This thread has providing some useful information about charging, but I am still left uncertain about the amount of time needed to charge the Chevy Bolt at a level 3 station. I am considering getting a Bolt but before I do I need to have some (average) idea as to how long it will take. I realize that will vary with the temperature and initial state of charge, but some rough average time would be useful.
So, to go from 10% to 80% charge, are we looking at, say, 90 minutes, or 2 hours, or what? Thanks, On Sun, May 21, 2017 at 5:35 PM, Cor van de Water via EV <[email protected]> wrote: > Paul, > Maybe they confused "balanced" and "stiffened"? I don't know as I did > not read the Tesla driver's experience as there was no link provided. > As far as I know, the Tesla has ~24V modules (blades) with 6 series > connected herds of round cells (approx 6-7 dozen in parallel) and the > BMS only has access to each interconnect point between the cells, so 7 > points in each module. > I do not know when the BMS is balancing, so if this only happens during > charging then I can see that a continuous cycle of 1/2 hour fast charges > may not provide enough balancing time to keep all cells properly > balanced, while a slow overnight charge may provide ample time and thus > make all cells behave more in line so there are fewer outliers, which > might resemble a stiffer pack (but it not actually stiffer as the > operation of the cells is not affected, so they sag exactly as much as > before the balancing - only with less variation between cells! > > The Leaf's BMS is powered 24/7 so it balances at all times, which is > also needed since the balancing current is extremely low (10mA) > So for the Leaf it makes no difference if you do a fast or slow charge, > the BMS has exactly as much time to balance (24 hours each day). > > Hope this clarifies, > Cor. > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of paul dove via > EV > 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 > charger > > 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 <[email protected]> > wrote: > > > > 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 > > > > http://www.greencarreports.com/news/1109714_more-details-on-fast-charg > > ing-rate-in-2017-chevy-bolt-ev-electric-car > > > > and it's source > > > > https://bro05.blogspot.ca/2017/03/fast-charging-experiences-with-bolt. > > 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: > > http://evdl.org/evln/ > > > > > > {brucedp.neocities.org} > > > > -- > > View this message in context: > > http://electric-vehicle-discussion-list.413529.n4.nabble.com/Chevy-Bol > > t-charge-times-with-a-level-3-charger-tp4686787p4686793.html > > Sent from the Electric Vehicle Discussion List mailing list archive at > Nabble.com. > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag > > > racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag > racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/ > group/NEDRA) > > -- Larry Gales -------------- next part -------------- An HTML attachment was scrubbed... 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