My experience with LiFePO4 is they only show a sag when they are near the low cut off. Pushing them lower would be a asking for trouble if they are not well balanced at the bottom.
I personally think you should stop doing that. At least be sure they are well balanced at low voltages. On Feb 25, 2016 9:15 PM, "Craig M. via EV" <[email protected]> wrote: > > I need some feedback for anyone who has seen the following effects. > > I want the maximum possible range out of my EV but when the battery is > weak (58 miles or so,) acceleration can be a problem. If I hold down the > accelerator pedal too long the voltage drops low. The motor pulls a lot of > current, and the motor may slow down as the battery rapidly discharges. I > have also observed that if the motor stalls, it draws very high current and > the battery is soon fully discharged. To get home on a weak battery I have > had to accelerate in steps or pulses. I would lift my foot off the pedal > for about a second and let the voltage on the battery come back up before > pressing the pedal down again to accelerate. There is an alarm that sounds > if the voltage on any cell is too low or too high. I have an AC-50 motor > and controller with the regenerative feature and LIFEPO4 cells. This may > be playing a role in this effect. I would appreciate hearing from anyone > who has pondered the effects of voltage sag on batteries and motors. I > have asked this same que > stion elsewhere and I got back shrieks of how I am breaking the laws of > physics, motion or thermodynamics. I can't break those laws so I frankly > have stopped worrying about it. I am making observations and trying to > learn from them. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160225/af92877b/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at 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/20160225/d98c6ce5/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
