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.
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