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Re: parallel packs?
- Subject: Re: parallel packs?
- From: "David Roden" <roden ald net>
- Date: Sat, 2 Jan 1999 21:38:20 -0500
- In-reply-to: <004201be36b0$93f36b20$e0f0accf@Maximum.ultranet.com>
- Sender: owner-elec-trak cosmos5 phy tufts edu
"Max Hall" <maxo iname com> writes:
> should a person put a second pack of batts in
> PARALELL with the first, or should I SEPARATE the circuits to make the
> traction pack drive the tractor, and the second pack just do the thrower?
I would be careful about paralleling poorly matched battery packs. If
they were the same age (had the same number of cycles) and were the same
brand and type, that would probably work OK.
With a mismatch, you can have one pack drained before the other. Usually
it will be the weakest cell which goes first. Normally, when this
happens, you notice the loss of power and quit working. However, with
the other pack still providing power, you wouldn't notice the weakness so
much, so you could end up reversing that dead cell. At best this will
pretty well ruin it; at worst, you could blow it up.
I wonder if you could put a *big* diode in series with each pack before
paralleling them. That way both would supply power, but they could not
charge each other. I'm not an engineer, so I'd ask someone who knows
more before trying this.
David Roden THE VIRTUAL PD
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