Solar Panels

[BB boy]

If you haven't already attempted this, place the solar panel in an open area on the 2D plan, then select the object (first I would try) while selected hold down the ctrl key/left click and drag and drop the object where you want it. Release, if that doesn't work, select the object, open it's dbx see if it has a "floor to bottom" height and if so, enter a dimension (estimate) that would elevate it above the roof apex. Then in elevation camera, find it, select it (you may have to do a ctrl key drag again) and move it into place.
Maybe one of these ideas will work for you.