Well, it is obvious that I connected with the right group to learn about evs. The responses have been great, and nobody made me feel as ignorant as I am about batteries. I am learning, and you guys can take the credit for that.
George Mullineaux 3rd Shift Wrench Monkey Pinnacle Corrugated, Landis, N.C. -----Original Message----- From: EV <ev-boun...@lists.evdl.org> On Behalf Of Lee Hart via EV Sent: Thursday, August 13, 2020 17:13 To: Electric Vehicle Discussion List <ev@lists.evdl.org> Cc: Lee Hart <leeah...@earthlink.net> Subject: [External] Re: [EVDL] [External] Re: Fast Charging Various Companies CCS Chevy Bolt George Mullineaux via EV wrote: > Here at work, we have some evs for moving equipment and boom lifts. I was > under the impression that the slow charge after the 80% level was for deep > charging. We have two trolleys that have been charged in this manner for 6 > years on the same batteries. I wonder if maybe the fact that they are > lead-acid makes their charging properties different? I am not extensively > trained with evs, just go with what I have been told. I do love to learn. Hi George, Pretty much all battery chemistries (lead-acid, nickel-, and lithium at least) benefit from a slower charge rate as they approach "full". The rule of thumb is to slow down charging above 80% state of charge. Over-charging also shortens the life of the battery. The extra energy doesn't get stored as charge; it gets converted into heat, gas, and other destructive side reactions. If it's a "flooded" battery with vent caps, you can replace the water lost. But you can't do this with sealed batteries (and all lithiums are sealed). They simply "die young" when enough over-charging has accumulated. Hope this helps, Lee Hart -- A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away. -- Antoine de Saint Exupery -- Lee Hart, 814 8th Ave N, Sartell MN 56377, https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__http%3A%2F%2Fwww.sunrise-ev.com__%3B!!CvttNVKvMsQ7MGjF!sz9WM4uulcrMufyhGWdUz-AAuh6Avn0ncoJtG5kIZs1q_PzRGC9PNmoHRI6NPHRGII8tawvYW7k78PU%24&data=02%7C01%7Cgeorgemullineaux%40pinnaclecorrugated.com%7C7e70848ce94e4cce571908d83fcd4cc0%7C976178cc71b24588b870337d092cdfe3%7C0%7C0%7C637329498272859011&sdata=RnmpMP5Y2dMuY8TjglbpwELR6NWd2hYqdRmeXhMgNj0%3D&reserved=0 _______________________________________________ UNSUBSCRIBE: https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__http%3A%2F%2Fwww.evdl.org%2Fhelp%2Findex.html*usub__%3BIw!!CvttNVKvMsQ7MGjF!sz9WM4uulcrMufyhGWdUz-AAuh6Avn0ncoJtG5kIZs1q_PzRGC9PNmoHRI6NPHRGII8tawvYpm0s_Xc%24&data=02%7C01%7Cgeorgemullineaux%40pinnaclecorrugated.com%7C7e70848ce94e4cce571908d83fcd4cc0%7C976178cc71b24588b870337d092cdfe3%7C0%7C0%7C637329498272859011&sdata=smaamXxqhPHuodG%2BS61onEqEAivPLbdftsn%2BhZwygQA%3D&reserved=0 ARCHIVE: https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__http%3A%2F%2Fwww.evdl.org%2Farchive%2Findex.html__%3B!!CvttNVKvMsQ7MGjF!sz9WM4uulcrMufyhGWdUz-AAuh6Avn0ncoJtG5kIZs1q_PzRGC9PNmoHRI6NPHRGII8tawvYEje-Rn8%24&data=02%7C01%7Cgeorgemullineaux%40pinnaclecorrugated.com%7C7e70848ce94e4cce571908d83fcd4cc0%7C976178cc71b24588b870337d092cdfe3%7C0%7C0%7C637329498272859011&sdata=dK6SilHnZjXkNDAFNg3RC6P9bgtwKqXdbyl4rKPXGB4%3D&reserved=0 INFO: https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__http%3A%2F%2Flists.evdl.org%2Flistinfo.cgi%2Fev-evdl.org__%3B!!CvttNVKvMsQ7MGjF!sz9WM4uulcrMufyhGWdUz-AAuh6Avn0ncoJtG5kIZs1q_PzRGC9PNmoHRI6NPHRGII8tawvYNlsQVUY%24&data=02%7C01%7Cgeorgemullineaux%40pinnaclecorrugated.com%7C7e70848ce94e4cce571908d83fcd4cc0%7C976178cc71b24588b870337d092cdfe3%7C0%7C0%7C637329498272869003&sdata=pf0NPtzPqfrHG0y%2BO18gGwumf9A1qrmVUIeg6QvfC4o%3D&reserved=0 Please discuss EV drag racing at NEDRA (https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__http%3A%2F%2Fgroups.yahoo.com%2Fgroup%2FNEDRA__%3B!!CvttNVKvMsQ7MGjF!sz9WM4uulcrMufyhGWdUz-AAuh6Avn0ncoJtG5kIZs1q_PzRGC9PNmoHRI6NPHRGII8tawvYDUVSU7k%24&data=02%7C01%7Cgeorgemullineaux%40pinnaclecorrugated.com%7C7e70848ce94e4cce571908d83fcd4cc0%7C976178cc71b24588b870337d092cdfe3%7C0%7C0%7C637329498272869003&sdata=qYcbgr2uHKmQUDQ%2FX4lLTvcZm9hyCcjM99jkfzaHcjw%3D&reserved=0 ) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)