Solar panel checks from the air: what a drone can see

A standard camera at 15 m shows cracked glass, bird mess, leaves and loose cables on every panel row (sample).
Faults inside a panel, such as a failed cell, only show up as a hot spot on a thermal camera, flown on a sunny day when the panels are working hard.
Tell us the size of the array and when it was installed, and we will tell you which check is worth paying for.