Finland is one of the few places I have not been but from what I hear it can be like the American north east or "New England".
I have lived in our "New England" and the longest stretch we had with clouds blocking most of the sun light was 17 days.
Solar panels will produce some power with over cast if you have the more expensive MPPT charge controller.
I say doing off grid solar with out an MPPT charge controller could be a waste of time in a lot of circumstances.
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