18^th Dec, Changzhou – Recently, Trina Storage has successfully completed a full-container 5MWh Large-Scale Fire Test (LSFT) of its self-developed Elementa 2 Pro system under extreme conditions, achieving zero thermal propagation, full structural integrity, and validated system-level safety performance under conditions far exceeding industry standards.

The test was conducted under the full supervision of internationally recognized third-parties, TÜV Rheinland and North American fire engineering consultancy Hiller, and executed in accordance with the latest NFPA 855:2026 & UL 9540A:2025-11 safety standards, under conditions more stringent than standard industry requirements.

The successful completion of this LSFT under rigorous third-party oversight confirms the Elementa 2 Pro's robust system-level safety performance.

A real-site layout — intensified far beyond test limits, with proven safety performance

To simulate utility-scale operation while deliberately amplifying thermal challenges, the LSFT was carried out in a full 1:1 site layout with multiple testing conditions escalated beyond standard requirements:

• 10 cm cabinet spacing — heat concentration intensified

Containers were arranged side-to-side at only 10 cm, far below the 60 cm standard distance, minimizing heat dissipation and increasing thermal stress.

• Maximum energy configuration — 100% SOC full installation

The initiation container was ignited with all modules installed and charged to 100% SOC, maximizing thermal runaway. Battery modules in the adjacent rack roof were also fully charged, significantly increasing the risk of propagation.

• Fire suppression disabled — safety design fully tested without intervention

All automatic suppression and active extinguishing functions remained OFF throughout the test, requiring the system to rely solely on its structural isolation and engineering-level safety design.

• Explosion-vent panels and ventilation system kept open — oxygen flow boosted

Explosion-vent panels and ventilation system remained open to intensify oxygen flow, increasing combustion strength and thermal load beyond real-world failure scenarios.

Despite these extreme conditions, Elementa 2 Pro maintained structural stability and controlled thermal behavior — demonstrating complete end-to-end safety performance from cell to system.

Elevating industry safety standards to new heights

Trina Storage's Elementa 2 Pro integrates self-developed 314Ah high-performance battery cells, coupled with a multi-layered safety architecture and systematic engineering design. With enhanced material upgrades from cell to cabinet level, it delivers comprehensive protection.

Throughout the entire test, the initiation container maintained structural integrity without any collapse, while no thermal propagation occurred in adjacent containers. Its system-level thermal insulation and safety protection fully met expected requirements. Testing by the third-party authority Hiller confirmed that the internal cells showed no signs of abnormality.

Additionally, the fire alarm system was continuously issuing alerts until battery shutdown, critical for real-site response cycles. The UPS within the initiating container remained functional, and the electrical cabinet was preserved intact, validating spatial layout, electrical isolation and equipment protection strategy. Cell temperatures remained below 43.9°C in the back-to-back container and 23.9°C in the side-by-side container — both far beneath the cell venting point — the system showcased outstanding thermal propagation resistance, significantly surpassing typical safety expectations.

From field validation to grid-level operation

This large-scale fire test not only validates resilience under extreme boundary conditions, but also reflects Trina Storage's commitment to safety-first engineering and system-level innovation.

To date, Trina Storage has delivered over 12GWh globally with a zero-incident track record. The company has been recognized as a BNEF Tier 1 ESS manufacturer for eight consecutive quarters and named in S&P Global 2025 Tier 1 list for energy storage systems, reinforcing its leadership position in the global energy storage sector.

Trina Storage will continue to push safety technology forward, working with customers, regulators and partners worldwide to build a safer, more resilient and high-quality clean energy future.