Spacey wrote:Tommy: Those Heasways will go way out of whack without a BMS, trust me I've been there lol. It's not so much the discharge more of the weakest cell forcing the strongest cell to make up the slack and become overcharged when you charge the pack.
I've heard that conditioning the headways thru several charge and discharge cycles will eventually stabilize the pack.
I'm using the new RED 38120HP. I'll see how the fair.
I've match the pack up. Ran it a few times, identified the problem cells and changed them. I use 0.25 inch thick T6 6061 Aluminum bus bars with
the headway bus bar stacked on top to keep resistance to a minimum. I can charge the pack with RC chargers at 7 points with balance charge at 4S.
I can use bleed resistor (battery medics) while charging in the 36v x2 way. I also have another bleed resistor net work that will bleed off voltages of
above 3.65v available across each cell if I'd like. Also, my 36v chargers are for a 37v 10s5p battery and max out at 41.3v not 43.8v. A bit of safety
there too. I'd rather watch them, then find a BMS went bad and took my pack down.
So if I have to babysit a BMS then I'd might as well babysit
the pack. I get a solid 40amp (3.2kw) from the 28S1P. During that peak, I might sag to 2.9v briefly and mostly stay above 3.0V and just under 3.2v
while I cruise at WOT
As for the Series the BMS, I believe that I've seen a post in which they mention that it's not an issue.
As for Isolation while charging? I'm doing it, I believe that it's a function of the charger to be Isolated or not, but please ask
someone who really knows.
Tommy L sends... \\m//