Covering large parking lots with solar panels is an idea that goes back decades but in America at least it’s an idea that has never really taken off.
What is the reason for that? Is it due to the overall cost or is there something else that keeps Walmart, Target, Costco, Sams Club, Malls, etc. from covering their parking lots with these panels and selling the power?
Or if you do them on site, there’s a roof on the store that you can use first, without needing to do construction work. Covering the parking spaces requires some measure of construction work, underground electrical work, etc that could end up being pretty expensive compared to alternatives.
That assumes the buildings can handle them. A company I used to work for was planning to put solar on pretty much all of their buildings. Until they found out most of their buildings couldn’t handle the weight without significant (expensive) reinforcing. Many of their installations ended up on the ground instead.