Acceleration vs Mileage in Electric Cars

Yes, it all about the power being used.

The same rules apply for both types of propulsion.

Driving like a raw egg is under your foot always results in increased range.

Yes, Hard acceleration and hard acceleration and braking. braking waste more energy as heat than gradual use of the same forces. Battery internal resistance losses are greater with higher current uses - these are irreversible losses.

With the Tesla, regenerative braking is used for all gradual braking -using the motors in reverse to generate DC which is returned to the battery. Above a certain braking intensity , both friction and regeneration are used. Hard acceleration, braking and cornering also wear away more tire rubber.

Tesla cars and electric cars in general may have a life of 10-20 years if they are built to minimize corrosion mediated frame and body losses - which are the ultimate limits on the economic life of a car.

Electric motors can be made with 100,000 hour lives. Gasoline cars rarely last more than 5000 hours of operation - with exceptions, like taxis, whose engines are usually maintained hot 24/7, via shifts and who often have weekly oil and filter changes.

for Tesla data

you might look here

you tell me

https://www.youtube.com/watch?v=RWQ-dnpplaA

I think high acceleration will decrease the efficiency of an electric vehicle, but I see the point of your question. With either ICE or an EV, the power primarily goes toward the kinetic energy of the vehicle, which cannot be recovered by an ICE. However, the energy recover is far from perfect in an EV, with the inefficiency primarily being due to charging the battery. One main advantage that an EV has is the electric motor can produce torque at zero RPM, where a transmission is very inefficient. For a simple quick start, the hit on efficiency should be much less for an EV. If you're talking about racing around town, then other losses (I²R losses in the conductors, windage losses at higher speeds, any loss due to the tires skidding, switching losses in the power electronics, lower efficiency due to the motor and power electronics being hotter, etc.) increase and cannot be recovered.

My DIY EV has about 860 mOhm battery pack internal resistance. That includes all wiring, cell internals etc. It's a 600 VDC pack.

On colder weather it increases to 1 Ohm - so lets use 1 Ohm.

At 60 km/h I cruise at about 10 Amps. My I2R losses are therefore 10*10*1 Watts - 100 W, pretty good (I'm using about 6 kW in that example).

Flat out acceleration pulls about 93 Amps. 93*92*1 - so just shy of 8700 Watts.

Battery pack voltage has probably dropped to 550 V so 51 Kw with around 8.7kW losses. That's power I won't recover with regenerative braking either.

With gentle acceleration (20 Amps) I recover around 70% upon slowdown (mainly mechanical losses) provided I don't use mechanical brakes. Of course every bit of energy in maintaining cruise speed is always lost.

Does that help?

http://electricvogue.blogspot.com

Interested to see what your internal resistance is. What type of battery are you using? Li-ion batteries are said to have a higher internal resistance than convention lead/acid, NiMH and Ni/Cd. I'm always reading about battery chargers that will recharge an electric vehicle in 5-10 minutes, implying currents of something like 600 Amps, so the losses at an internal resistance of 1 ohm would be a staggering 360 kW - enough to heat a cathedral and all landing up in your car battery. That's why I view those claims with great skepticism.

Yes, more like about 30 minutes to 80% charge. That would make the charge rate for mine about 35 Amps which is a reasonable loss. The rate of charge is indeed related to the pack's internal resistance.

The cells are LiFePO4 - Lithium Iron Nanophosphate. 384 10AH cells arranged as 192 cell pairs. Brand is Headway, model 38120S.

Better cells would have delivered lower internal resistance but would have cost 2 to 3 times as much. I have 500 cycles up on this pack now with no measurable degradation.

Dear Mr.ronseto,

The answer for your question is Yes.

While we accelerate the Force is increased as per the equation F = m x A

where F = Force, m = mass to be accelerated and A = the acceleration. which means energy is consumed.- at a rapid rate.

DHAYANANDHAN.S

Show me a gallon of electricity, Mildred.

Mildred told me to tell you it used to be a full gallon...

My guess is that the loss of efficiency with heavy acceleration is mainly due to the losses incurred in braking. A gasoline engine may be less efficient accelerating than running at a constant speed, more so than an electric motor. If you have regenerative braking, you can retrieve part of the braking energy.

So I would say the same rules applies to an electric vehicle, although not as strongly as to an ICE vehicle. The optimum economy would be to accelerate just enough overcome frictional losses and have minimum braking.

Agreed. Have logged evidence to support as well.

Rate of change of potential energy is power. The harder one pushes the go pedal, the more power is required to reach the velocity setpoint. The harder one pushes the slow pedal, the more power is wasted at the brake components. The quicker one gets from one set of lights to the next red, the higher the frequency of consuming that power, and the quicker the on-board store will become depleted.

The rest is embraced by the principle of Conservation of Energy.

So when you accelerate, you add kinetic energy. When you brake, you throw that energy away. So to conserve energy, accelerate just a little so you're going really slow, just don't do it when I'm behind you!