Much of the developing world is close enough to the equator that solar and batteries just have to last a few days.
In most developed countries solar is seasonal.
Interestingly you don't want to be near the equator for the best solar resource, due to something called the "Intertropical Convergence Zone". This creates persistent storms and cloudiness in a band that waves up and down across the equator.
https://en.wikipedia.org/wiki/Intertropical_Convergence_Zone
Peak efficiency is seasonal. Much of North America is perfectly suited for solar year round, at reduced efficiency.
Solar is one type of renewable. The Nordics have done all right
https://www.nordicstatistics.org/news/the-5-large-nordic-cou...