A curved roof is a fairly new design that concentrates on aesthetic more than durability. The round-roof barn, which is one of the earliest examples of curved roofs, was first seen in the 1920s. Its design came from people who were attempting to maximize the space in their lofts for hay storage. Since then, many barn type roofs have been redone with round roofs, and many of them were built during periods of world war. Most of the pre-World War II barns that have round roofs are scattered throughout the United States, and they can mostly be found in the mid-West. 

Can solar panels be curved? 

The short answer to the question of whether or not solar panels will warp or bend on their own is no, they won't. ... The frame of most solar panels is composed of aircraft-grade aluminum. This is done for three reasons: Weight.

How to install the solar panel on the curved roof? 

Solution created for the installation of photovoltaic modules on curved structure.

The proposal involves installation of a structure composed of an extruded aluminium profile alloy  6060, conveniently curved to follow roofing bending.

In addition to the traditional curved roof, the most widely used is the rv curved roof is the most widely used.

Depends on the dimensions of the panels, how you orient them on your roof and how much curve you're having to work with.

a curved roof need a pieces of thick aluminum angle, 2 for each corner. One for panel and one for roof on each corner. they mated with a single pivot point so that they were tiltable. Bolted the panel to its mounts and used 3M 5200 marine adhesive to attach mounts to fiberglass roof (trying to eliminate as many roof holes as possible).

The height of the mounts has to be greater than the amount of roof curvature so keeping the panel longways on the roof means less height needed. More height means greater chance for wind forces to get under it but also means more ventilation which improves performance of panel.