matt lacey wrote:
> > Hi Guys,
> >
> >
> >> OUCH!!
> >> More detail please.
> >> 1. Thundersky or Sky energy?
> >> 2. Were they early ones or new and improved?
> >> 3. How far were you discharging them? 100%, 80%?
> >> 4. Same question a different way. 60% of what?
> >>
> > Thundersky 40Ah cells, 02-Oct-2007 production date
> > discharge depth was between 30% and 80%, with an average around 50%.
> > 60% of 40Ah, or 24Ah capacity remaining
> >
> How are you defining DoD -- original capacity or capacity at that time?
> What BMS did you use?
> What per-cell voltage did you charge to?
> What was your lower voltage limit? If you never went below 80% DoD, I
> take it no cell ever went below 3V?
>
> Cory
>
> > continuous discharge rate was 55A (necessary to maintain 35mph)
> >
> >
> >> Wow. I've NEVER heard this before. Could you provide links to
> >> supporting information? I've got CALB 60Ah batteries and I'm typically
> >> running 0.9 to 1.2 C during cruise.
> >>
> > http://evcomponents.com/cscart/index.php?dispatch=attachments.getfile&attachment_id=28
> >
> > Theres CALB's data sheet.
> > it looks like TS have increased their true continuous current to 0.5C.
> >
> > discharging faster reduces cycle life exponentially.
> >
> > at 1.4C you get better than 500 cycles.
> > at 1C the service life is long enoguh I haven't heard of significant early
> > reduction in capacity.
> >
> > My new bike runs at 1.1C at 70mph, (
[email protected]) but unlike the old scooter,
> > thats not from the moment I turn it on to the moment I turn it off.
> > Thats just when I'm going reasonably fast.
> >
> > Matt
> >
> >
> > ----- Original Message -----
> > From: "Mark Grasser" <
[email protected]>
> > To: "'Electric Vehicle Discussion List'" <
[email protected]>
> > Sent: Saturday, December 11, 2010 3:45 AM
> > Subject: Re: [EVDL] Lithium 60ah 144volts vs 100ah 120 volts?
> >
> >
> >
> >> OUCH!!
> >> More detail please.
> >> 1. Thundersky or Sky energy?
> >> 2. Were they early ones or new and improved?
> >> 3. How far were you discharging them? 100%, 80%?
> >> 4. Same question a different way. 60% of what?
> >>
> >> Sincerely,
> >> Mark Grasser
> >>
> >>
> >>
> >> -----Original Message-----
> >> From:
[email protected] [mailto:
[email protected]] On
> >> Behalf
> >> Of matt lacey
> >> Sent: Friday, December 10, 2010 2:26 PM
> >> To: Electric Vehicle Discussion List
> >> Subject: Re: [EVDL] Lithium 60ah 144volts vs 100ah 120 volts?
> >>
> >> Dennis,
> >>
> >>
> >>> Specs for Thundersky show constant current at 3C and CALB shows 4C.
> >>>
> >> No no, those are for 30 seconds only.
> >> Their continuous rating is 0.3C
> >>
> >> they will do 1C continuous.
> >>
> >> at 1.4C continuous with 4C peaks, my 40Ah cells lasted 500 cycles to 60%
> >> of
> >> original capacity.
> >>
> >> keep the continuous discharge rate down.
> >>
> >> it sorta scales exponentially
> >>
> >> Matt
> >>
> >>
> >> ----- Original Message -----
> >> From: "Pestka, Dennis J" <
[email protected]>
> >> To: "Electric Vehicle Discussion List" <
[email protected]>
> >> Sent: Friday, December 10, 2010 8:54 PM
> >> Subject: Re: [EVDL] Lithium 60ah 144volts vs 100ah 120 volts?
> >>
> >>
> >> Evan;
> >>
> >> Curious to your comment about not going above 1C at cruising speed.
> >> Specs for Thundersky show constant current at 3C and CALB shows 4C.
> >>
> >> Thanks;
> >> Dennis
> >> Elsberry, MO
> >> http://www.evalbum.com/1366
> >>
> >>
> >> -----Original Message-----
> >> From: Evan Tuer [mailto:
[email protected]]
> >> Sent: Thursday, December 09, 2010 6:27 AM
> >> To: Electric Vehicle Discussion List
> >> Subject: Re: [EVDL] Lithium 60ah 144volts vs 100ah 120 volts?
> >>
> >> On Wed, Dec 8, 2010 at 11:32 PM, Kyle Bonds <
[email protected]>
> >> wrote:
> >>
> >>> I am short on cash, and have been happy with my 15 mile range, and if
> >>> I use 60ah lithiums I can afford the switch and still have 144 volts.
> >>> My worry is that pulling 150 amps for 5 minutes on my commute every
> >>> morning and evening, and 200 amps for 10 seconds every morning to pull
> >>> out onto the road, would kill the 60ah batteries.
> >>>
> >> I would say that's pushing them far too hard. You shouldn't go above 1C
> >> at
> >> cruising speed.
> >> And in cold weather the voltage sag will make it undriveable, unless
> >> you're
> >> planning to heat them as well.
> >>
> >> If you're happy with 15 miles range and don't have much money, stick with
> >> lead, or you'll just be buying yourself a problem.
> >>
> >>
> >>
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