Bolt charging capacities - Chevy Bolt EV Forum
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post #1 of 5 (permalink) Old 06-10-2019, 12:22 PM Thread Starter
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Bolt charging capacities

What is the max kW charging rate for the Bolt on DC Fast charge? Can the rate be adjusted upwards?
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post #2 of 5 (permalink) Old 06-10-2019, 12:25 PM
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Originally Posted by wosborn View Post
What is the max kW charging rate for the Bolt on DC Fast charge? Can the rate be adjusted upwards?
I believe 55-56 kW (@150 amps) is the max DCFC rate of the Bolt currently. Definitely under 60 kW though.

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post #3 of 5 (permalink) Old 06-10-2019, 12:45 PM
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AFAIK, the max charge rate is software controlled. You'd have to hack the software or Chevy would have to update it in order to increase max charge rate. I don't know if other systems (battery cooling?) would be affected.
Edit: Max charge rate is in effect up to 55% or so of SOC. Then it drops to around 35kW until SOC reaches around 68%, then it drops to 25 (?) until SOC reaches 80% (?), then it drops again....

Last edited by The Other Tom; 06-10-2019 at 12:48 PM.
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post #4 of 5 (permalink) Old 06-14-2019, 02:31 AM
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I'll echo the "roughly 55kW" comment with the thread and the graph I posted about a month ago:
https://www.chevybolt.org/forum/82-c...00kw-dcfc.html


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post #5 of 5 (permalink) Old 06-14-2019, 02:42 PM
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I believe that the max charge rate is limited to a maximum of 150 Amps through the CCS connector. That is why the charge power goes up as the battery voltage increases all while the current stays constant. The max current will always be the lower value of either the connector limit, the charger limit, or the BMS requested current limit when it tapers. As was already mentioned, the BMS starts tapering around 56% SOC indicated. I'm sure software hacks could mess with the charge rate limit, probably with terrible consequences to the hardware!

ps The BMS tapers by specifying current not power. The charge voltage is whatever the battery voltage is plus whatever is needed to push the current up to the target.

Last edited by JPT; 06-14-2019 at 02:45 PM.
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