In more northern regions, you get much less light in the winter. You effectively can only generate around one tenth of the energy you can in the summer - this is from experience talking to others who monitor their solar installations.
But, you need more energy in the winter. People are in more, using electricity for heat cos it's colder. I'm pointing out that there is a supply/demand reversal. Sure there are sweet spots in spring and autumn, but when you really need energy, you have less.
You can mitigate some minor fluctuations with batteries.... Ie you can smoothen things a bit, but you can't really take the summer's excess, to use in the winter.
It just seems like a fundamental mismatch, that leaves you exposed, when you need the most amount of support.