Were you charging Leaf or Bolt?
I charged my Leaf twice at EMW's CHAdeMO fast charger which can go up to
And I too noticed that after a short initial max power charge, it starts
to taper.
I had my LeafSpy Pro display the cell voltages and it is easy to see
that the reason
That the Leaf is tapering the charging by the CHAdeMO station (the
station will
Happily provide 120A all day long) is because the Leaf BMS sees a cell
The high voltage cutoff (approx. 4.12V) and will tell the CHAdeMO
station to cut back.
With the cells rising higher in SoC, the current drops to keep the cell
at or below the
High voltage cutoff.

Hope this clarifies,

-----Original Message-----
From: EV [] On Behalf Of paul dove via
Sent: Sunday, May 21, 2017 4:14 AM
To: brucedp5; Electric Vehicle Discussion List
Subject: Re: [EVDL] @50kW: Chevy Bolt charge times with a level 3

I don't know what stiffen the pack means. Sounds made up.

I did watch my car charge on a chademo charger though. I had 15 miles
range showing when it started. It said 27 minutes to charge. It started
at 100 amps. After about 8 minutes I was up to a 60% charge and it was
charging at 48 amps. It had steadily dropped as it charger. Not sure why
they do this but I suppose they don't want to overheat the cells. 

I don't believe it's necessary based on my testing of LiFePO4 but maybe
these other chemistries heat more rapidly. At any rate chademo doesn't
use consistent power to charge if they did it would be much faster. I
don't know if ccs does the same thing.

Sent from my iPhone

> On May 21, 2017, at 4:49 AM, brucedp5 via EV <>
> When people talk of performance EVs, they usually forget about 
> performance charging.
> I have always had a keen interest in quick charging even in the old 
> (90's) days of PbSO4. I had 6 chargers on-board with their output tied
in parallel.
> With all of them on I could push 22+kW into my pack (I had the fore 
> runner of a l3 charging ability).
> GM bullied Euro automakers into going their way away from using 
> CHAdeMO to using ccs combo l3 DC.
> GM's Bolt as a maximum l3 charging ability of 80kW. Where most public 
> l2 EVSE only offer 50kW.
> When you read GM's pages, they spec a 80kW time.
> I suggest you read
> ing-rate-in-2017-chevy-bolt-ev-electric-car
> and it's source
> html
> The charging rates are broken down to what a Bolt driver can expect 
> from a public 50kW l3 ccs EVSE.
> If the ambient temps are optimal, the 0 to 50% SOC will be the highest

> charging rate.
> The 50% to 80%SOC will progressively taper slower, until at the 80% 
> most eVgo L3 EVSE will shut off.
> Other ccs combo EVSE will allow you to charge at a slow rate to 100%, 
> but really at 80%SOC you really ought to move out of the l3 EVSE spot 
> and to a
> l2 EVSE spot if you feel you really need to charge to 100%SOC.
> With today's larger amount of public L3 EVSE available, the fastest 
> method is to only charge to 80%, unplug and hit the highway to the 
> next L3, charge to 80% and repeat (never charging to 100% unless you 
> had to because of the large EVSE gap). After being on the road with 
> multiple l3 charges, a slower overnight charge while you sleep will
help balance/stiffen your pack.
> Tesla drivers have shown, the best method of re-conditioning your pack

> after multiple l3 charging sessions (in their case using 
> superchargers), was to come home near 10%SOC and l2 charge overnight. 
> They reported it took a long time, but it made the pack stiffer, and
helped reset the guessometer.
> For EVLN EV-newswire posts use: 
> {}
> --
> View this message in context: 
> t-charge-times-with-a-level-3-charger-tp4686787p4686793.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
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