By the looks of it you can fit several hundred!
At least 17 people were injured when a tin shed collapsed after spectators at a tractor pull competition climbed on it in Rajasthan’s Sri Ganganagar district, 29th July 2018. The number of injured could be higher, local reports said.
Crazy stuff? Have you ever seen a large number of people on a shed roof. Sheds are generally not designed to take loads on their roof. if you are in a snow zone you should have your shed up rated for snow load or it could be damaged or collapse. Planning on loading it up with solar panels? Get it up graded or check with engineers on its load ability. Remember that the problems could start not when the initial load is there but when you add a person or two doing maintenance or a real heavy hail storm, or snow on the panels plus a person going up to clear it?
Have a great day! Take care out there.