Sineng Electric promoted string and central power conversion system (PCS) based turnkey BESS at RE+ 2025
While both systems feature a transformer and switchgear on a single platform, the string-based system is equipped with up to 16 PCSs and the central system includes up to 4 PCSs
The BESS models on display incorporate grid-forming functionality
China-headquartered PV inverter and energy storage system (ESS) manufacturer Sineng Electric showcased its latest offerings at RE+ 2025.
The company’s booth showcased its BESS solutions for a broad spectrum of storage applications in the US, including systems for renewable energy (RE) integration, standalone storage, commercial & industrial (C&I) use, and microgrid applications. A key feature, according to Sineng, is that all the storage offerings cover either string PCS or central PCS routes and incorporate grid-forming technology. A PCS, which functions as a bidirectional conversion system, can charge the paired battery banks by converting grid power to DC and discharge the stored energy by inverting it back to AC power to the grid or a connected load. A BESS’ battery banks can relate to multiple PCSs in a string format (string PCS); however, the central PCS configuration pairs all the battery banks at a centralized level. The grid-forming technology used in these PCSs enables the BESS to form a localized grid with desired voltage and frequency during an outage or absence of grid power.
Among the exhibits, Sineng highlighted its medium-voltage (MV) level string PCS turnkey solution, which combines multiple PCSs, battery banks, a transformer, and switchgear, all sharing a common platform. Equipped with 16 string PCSs, each with a conversion capacity of up to 430 kW, it boasts a rated capacity of up to 6.88 MW. However, Sineng didn’t mention the maximum storage capacity.
According to the company, the incorporation of a liquid-cooling mechanism and a power drive control algorithm boosts the PCS’s round-trip efficiency (RTE) by up to 0.2% and reduces auxiliary consumption by up to 30%. In addition, intelligent balancing of the state of charge (SOC) of its battery banks at different cluster levels improves the charge and discharge yield by up to 7%. Sineng claims that the elimination of manual SOC calibration reduces operation & maintenance (O&M) costs by up to 50%. The reference parameters of these performance improvements, however, were not specified.
Also on display was the company’s central PCS-based turnkey solution, featuring 4 central PCSs, each with a conversion capacity of up to 1,725 kW. Paired with a transformer and switchgear in a common platform, it has a rated capacity of up to 6.9 MW. It features the capability to connect with battery banks with a total storage capacity of more than 6 MWh, offering flexibility in backup durations of 1 hour, 2 hours, 4 hours, and 8 hours. The company says that due to the system’s modular design, faulty parts can be replaced with a healthy alternative without requiring a complete shutdown. This attribute helps it achieve a system availability of up to 99%, says Sineng.