Shanghai – September 07, 2026 -- APsystems' liquid-cooled commercial and industrial (C&I) energy storage system, APstorage 261L, has passed the UL 9540A fire propagation test under supervision from TÜV Rheinland, containing thermal runaway entirely within a single cabinet with no spread to adjacent units.

Shanghai – September 07, 2026 -- APsystems' APstorage 261L liquid-cooled commercial and industrial energy storage system has passed UL 9540A fire propagation testing, with thermal runaway fully contained within a single enclosure under witness from TÜV Rheinland.

Tests under extreme conditions show zero fire spread

The APstorage 261L cabinet was tested at 100% state of charge with its fire suppression system deliberately disabled. No short circuit, fire spread, or explosion occurred, and the cabinet maintained structural integrity throughout the test.

Shanghai – September 07, 2026 -- APsystems' liquid-cooled commercial and industrial (C&I) energy storage unit, the APstorage 261L, has passed the UL 9540A fire propagation test under the supervision of TÜV Rheinland, with thermal runaway fully contained inside a single cabinet during trials.

Shanghai – September 07, 2026 -- APsystems' liquid-cooled commercial and industrial energy storage system, APstorage 261L, has passed the UL 9540A fire propagation test under the supervision of TÜV Rheinland, containing thermal runaway entirely within a single cabinet during the trial.

Shanghai – September 07, 2026 -- APsystems' APstorage 261L liquid-cooled commercial and industrial energy storage system has passed the UL 9540A fire propagation test under the witness of TÜV Rheinland, with thermal runaway fully contained within a single cabinet and no propagation to adjacent units.