In any case, you don't want them to move in the wind or be flattened by snow loads. Mounting racks are engineered to withstand the elements, and there are many good ones available. Both are angle-adjustable so that your PV array will face the sun as near to perpendicular as possible. Many owners will adjust their mounting racks two to four times a year to get maximum exposure as the sun changes its angle during the seasons. Or if your rooftop has a good angle to the sun, you can mount the modules solidly to the roof without an adjustable rack.
Trackers are another PV mounting option.
Trackers are pole mounts that automatically adjust themselves so that the PVs face the sun throughout the day. Articles are in Adobe Acrobat 4 format and available for Mac, Windows, MS-DOS, and Unix computer operating systems. Acrobat versions earlier than 4.0 may not work with our PDF files. Link to the Adobe site to obtain a free copy of Acrobat reader. Back to systems page .