Quick Answer
Yes, lightning can damage an ungrounded solar array. An ungrounded system can conduct electricity through the array's wiring to the ground, causing damage. Proper grounding and lightning protection measures are crucial for safeguarding a solar array.
Lightning Strike Risks
Lightning strikes can damage solar arrays due to the high voltage and current involved. A typical lightning strike can reach temperatures of up to 50,000°C, causing equipment failure and fires. In an ungrounded system, the wiring acts as a path for the electrical current to flow to the ground, potentially destroying the array.
Grounding and Bonding Techniques
To mitigate lightning risks, it’s essential to ground and bond the solar array correctly. The National Electric Code (NEC) recommends a minimum of 10 AWG (American Wire Gauge) copper grounding cable for solar arrays. The grounding cable should be connected to a grounding rod or a grounding plate, ensuring a secure connection. Bonding the array’s metal components, such as the frame and mounting hardware, to the grounding system is also crucial.
Lightning Protection Devices
Lightning protection devices (LPDs) can be installed on the solar array to divert lightning strikes away from the system. LPDs typically consist of a air terminal (such as a rod or a mesh), a down conductor, and a grounding system. The air terminal is designed to attract lightning strikes, while the down conductor safely directs the current to the grounding system. When selecting an LPD, consider factors such as the array’s size, location, and local lightning strike statistics.
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