I was also thinking about a shed and someplace to install some PV panels..
So, whatever kind of shed you decide to build/or buy, if you want the
choice of adding some PV later, remember to get a roof dead south
and maybe clear of shade trees.
I liked some of the designs I saw.. Because I live up north, my roof needs
to be about 41 degrees to get max solar. (And for snow to slide off).
I searched on Solar Shed and got a bunch of greenhouse sheds.
I was surprised at the amount of DIY kits
with free shipping that you can find these days on the web..
Good luck
Rich