I suppose the surface area + efficiency isn't there yet, but it would be sick to take my e-bike places and then expand a canopy to charge and then go on again.

It’s possible! There’s a yearly bike race from Europe to China called The Sun Trip, where people mod their bikes with solar and batteries and ride 12k km to China.

You might like this documentary that covered the first Sun Trip that happened in 2018: https://youtu.be/P1LB0jPh7QQ