Latitude and clouds really matter in these calculations. Further up north, the light gets weaker, so you’ll need to compensate with more panels. Also, the sunny hours fluctuate wildly between the short days in winter and short nights in summer.

The closer to the equator you are, the more sense it makes to use solar power. In places like Germany, it’s already fine, in Greece it’s really good. Anywhere south of that, it’s clearly the best solution.