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neptronix
Portland, OR
2 wheeled Menace.
Interests: Electric everything, mostly bicycles..
Recent Activity
Gee, if i had solar panels and wind generators on my roof i'd just be turning that electricity into..... electricity! forget the intermediate H2 step. Battery tech continues to improve and energy density is going up year by year. I'll place my bets on EV...
Someone mentioned the range of a nissan leaf dropping to 19 miles in winter temps.. That seems unlikely, all winter tests i've seen show that the battery range cut is more like 1/2.. Anyhow the fault is the Leaf's battery pack. It is not designed to heat itself; which is extremely short sighted in my opinion. A car's battery pack can be heated with less than 1000 watts; less than a tenth of the energy the car uses cruising on a flat, to get 50% more battery power... !! Why Nissan left this feature out is absolutely beyond me. Perhaps rushing the car to market to get a tax credit ?
That means they can use a smaller alternator, or less alternator load.. That means you get more power out of the engine, and the pump would also last longer. You'd think this would already be implemented by now. hm.
Lol.. my electric bicycle has more KwH than this. Can't be a very large or expensive battery.
To those wondering why a CVT would be a good idea.. Go on google images and search for 'electric motor efficiency curve'. You will quickly find that efficiency at lower RPMs is terrible, and on some motors, higher RPMs also. In addition to that, torque dropoff after the middle of the RPM range becomes terrible as well. A CVT transmission would keep a motor at an ideal RPM, in order to maximize efficiency at low and high speeds. It would also allow a higher top speed from a smaller motor, as torque dropoff can be managed by spinning the motor at mid-RPM. The gain in efficiency would mean that less amp hours would be used to do the same job. Yes, fallbrook needs to figure out how to get regen working. But this is a big deal as ordinary transmissions often can't handle this kind of power..
Way cool. I believe a transmission is one of those missing links to make an EV more affordable and efficient. If they can cut the power requirements by 20% with a CVT transmission, that means smaller motor, less batteries, smaller controller, all to do the same job... that means cheaper car.. Good on fallbrook for taking the next logical step. The future looks bright for them.
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Feb 24, 2011