What is the appropriate spacing between photovoltaic support beams (i) The maximum spacing between two parallel main reinforcing bars shall be 3dor 300mm or whichever is less, and (ii) The maximum spacing between two secondary parallel bars shall be 5dor 450 mm or whichever is. . What is the appropriate spacing between photovoltaic support beams (i) The maximum spacing between two parallel main reinforcing bars shall be 3dor 300mm or whichever is less, and (ii) The maximum spacing between two secondary parallel bars shall be 5dor 450 mm or whichever is. . Module Spacing: To avoid shading between adjacent PV modules, which would reduce energy efficiency, the spacing between modules should be determined based on the local solar altitude angle and the size of the modules. Typically, the spacing should be 1. Why? Many customers do not know that: 1. The beam spacing involves the L feet or hooks fixed on the beam (generally the main beam), and the distance between the two main beams is the span. . tself can support the concentrated loads from the solar array. Table 1 assumes that the roof complied with the building code in effect at the time of construction, and places limits on anchor horizontal spacing to ensure that a roof structure is n t overloaded under either downward loads or wind. . Installing solar panels on roof is a challenging task. It's essential to ensure there's sufficient space not only on the roof itself but also between each panel. That said, there are two. .