Since a photovoltaic installation does not increase the probability of lightning strikes, the solar modules themselves are no more at risk than the inverter or other loads connected to the grid. However, in the rare event of the solar generator being hit by a direct lightning strike, the modules are likely to suffer considerable damage. The only thing that will help in this scenario is the integration of an external lightning protection system.

Much more frequent, by contrast, are indirect or close strikes, where a branch current of the lightning flows over the electrical installation, inducing a surge. In this case, tiered surge protection at the utility grid feed-in point or at the PV array can significantly reduce the risk of damage. In addition, modern inverters are protected against atmospheric disturbances via thermally monitored varistors.

Good grounding is essential for the proper operation and safety of your solar system. Consult with your installer if you have any questions or concerns regarding system grounding.