Hi David, Yes, that is correct. I used to see higher currents and better acceleration at low speeds.
When I'm pulling 60A from the batteries, I will see a drop from about 147V to about 142V. When I'm pulling 100A from the batteries, I will see a drop to about 139V. When I'm pulling 150A from the batteries, I will see a drop to about 135V. Those are all current conditions with the batteries a little on the cool side. The drop will be a little less as the weather warms up. Because of the temperature and a couple of weak cells, I don't really expect to get more than 150A. It would be really helpful to get closer to 100A off the line, though. I probably should clean and check all connections. That is a good idea. Mike > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of EVDL Administrator > Sent: Saturday, March 08, 2014 11:12 PM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] Performance Issue > > So you're saying that you used to see higher currents and better acceleration > at low speeds? Yes? No? > > Bill had some good thoughts. Also, have you checked all the cells under load, > to make sure that each one is doing its part? > > I know nothing about the Kelly controllers except what I read, which is that > they're not exactly top shelf products. This may not apply, but I remember > the old PMC DCC range of controllers which, if I'm not mistaken, used the E/C > junctions of the bipolar power transistors as shunt resistors for the current > limit. As the transistors aged, their E/C resistance rose, causing the controller > to limit at lower currents (and causing acceleration to weaken). A few > owners tried cranking up the limit control in response. Not too surprisingly, > they fried the power transistors. > > David Roden - Akron, Ohio, USA > EVDL Administrator > _______________________________________________ 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)
