Ah Ha! That is what I saw in the back of the J.B. Straubel's Porsche
conversion when I followed him using his pusher trailer to his home
(many years ago). The pack just behind the front seats and had little
light dimly lights between the cells. So, that was the BMS he used in
his EV conversion design ... neat!
...
OK, no one has posted about one of my queries as to if the prepackaged
12V Li-ion battery that would drop as a replacement to my dying 12V
group-24 deep cycle. So, I will assume there is no problem trying one.
{brucedp.150m.com}
-
On Thu, Feb 14, 2013, at 09:03 PM, Lee Hart wrote: ...
> Back to the original question: How to balance four lithiums in series
> being used as a 12v battery. If you do nothing else, at least put a
> zener diode and light bulb in series across each cell. This will serve
> as a crude BMS. It's a poor regulator; but dirt cheap and better than
> nothing. It will a) bypass at least some of your excess charging
> current, b) tend to equalize the voltage across all four cells, and c)
> give you a visual indication if your voltage is just plain too high.
>
> A 3.9v 5w zener (1N5335) and #PR2 flashlight bulb should be about right.
> The 1N5335 shunts about 25ma at 3.3v, 100ma at 3.6v, 300ma at 3.9v (bulb
> dimly glowing), and 500ma at 4.1v (bulb lit).
-
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