Ben, I'm not an engineer but I don't think you can add up the amps in a series configuration. If the batteries are connected in series, the same current flows through all of them at the same time (it doesn't spread out the current load). Think of "a chain is only as strong as its weakest link" - in this case the whole string can only handle 80A amps. If you put 3600 amps through the pack each battery would get that same load at the same time and would fry them all spectacularly!
- Peter Flipsen Jr On Thu, Jul 24, 2014 at 2:37 PM, Ben Goren via EV <[email protected]> wrote: > On Jul 22, 2014, at 8:21 AM, EVDL Administrator via EV <[email protected]> > wrote: > > > For example, the CALB 40ah cells I mentioned are rated for a maximum > > discharge of 2C (80 amps). At 144v, 80a is 11.5kW. Allowing for losses, > > that's only about 12hp from your motor! > > I think I may be a bit confused. > > If a single 40 Ah cell can provide 80 A (for a little while), shouldn't 45 > of those 40 Ah cells be able to provide 80 A * 45 = 3600 A? That 80 A would > be at 3.2 V for 256 W. All 45 cells would be at 144 V, for 518.4 kW or ~ > 500 hp. That's three times the power of the 260 Windsor engine in the car > today, and substantially more than you're going to get in a stock muscle > car of any era -- and waaaaay more than even a pair of AC-50s or WarP 9s is > rated for. > > So...does discharge scale with the number of batteries, or is it limited > by the discharge of a single cell? If the former, I should be more than > fine with a 45-cell pack of CALB 40 Ah batteries or equivalent. If the > latter...I'm likely screwed.... > > Thanks, > > b& > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: signature.asc > Type: application/pgp-signature > Size: 801 bytes > Desc: Message signed with OpenPGP using GPGMail > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140724/f9e034e8/attachment.pgp > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140724/500e1965/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
