Sure, power usage and price are the highest during winter, though PV panels are already cheap enough that you can profitably setup them in Finland too. Going of

Sure, power usage and price are the highest during winter, though PV panels are already cheap enough that you can profitably setup them in Finland too. Going off-grid with solar is not an option around the year though. I actually did get myself a 10kWp on-grid plant one month ago. I'm not planning to touch it during winter. The day during winter is so short that it doesn't make sense to take any risks, for example to climb on the roof to clean the panels. Even if you could do it without personal risk, the chance of damaging the panels is non-zero, so the expected value of this activity is very low. It could make sense to install some vertical panels facing south, those would capture a bit of energy even in the winter. But the rotation mechanisms are a waste unless you're area constrained, just add more panels with the same money and the ROI will be better.