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it might be an option for those off-grid... like rural rice farmers
If you have enough sunshine to grow rice, you have enough to generate your 250Wh per day with Solar PV for well under the $100 target price of his bicycle, and you don't have to waste a couple of hours when you could otherwise be working to get it.
Sure, it's not as good as a cheap, reliable energy supply from a national grid but it might be an option for those off-grid... like rural rice farmers and testers during northern european winters ;-)