Why are there aisles between arrays?

WHY: The SWIF TEN Racking system positions panels on a ten degree slope, which is common throughout the racking industry. Aisles between arrays reduce self-shading created by the difference in elevation between the high side of one array and the low side of the next array. Reducing self-shading will increase annual energy yield, particularly in the winter months. The aisle distance between arrays is ultimately determined by the PV system designer, who is responsible for determining the expected system output by balancing the relationship between many design details, of which self-shading is one.

EFFICIENCY: Because our system is elevated, SWIF can rack panels over sections of the roof, such as roof drains, vents, intermediate parapets, conduit runs and small mechanical equipment where a traditional system cannot be installed. Because of this flexibility, SWIF TEN Racking system may result in greater row-to-row uniformity that benefits string performance and can offset install areas taken up by the aisles.

OTHER ADVANTAGES: Aisles between arrays provide direct access to the roof and other rooftop systems for the purpose of easy maintenance and repairs. Aisles also create clear work zones that allow roofing contractors to fully replace the roof without touching the arrays. SWIF is the only racking system designed so that a building owner can replace the roof without dismantling the solar array.