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Building one's own solar panels is far cheaper than having them installed by professionals on one's roof.

 

i would think so, but much harder too.

 

Maybe half the price, at best?

Fixed solar panels are operating and harvesting all daylight time, every day. A portable system carried inside the car will be harvesting only when you have it set up. If much less than half-time, portable payback will take longer than fixed-system payback.

Yes, but not huge.

Once the frame is made strong enough to withstand common wind gusts, and anchored well enough to not get blown around and damage itself or other vehicles in the parking lot, it isn't going to be so thin and light.

 

A current fad is solar panels on yachts. Since they sit parked a lot of the time, maybe makes some sense there. Lots more surface area than a car too.

 

If you are in a PG&E service area, then you are saddled with PG&E rates that have punitive pricing that prevents the use of the grid to charge your car from 3 PM to 11 PM every day. Even when the power is plentiful and virtually free, PG&E will charge you in excess of 55 cents per kWh.

That does not compare with the use of home solar to charge your car. That should be a pretty fast return on investment.