UL 9540 / UL 1973 Certified Lithium Battery Storage System Safety Design

The UL 9540 / UL 1973 Certified Energy Storage System is a lithium battery energy storage solution designed for commercial, industrial, renewable energy, and grid-connected applications in North America. The system combines certified battery technology with integrated battery management, power conversion, thermal management, and safety protection to provide a reliable energy storage platform for stationary applications.

UL 9540 covers the safety of complete Energy Storage Systems and Equipment, including system-level electrical, electrochemical, mechanical, control, protection, and communication functions. UL 1973 addresses battery systems used for stationary energy storage applications such as photovoltaic, wind energy storage, and UPS systems.

Key Features

• UL 9540 Certified ESS – System-level certification for applicable energy storage system configurations.
• UL 1973 Certified Battery System – Battery system evaluated for stationary energy storage applications.
• LFP Battery Technology – Lithium iron phosphate battery chemistry for stationary energy storage applications.
• Intelligent BMS – Monitors cell voltage, current, temperature, SOC, and other operating parameters.
• Integrated Thermal Management – Helps maintain appropriate battery operating temperatures during charging and discharging.
• Multi-Level Safety Protection – Includes electrical protection, thermal monitoring, fault detection, and configurable fire-safety functions.
• Modular Architecture – Supports different battery capacities, PCS ratings, enclosure configurations, and system designs.
• North American Market Applications – Suitable for projects requiring applicable UL-listed energy storage equipment.

UL 9540 System Certification

UL 9540 is the primary UL standard for evaluating complete energy storage systems and equipment. It covers ESS intended to store energy and subsequently supply electrical energy to loads or an electric power system. The standard applies to electrochemical, chemical, mechanical, and thermal energy storage technologies.

System-level evaluation can address:

• Energy storage and protective functions
• Charging and discharging functions
• Electrical safety
• Protection and control systems
• Communication between system components
• Enclosures and construction
• System controls
• Utility grid interaction
• Installation and operating information

UL Solutions notes that an ESS can achieve certification through evaluation of matched components assembled by the manufacturer or system integrator and submitted as a complete system for certification.

UL 1973 Battery Safety

UL 1973 applies to battery systems used for stationary energy storage applications, including applications such as PV energy storage, wind energy storage, and UPS systems. The standard evaluates battery-system safety characteristics relevant to stationary applications.

The battery system can incorporate:

• Lithium iron phosphate battery cells
• Battery modules and racks
• Battery management system
• Electrical protection
• Temperature monitoring
• Mechanical protection
• Battery disconnect and protection devices
• Communication interfaces

Applications

This UL-certified energy storage system can be configured for:

• Commercial and industrial energy storage
• Utility-scale battery energy storage
• Solar PV + battery storage
• Renewable energy integration
• Grid-connected BESS
• Peak shaving and demand management
• Microgrid energy storage
• Backup power
• Distributed energy storage
• EV charging energy management