Large-Scale Fire Testing of Battery Energy Storage Systems Under NFPA 855
The NFPA 855 standard now mandates Large-Scale Fire Testing (LSFT) for Battery Energy Storage Systems (BESS), assessing fire propagation and thermal runaway in multi-unit installations. The LSFT conducted on a 5 MWh Elementa 2 Pro Platform confirmed system reliability under extreme conditions, supporting compliance with updated safety standards.
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The NFPA 855 standard, effective 2026, requires LSFT for BESS to evaluate fire risks in multi-unit installations. Trina Storage executed an LSFT in November 2025, using a 5 MWh Elementa 2 Pro Platform, with Hiller Companies serving as the Registered Design Professional.
The test simulated thermal runaway scenarios, with cabinet spacing reduced to 10 cm and maximum energy configurations at 100% State of Charge. Results showed adjacent container temperatures remained well below safety limits, confirming effective design and operational integrity of the Elementa 2 Pro. These findings provide critical data for permitting and regulatory processes, setting a benchmark for future compliance with NFPA 855.
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