Concept

Solar/human hybrid, practical 35 mph cruising, 45 mph noon max speed
8 foot by 16 foot body, 1 kW of solar panels, flexible panels at 4 lb/100W
Panels are close to ground for good wind stability.
Light weight, aluminum frame
According to Cycling Power and Speed Calculator - 500W take you 25 mph with a 300 lb vehicle.

Worst case scenario from calculator is 0.02 rolling resistance, 16 sf frontal area, and drag coefficient of 0.6 - which still gets you to 22 MPH with no engineering required. Just by using mountain bike tires, open cab and no aerodynamics - 1kW of solar + pedal power gets us 22mph. With a 1 kWhr battery pack, we still get 30 mph. Thus, solar NEVs (solar neighborhood electric vehicles) or SUVs - Solar Utility Vehicles - are completely feasible. With an on-board 1 kw generator - we get 35 mph at a total of 3kW of power. When designed for aerodynamics and drag, we get 65 mph in this case.

Discussion

~~Use 300W panels - dimensions of 1650x99ox38 mm panels~~
Neighborhood hybrid human vehicle, capable of 45 mph max, 35 cruising at 1000W/m2 sun.
Telescopes for more power, from 16' to 30'. 8' wide. 9.14 m x 2.4 m. For untelescoped - 4.9m
16' is the length of a mid-size car
Bottom-monted panels for low center of mass in windy conditions
~~19kg per panel above~~ - too heavy
Flexible panels - lighter - [1] - $1/watt for 200W, 109x80x3 cm
Flex panels are 75% lighter. Ex - 100W is 4 lb. Makes sense. [2]
This is great news for the solar car. Just need to mount them in an effective way on the car.
Can fit - 2 across and 11 long for telescoped, and 6 untelescoped. 22 and 12. Subtract 2 for the driver - so have 20 or 10 panels - ~~or 2 kw in the extended form.~~. Each panel is 200W - so it is actually 2kW peak for the short form and 4 kW for the long form!
Can fit a silent Honda EU1000 or 2000 1kW or 2kW generator for backup.
Basic weight: 4 lb x 20 = 80 lb for panels. 10 kg motor. Capacitor bank or 5 kg of batteries (1kWhr) - light weight for extra power, pumped by human generator for passing. 5 minute human generator at 100W yields a 2kW boost every 5 minutes for 15 seconds of passing power.
Cycling Power and Speed Calculator - power to attain a certain speed on a bicycle, given frontal area, air drag, and wheel friction