don't.

After driving a Bolt EV since the day it first came off the lot of my local Chevy dealer (January 3, 2017), at this point, all I really care about is how long does it take to:

* Find a DCFC charger that is available;

* Drive to that DCFC;

* Charge to needed capacity; and

* Get back on the road to my destination.

I don't even care about relative cost at this point, as time is money, too!

I have really lost interest in the weeds at this point; especially since it seems that my days of Uber driving are behind me due to Covid-19.

BoltEV
Posts: 311
Joined: Thu Feb 01, 2018 5:58 am

Re: Chevrolet announces update to all 2017-2019 Bolts with fast charging

Sun Jul 26, 2020 3:09 am

As I started driving after the software update, I noticed my capacity was up about 7%.

Then I noticed I had no regenerative braking right out of the garage, and I realized what happened.

The software update changed most, if not all of the settings, back to factory defaults.

So I had to change my Energy setting to 93% capacity when it charges at home, so that I get regenerative braking right from the start of my drive.

I know this has been discussed before, but it is an easy thing to forget, so I repeated my experience for the benefit of others.

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