How can I determine the maximum pier spacing for my Ironridge ground mount project?
Ironridge has certification letters for their ground mounted system from more than half of all states in the US (find the resource hub on their technical support page). In most of these certification letters, you can find tables specifying the maximum distance between piers. You can then use this information to determine the number of piers required per subarray. To make sure you’re looking at the right table, have the following information on hand:
Wind exposure (B or C): _____
Wind load [mph]: _____
Snow load [psf]: _____
4-module or 5-module up: _____
Pipe size (2 inch or 3 inch): _____
Diagonally braced or unbraced: _____
Subarray or table slope (0 to 45 deg): _____
For example, let’s say we have a system in California with the following characteristics:
Wind exposure (B or C): C
Wind load [mph]: 110 mph
Snow load [psf]: 0 psf
4-module or 5-module up: 4 modules up
Pipe size (2 inch or 3 inch): 3” pipe
Diagonally braced or unbraced: Unbraced
Subarray or table slope (0 to 45 deg): 30 degrees
According to the certification letter, we would have a maximum pier spacing of 115” or 9’-7”.
If your state does not have a certification letter with tables and you’d like to verify your system’s BOM, please contact Ironridge directly. RENVU does not guarantee that the system design resulting from this evaluation is appropriate for your needs, nor does the system design address the adequacy of the foundation/structure upon which the system will be installed. Please ensure the system is installed in a code compliant manner based on accurate site information.