On Jul 24, 2014, at 9:57 PM, EVDL Administrator via EV <[email protected]> wrote:
> I think Ben G can build this car. However, I'm not sure he's going to get > absolutely everything he wants (range, power, price). > > As with so many other things : go far, go fast, go cheap : pick two. :-\ I'd love to pick just two! Sadly, it looks like "go fast" is coupled to the other two.... Thanks to the people here, I've spent a lot of time today so far searching and crunching numbers and the like -- dozens of batteries from half a dozen vendors and as many manufacturers (including CALB, Enderel, GBS, and more). I'd appreciate if somebody can check my math on the current leading candidate. It's a Voltronix 3.2V 60Ah 8C cell that EVWest sells for $78 / ea: http://www.evwest.com/catalog/product_info.php?cPath=4&products_id=266&osCsid=ph57045uael6qb57sjjaqi8cs3 If I have the math right, if I were to connect 45 in series, that would make a 144V 60Ah cell. Three of those in parallel would make a 144V 180Ah battery capable of 1440A discharge and thus 207kW power with a total capacity of 26kWh...at a total cost of $10,530 and a weight of about 750 pounds. Does that math sound reasonable? That's twice the capacity I need, which obviously in and of itself isn't a bad thing. But that's over twice the cost I had previously been guesstimating -- and doesn't include a BMS or charger or the like. And it's a *lot* of weight. But if I cut back on the number of cells, I cut back on either voltage or amperage (or both).... It looks like a GBS system in a kit with BMS and the like would likely get similar performance with half the capacity and a third the weight...for twice the money. Enderel looks to be about comparable to GBS but maybe lighter and more expensive still. So...um...am I missing anything? Thanks again, everybody. 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/20140725/b2482853/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)
