Its role in the BOS-B energy storage system

The Deye SUN-125K-PCS01HP3 is a high-performance, 125 kW PCS (Power Conversion System) designed specifically for commercial and industrial (C&I) energy storage systems, particularly the BOS-B Pro-A3 battery platform. This PCS is not just a simple inverter, but the “heart” of the energy storage system: its role is to facilitate bidirectional power conversion between the battery and the AC grid, regulate power output, and manage intelligent operating modes. The SUN-125K-PCS01HP3 provides a stable foundation for scalable, highly reliable BESS solutions.

Deye SUN-125K-PCS01HP3 PCS – For BOS-B Energy Storage Systems

The Deye SUN-125K-PCS01HP3 is a high-performance, 125 kW PCS (Power Conversion System) designed specifically for commercial and industrial (C&I) energy storage systems, particularly the BOS-B Pro-A3 battery platform. This PCS is not just a simple inverter, but the “heart” of the energy storage system: its role is to facilitate bidirectional power conversion between the battery and the AC grid, regulate power output, and manage intelligent operating modes. The SUN-125K-PCS01HP3 provides a stable foundation for scalable, highly reliable BESS solutions.

Its role in the BOS-B energy storage system

The SUN-125K-PCS01HP3 works closely with BOS-B Pro-A3 battery modules, as well as Deye MPPT and STS units such as the STS500L. The nominal energy storage capacity of a battery cluster is up to approximately 215 kWh, with a usable capacity of 193.05 kWh. The PCS plays a key role in peak load reduction, self-consumption optimization, grid feed-in control, and off-grid operation.

Power, Efficiency, and Operating Characteristics

The Deye SUN-125K-PCS01HP3 has a rated AC power of 125 kW and supports high-dynamic charge and discharge cycles. Maximum efficiency reaches 98.5%, which is particularly important in high-power energy storage systems where losses directly impact return on investment. The PCS is capable of handling up to 200% instantaneous peak power, making it well-suited for industrial environments with high startup peaks.

The system operates on the high-voltage DC side, with a battery voltage range of 630–1000 V, which fits well with the BOS-B platform and reduces current losses at high power levels.

Integrated EMS and Intelligent Control

One key advantage of the SUN-125K-PCS01HP3 is that it features integrated EMS functions, eliminating the need for a separate external energy management system for basic operations. The PCS supports zero-export mode, time-of-use (ToU) charging and discharging strategies, as well as optimization of grid and battery operation. Local operation is facilitated by a color LCD display, while remote monitoring can be implemented via WiFi, RS485, CAN, and meter communication.

Environmental Resistance and Reliability

The PCS is manufactured with an IP65-rated enclosure, making it suitable for installation in industrial environments. The operating temperature range is between -40 °C and +60 °C, with automatic derating at higher temperatures. Intelligent air cooling ensures stable operation even under heavy loads, while noise levels remain acceptable in industrial environments.

SOLARKIT Reviews

The Deye SUN-125K-PCS01HP3 is a stable, high-efficiency, and future-proof PCS solution for BOS-B energy storage systems. We highly recommend it for C&I BESS projects where high availability, scalability, and integrated control are critical. With a power rating of 125 kW, 98.5% efficiency, and compatibility with systems up to the megawatt scale, this PCS provides a reliable foundation for industrial energy storage solutions in the long term.