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Re: [PSUBS-MAILIST] Valence Epoch Li-ion Full-size Battery/ Hyman G. Rickover
Sirs,
Definetly "worth following" - but let me just ask - why do we like improwed
batteries ?
Lead acid batteries are old facion, they are heavy and energy content is
low. These new batteries are - perhaps less heavy, and the energy content is
still quite low.
My point is - that noting in the imagineble future of batteries will ever
come close to giving us an electric submarine with a range to transit to and
from ofshore dive sites in the facion that a diesel - electric boat can do.
I am instaling a 1.5 ton battery in UC-3 - costing a fortune - and it gives
me less than an hour of the output of the dieselengine - that uses about 12
liters of fuel pr. hour. Meaning 1500 kg lead acid = 10 kg dieselfuel. If
the super Li-ion comes - and stops exploding and gets economicly
accesseble - the figures may be 750 kg battey = 10 kg dieselfuel. Electric
endurance only still is very limeted. Part two - I enjoy the waste heat from
the diesels - electric boats tend to be quite cold.
Worth following, yes ofcause, but this is not the answer to range as such.
Only Adm. H. Rickovers politically chritical system and the good old diesels
can do that.
Some hover manufator of the 1950ies clamed that in the next decade ( the
60ies ) most hovers for home use would be nuclear powered - so no need for a
wire. If anybody here knows where I can get a few of those hovers !!!
Best regards,
Peter Madsen
----- Original Message -----
From: Cliff Redus
To: personal_submersibles@psubs.org
Sent: Wednesday, January 02, 2008 2:10 AM
Subject: Re: [PSUBS-MAILIST] Valence Epoch Li-ion Full-size Battery
Brent,
These Valence Technology Epoch Li-Phosphate batteries look interesting to me
as a way to increase battery capacity and life as compared with AGM
batteries I am now using. In my boat I use ten 12V AGM batteries each rated
at 100 Ah that weigh 65 lbs each for my main battery pack. They make a
model E27 which has the same form factor as the batteries I am using that
has a capacity of 122 Ah and weighs only 41 lbs. As an example as a direct
replacement in my boat I would get 22% more capacity with a weight reduction
of 37% for the same 10 batteries. I can use the same onboard battery
charger as I use for my AGM batteries and if you believe the manufacturer,
have a cycle life 2000. The manufacturer does not say anything about
venting gases during charging. With a 2-3 hour charge time, this would
significantly reduce the turn around time between dives for my boat. It
will be interesting to see what they sell for when they go on sale in March
of 2008. There battery management unit also looks interesting as it will
feed SOC data directly into my onobard PLC. This new battery technology is
worth following.
Cliff
----- Original Message ----
From: Brent Hartwig <brenthartwig@hotmail.com>
To: PSUBSorg <personal_submersibles@psubs.org>
Sent: Tuesday, January 1, 2008 6:11:42 AM
Subject: [PSUBS-MAILIST] Valence Epoch Li-ion Full-size Battery
This is the third generation product we can look forward to.
http://www.valence.com/assets/pdf/evs_faq.pdf
Regards,
Brent Hartwig
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