DC Fast Charging Performance - Page 5 - Chevy Bolt EV Forum
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post #41 of 48 (permalink) Old 04-27-2019, 02:02 PM
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Hi @Zoomit .
Thank you for posting these graphs. I've returned to them many times over the past year and a half.
I wondered if you would be okay with me using the data from the 100 amp DCFC tapering in a video I'm making.
I appreciate all the work it took to collect the data, create the graphs, and then share them with the community.
Thanks again, and do let me know.
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post #42 of 48 (permalink) Old 04-27-2019, 07:49 PM Thread Starter
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Sure, plan on it. I have updated graphs that include typical 30A/208V public J1772 charging as well. I won't have time to post them until tomorrow however.

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post #43 of 48 (permalink) Old 04-28-2019, 12:33 AM
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Sure, plan on it. I have updated graphs that include typical 30A/208V public J1772 charging as well. I won't have time to post them until tomorrow however.
I look forward to seeing these, especially your commentary on what's changed. I'll probably want to compare them against my general DCFC time-to-charge graphs and DCFC charging times from 15%. As I recall, my model seems to pretty closely match yours. (Mine is likely very inacurrate beyond 97% though, underestimating the time required.)
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post #44 of 48 (permalink) Old 04-28-2019, 10:18 PM Thread Starter
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Here are the updated graphs I did last May. The changes are relatively minor: added 32A/208V Level 2 charging, lowered the 60A line to 55A, added a taper at 98% to 100%. Enjoy!





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post #45 of 48 (permalink) Old 04-29-2019, 08:43 AM
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Thanks for updating. Attached is my chart for not optimal conditions, temperature dependent current limit.
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post #46 of 48 (permalink) Old 04-29-2019, 01:55 PM
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@Zoomit , If desired, you could specify the "optimal conditions" are a battery pack temperature greater than 77 deg and less than 113 deg.

And for those of us not living in year round more subtropical climates, like SoCal, you could generate the same graphs at a few pack temperatures that are lower to show the temperature / time penalty of DCFC for the rest of us. Just a thought...
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post #47 of 48 (permalink) Old 04-29-2019, 07:01 PM
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Thanks for updating. Attached is my chart for not optimal conditions, temperature dependent current limit.
Here's the same data expressed as a graph:



(as detailed in this post).
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post #48 of 48 (permalink) Old 04-29-2019, 07:05 PM
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Also, for most people temperature is only going to affect you if you're plugging in at a 150A station (e.g., Electrify America).

Finally, driving the car at freeway speeds does (slowly) warm up the battery, so it it starts out at 65 ℉, it'll be warmer when you get to the charger.

If you have an ODB-II dongle and either the EngineLink or Torque Pro apps, you can measure battery temperature and see what it is in practice.
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