Tesla's battery expert has published results on new battery cells that might last 3 or more times as long as current batteries
published by a team including Jeff Dahn, the physics professor from Halifax who is often called Tesla's battery guru. The claimed results suggest a cell with a lifetime of 6,000 cycles. This would translate in a large pack car to the"million-mile battery" which Elon Musk has predicted for Tesla.
At 200 miles/day, a car would rack up a million miles in just over 13 years. A taxi with a more normal 250,000 mile life is worn out in 4 to 5 years. If you can make the vehicle last that long, you seriously reduce the depreciation part of theand thus reduce the cost of a ride, since today depreciation is the largest cost factor in operating a car. Depreciation of the battery has been one of the largest costs of operating an electric car.
If your choice is to put in a 200 mile battery into the taxi, and recharge only when power is cheapest, or put in a 100 mile battery and charge mid-day when power is expensive, the math points to the 200 mile battery, except on the question of space. When power in the day starts costing a similar price to power at night, another resource becomes important -- charging stations, especially fast ones. It might be wasteful to have a charging spot only be in use at night, so with low cost daytime power, you can and should make use of it most of the day. On the other hand, if a charging station is really just a parking spot with a box on the ground, it can be utilized as parking during the day, and charging at night.
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