Accelerating Hard in an EV More Wasteful? Is accelerating hard in an electric (or any, for that matter) vehicle any more wasteful than accelerating slowly?
My flimsy grasp of physics suggests that it shouldn't be. The energy required to accelerate the mass of the car to 30mph is the same regardless of how long it takes; it's just that the use of energy is spread out over different time scales.
Assuming that the motor is as efficient at converting electrical energy into kinetic energy in the drivetrain at all power outputs, are there any other factors that mean it's more energy-efficient to accelerate slowly? For instance is wind resistance a factor?
Clearly one doesn't want to accelerate to a greater speed than is required, and one wants to decelerate as slowly as possible in order to engage regenerative braking, and in the hope that obstructions have cleared by the time you get there.
I guess my question comes down to: can I make driving more fun by always flooring it off the line?
 A: The EV efficiency goes down very quickly with power output as $I^2R$ losses are mounting in the motor, the wiring, the power electronics and the batteries. Since an acceleration phase can only be so long (10-20s) and the car will not be used with constant velocity changes (unless it is designed for racing), the entire design will be optimized in such a way that the heat capacity of the materials will be able to absorb one or two consecutive acceleration cycles at max. power output. Beyond that the controller electronics will go into a thermal limiter mode to prevent damage to the motor, batteries and electronics until the cooling system can remove the excess heat. This also means that at the highest power output the system can be fairly inefficient (I would gestimate less than 70% or even 60%). In normal mode the EV will need less than one third of the peak current, which means that losses are an order of magnitude less. So even if, at peak, 40% of the energy is lost, during normal operation (constant speed) the system has roughly 4% losses. In essence, fast acceleration in an EV can waste quite a bit of energy.
A: I found this article where someone has actually done an experiment https://cleantechnica.com/2018/04/16/how-ev-range-is-affected-by-quick-acceleration/
Conclusion: "The state of charge on the first day on my return was 33%, and the state of charge on this next day on my return was 40%, making a difference of 7% in the state of charge over a 30-mile journey."
so yes, accelerating fast does use more energy overall.
