List;
All batteries have "internal resistance" -- it's what limits the peak
current that they can deliver into a short circuit. Two batteries in
parallel have half the effective internal resistance of a single battery (of
the same size & type) so they can deliver more current into a very
low-resistance load, such as a stalled starter motor.
To make the two-battery setup effective, your battery cable should be BIG so
that its resistance isn't the limiting factor.
CCA is a pretty good guide to a battery's internal resistance. The higher
the CCA rating, the lower its internal resistance. Different types of
batteries have different characteristics. "High discharge rate" Ni-Cd
batteries have very low internal resistance and can pump beaucoup amps into
a short circuit. Never, never work around those while you are wearing your
wedding ring or wristwatch!
Regards, Neil
-----Original Message-----
From: ardunbill@webtv.net [mailto:ardunbill@webtv.net]
Sent: Sunday, January 05, 2003 9:35 AM
To: rtmack@concentric.net; land-speed@autox.team.net
Subject: RE: Topic Ideas
Hi Russ, no, the batteries are wired to keep the 12v system, plus to
plus, minus to minus; the rest of the bike can't run on 24v. I'm not a
battery expert, others on the List are, but I think it's something about
the total amperage capacity being increased, the CCAs, or something.
The battery system just has more 'balls' to crank the high-compression
engine better. I remember when we had a Cadillac with the 500 cubic inch
V8 some years ago, my garage pal said, "Bill, if that was my car, I'd
put the biggest battery I could get in there, to crank that baby!" And
he was right, the biggest CCA battery available cranked it and ran it
better than a smaller CCA alternative. Bill
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/land-speed
/// what is needed. It isn't that difficult, folks.
|