Repeated, yes. But you want to have the torque available when it's needed. That may be only when entering the freeway, in which case there is no appreciable stress on the batteries, but it makes the car a lot safer than if you can never get up to 60 in less than 15 seconds!LTLFTcomposite wrote:Won't repeated hard acceleration stress the battery pack, generating more heat? I was under the impression the way to get the most life out of the battery was to baby it... slow charging, slow discharging. That's how it always worked with my RC cars!
Wow! That was one of the best articles I've read so far. Thanks!sjfotos wrote:Not sure this is accurate, but according to this story, the 0-60 mph time is about 8 seconds...
http://www.optoiq.com/index/lasers-for- ... 14327.html
This runs counter to my experience with my Zap Xebra and also counter to my experience with my electric Porsche (during the short time I was driving it -- long story). Flooring the go pedal does seem to shorten range if it is done frequently. My point above was that if you have the capability you need not use it, but if you lack the capability you can never do it.KarenRei wrote:Re, energy used for hard accel:
1) Motor efficiency varies, and it's hard to make any generalizations. Depending on the situation, a high torque accel may actually be *more* efficient than a slow one. Or less. You need the brake-specific energy consumption data for the powertrain.
2) Battery pack efficiency does drop with increased currents, but for li-ion, that drop is very small.
3) In terms of energy used, the laws of physics don't care whether you go from 0-60 in 2 seconds or 20 -- excepting that in 2 seconds, you'll have 18 more seconds of the sort of aerodynamic drag you get at high speeds
So really, sharp accel should have minimal impact on your net energy consumption in a li-ion EV (lead-acid being a different story). Now, when it comes to *braking*, that's altogether different. Even with regen, you still want to minimize how often you brake. So if accelerating hard means you'll also be braking more, than *that* will hurt your range. But accelerating hard then coasting down? Don't worry about it.
Exactly. Assuming that the available power and capability of the motor can give you a 0-60 of 8 sec., Nissan's testing might show that "normal" drivers tend to accelerate hard enough that it has a negative impact on real world range. Negative press about range could kill this car before it gets started. If reports start surfacing of people running out of juice at 60 miles Nissan will have a serious problem after "promising" 100 mile range.Dav wrote:Remember too that all this is done electronically. What the car is theoretically capable of may not be how Nissan releases it.