POWEROAD’s FLEX-261 Series has successfully passed large-scale fire testing conducted in accordance with two key fire safety standards: ANSI/CAN/UL 9540A:2026, Sixth Edition, and CSA/ANSI C800:2025. Following the testing, CSA Group presented POWEROAD with a Letter of Attestation documenting the testing and evaluation.
These evaluations support the technical assessment of energy storage projects in the global markets. Large-scale fire testing (LSFT) data can support fire safety reviews, project permitting, and insurance and financing assessments.
The evaluation covered three POWEROAD models — FLEX 261, FLEX 261 AIO, and FLEX 261 AIO-3S — in multi-cabinet commercial and industrial (C&I) battery energy storage system (BESS) configurations. The results provide technical evidence for system design, fire risk assessment, and compliance planning worldwide.
Strong Results Under Challenging Conditions
Conducted in mid-August 2026, the test evaluated fire containment in a multi-cabinet installation under extreme conditions.
The setup comprised five cabinets: one initiating cabinet and four target cabinets. The initiating cabinet was tested at 100% state of charge (SOC), with fire suppression disabled and the cabinet door and deflagration panel manually opened before testing.
The results showed:
- No Fire Propagation: Fire did not spread to the four adjacent target cabinets.
- No Thermal Runaway in Target Cabinets: No cell venting, thermal runaway, or fire was observed in the four adjacent target cabinets.
- Cell Temperatures and Voltages Within Normal Operating Ranges: Measurements in adjacent target cabinets remained within normal operating ranges.
- No Cabinet Collapse: The cabinets maintained their structural integrity during the test.
These results demonstrate the FLEX-261 Series’ fire containment performance and provide technical evidence for fire safety assessments of multi-cabinet C&I BESS installations.
POWEROAD’s safety approach encompasses fire safety, data security, and asset protection. It has established a Joint Energy Storage Safety R&D Center with a national-level fire safety research institute. Its framework includes data security and management assessments, plus product liability insurance covering systems, cells, and lithium battery packs up to USD 5 million.
With more than 1,000 C&I energy storage projects deployed worldwide, POWEROAD continues to apply its safety-focused engineering approach across diverse applications and markets. The FLEX-261 Series test adds further evidence supporting the technical evaluation of its C&I solutions.
Watch the large-scale fire test video: POWEROAD FLEX-261 Series Large-Scale Fire Test