Protecting Pumps Against Power Surges


South Africa has one of the highest lightning ground strike densities in the world, which can have major financial repercussions for businesses and home-owners. Lightning strikes pose a threat to borehole installations, including those using DC solar pumps without a grid connection. This article provides practical tips to safeguard your system and prevent damage from lightning-induced surges.

Understanding Lightning-Induced Failures:

Lightning generates massive energy, inducing electrical currents in nearby wires. This can damage pumps, motors, and other equipment in borehole installations.

Preventing Damage:

Install Surge Arrestors: These devices divert excess electricity to the ground, protecting your system from surges. Place them strategically along your wiring. Choose Quality Equipment: Invest in high-quality surge arrestors and protective gear to ensure reliability during lightning strikes.

Optimize Arrestor Placement: Position surge arrestors close to the pump motor for maximum effectiveness.
Use Proper Cables and Ground Connections: Select appropriately sized cables and ensure robust connections to the ground for effective surge protection.

Regular Maintenance: Check surge arrestors regularly, especially after storms, to catch any issues early.

Insurance Coverage:

While it’s essential to take preventive measures, there are no guarantees against lightning damage. Consider insuring your expensive equipment for added financial protection.


By implementing these measures and considering insurance coverage, you can protect your DC solar pump system from lightning strikes and ensure its longevity.