Date: Thu, 9 Feb 1995 13:45:44 -0800
Sender: Vanagon Mailing List <vanagon@vanagon.com>
From: rathkem@admin.ci.seattle.wa.us
Subject: Batteries (I was delusional)
I'm going to try and pull myself out of this one....
I plead lack of caffiene. :0
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>Date: Thu, 9 Feb 95 12:14:32 CST
>From: David Schwarze <schwarze@superc.nosc.mil>
>To: Multiple recipients of list <vanagon@lenti.med.umn.edu>
>Subject: Re: Westy auxiliary battery (why not keep it going)
>This is not ideal because most of the time, the output of one half of the
>alternator will be wasted charging the almost-full starter battery. Also,
>what is the fascination with three golf cart batteries? :) You are the
>second person that has mentioned this. The golf cart batteries I have seen
>are all 6 volts, and therefore the third one would be essentially useless.
I got the three battery setup from some presentation I went to... I don't
clearly remember the setup for three batteries, but your right it doesn't
sound right.
We do have one truck with 4 golf cart batteries wired in series-parallel, it
will run a refrigerator for 17 days. :)
>Deep cycle batteries are not designed to be drained completely. I think
>the manual for mine said to avoid discharging more than about 75 percent,
>and preferrably 50 percent. Anything more will greatly accelerate the
>death of the battery. The golf cart batteries are designed for heavy
>current draw over an extended period, similar to a marine/rv battery.
>Golf cart batteries _are_ deep cycle batteries, just like the marine/rv
>batteries, except that they have even thicker plates (so I'm told) which
>accounts for their extreme mass and longevity when compared to other types
>of batteries.
Again you are right, about the batteries. The golf cart battery is a very
deep cycle battery. I understand that periodic draining of a deep cycle
battery is a good thing because it maintains the "memory" of the battery. As
I understand it, during the charge/discharge cycle of the battery an oxide
develops on the plates, and without a complete discharge ocassionally the
battery will not store as much of a charge as long.
>> ** As an aside: in putting together my latest fire truck project I used a
120
>> amp dual output alternator one side connected to the truck battery, and the
>> other side connected to (2) 8d auxillary batteries. The truck batteries
are
>> continually topped off with a shore power connection. I used the deep
cycle
>> because those emergency lights suck the power like nothing else.
>Is that 120 amps per side, or 60/60? In any case, it sounds expensive. :)
Again I plead chemical imbalance, the alternator is a 200 amp, with two
windings providing 100/100 per side. $ 800.00
Thanks for the corrections. I'm glad you staightend me out.
Matt Rathke, A little confused.
rathkem@admin.ci.seattle.wa.us
-David
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David Schwarze '73 VW Safare Custom Camper (Da Boat)
SAIC Comsystems '73 Capri GT 2800 (Da Beast)
San Diego, California '87 Mustang Lx 5.0 (Da Bruiser? Soon...)
schwarze@nosc.mil http://papaya.nosc.mil/~schwarze
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