I have doubts that the good Cx can compensate for the weight which seems heavy (how much with dashboard, big doors, big wheels, etc ?) with approximately 600 Wp of solar panels, to reach the indicated performances, autonomy and speed. I drive a solar Waw velomobile (60 kg with 480Wp)
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Interesting discussion. First, allow me to point out that while I'm a big fan of Aptera Motors, I don't work for them and don't have any "inside info". I'm just using the numbers and info they have made public.
So your velomobile goes 6 times further on the same amount of energy. Very good!
A few corrections on your assumptions...
(1) Aptera solar panels actually output 700 watts peak. That is real life, in the actual curved configuration of the panels on the vehicle. Of course, that is on beautiful, sunny SanDiego, CA day, and your weather may vary. But they actually can do that. (Sometimes.)
(2) The 10 miles/KWH mileage is based on 3D drag simulations and known information about the electronics and motors.
(3) That mileage is also based on the combined EPA test cycle of acceleration and deceleration and times at various speeds, designed to simulate both city and highway driving, at speeds up to 70 mph. So if you drive an Aptera slower and more gently than the EPA test cycle, you should use even less energy per mile. (The EPA test cycle is done on level ground and in still air.)
(4) One of the simulated assumptions is how efficient the regenerative braking is at capturing the vehicle's kinetic energy and converting it back into stored energy. I remember reading that the Aptera electronics and motor are particularly good at that, though I don't have that number now. I remember it is well above the 50% that my Chevy Volt claims with its much worse aerodynamics and weight, so that makes a big difference.