Recently, the FStack-35, FStack-32, FStack-16, and FStack-10 series flow battery stacks developed by Shenzhen ZH Energy Storage Technology Co., Ltd. have successfully obtained the IEC 62932-2-2 international standard certification and UL 1973 energy storage safety certification, following completion of comprehensive compliance testing and audit by the authoritative third-party institution SGS. This achievement marks that ZH Energy’s flow battery stacks fully meet the access criteria of mainstream international markets in terms of safety, stability, and key performance metrics, officially attaining the qualification of global export-grade energy storage products.

IEC and UL certifications are widely regarded as the "passport" for energy storage products to enter the international marketplace. Specifically, IEC 62932-2-2:2020 serves as the core international standard governing the safety of stationary flow battery energy storage systems, imposing stringent requirements on stack performance including adaptability to extreme operating conditions, long-term operational reliability, cycle stability, and system-level safety protection capabilities. UL 1973, meanwhile, is a highly recognized energy storage safety certification across North American and global markets, focusing on evaluating the structural safety, electrical safety, and operational dependability of electrochemical energy storage devices in commercial and industrial application scenarios. Both certifications are renowned for their rigorous testing protocols, extended review cycles, and high approval thresholds, thus carrying significant industry credibility and market value.

The FStack series flow battery stacks are independently developed by ZH Energy’s technical team, covering the entire lifecycle from material selection, structural design, and manufacturing to factory acceptance testing. Leveraging its full-chain in-house R&D and production system, the company has achieved full control over core technologies, high product consistency, and reliable overall quality. Each stack undergoes multiple rounds of performance, stability, and safety testing prior to delivery, ensuring that all products meet stringent operational standards consistently.

To date, the FStack series flow battery stacks have been successfully exported to multiple countries and regions including the United States, Bulgaria, India, Japan, Thailand, and Vietnam, with stable operation verified across application scenarios such as scientific research validation, commercial and industrial energy storage, and microgrid systems. Following on-site performance testing of the stacks and factory inspections at ZH Energy , numerous overseas clients have completed multiple repeat orders, with a reorder rate exceeding 50%. This fully validates the international competitiveness of ZH Energy’s stacks in terms of energy efficiency, operational stability, and lifespan reliability.

The acquisition of dual IEC and UL certifications not only represents authoritative recognition of ZH Energy’s technical capabilities and product quality, but also signifies that the FStack series flow battery stacks have secured official global market endorsement. Moving forward, ZH Energy will continue to advance the international layout of its flow battery technologies. Backed by its independently controllable material systems, structural design, and manufacturing capabilities, the company will provide integrated technical support and core stack product exports to global clients. We sincerely invite overseas system integrators, project developers, and research institutions to engage in in-depth exchanges and collaboration, jointly promoting the large-scale deployment of flow batteries in the global long-duration energy storage market.

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