Before the design, it is necessary to determine the size and capacity of the panel used in the case, the arrangement of the panel, the maximum wind speed in the region, and the snow load. If it is a ground case, it is also necessary to confirm the terrain, whether the ground is sloped or flat; If it is a roof case, it is necessary to confirm the roof height and roof structure. It is best to provide detailed roof architectural CAD drawings, etc. others should be analyzed according to the actual situation.