This post shows absolutly no scientific thought at all The standard for calculating solar efficiency in the us is PVwatts you have to use it for every applications to all 50 states and FED. https://pvwatts.nrel.gov/ So lets take a car whose Horizontal surface are is 6 ft x18 Ft. = 108 SQ Feet. I doubt you could ever get this much panels on a car but lets assume you have a big panel mounted over the car. a top of the line commercial solar panel delivers about 20 W per square foot under test lighting conditions. So you will have about 2100 rated watts from this array. Now lets locate it in an open space near Phoenix AZ with panel mounted at the prefect angle and azimuth for collecting power not moving and driving. Go to Pv watts and see what yearly production would be. It is 3,584 KWH per year. Total system loses is calculated at 14% which is better than Average. So with every angle prefect why don't you look at the specs for the car you posted and tell me how many miles it can go on 365 days of parking with every angle prefect.
Now lets look at how much location effects it. I will go to ND US which is flat and does not have much bad weather Yearly out put drops to 2.508KWH about a 30 % drop just by changing location, from Sothern US to Northern US. How far will your car go with this much yearly charge.? Simple fact is that Car mounted solar arrays sound sexy and seem great to the uniformed user. they lose efficiency when moving and even if every thing is prefect they just do not add that many miles
Below I have copied the spread sheet data for both locations I used. i think if you put some thought into it you would realize just how crazy your statement is. " I think there are potentially EVs in the future for which the only power will be onboard solar. " you should think a little harder before making statements like this. think hard before saying that panels will get more efficient. they will but by how much without a non Siicon bassed technology. Here is a good place to start https://www.science.org.au/curious/technology-future/solar-pv
Data for outside Phoeniz AZData for north Dakota.
PVWatts: Monthly PV Performance Data 1 Requested Location: Phoenix AZ 2 Location: Lat, Lon: 33.45, -112.06 3 Lat (deg N): 33.45 4 Long (deg W): 112.06 5 Elev (m): 321.1199951 6 DC System Size (kW): 2.1 7 Module Type: Standard 8 Array Type: Fixed (open rack) 9 Array Tilt (deg): 20 10 Array Azimuth (deg): 180 11 System Losses: 14.08 12 Invert Efficiency: 96 13 DC to AC Size Ratio: 1.2 14 Average Cost of Electricity Purchased from Utility ($/kWh): 0.12 15 Capacity Factor (%) 19.5 16 17 Month AC System Output (kWh) Solar Radiation (kWh/m^2/day) Plane of Array Irradiance (W/m^2) DC array Output (kWh) Value ($) 18 1 241.418396 4.89126873 151.6293335 251.5185089 28.87 19 2 250.091156 5.60833073 157.0332642 260.72229 29.91 20 3 325.0750122 6.74118233 208.9766541 338.7998657 38.88 21 4 352.874939 7.62141895 228.6425629 367.907196 42.2 22 5 362.032135 8.00974751 248.3021851 377.2642212 43.3 23 6 346.5774231 8.07658291 242.2974854 361.4554138 41.45 24 7 330.0576782 7.36761761 228.3961487 344.0881043 39.47 25 8 318.9407959 7.11608744 220.5987091 332.5771179 38.15 26 9 300.7164002 6.92431927 207.7295837 313.533905 35.97 27 10 290.367981 6.27030087 194.3793335 302.4472351 34.73 28 11 239.7496338 5.08195162 152.4585419 249.8726807 28.67 29 12 226.2647705 4.49571657 139.367218 235.7645111 27.06 30 Total 3584.166321 78.20452454 2379.81102 3735.95105 428.66
PVWatts: Monthly PV Performance Data 1 Requested Location: 45 - 111 2 Location: Lat, Lon: 48.65, -78.42 3 Lat (deg N): 48.65 4 Long (deg W): 78.42 5 Elev (m): 318.519989 6 DC System Size (kW): 2100 7 Module Type: Standard 8 Array Type: Fixed (open rack) 9 Array Tilt (deg): 20 10 Array Azimuth (deg): 180 11 System Losses: 14.08 12 Invert Efficiency: 96 13 DC to AC Size Ratio: 1.2 14 Average Cost of Electricity Purchased from Utility ($/kWh): No utility data available 15 Capacity Factor (%) 13.6 16 17 Month AC System Output (kWh) Solar Radiation (kWh/m^2/day) Plane of Array Irradiance (W/m^2) DC array Output (kWh) Value ($) 18 1 130177.4297 2.24738312 69.66887665 136488.1563 0 19 2 175734.25 3.39804602 95.14528656 183665.5 0 20 3 265085.1563 4.83720922 149.9534912 277066.75 0 21 4 295537.4688 5.79803419 173.9410248 309462.0625 0 22 5 287051.2813 5.73275614 177.7154388 300122.0625 0 23 6 283427.0938 6.06057692 181.8173065 296564.9375 0 24 7 282131.6875 5.87049627 181.9853821 295021.3438 0 25 8 255049.0625 5.27634382 163.5666657 266712.875 0 26 9 194966.6719 4.10629463 123.1888428 204172.6406 0 27 10 143700.5 2.7155509 84.1820755 150854.7813 0 28 11 98863.98438 1.84789884 55.43696594 104115.6797 0 29 12 97202.38281 1.69888365 52.66539383 102329.7578 0 30 Total 2508926.969 49.58947372 1509.26675 2626576.547 0
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