On April 1, the 14th Energy Storage International Summit & Exhibition (ESIE2026) opened grandly in Beijing. At the event, the global testing and certification authority SGS held a certification ceremony for Shenzhen ZH Energy Storage Technology Co., Ltd., granting the FStack flow battery stack series dual international certifications under UL 1973 and IEC 62932-2-2, becoming a major highlight in safety and compliance at this year’s exhibition.

The certifications cover the full FStack product line—FStack-35, FStack-32, FStack-16, and FStack-10—corresponding to different stack specifications offered by ZH Energy. This milestone signifies that ZH’s products are fully aligned with top-tier international standards for safety, reliability, and technical performance, laying a solid compliance foundation for the company’s global market expansion.

At the ceremony, Dr. Xie Wei, Founder and Chief Scientist of ZH Energy, stated that the certification is an authoritative recognition of the company’s long-term commitment to flow battery technology and its dedication to safety and quality. With high performance and stability, the FStack series has been delivered to more than ten countries worldwide, establishing long-term partnerships with several customers.

The FStack series stacks are independently developed by ZH’s technical team, covering material selection, structural design, manufacturing, and factory testing. Supported by a vertically integrated R&D and production system, the company ensures controllable core technologies, strong product consistency, and stable, reliable quality. Every batch of stacks undergoes multiple rounds of performance and safety testing prior to delivery, ensuring continuous compliance with high operational standards.

As a leading company in flow battery energy storage technology, ZH Energy remains committed to innovation and long-duration storage solutions. This certification is not only an honor but also a new starting point. Moving forward, the company will continue to push technological boundaries, enhance product quality, and deepen industry collaborations—delivering higher-standard products and services to support global clean energy transitions and contribute to the achievement of carbon neutrality.