2.5 MW Off-Grid Solar-Storage Microgrid for Overseas Mine
Summary: Twenty 125 kW PCS units in parallel deliver 2.5 MW for a large overseas mine, coordinated by a PCC controller with diesel backup for high-reliability off-grid power.
Serving a large overseas mine, this project uses twenty 125 kW PCS units in parallel to build a 2.5 MW microgrid. A single PCC controller coordinates the system, driving contactors to switch between grid-tied and off-grid modes while integrating diesel generators as backup power to keep critical mine loads running.
Project Background
Large mines are often far from the grid and need stable megawatt-level power for crushers, mills and dewatering pumps. Traditional diesel-only solutions have huge fuel consumption, while PV-only solutions cannot guarantee night-time or cloudy-day supply. The customer wanted a PV+storage+diesel grid-forming microgrid to replace the traditional approach with clean, stable and scalable off-grid power.
System Configuration
- 20 × 125 kW PCS units (2.5 MW parallel output)
- 1 × PCC power coordination controller
- Diesel generators as backup AC source
- Contactors + grid-tied/off-grid transfer switches
Project Solution
整套系统采用中腾数能构网型 PCS 与 MPPT 直流耦合技术，具备毫秒级并离网切换、一簇一管理、SOC 主动均衡与高防护等级等能力，可根据现场条件灵活扩展功率与容量。
Site Photos
Operation Results
- Twenty PCS units output 2.5 MW to meet high-power mine loads
- PCS runs grid-tied when diesel is online and auto-switches to grid-forming off-grid when diesel stops
- PCC unifies switchover and power sharing with <20 ms transfer
- Any single device failure or withdrawal does not affect overall system operation
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