Lightning strikes can severely damage your fence energiser, although you can minimise the risk during electrical storms by disconnecting the energiser from the electric fence and from the power supply.
A Lightning Diverter will also help protect your fence energiser. Lightning always finds the easiest path to ground, so a diverter aims to provide a better path than the energiser itself. The choke element of the diverter effectively blocks the lightning’s extremely high voltage of the lightning, forcing it to jump the silicon carbide discs in the arrestor and is divert to ground.
In areas where lightning is a major problem, you should put several lightning diverters in different areas around your electric fencing.