If you have a lot of wind, especially gusty, and want a lot of panel area but don't want to build a super-hefty central pivot, you could build a "hamster wheel" cage around the panels via circles of tubing at the inner and outer ends of the set of panels, and then use a T- or cross- frame that supports those from underneath, allowing the cage to roll like a barrel.
Then the entire vertical pole can be rotated around it's own axis if necessary (such as to place in line with rather than across prevailing winds during a high-wind storm, etc).