ejcabotaje9
Posts: 2
Joined: Tue Sep 29, 2020 1:49 am

Losing range after DC fast charging.

Tue Sep 29, 2020 2:23 am

So I've noticed whenever I use DC fast charging my miles go down fast quickly compared to when I charge from a level 1 or 2. For example I use fast charge and get 75 miles. Not even driving 2 miles I've already lost about 10 miles. After about 20 miles of drainage it stabilizes. I don't have any codes popping up or anything. It only does it after fast charging. PS I didn't use ac and not driving fast or going uphill. After about 2 miles of going 18 mph around the neighbor it drains quickly up to a certain point (about 20 miles being lost) and haven't even driven more than 10 miles. Anybody else have issues after fast charging?

Kermit
Posts: 148
Joined: Mon Feb 04, 2019 10:47 am

Re: Losing range after DC fast charging.

Tue Sep 29, 2020 12:25 pm

It may be because the cooling system is working to get the battery pack temperature and charging components back down to an optimal level.
2016 Spark EV
2017 Volt

TheLondonBroiler
Posts: 264
Joined: Tue Oct 31, 2017 6:25 am

Re: Losing range after DC fast charging.

Thu Oct 01, 2020 12:43 pm

Kermit wrote:
Tue Sep 29, 2020 12:25 pm
It may be because the cooling system is working to get the battery pack temperature and charging components back down to an optimal level.
Bingo! I had a little 1500+ mile weeklong adventure last month involving 30 some fast charges (12 in one day), and the scenario described is exactly what I encountered, especially when thermal management has to operate, which is anytime you dcfc and the battery temp gets over ~85°F (if you start a fast charge session with full charge speed, 130+ amps, meaning the battery is already 75°F, you very well may get warm enough to trigger/start the cooling system).

If the battery thermal management stops operating and you continue to drive, the GOM should reflect a more accurate range.
2015 Spark EV w/ DCFC 48,XXX miles
Purchased 1/20/18 w/ 16,5XX miles
0-40k mile efficiency avg - 5.3 mi/kwh

2019 Bolt EV w/ DCFC 66,XXX miles
Purchased 3/16/19 w/ 87 miles
Lifetime efficiency avg - 4.7 mi/kwh

ejcabotaje9
Posts: 2
Joined: Tue Sep 29, 2020 1:49 am

Re: Losing range after DC fast charging.

Thu Nov 12, 2020 12:35 am

Is it a normal thing after fast charging? Mine is always doing it after fast charging. Anyone else having this experience every fast charge? Is it a defect of some sort? Also the battery conditioning says 0% does that mean thermal management is not draining the battery? Thanks everyone!

TheLondonBroiler
Posts: 264
Joined: Tue Oct 31, 2017 6:25 am

Re: Losing range after DC fast charging.

Thu Nov 12, 2020 6:47 am

ejcabotaje9 wrote:
Thu Nov 12, 2020 12:35 am
Is it a normal thing after fast charging?
I think if you read the prior posts, you will come to the conclusion that this is normal. The only mystery is why GM/LG designed it to not classify the battery conditioning as such, after disconnecting from the DCFC.
2015 Spark EV w/ DCFC 48,XXX miles
Purchased 1/20/18 w/ 16,5XX miles
0-40k mile efficiency avg - 5.3 mi/kwh

2019 Bolt EV w/ DCFC 66,XXX miles
Purchased 3/16/19 w/ 87 miles
Lifetime efficiency avg - 4.7 mi/kwh

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