Can Lightning Strikes Cause Damage to Unbonded Solar Equipment?

Understanding Unbonded Solar Equipment

Unbonded solar equipment, also known as “air insulated” or “air gap” solar equipment, is not directly connected to a grounding system. This design can create a high-impedance path to ground, making it vulnerable to lightning strikes. In the event of a lightning strike, the high voltage and energy can arc through the air gap, causing equipment damage.

Effects of Lightning Strikes on Unbonded Solar Equipment

The effects of lightning strikes on unbonded solar equipment can be severe, including equipment failure, power outages, and even fires. The duration of the lightning strike, typically in the range of 1-10 microseconds, can cause significant voltage spikes in the solar equipment, exceeding 100 kV. This can result in damage to the equipment’s electrical components, such as inverters, DC-DC converters, and wiring harnesses.

Mitigation Techniques for Unbonded Solar Equipment

To mitigate the effects of lightning strikes on unbonded solar equipment, it is essential to ensure that the equipment is properly installed and maintained. This includes ensuring that the equipment is installed on a concrete foundation, and that the mounting system is designed to withstand wind and seismic forces. Additionally, the use of surge protectors, such as surge arresters or lightning rods, can help protect the equipment from voltage spikes and lightning strikes. It is also recommended to use a grounding system, such as a bonding bus, to provide a direct path to ground for the equipment, reducing the risk of damage from lightning strikes.