On: Sprite: a different drone

[chinpokomon]

I don't know that the energy density of solar cells work for their weight. Electric motors require a pretty high current. Even if you are supplementing another power source, I think you'll still be losing more than you are gaining for that application. You are probably fine with fixed wing, but multicopter designs will draw significantly more power.

[cellularmitosis → chinpokomon]

I'd assume he's referring to having solar charging stations at the way-points.