Re: [EVDL] Bolt Lithium Battery Chemistry for 100% charging?
It seems to me that most BMS algorithms don't allow either full charge or full discharge. They reserve capacity for longer life, and to use as the battery degrades. Our Zoe has a ~56kWh battery with 52kWh usable, so about 4% is reserved. Our garage is freeze and heat-wave resistant, usually 14-22 deg C year round (thick stone walls), so that's good for the battery. I still don't like to let it sit at 100% (~97% actual) for longer than necessary. Normally we just charge to full the night before we take a longish trip. If the car gets down to 20-25% in shorter trips, I charge to between 80 and 90%. The car has no option for such, so I manually stop the charge around 2h before the guessometer thinks it will be full. As I understand it, equalization only happens at 100% indicated. We do that at least once a month, so I'm not too concerned. (Other opinions?) Zoe has going since 2012 and there are lots of examples of older ones retaining 90-98% of factory capacity at well over 100,000km, with no special treatment. I suppose that with the Bolt you don't have quite as long a history to look at. Recently I read of a 2017 Zoe used in taxi service that was at 96% capacity at over 350,000km. Taxis don't sit at 100% for any length of time so I'm sure that helped. That would have been with LG E63 LiPo cells. Our 2020 cells are LiNCM, LG E78, 192 of them, 78ah each. I don't know what difference the chemistry will make, if any.. This scheme might not work for you since you seem to put lots more miles on your EVs than we do, but I suspect that it's possible to overthink these matters. And hey, you'll soon have a nice new battery, no? Congrats on getting your stealer to cooperate. David Roden, EVDL moderator & general lackey To reach me, don't reply to this message; I won't get it. Use my offlist address here : http://evdl.org/help/index.html#supt = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = You shouldn't have to choose what you want, because we will be able to get enough data to know what you want better than you do. -- viral media company founder Emerson Spartz = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
Re: [EVDL] Followup: Overheating Tesla display
Did you actually have blackouts before installing the aluminum flashing? I never had a single one in three years of my Model 3, living in eastern WA which is sunny all day almost every day, and gets very hot in the summer. Cheers, Kevin Horton > On Dec 2, 2023, at 07:33, Mark Hanson via EV wrote: > > I glued a 4.5” x 13” aluminum metal flashing plate behind the display to > reflect the sun (with elephant snot AKA silicone rubber). That should stop > blackouts in the summer. I did this on the back of our flat TV that failed > due to heat, 2nd TV with reflective Mylar stays cool (in the window south > facing). > > Sent from my iPhone > > On Nov 27, 2023, at 12:45 PM, Mark Hanson wrote: > > > > https://www.greencarreports.com/news/1135819_tesla-recalls-cars-for-overheating-issue-of-screens-not-battery-packs > Has anyone noticed the backside of the Tesla 3 or Y screen really hot? And > added a reflective coating or heat sink to correct the problem ? > Stay Charged, > Mark > Sent from my iPhone > -- next part -- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231202/408a1e94/attachment.htm> > ___ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
[EVDL] Bolt Lithium Battery Chemistry for 100% charging?
Hi Folks Shelor Chevy in Christiansburg Va finally caved in to me requesting a battery replacement on my 2020 Bolt EV after 2 weeks and ordered the replacement battery. GM is still not requiring 80% charge for local trips like all other EV manufacturers using NMC lithium batteries. Online I see LiFePo4 batteries that are less sensitive to 100% continuous charging being used on some new EUVs and then also see nickel -nmc being added to new and replacement packs. Does anyone know what final lithium based chemistry that GM has decided on to allow full 100% charging every time without longevity problems? Just curious what new chemistry I’m getting in the next month when they install the new battery and how best to treat it for longevity. Battery university.com indicates that LeFePo4 is more tolerant of constant full charge - so I ordered some for my Bergey wind/solar backup that keeps a float 28.2V (is adjustable) on 24V 380ah batteries. Hopefully will last 10 years or so instead of the Interstate flooded lead L16’s that had open cells in 5 years. Best regards Mark in Roanoke VA https://static.nhtsa.gov/odi/tsbs/2021/MC-10200142-.pdf Sent from my iPhone ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
[EVDL] Followup: Overheating Tesla display
I glued a 4.5” x 13” aluminum metal flashing plate behind the display to reflect the sun (with elephant snot AKA silicone rubber). That should stop blackouts in the summer. I did this on the back of our flat TV that failed due to heat, 2nd TV with reflective Mylar stays cool (in the window south facing). Sent from my iPhone On Nov 27, 2023, at 12:45 PM, Mark Hanson wrote: https://www.greencarreports.com/news/1135819_tesla-recalls-cars-for-overheating-issue-of-screens-not-battery-packs Has anyone noticed the backside of the Tesla 3 or Y screen really hot? And added a reflective coating or heat sink to correct the problem ? Stay Charged, Mark Sent from my iPhone -- next part -- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231202/408a1e94/attachment.htm> ___ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
