Sungrow Says PowerTitan 3.0 Fire Test Showed No Spread at 28.56 MWh

Sungrow reports that the peak internal temperature in the initiating container, Container A, reached 1259.8°C. The highest cell temperature in the adjacent containers stayed below the thermal-runaway threshold under UL 9540A:2026, though the release gives no figure for it. The company said all five containers, A to E, stayed structurally intact and that Container A could be lifted as a single unit afterwards.

All smoke and fire effluent went through a purification system, and Sungrow said none was released untreated.

How the Stacked-Cell AC Block Is Built

PowerTitan 3.0 uses stacked cells and an integrated AC-block design that puts the battery system and the DC/AC power converter unit in a single 20-foot container. Sungrow said PowerTitan 1.0, 2.0 and 3.0 each passed their large-scale fire tests on the first attempt. It also said hundreds of pre-test simulations predicted fire behaviour that closely matched the physical test.

A UL Solutions engineering manager, Benjamin Liu, is quoted in the release as saying the design contained the fire and prevented propagation.

What Is Not Independently Confirmed Yet

Every figure above comes from Sungrow's release and the ESS News report that follows it. No independent test report or UL certificate has been published in the material reviewed. ESS News notes the release names containers A to E but does not say which one held the substation, and the adjacent-cell temperature is not given.

Watch for the full UL test report, which would show how much margin the adjacent cells had, and for how developers and insurers use the result to set container spacing on utility-scale sites.