Hi. New guy here.
I have an electric car with a maximum range of 63 miles. I need some feedback from 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 battery 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 question elsewhere and I got back shrieks of how I am suffering from the effects of an illusion or that 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 to make my electric car better and to make my understanding better.
I have an electric car with a maximum range of 63 miles. I need some feedback from 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 battery 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 question elsewhere and I got back shrieks of how I am suffering from the effects of an illusion or that 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 to make my electric car better and to make my understanding better.