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,
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