You can have an easier time if the solar panels are mounted on the bottom of the drone, and you shine a large laser at them. Disclaimer: I am involved with a company that does it this way.

Nasa has built[0] a drone awhile back that flies on solar power, though it was limited to flights during daylight hours as not enough mass was available for enough batteries to last the night.

[0]: https://www.nasa.gov/centers/dryden/history/pastprojects/Era...