Selection: 8 x 240kWh Lithium Battery Energy Storage Systems
Rationale: Each energy storage system has a capacity of 240kWh. To meet the total requirement of 1680kWh during 3 hours of peak demand (accounting for efficiency losses), we selected eight systems, totaling 1920kWh. This larger capacity ensures redundancy and stable operation, providing sufficient backup even during high-demand periods.
Charging Power: Each system has a charging power of 125kW, enabling the grid to charge the batteries quickly during off-peak hours and ensuring they can deliver adequate auxiliary power during peak times.
Advantages: Lithium batteries are ideal for this application due to their high energy density, long cycle life, and rapid response capabilities. They can endure frequent charge and discharge cycles, ensuring long-term stability and efficiency in high-demand situations.
Rationale: The Power Conversion System (PCS) is a critical component connecting the batteries to the grid, responsible for regulating current and voltage during charging and discharging. Given that each energy storage system has a charging power of 125kW, the PCS power configuration must match this capacity to ensure overall system stability and efficiency. This ensures that both the charging and discharging processes are conducted efficiently and safely.
Advantages: Advanced PCS units provide bidirectional power flow, maintaining high efficiency during charging and precisely controlling output during discharging. This ensures smooth energy exchange between the grid and the batteries, enhancing system performance and stability.
Selection: 125kW Fast Charging Stations
Configuration: Each Estand integrated unit includes a 240kW dual-gun charging station, allowing a single charger to simultaneously provide fast charging for two electric vehicles.
Advantages: The high power output significantly reduces charging times, enhancing the user experience. The dual-gun design improves the utilization rate of the charging station, minimizing wait times for users.
Battery Storage System | |||||
| Battery Capacity(kWh) | Battery Charging Rate | Battery Discharge Rate | Battery Efficiency | Battery Module IP Rating | Battery Cooling System |
| 480*4 | ≤0.5C | ≤0.8C | ≥97% | IP65 | Liquid-cooling |
AC Output | |||||
| Rated AC Output Power(kW) | Max. AC Output Power(kVA) | Rated Output Voltage(Vac) | Output Voltage Range(Vac) | Rated Grid Frequency(Hz) | Max. Output Current(A) |
|
250*4 |
275 |
480 |
-15%~10%(settable) | 60(settable) | 364 |
Charging System | |||||
| Charging Voltage(Vdc) | Charging Efficiency | Connctors | Power Distribution | Charging Power(kW) | Cable |
| 150~1000* | 95% (peak) | 4 | 2 connectors intelligent distribution | 240 per charger | 400A, 5m, CCS |
| *Constant power from 300~1000 | |||||
This solution integrates a battery energy storage system that intelligently absorbs energy from the grid and solar system during off-peak hours, storing it for use during peak demand periods. This approach effectively smooths the power demand curve, reducing instantaneous power demand on the grid.
Smart Energy Management System
The interconnected management of battery modules allows for flexible energy allocation, ensuring efficient power utilization and balanced distribution across the system.
This intelligent and coordinated operation improves the overall utilization and lifespan of the battery modules, while also enhancing the system’s response speed and flexibility to meet diverse charging needs in different scenarios.
By prioritizing charging during low electricity price periods, the system significantly reduces charging costs, enhancing the economic efficiency of the charging stations and saving customers on electricity bills.
By lowering peak power demand, the system eases the load on the grid, avoiding the high costs associated with grid upgrades while enhancing overall grid stability.
