GRA
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Tue Sep 04, 2018 12:43 pm

GetOffYourGas wrote:
DaveinOlyWA wrote:
GetOffYourGas wrote:
Definitely not an anomaly. KeiJidosha's graphs are correct. You ideally don't want to quick-charge a Bolt above 55% unless you really need it. Unfortunately, with today's QC spacing, you often really need it.


Well that is becoming less and less true. CCS was late out of the gate but they are coming on pretty fast now. EA's 4-1 or more ratio will see to that. Right now, there is a some incompatibilities that needs to be addressed but charging just to 55% should be more than enough to station hop very soon if not now.


Assuming you let the battery run down to a reserve of 15%, that's only 40% to play with. 40% of 60kWh is 24kWh, which will safely get you about 70-90 miles on the highway, depending on weather conditions. That's certainly doable today on major corridors, like I-95 from DC to Boston. But on the lesser traveled routes (but still important), it's not enough until EA finishes their first round at least.

Then there's the soon-to-arrive competition, with both the Kona and Niro supporting 100kW max. charging on a slightly bigger battery than the Bolt, with a much later taper. Chevy will need to up their game to compete, especially as the Koreans will likely have the same or lower MSRP and won't be losing the fed. credit anytime soon.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

GRA
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Tue Sep 04, 2018 3:46 pm

Via IEVS:
Video Overview: 2019 Chevy Bolt Gives Drivers More Control
https://insideevs.com/2019-chevy-bolt-gets-welcome-software-updates/

More options for max. SoC:
. . . Previously, the Chevy Bolt provided an option for Hilltop Reserve. This setting would charge the vehicle to just under 90%. Officially this was intended to be used to gain energy while descending from a home or charging location from a high elevation.

Of course, for everyone else, there were still benefits. A 100% charge initially limits regenerative braking. Hilltop Reserve provides access to 1 pedal driving at the start of each day. It is also generally considered a good practice to keep a lithium-ion battery charged between 20% and 80%.

Now the Bolt EV will let you choose your own maximum target charge. When demonstrated in the video, the user can choose anywhere between a 40% and 100% state of charge.

The other user convenience feature is separating the heat and A/C controls. Previously, the climate would automatically switch between heat and A/C depending on the exterior and interior temperatures. This generally works well, although it can sometimes be troublesome. If the temperature drastically changes during the day, the heater could come on unintentionally for instance. . . .
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

cwerdna
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Sun Sep 09, 2018 8:42 pm

^^^
Thanks for that! You beat me to the punch.

I wonder if anyone at Nissan is taking notice. At the Phoenix town hall in Jan 2013 (viewtopic.php?t=11057) which I watched the entire video of, someone stood up and asked Nissan to provide choices like that so that hot climate Leaf drivers could help Nissan.

Instead, Nissan went backwards and took away the charge to 80% choice starting w/US model year 2014 and has provided no choices since then. :(

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DaveinOlyWA
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Mon Sep 10, 2018 6:13 am

cwerdna wrote:^^^
Thanks for that! You beat me to the punch.

I wonder if anyone at Nissan is taking notice. At the Phoenix town hall in Jan 2013 (viewtopic.php?t=11057) which I watched the entire video of, someone stood up and asked Nissan to provide choices like that so that hot climate Leaf drivers could help Nissan.

Instead, Nissan went backwards and took away the charge to 80% choice starting w/US model year 2014 and has provided no choices since then. :(


+1. I also feel that 90% is not a good option in more extreme climates especially when many Bolters are only charging a few times a week.

Should charge every day and the ability to set the SOC limit to a level that allows that for shorter commuting needs is something all EVs should have.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 8743 miles, 485 GIDs, 37.6 kwh 111.39 Ahr , SOH 96.49, Hx 114.98
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GRA
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Mon Sep 10, 2018 5:28 pm

DaveinOlyWA wrote: +1. I also feel that 90% is not a good option in more extreme climates especially when many Bolters are only charging a few times a week.

Should charge every day and the ability to set the SOC limit to a level that allows that for shorter commuting needs is something all EVs should have.

Until such time as battery tech has eliminated this issue.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

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RegGuheert
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Mon Sep 10, 2018 7:04 pm

GRA wrote:Until such time as battery tech has eliminated this issue.
Agreed. Unfortunately batteries are rarely, if ever, tested for calendar life characteristics by the manufacturers. Instead, cycle life gets tested, which inherently limits the percent of time at a high SOC to a somewhat small fraction.

Plus, as battery life improves, testing calendar life gets even more difficult. (Dr. Jeff Dahn seems to have a good solution for testing cycle life very quickly.)
RegGuheert
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SageBrush
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Tue Sep 11, 2018 12:36 am

GRA wrote:Then there's the soon-to-arrive competition, with both the Kona and Niro supporting 100kW max. charging on a slightly bigger battery than the Bolt, with a much later taper.

Not even close to being correct. Watch the Bjorn Nyland video
I don't understand why, but CCS requires liquid cooled cables for > 200 Amps. 100 kW is ~ 275 Amps

https://youtu.be/pRGgOdjXWOY
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GetOffYourGas
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Tue Sep 11, 2018 4:38 am

Wow, that taper looks very familiar. Yes, they are higher charge rates, but similar taper points, with sudden aggressive cuts to the power. I wonder why they are doing that rather than a smoother taper like Tesla does.
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GRA
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Re: Chevrolet Bolt - 60 kWh, 238 mi, < 7s 0-60

Tue Sep 11, 2018 4:18 pm

SageBrush wrote:
GRA wrote:Then there's the soon-to-arrive competition, with both the Kona and Niro supporting 100kW max. charging on a slightly bigger battery than the Bolt, with a much later taper.

Not even close to being correct. Watch the Bjorn Nyland video
I don't understand why, but CCS requires liquid cooled cables for > 200 Amps. 100 kW is ~ 275 Amps

https://youtu.be/pRGgOdjXWOY

Thanks for that. I stand corrected. It will be interesting to see if the taper points change when charged by a QC that can provide 100kW.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

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