Yeah. the one good use I see is reefer trailers. Since some times they have to sit long times, with still the coolers running to keep the cargo within demanded thermal limits to keep the cold chain uninterrupted.

Most cooling is obviously needed when it is hot... so in summer and thus sung light time. So the panels would probably nicely run the coolers instead of having a fuel burning generator keeping the coolers going.

During winter, when there is no light. Well it's probably cold enough ambient the reefer isn't using lot of cooling anyway.

20kwc capacity: nice also add 20kwh lithium storage at 200kg weight and it could help in few instances like cooling perishable cargo or driver's cabin when engine shut off, but definitely not to expand range

Yeah but we're talking 100 square metres here, that could make a significant difference.

Oops 🙊 you know what I mean though.

It's Sweden, it works weird

Put solar panels on a vehical and move it around the globe xD

Solar panels on one side, lunar panels on the other! Boom! Free electricity 24/7!

Solar ditches make more sense. Carrying solar panes add weight and air resistance. The trailer area is 416 ft which can hold ~33 panels if panel configurations are optimized for a trailer. Weight will be 3000 lbs, which cuts the tare payload by 6%. This is not enough electricity to run a semi with two drivers splitting driving responsibilities, running day and night, and in weather that does not have power for the cells.

Trains are the most efficient system that we have. I wonder how the math would work for trains? I expect that it would be a net gain, but the added complexity of connecting and disconnecting for each car as the cars get switched in yards would be a nightmare. Once travelling, there is little braking and acceleration, which lowers the power demands.

A tractor trailer FULL of solar panels would be great!

Those don't exist.

Amount of power that can be generated is dictated by the angle to the Sun. You need to be perpendicular. Panels on the ground can slowly move and rotate to kind of track the sun. Or you put a bunch of mirrors and make a tower made of solar panels.

Solar panels on roof tend to be fixed infrastructure. You get what you get.

So if they apply panels to a vehicle you have two options. Flat or angled.

If they're flat and the only time you're ever going to get the maximum amount of power from them is during noon when the sun is directly above your vehicle. If angled that means the height of the vehicle has changed and they direction that they work is very dictated. If they track the Sun then they're probably going to waste more power than they can ever produce by constantly moving because you're on a vehicle that's constantly moving.