- Solar Challenge 2 time winner - 2009, 20011 - Tokai Challenger - 62 mph average for Solar Challenge Winner- 1.8 kW PV array, 30% efficient, 352 lbs, 16'7" by 5'5" - . 90 square feet of area.
- Increase that to 24 feet long x 8 feet wide (192 square feet) (2 kw) - like a trailer - to double the area. Use non-exotic solar panels to keep cost reasonable with solar. Add 20 kg of lithium ion batteries for 4 kWhr  of power, and a small backup engine (2kW) - for one hour of up to
- PV panels - 1650x990 cm is 17.5 sf. See slide 12 of Open_Source_PV_System#Initial
- 11 of these panels fit on the 192 sf area. Each is 285 watts for 3100 W total. Under normal conditions - power should be 1.5kW. If we double that with an internal combustion engine for 3-4kW - we are pretty good to go for sppeed.
- The main challenge in using Open_Source_PV_System#Initial PV panels is that they weigh 19kG each - so 209 kg total. That is 460lb already. Small engine would be 5 lb, and batteries at 44 lb - with frame + drive at 240 more lbs. That makes for a 750 lb vehicle.
- Can we get frame to within 240 lb? Yes, with carbon fiber composites. But aluminum would be tough. Suggestion: 3D printed frame as skeleton for carbon fiber layup.
- Frames - carbon fiber is 5x less weight than steel frame, and 2x less than aluminum. 
- For a practical 200mpg equivalent solar car for OSE, we can think of a box truck with a roof to carry 20 solar panels, 2 2kW silent generators for auxiliary power, and open source electric motors. It would also have a 1Kw battery pack from r rapid acceleration,such as 20kW boost for 3 minutes.
- Solar power would be on the 24x8 foot roof - 200 SF for 3kW of power. There would be telescoping extensions to double power to 6kW for cruising speed.
- It could potentially telescope to 9kW total when standing for rapid charge, but this may not make much sense if small size and small battery pack are used. $1k gets us up to 3.3kW of battery storage.
- This would be quite the vehicle with battery, solar, and wood gas.
- Carbon neutral, unlimited range.
- Curb weight of 1000lb with plastic fiber composites that are 3D printed.
- 120lb generator for 3 running kW
- 3kW panels (30 panels) weigh 96 lb.
- Structure - 500 lb
- Motors - 100 lb for 2x10kW running power
- Batteries - 15 kg for 3kW
- 9 running kW - 40kW peak for 30 seconds
- 3D printed airless tires
Specific Case 1 - Telescoping 32' vehicle
- Vehicle lengths in the USA are typically 65' 
- Vehicle telescopes, so it has a a normal length of 20' (size of a van) to 30'.
- This is 8x65=520 square feet, or 48 sq m.
- Take a Sunelec panel -  - Heliene 300 - 65.5 × 39.4 in - for 300w. . 2581 sq in or 1.67 sq m. This is 180W/sq m.
- There are 29 solar panels in this area.
- 48 * 180= 8.6 kW
- Thus, a large trailer would have a total energy capture of 8.6 kW (11.5 hp)
- This is plenty for driving on flat land.
- Typical rolling resistance is 1.5 hp for 1000 lb of vehicle. . We can allow for a 2000 lb vehicle to make this easy.
- Each panel is 50 lb . 29 panels make it 1450 lb - leaving only 550 lb for everything else - which is difficult. There is a strong case for flexible panels that are 82% lighter . In which case the structural engineering is easily doable without extreme performance design.
- Flexible panels are not as durable.
- Case exists for a heavier vehicle with stiff panels.
- Say 3000 lb weight - but that gets into pushing too much mass around. Doable. With 11.5 hp available, 4.5 goes to resistance, and 7 hp to drive (5 kw).
- There would be a 20kW auxiliary battery pack for added power.
- All together, this makes for an interesting city vehicle that can also be designed for highways.
- A telescoping vehicle is one route to try, and it is definitely a viable idea.
Case 2 - Non-Telescoping 21' Vehicle
- 2.9kW power. 21'x8'= 168 sf.
- Low-rider back with panels - 10 panels - 500lb
- Total vehicle weight - 1000lb
- Onboard hydrogen compression plant - trickle compressor, runs all day.
- Storage - see Hydrogen Storage