--- [EMAIL PROTECTED] wrote: > Date: 3 Oct 2002 18:20:30 -0000 > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > Subject: failure delivery > > Message from yahoo.com. > Unable to deliver message to the following > address(es). > > <[EMAIL PROTECTED]>: > Sorry, I wasn't able to establish an SMTP > connection. (#4.4.1) > I'm not going to try again; this message has been in > the queue too long. > > --- Original message follows. > > Return-Path: <[EMAIL PROTECTED]> > Message-ID: > <[EMAIL PROTECTED]> > Received: from [63.200.150.3] by > web20410.mail.yahoo.com via HTTP; Wed, 02 Oct 2002 > 10:19:20 PDT > Date: Wed, 2 Oct 2002 10:19:20 -0700 (PDT) > From: Lin Tse Hsu <[EMAIL PROTECTED]> > Subject: Re: New battery technology - Nicad still > looks good > To: [EMAIL PROTECTED] > In-Reply-To: > <[EMAIL PROTECTED]> > MIME-Version: 1.0 > Content-Type: text/plain; charset=us-ascii > > Hi David. > Thanks for computing the following numbers: > > >So, here's the conclusion: > > > >Battery (Cost per kWh delivered over battery > lifetime) > > > >USBMC Golf car lead ($0.03) > >Saft NiCd ($0.24) > >TS LiIon ($0.39) > >Evercell NiZn ($0.61) > >Optima YT lead ($0.58 - $1.31) > > The first number is a little suspicious. There may > be > a slight error > in the intermediate calculation: > > >US Battery 2200 (from US Battery's web pages) > >Price ~$50 each in small quantity > >Mass 28.6kg > >Capacity 115min @ 75a => 144ah @ 75a => 864 wh > >Specific energy = 30 Wh/kg > >Cycle life 550 @ 80% DOD > > > >144ah * 6v * 550 cycles = 1815 kWh * 0.8 (DOD) = > 1452 > kWh total > ^????????? > >$50 / 1452kWh = $0.03 / kWh > > But, I do agree with your conclusion. Although > Nicad's do last a > long time, they cannot be expected to last 27 years > under constant > pounding. The reason that this can be said with > confidence is that > there is another traction application for which > Nicad's have a long > track record, and their performance is pretty well > established. > > One may object that the discharge rates are higher, > but read the > fine print. Overcharging kills Nicad's. And, EV > application does > have a bad track record for overcharging. Just > search > the archives > on: cook, Zivan, toast, Optima, gassing, battery > breakfast, etc. > > And, hasn't it been said that "everybody murders > their > first pack." > > Here are some resources for those who are interested > in reading > further: > > http://www.rcbatteryclinic.com/seminar.htm > http://www.rcbatteryclinic.com/ > > For some real life experiences with lead acid > batteries and data on > how many amp hours one can extract from them: > > I am using about 50 amp/hours on a warmish day, > which > if my batteries > are > 225 amp/hr. means that I am at approx. 80% DD - or > am > I figuring wrong? > The E-Meter indicates that I am close to that, and I > have a harder time > maintaining the 55 MPH speed limit at the end. Most > of > my commute is at > 55 - 60 MPH, with about 4 miles at lower speeds > through town. > > ... > > I'm using a ADC 9" with an Auburn Scientific Kodiak > controller, which > is > water- > cooled. > > I have a lot of stoplights and stop signs (about 8 > of > them!), so if I > hit > them all > wrong (which happens occasionally!), I will have a > lot > of > accelerations. I > get up > to 350 amps on accelerations from a standing stop, > but > typically draw > less > than > 150 when cruising, except toward the end of the run. > The last several > miles > it > takes 200 amps or a little more to maintain 55. > > Joseph H. Strubhar > > > > Joseph H. Strubhar wrote: > > > > >Peter, I am getting only about 20 miles with > T-105's at 120v - so I > think > > > __________________________________________________ > Do you Yahoo!? > New DSL Internet Access from SBC & Yahoo! > http://sbc.yahoo.com
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