Thunder-Sky batteries

[Jeff928]

Rod ,
  Thanks for the info.
Jeff
--- roddilkes <[hidden email]> wrote:

>
> Jeff,
>
> OC voltage can be up to 4.2V (safety limit) but
> drops back pretty quickly to
> 3.6V.
> Nominal voltage is 3.2V - 3.3V, the cells will drop
> back to this voltage on
> discharge and stay there until about 70-80%
> discharged.
>
> Rod
>
>
> Jeff Mccabe wrote:
> >
> > Hey Rod,
> >  I sent a quote request earlyer today for your bms
> > setup.
> >  I have another question though. What is the open
> > circuit voltage after the lfp cells come off the
> > charger. Say after at least 5minutes.
> >   I thinking of adding more cells to above my
> current
> > sla battery setup if I go with lfp200 to
> compensate
> > for say. I need to be below 190volts on my raptor
> 1200
> > controller before I precharge it or bad things can
> > happen :(
> > Thanks,
> > Jeff McCabe
> > --- roddilkes <[hidden email]> wrote:
> >
> >>
> >> TS LFP (Iron Phosphate) and LCP (Cobalt) are
> >> different animals.
> >> LFP cells have a lower internal resistance so
> don't
> >> self heat much.
> >> At least from my experience...
> >>
> >> Rod
> >>
> >>
> >> Bill Dennis-2 wrote:
> >> >
> >> > For me right now, cold is not the problem--in
> >> fact, just the opposite.  
> >> > Temps are 35 degrees C right now.  And after
> I've
> >> climbed that hill to
> >> > home, my pack is up to 45 degrees C.  I'm
> actually
> >> going to have to add
> >> > some active cooling.
> >> >
> >> > Bill Dennis
> >> >
> >> > roddilkes wrote:
> >> >> Sag is temperature dependent.
> >> >> It is winter over here now with temperatures
> >> around 10-15 Celcius
> >> >> But I can still pull 3C (270A) without sagging
> >> below 2.5V per cell.
> >> >> Summer gives better performance in my
> experience.
> >> >>
> >> >> TS LFP do not provide the same performance as
> say
> >> Optima SLAs.
> >> >> For range there is no contest though.
> >> >>
> >> >> Regards, Rod Dilkes
> >> >> www.ev-power.com.au
> >> >>
> >> >>
> >> >>
> >> >> Roger Heuckeroth wrote:
> >> >>  
> >> >>> Just out of curiosity, how much voltage sag
> are
> >> you experiencing at  
> >> >>> load?  You say they are holding up, but at
> what
> >> performance?
> >> >>>
> >> >>>
> >> >>> On Jul 17, 2008, at 10:41 AM, roddilkes
> wrote:
> >> >>>
> >> >>>    
> >> >>>> Just FYI I have a set of 45 TS LFP90AHA
> cells
> >> running in my EV for  
> >> >>>> 18 months
> >> >>>> now.
> >> >>>> They are still behaving like the day I
> bought
> >> them.
> >> >>>>
> >> >>>> Regards, Rod Dilkes
> >> >>>> www.ev-power.com.au
> >> >>>>
> >> >>>>
> >> >>>> --
> >> >>>> View this message in context:
> >> >>>>
> >>
> >
>

http://www.nabble.com/Thunder-Sky-batteries-tp18330177p18510061.html

> >> >>>> Sent from the Electric Vehicle Discussion
> List
> >> mailing list archive  
> >> >>>> at Nabble.com.
> >> >>>>
> >> >>>>
> >> >>>>
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> >> >>>> ev
> >> >>>>      
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> >> >>>
> >> >>>    
> >> >>
> >> >>  
> >> >
> >> >
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> >>
> >> --
> >> View this message in context:
> >>
> >
>

http://www.nabble.com/Thunder-Sky-batteries-tp18330177p18524540.html

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> >> mailing list archive at Nabble.com.
> >>
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>
> --
> View this message in context:
>

http://www.nabble.com/Thunder-Sky-batteries-tp18330177p18553499.html

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> mailing list archive at Nabble.com.
>
>
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[goev]

Hello, everyone

I am new to this community, and doing a little research on the EV batterty.   I just found out a few days ago, the founder of TS -- Mr. TS Zhong -- got into this business in 1983, after reading an article about energy shortage, at that time he was a traditional Chinese Medical Doctor, and had studied stage design before.  I don't know him personally, but seems to me, he is not a typically Chinese businessman, but rather an inventor.  

If any of you are familiar with how a semi-conductor chip is manufacturered, you'll probably appreciate more about these Lithium batteries.  When a chip advance from 60nm to 45nm, the cost goes up , because maybe only 3 out of 10 are usable, but this rate will improve over time, hence the droping of the cost.    

