Designed for large-scale energy storage projects, this 6.25 MWh containerized BESS integrates LFP batteries, PCS, EMS, liquid cooling, fire protection, and communication systems in one 20ft container. Its AC/DC integrated design helps reduce field wiring, equipment matching, and commissioning work.
With 430 kW × 4 output, string-type architecture, and rack-level management, the system supports flexible expansion, fault isolation, and easier long-term maintenance for utility-scale, C&I, and grid-connected battery storage projects.
Optimized for Your Energy Needs
Higher Efficiency by Design
The 6.25 MWh battery storage container delivers high energy capacity in a 20ft container, helping reduce project footprint and land use. Its rack-level management and high-density integration improve system utilization for utility-scale and C&I energy storage projects.
Flexible for Demanding Sites
The AC/DC integrated design combines batteries, PCS, EMS, liquid cooling, fire protection, and communication systems in one containerized BESS. This helps reduce equipment matching, field wiring, and commissioning work during project deployment.
Multi-Level Safety Protection
Multiple safety layers help support stable operation in grid-connected battery energy storage projects. Redundant insulation protection, reduced arc risk, and four-level short-circuit protection help limit electrical faults and improve system safety.
Easier Operation and Maintenance
Hot-swappable PCS, loaded isolation, unified interfaces, and automatic liquid replenishment make daily maintenance easier. AI-based management helps reduce manual intervention and supports more efficient long-term operation.
Specification
| Model | CESS |
| Application | On-grid |
| DC Parameters | |
| Cell Type | LFP 3.2V / 587Ah |
| Configuration | 8P416S |
| Rated Energy | 6.25MWh |
| Voltage Range | 1040V~1497.6V |
| Depth of Discharge (DoD) | 95% DoD |
| Cycle Life | >6000 cycles @ 80% EOL, 25°C |
| Battery Voltage Range | 1000–1500V |
| Maximum Operating Current | 473A × 4 |
| Voltage Regulation Accuracy | ±2% |
| Current Regulation Accuracy | ±5% |
| AC & Grid Parameters | |
| AC Input Connection | Three-phase four-wire (3W+PE) |
| Rated Output Power | 430kW × 4 |
| Overload Capability | 110% overload: 10 min; 120% overload: 1 min |
| Rated Grid Voltage | 690 Vac (+15% / -10%) |
| Rated Grid Frequency | 50Hz |
| Power Factor | >0.99 at rated power |
| Adjustable Power Factor Range | 1 leading ~ 1 lagging |
| Current THDi | <3% at rated power |
| PCS Basic Parameters | |
| Maximum Efficiency | 99% |
| Protection Rating | IP66 C5 |
| Operating Ambient Temperature | -30°C to +70°C; derating above 50°C |
| Relative Humidity | 0–100% |
| PCS Dimensions (W × D × H) | 1890mm × 615mm × 230mm |
| PCS Weight | ≤300kg |
| PCS Maximum Operating Altitude | 4000m; derating above 3000m |
| System Parameters | |
| System Dimensions (L × W × H) | 6058mm × 2438mm × 2896mm |
| System Weight | <47T |
| Corrosion Protection Grade | C4 / C5 |
| Enclosure Protection Rating | IP55 |
| Cooling Method | Liquid Cooling |
| Operating Temperature Range | -30°C to +50°C |
| Operating Humidity Range | 0–95% RH, non-condensing |
| Maximum Operating Altitude | ≤2000m |
| Fire Protection | Full-fluoroketone system, smoke detection |
| Communication & Standards | |
| Communication Interfaces | RS485, CAN, Ethernet |
| Communication Protocols | Modbus TCP, Modbus RTU, CAN2.0 |
| Standards | GB/T 34120, GB/T 34133, GB/T 36276, GB/T 34131 |
Application Scenarios
In project planning, the 6 MWh Battery Energy Storage System Container is often selected for on-grid energy storage projects where energy density, system integration, safety, and long-term operation matter. It can be deployed as a single 6.25 MWh containerized energy storage system or combined with multiple containers for larger MWh-scale battery storage plants.
Utility-Scale Energy Storage
For utility-scale BESS projects, this utility-scale battery storage container supports peak shaving, load shifting, renewable power smoothing, frequency regulation, and grid support. Its 20ft high-density structure helps reduce project footprint and supports repeatable deployment across large storage plants.
