PV technology will be integrated into most everything
that is in sunlight and uses electricity. It relates
to batteries, and batteries are expensive. so it
should not be that long. You can downsize batteries,
when you upsize your PVs. Think about it: Your light
weigh carbon fiber vehicle runs out of charge. You
have a couple of options. 1) you might have an air
foil sail that will allow you to move slowly to a
recharge station, with the wind from passing cars
and trucks. 2) You have enough PVs to limp along
at a slow speed, or you can let it set for a
couple of hours and charge up (if it is daytime)