Lithium batteries is a new technology that needs time to perfect, anyone who wants to buy them now pays the ticket.  It's the same story with Intel, the new CPU costs $600 today, will only worth $150 in one year, or two.  And there is also an untold story, the $600 CPU is identical to a $250 one -- they are of the same design, but with maybe 10% difference in performance (some are 100% identical).  These are not defects, that's why you can overclock a $250 CPU to the performance level of a $600 one.  So, why don't Intel just sell every thing at $250.?  Becuse, in a free-world everyone wants more money, right ?   Making as much mony as possible is a business strategy, whether it's a free-world or not, Intel will not sell every CPU at $600 either, it's just a strategy to make more money.

I also found one guy in China selling LifeO4 batteries with 4-year warranty -- two years free exchange , and two years free service.  These are for EV cycle with 800W motors , for 1kw+ motors, the warranty drops to 2 years.  The battery is 48V 26Ah (14kg ~ US$435), that means if you run under 1C, there should have little problem.  All batteries are tested and classify as grade A,B, and C . For grade C, the cost is 1/2~ 1/3 that of Grade A, and the warranty lasts only 3 months.  

I don't know if these are TS's or not (TS LifeO4 is yellow case), but seems to me, the price and warranty is very reasonable, at least in China.  If you run 20kwh pack, the cost would be around US$6~7k. (225.kg), not a bad deal for LifeO4 with 4-year warranty.

If I buy 225kg of battery from some company in the States, and ask them to send it to China, do you think they will provide the same warranty?  For 225kg, maybe not?  Unless, they have a way of knowing you are not running it at 10C constantly.

http://auction1.taobao.com/auction/item_detail-0db1-e685723d1c6ea5b0f2532200628f8ead.jhtml

Cheers,

GOEV

=========================================================

>On Thu, 10 Jul 2008 01:35:54 -0600 (MDT), "Peter VanDerWal"
><[e-mail]> wrote:
>
>
>It's a fallacy to think that one can buy batteries this cheap compared to free
>world manufactured batteries and still get free-world-like quality.  It's not
>a moral issue at all.  It's simply the way the chinese do business and in this
>case, they seem to be open about it.
>
>John
>
>--
>John De Armond
>

[milo0105]

Why do not consider Hipower lifepo4 battery? Compared with our competitors, we have better quality control, 2 years quantity, as well as fantastic BMS system. Now from 10ah to 600ah single cells are available.  

Duff Kindt wrote:

I am ordering batteries directly from Thunder Sky . These will be 90 AH and 160 AH LFP's.  If there is any interest let me know as the larger the order the lower the price.
Sincerely Duff Kindt
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[mark at evie-systems]

Can you send me the specifications for your battery management system, or provide a link where I can download it?

Thanks,

~mark

milo0105 wrote:

Why do not consider Hipower lifepo4 battery? Compared with our competitors, we have better quality control, 2 years quantity, as well as fantastic BMS system. Now from 10ah to 600ah single cells are available.  

[Willie McKemie-3]

On Thu, Sep 25, 2008 at 07:49:00PM -0700, milo0105 wrote:
>
> Why do not consider Hipower lifepo4 battery? Compared with our competitors,
> we have better quality control, 2 years quantity, as well as fantastic BMS
> system. Now from 10ah to 600ah single cells are available.  

I believe the message to which you replied (below) is a couple of
months old.

Several weeks ago, I checked out your website and found it
uninformative.  Checking it again just now, I find the same.  Let me
recommend a clear and simple presentation of your information.  Beware
of flash, java script, and other foofaw.  They are likely to slow
access and limit your audience.  I started loading your site about ten
minutes ago and it is STILL loading.
 
>
> Duff Kindt wrote:
> >
> > I am ordering batteries directly from Thunder Sky . These will be 90 AH
> > and 160 AH LFP's.?? If there is any interest let me know as the larger the
> > order the lower the price.
> > Sincerely Duff Kindt

BTW, did Duff get his order placed?  I have heard of several ThunderSky
orders recently and would like to hear of progress, especially hitches
and lack thereof.  My TS order through Everspring is scheduled to come
into Houston in early October; so far, no hitches except for a very
slight slipping of schedule.

> China Hipower, best lifepo4 producer in China.
> www.chinabatteries.net
> [hidden email]

--
Willie, ONWARD!  Through the fog!
http://counter.li.org Linux registered user #228836 since 1995
Debian3.1/GNU/Linux system uptime  285 days 23 hours 14 minutes

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