But there's another consideration: albedo (reflectance of the earth's surface). If the warehouse roofs already tend to be dark-colored, solar panels wouldn't reduce the area's albedo as much as covering light-colored ground (like sand).

I saw an assertion somewhere that if we put enough solar panels in the desert to meet all of our energy needs, the net decrease in the earth's albedo would cause as much warming as the burning of equivalent fossil fuels.

A search brings up this article (not necessarily the one I'm remembering, but interesting): https://theconversation.com/solar-panels-in-sahara-could-boo...