Quick Answer
Factors affecting lightning strike risk for solar panels include location, panel height, panel area, and ground resistance. Proximity to power lines, metal objects, and nearby structures can also increase risk. A well-designed system and proper installation can mitigate these risks.
Understanding the Risks of Lightning Strikes
Lightning strikes can cause significant damage to solar panels, combiner boxes, and the rest of the system. The risk of a lightning strike is directly related to the height of the panels, with taller systems being more vulnerable. For every additional 10 meters (33 feet) in height, the risk of a lightning strike increases by about 20%.
Measuring Ground Resistance
Ground resistance is another critical factor in determining the risk of a lightning strike. A system with a low ground resistance is more susceptible to damage from lightning. To measure ground resistance, use a ground tester to ensure the system’s grounding is adequate. Aim for a ground resistance of 10 ohms or less.
Designing a Lightning-Resistant System
To mitigate the risks of lightning strikes, design a system with a lightning arrestor. This can be a dedicated device or a module integrated into the combiner box. Ensure the combiner box is properly grounded and equipped with surge arresters to protect the system from electrical surges. Regular inspections and maintenance of the system can also help identify potential issues before they become major problems.
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