4 ms·

Kinetic energy increases at the square of velocity - so a 4400 lb car, accelerating from 64 MPH to 65 uses 7.25 KW, while going from stopped (0 MPH) to about 7

Kinetic energy increases at the square of velocity - so a 4400 lb car, accelerating from 64 MPH to 65 uses 7.25 KW, while going from stopped (0 MPH) to about 7 MPH uses slightly more, 7.75 KW. It takes additional energy to add energy to a system that already has some energy. For example, recharging a partially-full battery from 70% to 90% will take more energy (or time) than charging from 5% to 25%. At 65 MPH, it takes my Camry Hybrid over a second to absorb 1 MPH and reduce to 64 MPH, with only regenerative braking. At 35, it can absorb several MPH per second. Like a Tesla, the regenerative braking is always slowing the car down, but unlike a Tesla, it only regenerates at 5%-10% until the brake pedal is pressed, which is reflected by the "tachometer" dipping down into the blue CHG section.

davidgould 8y ago
> a 4400 lb car, accelerating from 64 MPH to 65 uses 7.25 KW My Chevy Spark EV can regenerate at up to 60 KW. Forward drive tops at 100 KW. The regen limit is due to the battery charge rate, the bigger the battery, the more charge it can accept. > It takes additional energy to add energy to a system that already has some energy. For example, recharging a partially-full battery from 70% to 90% will take more energy (or time) than charging from 5% to 25% Why do you say "additional energy"? Do you mean "additional time", because that makes some sense as DC quick charging usually tapers off in rate as the battery becomes full. Please explain this if you actually mean additional energy as it is confusing.