Solar-Plus-Storage and Wind Energy Storage
In solar-plus-storage battery system and wind energy storage projects, the container stores surplus renewable power and releases it when output drops or demand increases. This helps improve renewable energy integration and creates a more stable power delivery profile for grid-connected projects.
Commercial and Industrial Power Management
Industrial parks, factories, logistics centers, and large commercial sites can use this commercial and industrial BESS container for peak shaving, load shifting, and grid-connected backup support. Polinovel also provides commercial and industrial energy storage solutions for site-level power planning.
EV Charging Infrastructure
For high-power EV charging stations, the system can help buffer charging demand, reduce peak grid pressure, and improve power availability where grid capacity is limited or costly to expand.
Designed for Capacity, Integration and Site Efficiency
For EPC contractors and project developers comparing a 6 MWh Battery Energy Storage System Container, this system provides 6.25 MWh rated energy in a compact 20ft enclosure. The AC/DC integrated design combines battery racks, PCS, EMS, liquid cooling, fire protection, and communication interfaces in one containerized battery energy storage system, reducing equipment matching work and field installation complexity.
6.25 MWh rated energy with LFP 3.2V / 587Ah cells
8P416S battery configuration and 95% depth of discharge
430 kW × 4 rated output power for grid-scale applications
Rack-level management for fault isolation and easier maintenance
Liquid cooling system for stable battery temperature control
Integrated PCS, EMS, fire protection, and communication interfaces for project deployment
Engineering Advantages for EPC and Project Developers
For EPC contractors sourcing a 6 MWh Battery Energy Storage System Container, capacity is only one part of the decision. Grid connection, installation access, protection design, communication compatibility, engineering review, commissioning support, and long-term O&M all affect project delivery. As a BESS container manufacturer, Polinovel focuses on integrated system configuration for large grid-connected battery storage projects.
Reduced Field Integration
The integrated container layout reduces the need to coordinate separate battery, PCS, EMS, cooling, fire protection, and communication systems from different suppliers, helping project teams simplify installation planning and site coordination.
Operation-Friendly Maintenance
Hot-swappable PCS, loaded isolation, unified interfaces, and automatic liquid replenishment help reduce manual maintenance pressure during daily operation and support long-term O&M planning.
Scalable Project Configuration
The modular container structure supports capacity expansion and repeatable deployment, making it suitable for phased storage projects, MWh-scale energy storage plants, and multi-container project configuration.
Safety Protection and Outdoor Site Adaptability
The 6 MWh Battery Energy Storage System Container combines LFP battery chemistry, liquid cooling, electrical protection, full-fluoroketone fire protection, smoke detection, and corrosion-resistant design for demanding outdoor energy storage environments. This liquid-cooled BESS container is suitable for projects that require stable operation under changing temperature, humidity, and site exposure conditions.
Environmental Protection
The container enclosure is rated IP55, with C4 / C5 corrosion protection for outdoor energy storage sites exposed to dust, humidity, and harsh operating environments.
PCS Protection
The PCS protection rating reaches IP66 C5, supporting stable operation in demanding outdoor environments where equipment reliability and corrosion resistance are important.
Wide Operating Range
The system supports -30°C to +50°C operation, 0–95% RH non-condensing humidity, and installation altitude up to 2000m for outdoor grid-connected BESS applications.
Project Selection Checklist
Before selecting a 6 MWh Battery Energy Storage System Container, project teams should match the system to actual grid conditions, load profile, installation site, dispatch strategy, and procurement requirements.
Define Project Use
Confirm whether the system will be used for renewable integration, peak shaving, load shifting, grid support, or EV charging load buffering.
01
Confirm Grid Data
Check grid voltage, frequency, transformer arrangement, interconnection conditions, and local grid compliance requirements.
02
Review Site Conditions
Evaluate temperature, humidity, altitude, corrosion exposure, available land area, installation access, and maintenance space.
03
Plan System Integration
Confirm EMS control logic, communication protocol, monitoring platform integration, dispatch strategy, and long-term operation process.
04
Configure Your 6 MWh Battery Energy Storage System Container Project
Polinovel can support utility companies, IPPs, EPC contractors, project developers, and energy storage integrators with project-based configuration for utility-scale storage plants, solar-plus-storage systems, industrial peak shaving projects, and grid-connected BESS applications. Share your grid data, site conditions, target storage duration, and application scenario to receive a technical proposal, project configuration, and quotation. Related product materials are available from the Polinovel download center.
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