Quick Answer
Solar panels can survive direct lightning strikes but may suffer damage to the combiner box, inverter, and electrical wiring. The likelihood of damage depends on the strike's intensity, duration, and proximity to the panels. Proper installation and protective measures can minimize risks.
Lightning Protection Fundamentals
Solar panels are designed to withstand high voltage and current surges, but the combiner box and electrical wiring can be vulnerable to lightning strikes. A direct strike can induce a massive voltage spike, potentially damaging the electrical system. To mitigate risks, installers often use surge arresters, which can absorb or divert voltage surges up to 100 kA (10 kA for smaller systems).
Surge Arrester Selection
When selecting surge arresters, consider factors like voltage rating, current rating, and energy absorption capacity. For solar systems with a combiner box, use surge arresters rated for 100 kA or higher, and install them as close to the combiner box as possible. In systems with multiple panels, use a single surge arrester for the entire string to minimize costs and complexity.
System Design and Installation
Proper system design and installation can significantly reduce the risk of damage from lightning strikes. Ensure that all electrical wiring and connections are shielded, grounded, and properly secured. Use equipment with built-in lightning protection, such as inverter surge arresters, and follow local building codes and industry standards for lightning protection.
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