Jinko unveils 6.25 MWh SunTera G3, global shipments set for Q4 2025

JinkoSolar, Chinese integrated solar and storage giant, introduced its latest generation SunTera G3 battery energy storage system (BESS) at the 13th Energy Storage International Conference and Expo (ESIE2025) in Beijing last week.

Housed in a standard 20-foot container and engineered for compatibility with global markets, the SunTera G3 boasts a rated capacity of 6.251 MWh. With over 10,000 cycles of operational life and roundtrip efficiency exceeding 95%, the system is designed to maximize discharge output across its lifecycle. Certified to IP55 ingress protection and C5 anti-corrosion standards, it operates at altitudes of up to 4,000 meters and withstands harsh and complex environmental conditions with ease.

“Safety is the bottom line in energy storage, and our core design philosophy,” Wu Dianfeng, general manager of Jinko’s storage division, told ESS News. “Unlike electric vehicles, where safety concerns often stem from collisions, storage systems are grid-connected, requiring far more stringent attention to electrical safety.”

Built on a “safety-first” principle, the SunTera G3 adopts a multi-dimensional defense framework encompassing structural, electrical, and fire safety. Structurally, it features a proprietary five-tier protection architecture that spans from cell to system level. This includes early-warning mechanisms for cell-level anomalies, two-hour fire resistance for the system enclosure, and system-level gas suppression systems to curb the spread of fire. Electrically, the system employs triple-stage fusing to isolate fault currents, augmented by real-time cluster-level leakage detection to ensure current stability and control.

For fire protection, the system offers three levels of response: pack-level suppression, gas-based suppression at the rack level, and water-based suppression for entire enclosures.

In terms of intelligent system management, the SunTera G3 leverages a unified “site-domain-cloud” platform architecture to deliver full-lifecycle smart operation and maintenance. Jinko’s global cloud infrastructure provides robust support for commercial, industrial, and utility-scale storage projects, with data management systems compliant with ISO27001 and IEC62443 standards. This digital backbone enables integrated, real-time, and secure data services worldwide.

Jinko has significantly stepped up its R&D investment in recent years. Beyond in-house cell development, the company has also independently developed its own PCS (power conversion system), EMS (energy management system), and BMS (battery management system). Wu said that a new generation of string inverters and coordinated EMS controllers will soon be deployed in live projects, further reinforcing the company’s technological moat.

Source: Pv Magazine