Re: Electric vs. gas motor question
Kent Crispin (kent@songbird.com)
Sun, 6 Jun 1999 08:46:18 -0700
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West Wight Potter Website at URL
http://www.lesbois.com/wwpotter/
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On Sat, Jun 05, 1999 at 10:15:32PM -0500, LIONEL GALIBERT wrote:
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> West Wight Potter Website at URL
> http://www.lesbois.com/wwpotter/
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> Harry,
>If my recollection of electrical engineering school is correct (although it
>has been many years since) and you have a load drawing 50 amps with two
>batteries in parallel, each will furnish 25 amps for a total power of 600
>watts. If each battery has a capacity of 95amp/hour you would have a little
>over 3.5 hours of running time. On the other hand if the batteries are hooked
>up in series, to the same 50 amps load each will deliver 50amps for a total
>power of 1200 watts but with half the running time. You cannot squeeze more
>energy out of the same package no matter how you hook it up.
We all agree on that last point, that's for sure :-)
The presumption was, I think, that the motor power consumption was a
constant, not that the amperage drawn was constant. In other words,
the motor is a 24 volt motor, and it draws 25 amps, in contrast with
a 12 volt motor that draws 50 amps.
In reality, I think Harry's motor has somewhat more power than the
12 volt motor, but not twice as much, so the real numbers might be
something like 12v, 50 amp vs 24v, 30 amp.
--
Kent Crispin "Do good, and you'll be
kent@songbird.com lonesome." -- Mark Twain