BTW, how come the most important piece of info. is left out in the OP?
How many KWH is the battery? It's not saying. And that is what determines the real range. Remove the solar and you're unlikely to even notice the difference in total range.
However, the solar is good when parked for many hours in sunlight. A 1.2 KW charge when parked is better than nothing, but not a lot better, unless you have a lot of time.
Bus since we don't have the numbers there, let's compare to Tesla where we do have numbers. 70 KWH battery, ~325 mile range
A Tesla Supercharger will charge at 150KW. Say that is ~30 minutes for a full charge. The 1.2 KW of solar will take 125 times as long to charge up. 125 times 30=3,750 minutes to charge. 62.5 hours. 2.6 twenty-four hour days of sunlight. Say we have 12 hours of sunlight a day. 5.2 bright sunny days to get the same charge at 1200W with solar.
Again, simple math. But above clearly shows how negligible it is to add solar to an EV. And it makes no difference who does it. A watt is a watt.
It's usefulness is limited to when parked for a long time in the sun, not so much when being driven.
-Don- Reno, NV