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Wow that's kind of technical :-) but monthly irradiation is accessible!
Edit: according to those figures a 1m²@20% panel would yield 55w averaged out on 24h, in the summer, and 14w/m² in December.
That's numbers I can work with, thanks!
The solar atlas is another good starting point for making these calculations. Just by looking at the map, you can easily see how location makes a big difference. Solar power in Spain will be pretty good, while in Germany it's a bit meh. If you're in Scotland or Norway, solar power will be even worse. Well, you can always compensate by buying more panels, but that's not great either.
The actual output is also greatly influenced by quite a few variables, like angle, and efficiency of the panel. As the panel ages, the efficiency goes down. Also, higher temperatures decrease the efficiency of the panel, so the burning hot panels in Libya might not produce as much as you thought based on the solar irradiance map. In other words, it's complicated.
Check out this: https://globalsolaratlas.info/map
Be sure to check out the details, it has the exact specs for your location.