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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.
So it seems they might cover a weeks travel assuming 1000km per day. I wonder how much extra weight this would add, and if it's significant compared to the extra weight of the battery and cargo.
It's gonna be significant.
Every extra bit of weight is one less bit of freight.
Also gonna be a lot more annoying when a shipper punches a hole in the side with a forklift.