Nik
Got there eventually :-)
I hope they use wireless charging, because a wall-wart charger with a 2-inch thick cable isn't going to be very portable.
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I hope they use wireless charging, because a wall-wart charger with a 2-inch thick cable isn't going to be very portable.
I don't think that would be necessary. A regular (US) wall socket is 110V/15A, from which you're allowed to draw 12A continuously, or about 1.3kW. Doing that uses an ordinary size wire (think of the wire on 1.3kW hair dryers, for instance). I just looked, and the batttery in my laptop claims to hold 73 Wh, which at 1.3kW would take between three and four minutes at 1.3kW, even if you make some allowance for charging inefficiencies.
Norbert
TSLA will win
Not sure if anyone saw this article in Wired (Video: Crazy Genius Charges EV by Towing It | Autopia | Wired.com) about a guy that recharged half the battery in his Leaf in just 10 minutes but towing the car and using the regenerative braking (he had to slightly press the brakes to engage the regenerative braking):
"It’s a tricky maneuver, because depressing the pedal too far engages the brakes, but if you use just the right touch, the regenerative braking will send energy to the pack. Everts got the pack up to 73 kilometers of range, about half of its capacity, within 10 minutes. The downside, however, is the car’s sophisticated energy management system had no clue what was going on, and there are probably all kinds of warranty implications."
As the article points out, the PEM may have freaked out but why would this recharge the batter so quickly? Could companies install rigs to spin the wheels to do something similar for quick charging (instead of having to plug the car in)?
"It’s a tricky maneuver, because depressing the pedal too far engages the brakes, but if you use just the right touch, the regenerative braking will send energy to the pack. Everts got the pack up to 73 kilometers of range, about half of its capacity, within 10 minutes. The downside, however, is the car’s sophisticated energy management system had no clue what was going on, and there are probably all kinds of warranty implications."
As the article points out, the PEM may have freaked out but why would this recharge the batter so quickly? Could companies install rigs to spin the wheels to do something similar for quick charging (instead of having to plug the car in)?
JRP3
Hyperactive Member
Regen just uses the motor as a powerful generator putting out hundreds of amps, you could use something to spin the wheels and charge the pack, but it would be an inefficient system.
Yeah but aren't gas engines only 20% efficient as well? What I am thinking is you should plug at home and get your 80% efficiency off the grid but if you are going long distance you can stop and get just-as-efficient-as-gas quick charging via wheel rotation instead of plugging in. So you trade efficiency for speed in this particular case. This would just to be able to let people go long distances without range anxiety but people would still do 99% of their charging at home.
JRP3
Hyperactive Member
Important study we can use to counter those who think there aren't enough resources to make EV batteries:
Green Car Congress: Study finds resource constraints should not be a limiting factor for large-scale EV battery production
Green Car Congress: Study finds resource constraints should not be a limiting factor for large-scale EV battery production
I think we'll be ok for a while.
"Tesla: The Battery Technology Behind the Wheel":
http://asia.stanford.edu/us-atmc/wordpress/wp-content/uploads/2010/12/ee402s-04022009-tesla.pdf
http://asia.stanford.edu/us-atmc/wordpress/wp-content/uploads/2010/12/ee402s-04022009-tesla.pdf
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