800V AC Bus Integration with Modular Galaxy 418 Deployment for a Confidential Customer
Project Overview
To maximize PV value under time-varying electricity prices, FFD POWER delivered a 2,520 KW/5,016 KWH BESS for a customer-confidential PV project, enabling PV arbitrage through 800 V connection voltage. The project bridges the gap between high PV generation hours—when prices can be low and export value is limited—and the periods when energy carries a higher market value. By capturing surplus PV energy and shifting delivery to higher-price windows, the system increases PV monetization while stabilizing site power flows on the 800V bus.
Project Background
The customer developed a PV project at an undisclosed site. To improve project economics, the owner required an energy storage system capable of capturing PV surplus and shifting energy delivery to higher-value hours (PV arbitrage). The BESS is deployed using a modular architecture (12× Galaxy 418), enabling scalable capacity build-out, simplified O&M, and resilient operation through cabinet-level redundancy. The system is connected at 800 V, supporting efficient power transfer and reduced current stress compared with lower-voltage AC architectures.
Project Challenge
- PV Value Maximization: PV output peaks can coincide with lower market prices, requiring storage-based shifting to improve revenue capture.
- High-Voltage Integration: The system must integrate reliably at 800 V while maintaining stable operation under dynamic PV conditions.
- Modular Deployment and Dispatch Consistency: Multi-cabinet operation requires coordinated control to ensure balanced SOC, consistent response, and long-term availability.
FFD POWER Solution
FFD POWER delivered a 2,520 KW/5,016 KWH BESS for PV arbitrage, deployed as 12× Galaxy 418 units integrated on an 800 V bus. The EMS coordinates charging and discharging to capture surplus PV energy during high-generation periods and to dispatch energy during higher-price windows, thereby increasing PV monetization. The modular cabinet architecture supports flexible expansion and maintenance, while the control strategy manages SOC balancing and power limits across units to maintain stable long-term operation.
System Specifications
- PV installed : Onsite PV with 800Vac Output
- BESS POWER : 2,520 KW
- BESS Capacity : 5,016 KWH
- Product used : 12× Galaxy 418 all-in-one Cabinets (210kW/418kWh Unit) + EMS
- Architecture: PV Arbitrage on 800 V Connection Voltage with Modular Multi-Cabinet Dispatch
Operational Logic: PV Arbitrage with Multi-Cabinet SOC Coordination
The EMS executes price- and PV-driven dispatch while coordinating multiple cabinets for consistent operation:
- PV Surplus Capture: When PV generation exceeds the instantaneous export or utilization value, the BESS charges to absorb surplus energy and avoid missed revenue opportunities.
- High-Value Discharge: During higher-price windows, the PCS discharges the BESS according to the dispatch schedule to deliver energy at improved value.
- Fleet SOC Balancing: The EMS enforces unit-level power limits and SOC balancing across all cabinets to maintain uniform utilization, stable response, and long-term availability.
