Solar chargers

Has anybody attempted to use a solar charger (like the Solio) across Russia? From what I can tell on solar charts, it does't seem to get much direct UV, even in summer (compared to say, Australia or the Middle East) - so I'm wondering if you could even get much charge off one.

Has anyone tried?

Cheers.

Sorry, just realised I should have posted this to the Russia branch - but the question really applies to the whole region anyway.