One development that I expected to happen that hasn’t is solar roofs on cars – I’m sure there is a very good reason why it hasn’t been developed – cost – area to return etc But Lorry’s and vans would have quite a large up facing surface area – I wonder if it is being developed somewhere.
The initial offering of the Ioniq 5 had a solar roof and it was, to be honest, a gimmick. The best you’re going to get from one means you’d have to sit in the sun for hours on end to get barely a mile back in the battery.
As you say, having the square footage on the roof of a trailer for the largest HGVs plus the development of lightweight and flexible solar sheets that generate as much power but just stick to surfaces like wallpaper would combine to make a great solution. They’d be a beast to keep clean but would be a great idea for southern Europe, the southern States in the US and other hot areas. I’m sure some clever soul will work out a cost effective way of making it work.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark