Shawn,
Thank you for the clarification. I was uncertain of that equation.
However, it is my understanding that the follow arrangement would be
identical as far as power output...and capacity, since :
120 volts @ 100 A/H vs. 240 volts @ 50 A/H
With my mechanical background, I relate this as being similar to
having an engine produce half the torque as the other engine, but at double
the engine speed, making the HP figure identical. From the little education
that I have in electrical, at one point I learned that having more voltage
allows you to run with a lower amperage requirement. I.E. an EV with a
60volt system would require much more (double-ish) amp load than a 120volt
system in order to accomplish the same work. Am I correct to calculate that
if I ran more voltage (a 240 volt system with 54 amp/hours) versus a system
with less voltage (120volts with 108 amp/hours), which will actually require
the same number of batteries...exactly twice as many as previously
theorized. The question is: Am I confusing Amp/hours with amps in general
as a load. I do not think that I am, but am looking for clarification.
Also, what is the answer to the method of wiring up the diodes to
maintain a proper charge/discharge setup so that they don't fight each
other?
~Best,
Scott Kuzma
---------- Forwarded message ----------
From: "Shawn Waggoner \(FLEAA\)" <[EMAIL PROTECTED]>
To: "'FLEAA Mailing List'" <[email protected]>
Date: Tue, 15 Jan 2008 08:46:48 -0500
Subject: Re: [FLEAA] listserv Digest, Vol 6, Issue 17
Scott and all,
On batteries and capacity, voltage is additive in a series configuration,
but capacity is constant. Voltage is constant in parallel, but the capacity
is additive. Here are a couple of quick diagrams I worked up to show the
difference:
The first is a series circuit and you can see that the voltage is additive
but the pack is still only 50Ah. The second one has the batteries in
parallel so you only have a 12V pack, but the capacity is increased.
If combine the 2 concepts into a series-parallel configuration, like below,
you get a higher voltage and increased capacity.
I also found a good battery primer on Intersil's site:
http://www.intersil.com/data/an/an126.pdf
Hope this was helpful,
Shawn
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