Congratulations! Makes me want to change to lithium sooner than later. Presently, I have 18 US125 FLA batteries that weigh about 1,200 pounds, and an old Curtis controller that is limited to about 350 amps. Makes for some ponderously slow acceleration. http://evalbum.com/4331 Sounds like you're having a good time and success with the project!
Tom Keenan On Jul 18, 2014, at 7:09 AM, Zeke Yewdall via EV <ev@lists.evdl.org> wrote: > Update.... and EV grin. I took the VW bug out for the first serious drive > with Lithium last night. WOW. > > Before -- with the 12 volt AGMs. I was getting maybe 280 amps peak battery > amperage on a freshly charged pack, dropping to less than 100 amps after 5 > miles or so. Pathetic performance (lots of driving on the shoulder). > > With the 100AH, 72 volts of CALB lithium, I was regularly getting 200 amps > on acceleration, and I got 370 amps peak once (should probably not do that > too much for the health of the batteries). The alltrax 450 never even got > warm, with it's new heat sink and cooling fan. It's peppy now... way more > than a ICE VW bug. 30mph up hill, and can pull out onto the highway just > fine (highway being the 45mph road -- not 75mph freeway). And... the motor > (6.7" series) is actually running cooler than before as well. I think > because the controller is able to keep the speed up, the motor RPM is not > dropping like it was before, so it's actually cooling better with its > internal fan. And, it takes less time to climb the hill when you can keep > up 30mph instead of 15. After climbing a two mile hill at 250+ battery > amps most the way, it was hot but not too hot to hold onto. I kept it in > 2nd up to about 40, then switched to 3rd for more power on the highway. > 1st is able to peel out in the dirt. I'm sure that driving it like that > doesn't help the efficiency, but it's way more fun that it was as a lead > sled (it's also about 400lbs lighter). One thing.... 50mph around curves > is a little scary... something to do with standard suspension and brakes of > a '73 VW bug.... I only took 20AH out of them, because I don't have the > BMS connected to the controller yet, but this weekend, I'll do a full range > test with the BMS operating. > > Makes me want to get lithium for my Ford conversion. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140719/c281f6ee/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)
