TBEA unveils 400 kW+ string PCS, 6.25 MWh BESS

TBEA New Energy has unveiled two new energy storage products at the 13th Energy Storage International Summit and Exhibition (ESIE2025) held earlier this month. Both products are presently available only in China and the specifications of their international versions are yet to be finalized.

The 400 kW+ string-type PCS, model TE400+K-HV-BL, features a compact, lightweight form factor with a volumetric power density of 3 kW/L, 25% higher than the industry average. Each module weighs only 110 kg, reducing transportation and maintenance burdens.

Employing a liquid-cooled system and aerosol-based fire protection, the PCS integrates with battery management and thermal systems to keep key components within safe operating temperatures. Its use of high-frequency switching technology enables millisecond-level responsiveness and supports grid-forming operations, including inertia simulation, frequency regulation, and damping control. It has demonstrated stable performance even in ultra-weak grid environments (SCR ≤1.0), outperforming industry norms, the manufacturer said.

Compatible with battery cells ranging from 300 Ah to 600 Ah, the PCS can be paired with systems from 5 MWh to 6.9 MWh on the DC side, and supports multiple deployment formats, including string-type all-in-one units and containerized AC/DC solutions. It caters to a variety of applications, from commercial and industrial settings to large-scale standalone energy storage plants.

TBEA also introduced a 20-foot containerized AC/DC integrated system with a capacity of 6.25 MWh. According to the manufacturer, this system offers a 25% increase in energy density compared to conventional 5 MWh units, while reducing unit investment costs by 6–10%.

Its space-saving, back-to-back design cuts land usage by 30%, making it well-suited for urban and overseas deployments. Assembled and tested entirely at the factory, including battery packs, PCS modules, fire protection, and communication systems, the system enables an 80% reduction in installation time and 50% faster commissioning, facilitating near-instant grid connection, TBEA said.

Safety features include arc fault circuit interrupters (AFCI), rapid shutdown (RSD) functions, and a three-layer fire protection architecture combining aerosol and water spray systems. The system allows for repeated active fire suppression, enhancing lifecycle safety redundancy.

TBEA said that the rising demand for high-reliability, flexible energy storage systems is driven by China’s dual carbon goals and deepening power market reform. These new products, now entering volume production, mark a shift in string PCS technology from commercial-scale to utility-scale applications. With string PCS now holding a 45% domestic market share, expected to surpass central inverters by 2025, TBEA plans to focus on renewables, grid-side peak shaving, and international markets.

As of March 2025, TBEA’s cumulative global storage deployments have exceeded 4 GWh.