EV news, page-1736

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 AZ

	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

Data for north Dakota.

	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