Well, it sounds like you already have it figured out... a bad PT module or two
As far as the battery that drops to 10-9 volts before everyone else, it sounds suspiciously like a battery with an underperforming cell.
damon
> Date: Wed, 20 Oct 2010 22:18:51 -0400
> From:
[email protected]
> To:
[email protected]xxx.xxx.edu
> Subject: [EVDL] Odd things I see batteries doing....
>
> So I continue to work with this pack of 50 UB12260's in my Prizm. Each
> battery has a zener reg and a paktrakr. I also have an E-meter connected
> across both strings when the car is on for drive or charge.
>
> I see odd things.
>
> For example: On charge battery D6 on string 1 reads 8 volts while the
> other 24 batteries read a nice 15 volts. Battery C4 on string 2 reads
> 13.4 volts while the rest of the batteries read between 14.4 and 15.
>
> However when I stop charging within a minute both batteries read a nice
> 12.9 to 13 volts. And when driving they don't do anything unusual under
> load.
>
> Battery E4 is another oddie: It will charge up, then as I drive for
> about 5 miles it stays with the other batteries in terms of voltage
> (around 11 volts or so) then suddenly drops to 10-9 volts. I stop
> immediately, go home.
>
> Does this make any sense? Why would a battery have the same profile as
> it's neighbors, then suddenly dive? Why would the other batteries appear
> to drop in voltage under charge, to silly levels.
>
> One clue is the Paktrakrs overall pack voltage when compared to the
> E-meter. When that D6 battery is reading 8 volts, the overall voltage on
> the Paktrakr reads 369 as opposed to 375 on the E-meter and the other
> Paktrakr (actually the other one reads 376). I think the E-meter reads
> real scaled voltage while the PT sums up all the individual battery
> voltages. In that case why would the PT remote read off by 6 volts?
>
> How much can I even trust the Paktrakrs?
>
> Chris
>
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