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RE: [PSUBS-MAILIST] Battery question
If there is one thing that will have me crawling up the walls,
it's manufacturers not providing detailed information. I have
already run into this problem with the batteries. It would be
really nice if one of our information collectors would call
the major battery manufacturers and get complete datasheets,
with methods, materials, properties, and cost. By the way,
why 10 amps for electronics and life support? The electronics
will run on a few milliamps...But I don't know what the life
support goodies will use...Is that where the current is going?
Warren.
> Upon inspection, it seems that no one wants us to be able to compare batteries
> online. I looked at the major battery manufactures, and at the common online
> boating stores. No one wants to give you the same stats for two different types
> of batteries.
>
> So, here is a composite view of flooded verses AGM batteries. I tried to use the
> type 27T battery style as a standard for comparison. It seems that AGM batteries
> are at least 2 times more expensive. Flooded are approximately $100 ea. AGM were
> $200 and up. Flooded batteries of this type were rated at approxiamately 105 AH
> using the 20 hour method. AGM's were 88 AH, although I can't be sure of the test
> method.
>
> Let's make some assumptions:
>
> 2 motors @ 40 amps X 5 hours running time = 400 AH
> life support and electronics 10 amps X 72 hrs (you do want to be
> rescued,right?)= 720 AH
>
> Fudge factor for incomlete charging or battery aging .75
>
>
> Equals 14 X $100 for flooded batteries = $1400
> or 17 X $200 for AGM batteries = $3400
>
> Maybe Dan could give us an idea of what he spent to purchase steel for his K350.
> That figure along with the battery cost could give everyone an idea if this
> realistically can be done on the proposed budget.
>
> Jeff
>
>
>
> Quoting Warrend Greenway <dub@linuxmail.org>:
>
> > Wrong, good sir. Those decision won't be made at all without quite a
> > bit
> > more consideration. I'm asking for all the information on battery
> > choices
> > from all the "info guys", and anyone else with info. Cost is a prime
> > consideration. Got any info or practical experience? Gimme.:)
> >
> > Warren.
> >
> > > 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.
> >
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>
>
> Jeff Post
>
> Everything can be inherited except sterility.
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