The selling points for me:
Continuous range (some of us aren't millionaires with 30 more hours to add to an already long trip. If I am driving 12 hours to a destination, solar isn't going to cut it on a 700 mile trip)
Tires. Where's the spare? How much are tires? How do you intend to change them?
Price. Can you keep it comparable to a 2020 Prius in price AND outrange a prius with better gas mileage? If not, you are wasting my time.