On Sun, Jun 9, 2013 at 12:13 PM, Lee Hart <[email protected]> wrote:
> On 6/8/2013 8:17 PM, Lawrence Rhodes wrote: > >> I've checked out some Chinese battery suppliers and seems prices are >> around 100 >> dollars a cell. A 144v pack will be 45 or so cells. Should yield a 50 >> mile >> usable range on the Ford Aspire. What is the best supplier and battery >> for the >> money? Could a regular K&W work as the charger? Trying to do this on the >> cheap. What is the best bargain in BMS? I've been into lead so long I >> need >> advice on the best way to go on lithium. The 144v system draws 500 to >> 700 amps >> max. Lawrence Rhodes >> > > It's really hard to get a "best buy" recommendation, because most people > only buy one pack, one time, from one supplier. They don't do much testing, > either; it's just put 'em in a drive! > > Since you're talking Big Money for a lithium pack and all it's attracted > complexity, maybe it would be good to dip your toe in the water first. Do > you have a smaller EV you could convert first? A motorcycle or lawn tractor > or something? > > Another thought is to replace just a few of your lead-acids with lithiums. > Maybe replace a 12v 100ah battery with 4 100ah lithiums? Charge them > separately, with a small charger/BMS system. Add some instrumentation, so > you can watch the current and voltage sag relative to the lead-acids, and > see if they are better or not. > > If your first candidate turns out not to be that good, try some different > ones. You aren't out much money, and the old ones will still be a good 12v > battery to use in something else. > > Does this violate the balanced battery pack doctrine? It would be interesting to see how that pack fared against the rest of the pack and it wouldn't take much more effort to instrument them from inside the cab. Just run a couple of $4.00 volt meters into the passenger compartment. sean -- Sean Korb [email protected] http://www.spkorb.org '65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382 "The more you drive, the less intelligent you get" --Miller "Computers are useless. They can only give you answers." -P. Picasso -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130609/ba594389/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)
