RE: [PSUBS-MAILIST] Battery question

[Jeff Post <jeffpost@rawbw.com>]

There may be other considerations that should be examined. What about energy
storage density differences between the two batteries? What are the amp/hour
differences, and what are the displacements of the two choices? Also, I don't
think the cost factors were examined very carefully. I believe that AGM
batteries are about 3 times more expensive ( metric conversion = 3 times more
expensive :) ). It seems that decisions are being made without much consideration.

Jeff



Quoting Warrend Greenway <dub@linuxmail.org>:

> Sounds good. I'll just wait a bit before making a decision, then!
> :)
> 
> Warren.
> 
> > Solo has AGMs inside the pressure hull. One of the more bizarre design
> details is they're mounted on the "ceiling" instead of the floor. This
> is to raise the center of gravity, since its a flyer and I'm trying to
> reduce the self-righting moment. And if that wasn't weird enough,
> they're upside down so I can get at the lugs.
> >  
> > My main recommendation for battery safety using AGMs is to invest in a
> really good charger to prevent H2 gassing. I got a "Truecharge 40",
> which was about 400 odd bucks. Its microprocessor controlled and
> designed specifically for AGMs, which have a different charging voltage
> than other technologies.
> >  
> > We'll see if it all blows up once completed.
> >  
> > :)
> >  
> > Alec
> > 
> > 	-----Original Message----- 
> > 	From: Warrend Greenway [mailto:dub@linuxmail.org] 
> > 	Sent: Tue 1/28/2003 1:43 PM 
> > 	To: personal_submersibles@psubs.org 
> > 	Cc: 
> > 	Subject: Re: [PSUBS-MAILIST] Battery question
> > 	
> > 	
> > 
> > 	I know about the hydrogen venting during charging cycles. So if
> > 	they are in the hull do you just open the hatch and stay clear
> > 	when you are charging? Is there any problem while discharging?
> > 	I know you have to keep the batteries dry...
> > 	
> > 	Warren.
> > 	
> > 	> Loading battery is the problem.. creates hydrogen fummes.
> > 	>
> > 	> Hatch should be open and airventilation by little
> > 	> pipe on a hose should fix it. 
> > 	>
> > 	> On a diesel-electric sub the diesel can eat the hydrogen during
> > 	> chargeing the batteries.
> > 	>
> > 	> Carsten
> > 	>
> > 	> Warrend Greenway schrieb:
> > 	> >
> > 	> > Hey, I have a battery question, for those information buffs: What
> would
> > 	> > the overall dangers and benefits of placing the batteries inside
> the
> > 	> > pressure hull be? What do you do about battery venting, if they
> are in
> > 	> > water-tight battery pods? This isn't random, I was laying out
> parts of
> > 	> > the OSS pressure hull and found that the batteries fit neatly
> inside the
> > 	> > base of the hull. They could be sealed with an air tight  bolt-on
> deck.
> > 	> > Any input? Should I give this up now and place the batteries in
> pods
> > 	> > outside the hull??? Any input would be great!
> > 	> >
> > 	> > Also, for those info buffs, what about compiling a list on
> applicable
> > 	> > battery information for review?
> > 	> >
> > 	> > Warren.
> > 	> > --
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Jeff Post

Everything can be inherited except sterility.