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UL9540A Large Scale Fire Testing Results for Sodium Nickel Chloride Batteries Used in Stationary ESS Applications

Andrew K. Miraldi

Though Sodium Nickel Chloride batteries have now been commercially deployed and safely operating in stationary backup and ESS applications for the last decade. Recent changes in fire codes, namely NFPA 855, has driven energy storage device manufacturers to preform large scale fire testing to the UL 9540A test method in order to provide data to the AHJ’s to gain exemptions to the new requirements for such things as maximum rated energy in a control area or spacing and clearance of their products. This paper will present the results of the testing from a manufacturers perspective, highlighting challenges and successes relative to compliance to and/or obtaining exemptions to the NFPA 855.

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