Ground-Mounted Solar Plants Need Enhanced Earthing for Lightning Safety

⚡ AI Executive Summary

Researchers at Graz University of Technology have conducted detailed electromagnetic modeling of ground-mounted photovoltaic installations to assess their vulnerability to lightning-induced step voltages. Using advanced transient analysis techniques, the team evaluated whether extensive steel pile foundations alone provide adequate grounding or if additional equipotential bonding measures are necessary to meet international safety standards. The findings suggest that earthing design in large solar farms cannot rely on grounding resistance limits alone; soil resistivity and equipotential bonding strategies play critical roles in managing transient potentials during lightning events. As PV deployment shifts increasingly toward utility-scale ground-mounted systems in exposed terrain, operators and designers must adopt more sophisticated earthing design protocols. The research underscores that lightning safety in solar infrastructure requires site-specific analysis and coordination between structural, electrical, and soil conditions—a consideration often overlooked in standardized deployment approaches.