Re: Reviving lead batteries, buying new ones, Need Help getting 1980 Commuta going
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Hi Tom and all, ? ?In the Ccar you just need to circulate the coolant as unlikely to heat them much mostly to keep all the cells the same temp or the end cells can differ. To ib's post here, I'm at 2.5 yrs of use and charging? abuse yet the cells are still within 1/100th of? Volt of each other without a BMS. On a Chevy it certainly could be needed but almost no one uses a BMS on Volt modules. I charge to 49.2vdc as per Volt specs and use 38vdc as the low voltage as not much capacity under it anyway and not worth possible damage.? ?I've accidently charged to 58vdc and had to run off a kwh to get it back to full charge with no damage I can tell but wouldn't do it again. Jerry Dycus?
On Tuesday, August 4, 2020, 10:40:38 AM PDT, Tom Rymes <tom@...> wrote:
On 08/04/2020 12:00 PM, ibdilbert01 via groups.io wrote:
> Volt batteries work well, I have two sections @ 48 volts in mine.? ?You
> really do need BMS on those cells, they are like any other lithium
> cells.? You can get by with it for the first few years, but after a
> while some cells will become weaker and without BMS you will shorten the
> life of your batteries (specifically the weaker cells).? ? The Chevy
> volt has both passive and active BMS onboard.? GM didn't do this because
> it "wasn't necessary".? ?A properly configured 48 volt lithium pack will
> charge to 50.4 volts and shouldn't be discharged below 36 volts.
On a similar note, Chevy didn't install water cooling because it "wasn't
necessary", either. Has anyone plumbed up the water channels, along with
a small pump, rad, and fan for temperature control while charging, etc,
or is the rate of charge/discharge so much slower nobody bothers?
Tom
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