The NXP ESS is a production-grade battery management system (BMS) reference design for high-voltage energy storage systems up to 1500 V. The NXP ESS provides a complete hardware, software, and safety architecture for utility, commercial, industrial, and residential energy storage applications. Developed in compliance with IEC 61508 and IEC 60730, the NXP ESS includes safety software, documentation, and supporting components designed to facilitate system development targeting SIL 2 and Class B functional safety requirements. The NXP ESS enables scalable and safety-oriented energy storage system designs while helping reduce development complexity.