Chinese inverter and energy storage manufacturer Deye has unveiled a new commercial and industrial (C&I) battery energy storage system capable of scaling up to 2.5 MW, with a headline feature of zero-millisecond grid switching designed to protect sensitive loads from power interruptions.

System Architecture and Scalability

The new platform is built around a modular design that pairs power conversion system (PCS) units — available in either 100 kW or 125 kW configurations — with battery clusters rated at 257.23 kWh each. The modular approach allows operators to size deployments according to site-specific demand, with the system architecture supporting expansion up to the 2.5 MW ceiling. This kind of flexible scaling has become a common requirement in the C&I segment, where energy loads can vary considerably across manufacturing facilities, data centers, commercial campuses, and similar installations.

Zero-Millisecond Switching

The most prominent technical claim attached to the new system is its zero-millisecond transfer time when switching between grid-connected and islanded operation. Transfer time is a critical metric for C&I customers whose equipment — ranging from industrial machinery to sensitive electronics — cannot tolerate even brief voltage interruptions that occur during conventional automatic transfer switch operations. A zero-millisecond switching capability, if validated under real operating conditions, would place the system in a performance tier typically associated with online uninterruptible power supply architectures rather than standard battery storage inverters.

Market Context

Deye's announcement adds to a growing catalog of high-capacity C&I storage products from Chinese manufacturers targeting both domestic and international markets. The combination of relatively large per-cluster battery capacity and multi-hundred-kilowatt PCS units reflects an industry-wide push toward fewer, larger building blocks that reduce installation complexity and balance-of-system costs. The 257.23 kWh cluster size, paired with either PCS option, gives system integrators straightforward ratios for calculating total energy capacity at any given power level within the 2.5 MW envelope.

No pricing, availability timeline, or specific certification details were included in the materials accompanying the product launch.