First, I started with a graph from Tesla of battery consumption versus speed. Unfortunately that graph only went up to 80 mph, so I had to extend it (yes I know that exponential is probably not exactly correct, but it's close).
Having that data, I needed to make some assumptions about the Superchargers. If they are 120 KW, they can charge an 85KWH battery in 0.708 hours. Sure, I know it would take much longer than that because the last 20% of charge is slow, but I'm just trying to get a rough estimate here.
So with some simple math, we can figure out the "running time" and the "charging time" and compute an "aggregate MPH".
Running | Charging | Total | ||||
Speed | range | Time | Time | Time | Agrregate | |
miles/hour | WH/miles | (miles) | hours | hours | Hours | MPH |
10 | 220 | 386 | 38.6 | 0.71 | 39.34 | 9.8 |
15 | 195 | 436 | 29.1 | 0.71 | 29.77 | 14.6 |
20 | 190 | 447 | 22.4 | 0.71 | 23.08 | 19.4 |
25 | 190 | 447 | 17.9 | 0.71 | 18.60 | 24.0 |
30 | 195 | 436 | 14.5 | 0.71 | 15.24 | 28.6 |
35 | 200 | 425 | 12.1 | 0.71 | 12.85 | 33.1 |
40 | 215 | 395 | 9.9 | 0.71 | 10.59 | 37.3 |
45 | 225 | 378 | 8.4 | 0.71 | 9.10 | 41.5 |
50 | 245 | 347 | 6.9 | 0.71 | 7.65 | 45.4 |
55 | 265 | 321 | 5.8 | 0.71 | 6.54 | 49.0 |
60 | 285 | 298 | 5.0 | 0.71 | 5.68 | 52.5 |
65 | 315 | 270 | 4.2 | 0.71 | 4.86 | 55.5 |
70 | 340 | 250 | 3.6 | 0.71 | 4.28 | 58.4 |
75 | 365 | 233 | 3.1 | 0.71 | 3.81 | 61.1 |
80 | 400 | 213 | 2.7 | 0.71 | 3.36 | 63.2 |
85 | 429 | 198 | 2.3 | 0.71 | 3.04 | 65.2 |
90 | 463 | 183 | 2.0 | 0.71 | 2.75 | 66.8 |
95 | 501 | 170 | 1.8 | 0.71 | 2.49 | 68.0 |
100 | 542 | 157 | 1.6 | 0.71 | 2.28 | 68.9 |
105 | 586 | 145 | 1.4 | 0.71 | 2.09 | 69.4 |
110 | 633 | 134 | 1.2 | 0.71 | 1.93 | 69.6 |
115 | 684 | 124 | 1.1 | 0.71 | 1.79 | 69.4 |
120 | 740 | 115 | 1.0 | 0.71 | 1.67 | 69.0 |
125 | 800 | 106 | 0.8 | 0.71 | 1.56 | 68.2 |
130 | 865 | 98 | 0.8 | 0.71 | 1.46 | 67.1 |
That puts the optimal speed (in a time sense) at an impressive 110 mph. Realistically, optimal speed will probably be a slower than that due to charging issues.
Unfortunately, the aggregate speed is only 69 mph considering the charging time. It will mean driving for 1.2 hours and then charging for 0.71 hours. That might be slightly painful.
The only thing worse, would be to go for optimal efficiency and drive at 25 miles./hour which would be 17.9 hours of driving and 0.71 hours of charging. Bathroom break anyone?
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