Both DC PV SPD and DC ESS SPD are devices that provide surge protection in direct current (DC) systems, but

Their intended uses and designs are different.

DC PV SPD : IEC 61643-31, 32

Used in photovoltaic (PV) systems.

Protects solar system components such as solar panels, inverters, and charge controllers from lightning and voltage surges.

Designed to suit the characteristics of solar power generation systems and respond to DC voltage fluctuations.

DC ESS SPD : IEC 61643-41

Used in energy storage systems (ESS).

It protects the battery-related system and responds to surges that may occur during battery charging and discharging with a design tailored to the characteristics of ESS.

Since ESS is responsible for power storage and supply, DC ESS SPD plays an important role in stable energy management.

These two devices are designed to suit each system requirement, ensuring the stability and safety of the DC system.