Sermatec’s 6.25 MWh (587 Ah) battery storage system enters mass production

Sermatec has announced it is now capable of mass producing its Serattice series 6.25 MWh containerised energy storage system using 587 Ah battery cells. This modular 20-foot container (6058 × 2438 × 2896 mm) integrates battery modules, thermal management, fire protection, power conversion and control electronics in a compact form suitable for grid, utility, industrial and renewable energy hybrid sites.

The system is designed with a layered safety architecture that includes real-time cell health monitoring, BMS-enabled early warnings and fault diagnostics, together with battery module-level fuses. It can withstand fire exposure for two hours, helping to contain the spread of thermal runaway. Sermatec highlights its three-stage fire protection design, which combines smoke, temperature and combustible gas sensors with a proprietary Safety Early Warning Box that is said to detect signs of thermal runaway more than half an hour in advance.

The container delivers a roundtrip efficiency of at least 95 % on the DC side, while AC grid connection achieves no less than 88 %. A dynamic thermal management strategy reduces auxiliary power consumption by more than 40 %, while a top-venting airflow design alleviates internal heat-island effects. The system is compatible with both centralized and modular string power conversion system (PCS) architectures, enabling grid-support functions such as inertia response and short-circuit capacity.

The unit operates reliably within a temperature range of –30 °C to +55 °C and at altitudes up to 5,000 m. Variants are available with noise-control and dust-resistant designs to meet the demands of sensitive or harsh deployment environments.

In terms of lifecycle performance, the system adopts a “cloud–edge–device” architecture supported by AI, IoT, digital twin modelling and predictive diagnostics. This enables asset operators to monitor performance in real time, anticipate faults, and optimise market strategies.

Sermatec reports that it has established automated production lines and a mature supply chain to support large-scale deliveries, with initial shipments scheduled to begin in the fourth quarter of 2025 in China.

Founded in 2017, Sermatec is a Shanghai-based energy technology firm specializing in energy storage system solutions and digital energy operations. The company positions itself as a Tier-1 global storage supplier and promotes a “storage + digital intelligence” business model through its 4T technology platform (IT, OT, ET, CT). It offers services across the full lifecycle: investment, development, construction and operation of storage, distributed energy, virtual power plants and zero-carbon parks.

Sermatec also operates multiple production bases domestically (Shanghai, Henan, Ningxia, Inner Mongolia, Xinjiang) and internationally (Malaga, Spain), with a global service and sales network.