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Sweden is testing a semi-truck trailer covered in 100 square meters of solar panels
(www.popsci.com)
This is a most excellent place for technology news and articles.
They can gain 50,000k extra a year, but its also a plug on hybrid so don't know how much is panel vs hybrid.
I just want to point out that 50,000k = 50,000000.
5000 not 50000