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Battery Degradation with high mile usage

Posted: Fri Jun 03, 2022 7:06 pm
by danielczap

I'm a California super commuter and Im considering buying a new 2023 Chevy Bolt . My commute is 82 miles each way 164 mile round trip commute. I have access to level 2 charging at work and was gifted a level 2 charger with my solar installation.

My questions are what are best practices for battery health for preventing long term degradation and if im driving 82 miles at 3:30 AM charging my car for a few hours while I work and then driving 82 miles again at 1pm and charging again is that going to make the battery wear down faster due to the constant activity? I seen a couple videos where a few guys had 90-93% battery efficiency after 100k-125k miles. Id like to drive the car for 300k miles and was trying to understand what reasonable expectations are for the bolt batteries and what kind experiences are out there for those with higher mileage

Re: Battery Degradation with high mile usage

Posted: Sun Jun 05, 2022 6:35 pm
by BoltEV
Many horror stories are told by the first-adopters of the Nissan Leaf and its battery degradation.

GM learned much from its release of the Spark EV, the Chevy Volt and now the Chevy Bolt EV/EUV.

My opinion, FWIW, is that your plan to use two L2 chargers, is the best way to do it for battery health.

Some believe that charging to 100% every night can be harmful, but I believe that GM has that problem solved, built into their battery electronics.

I drive 200-250 miles per day, 6 days a week for Uber, capped at 93% because I still have my Michigan built battery; with my plan to get my new rebuilt battery in late July.

I L2 every night for up to 11 hours to recharge to 93% (my Clipper Creek charger is only 25 amps @ 240V from my Chevy Volt days in 2014).

Now I DCFC almost 5 nights a week during my 2nd break because having an EV, Uber gives me all the long drives that the ICE Uber Drivers reject. I rarely DCFC over 80% because I get enough to finish my night, go home and get my 9 hours sleep and the charging rate drops dramatically over 80%.

One Uber driving Bolt EV owner on the other, now has 140,000 miles on his Bolt and claims only a 6% degradation before getting his updated battery.

Re: Battery Degradation with high mile usage

Posted: Tue Jun 07, 2022 1:34 pm
by danielczap
Thanks for the response.

Another question I've had is I heard using dc fast charging a lot can lead to early degradation. Is that inaccurate? I know Tesla owners live on the supercharger network so I don't see why it would unless possibly because your going from 1-93% every day.

Re: Battery Degradation with high mile usage

Posted: Tue Jun 07, 2022 6:58 pm
by BoltEV
Stop DCFC at 80% and top off to 100% at L1 or L2 at home.

Usually I go from about 28% to 80% at DCFC, drive down some then go to 93% with L2 at home.

The lowest I have gone before L2 charging at home is 5%.

I hypermiled on the way home to keep it from going lower.