Quick Answer
Install solar disconnects at the combiner box, typically located near the top of the solar array, to provide a convenient location for disconnecting power from the panels and facilitating system maintenance.
Location near the Solar Array
When choosing a location for the solar disconnect, consider placing it near the top of the solar array, ideally within 6-8 feet of the combiner box. This configuration allows for easy access and minimizes the risk of electrical shock. Ensure the disconnect is at least 3 feet away from any roof edge or adjacent structures to maintain a safe working distance.
Accessibility and Weather Protection
Select a location that provides adequate weather protection and easy access for maintenance personnel. A location under a roof overhang or within a dedicated solar array enclosure is ideal. If exposed to the elements, consider using a weather-tight enclosure or a NEMA 4X rated disconnect box to protect the equipment. When possible, position the disconnect at the same elevation as the combiner box to simplify wiring and reduce sagging cables.
Considerations for Mounting and Cabling
When mounting the solar disconnect, ensure it is securely fastened to a sturdy structure, such as a roof truss or a dedicated solar array bracket. Use cable ties and cable glands to manage cabling and prevent water ingress. For systems with multiple arrays or a large inverter bank, consider installing a secondary disconnect at the inverter or main electrical panel to provide additional safety and redundancy.
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