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APsystems Achieves a Major Safety Milestone with Successful UL 9540A Test for APstorage 261L

APsystems, a renowned provider of energy storage solutions, has marked a significant milestone in safety for its portfolio designed for commercial and industrial purposes. On September 3, 2026, the company announced the successful completion of the UL 9540A test for its liquid-cooled storage solution, the APstorage 261L. This achievement underscores APsystems' commitment to safety and reliability in its products.

Importance of UL 9540A Testing

The UL 9540A standard is widely recognized globally as one of the most stringent safety criteria for energy storage systems. It evaluates the thermal runaway behavior at the level of cells, modules, and installations by analyzing heat release, smoke generation, temperature rise, and system response. This rigorous testing process is essential to verify the system’s resilience against fire and explosion hazards, ensuring maximum safety for users.

During the testing phase, the APstorage 261L was subjected to extreme conditions to assess its safety performance accurately. The unit operated under 100% charge while the fire suppression system was deliberately disabled. Remarkably, even in these challenging circumstances, there were no short circuits, fire spread, or explosions, and the unit maintained its structural integrity throughout the test.

Key Test Results

The test results revealed impressive findings:

• - The thermal flow measured 0 kW/m² near the affected unit, significantly lower than the UL 9540A threshold of 1.3 kW/m². This confirms there was no risk of ignition to neighboring devices due to thermal radiation.
• - The maximum surface temperature recorded was 83.9 °C on both the affected and adjacent modules, demonstrating effective heat containment between units.
• - The maximum temperature of the surrounding wall reached only 30.6 °C, just 3.1 °C above ambient temperature, indicating minimal thermal impact on the environment.

Throughout the testing hierarchy from cell level to enclosure level, thermal runaway remained confined within a single unit, successfully preventing any spread to neighboring units. This comprehensive protection reaffirms the robust engineering behind the APstorage 261L.

Safety by Design

Safety has been integrated into every aspect of the APstorage 261L’s design. The system features a single-cluster architecture with liquid cooling, effectively keeping temperature variations within the cells under 3 °C. This not only enhances battery life but also increases operational safety. The safety architecture incorporates:

• - A four-tiered fire protection system
• - Active ventilation
• - Passive pressure relief mechanisms

Together, these elements create a robust, multi-layered safety framework that protects the system from the cell level to the entire installation.

Crafted for Commercial and Industrial Applications

In addition to its exceptional safety specifications, the APstorage 261L is engineered for quick and flexible deployment in commercial and industrial applications throughout Europe. With a footprint of just 1.3 m², the system is equipped with a "plug and play" connection, facilitating installation and commissioning.

Its modular architecture allows seamless parallel expansion across multiple units, making it an ideal solution for industrial sites, commercial buildings, and applications involving solar storage and charging.

To support its extensive European network, APsystems has established a specialized inventory for commercial and industrial solutions in the Netherlands. This ensures local availability of products, expert training, and reliable on-site technical support.

As APsystems continues to expand its portfolio of comprehensive energy storage solutions, APstorage remains dedicated to achieving ever-higher levels of safety, performance, and reliability. For further details, please visit APsystems website.