Efficiency of the panel is also heavily affected by temperature. And sand or dust is also an important step
Notably, Egypt has recurring summertime electricity shortages, and despite being literally in the Sahara desert has been unsuccessfully trying to substantially increase its solar energy production.
Solar power and storage is often not the super-cheap sustainable panacea that theory-crafters make it out to be.
https://worldsustainabilitycollective.com/why-has-egypts-solar-policy-failed/
Discussion
I doubt that less sunny places would produce more energy