I have gotten `18 k with my work truck/trailer that i drive about 30 miles a day . I only discharge 50 % and plug in everywhere I can.I also ran them till I could only get 50 amp hours out (6 v 3600 excides). AT that point they cost more to charge then they were worth. For me seeing how far I can go on a pack is kind of a game but last pack I sold befor they were shot . ----- Original Message ----- From: "Bob Rice" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, September 21, 2002 12:20 AM Subject: Re: Real Battery Life (Newbie question)
> Sent: Friday, September 20, 2002 11:46 AM > Subject: Re: Real Battery Life (Newbie question) > > > > Paul G wrote: > > > In the world of lead acid batteries I don't think anyone (at least in > > > modern times) had managed to get a pack in an on-road vehicle (car or > > > Pickup) to last much more than about 30k miles. > > > Hi All; > > Hadta jump in on THIS one. Did 22k on a set of old, used T-105's in my > Rabbit, when I forst got it up an' running wioth a Contactor controller, > about 4 yearz ago. Pretty well beat them to death over that year, with > numerous running down till the car would hardly move. Easy to do with a > contactor controller, running off a juicy acc. battery. > > > It all depends on the batteries you choose. Let's say we have a > > long-range EV with about half its weight in batteries, like the Red > > Beastie pickup, which can go 100 miles on a charge: > > Running T-145' s now, I THINK I could do 100 miles on a charge, if I > did litely on the go pedal' Did do 80 several weeks ago, at 45-50 Mph, and > kept it below 150 amps on launches. Havent run the T-145's DEAD, have over 6 > k on 'em now, were still honeymooning! Never ran then below 90 volts, with a > 120 volt system, when tired They always sprang back to 120 v at rest. So I > think they are in the prime of their lives, and should gine me, say, maybe > another 25k or so? Treating them nice, like that.? > > > > Consider AGMs, like Hawkers or Optimas. Life at a 1C discharge rate is > > generally around 250 cycles at 80% depth of discharge, or 400 cycles at > > 50% DOD. Cycles x DOD is the same for both, so the pack will last 250 > > cycles x 80% x 100 miles = 20,000 miles. > > > > Now consider 6v golf cart batteries. Using the data Martin Jackson just > > posted, the greatest total mileage occurs at 560 cycles and 40% depth of > > discharge. The pack will last 1400 cycles x 40% DOD x 100 miles = 56,000 > > miles. > > > > Then there are *really* long life lead-acids, as used in forklifts and > > other industrial vehicles. Oldham tubular plate flooded lead-acid cells > > are rated at 6500 cycles to 10% DOD, 2400 cycles to 50%, and 1350 cycles > > to 75% DOD. Best life is at 50% DOD, where the pack will last 2400 > > cycles x 50% x 100 miles = 120,000 miles! (To satisfy the skeptics, Eric > > Sandell of Sweden put a set of *used* Oldhams in his Nissan Micra EV > > conversion. Last I heard, he has over 50,000 miles on them and they are > > still going!) > > > > But the drawback is that maximizing life also increases internal > > resistance and Peukert effects. Thsi means the lower the battery life, > > the less peak power you can get out of it. The AGMs give you fast > > accelleration and high top speed, but short life. The Oldhams give you > > great life, but sluggish accelleration and low top speed. > > > I LIKE this thinking, below.Like the Hawkers, John Wayland an' the > Racers use. Don't know WHERE I could put them in the Rabbit. Glove > compartment, maybe? A couple? Anybody done this concept? > > > What I think is an interesting concept is to combine the two types into > > a single "hybrid" battery pack. Use the AGMs for fast accelleration, > > then recharge them from the floodeds. The AGMs depth of discharge is > > very low, for long life. Conversely, the AGMs shield the floodeds from > > the high peak currents; they can deliver power smoothly and continuously > > to minimize losses from internal resistance and Peukert effects. > > -- > Bob Rice > > Lee A. Hart Ring the bells that still can ring > > 814 8th Ave. N. Forget your perfect offering > > Sartell, MN 56377 USA There is a crack in everything > > leeahart_at_earthlink.net That's how the light gets in - Leonard Cohen > > > >
