6.25MWh Battery Storage Container
The 6.25MWh Battery Storage Container is a high-energy-density, liquid-cooled lithium battery system designed for utility-scale and large commercial energy storage projects. Built as a DC-side battery storage container, it delivers stable, safe, and efficient energy storage for solar, wind, grid support, and industrial power applications.
With advanced LFP battery technology and a fully integrated thermal and safety management system, this 20ft battery storage container enables higher energy output in a compact footprint while supporting flexible PCS configuration at the project level.
Optimized for Your Energy Needs
High-Efficiency Energy Architecture
The system integrates battery modules, BMS, liquid cooling, and fire protection into a unified architecture, improving energy utilization and reducing system-level losses in large-scale battery energy storage container deployments.
01
Harsh Environment Operation
The battery storage container is engineered for outdoor deployment with IP55 protection, wide temperature tolerance (-30°C to 55°C), and high-altitude adaptability, making it suitable for diverse global energy storage markets.
02
Multi-Level Battery Protection
The container integrates battery monitoring, thermal management, fire detection, and fire protection systems. These protection layers help reduce operational risk and support safer long-term use in utility-scale energy storage projects.
03
Lower Lifecycle Energy Cost
High-density LFP battery storage, efficient liquid cooling, and containerized delivery help reduce installation complexity, support long-term reliability, and improve the overall cost performance of large energy storage projects.
04
6.25MWh Battery Storage Container Specification
| System Parameters | |
| Battery Chemistry | LFP |
| Cell Capacity | 587Ah |
| Configuration | 8 × 1P416S |
| Nominal Energy | 6250kWh |
| Cooling Method | Liquid Cooling |
| Coolant | Ethylene Glycol Aqueous Solution |
| Gravimetric Energy Density | ≥130Wh/kg |
| Volumetric Energy Density | ≥145Wh/L |
| Area Energy Density | ≥423kWh/m² |
| Electrical Parameters | |
| Nominal Voltage | 1331.2V |
| Operating Voltage Range | 1040–1500V |
| Delivered Nominal SOC | 27% |
| Rated Charge / Discharge Rate | 0.5P / 0.5P |
| Energy Efficiency | ≥94% |
| Environmental Conditions | |
| Operating Temperature | -30°C to 55°C |
| Recommended Storage Temperature | -20°C to 35°C |
| Application Altitude | ≤4000m |
| Mechanical Parameters | |
| Dimensions (L × W × H) | 6058 × 2438 × 2896mm |
| Weight | ≤48000kg |
| Protection Rating | IP55 |
| Certifications | |
| Product Certifications | GB/T 36276-2023, GB 44240-2024, GB/T 44026-2024 |
| Company Certifications | ISO 9001, ISO 14001, ISO 45001, SA 8000 |
Why Choose the Polinovel 6.25MWh Battery Storage Container
Six reasons utility, EPC and developer buyers specify this container for grid, renewable and large C&I projects.
High Energy Density in a 20ft Container
Stores 6.25 MWh in a single standard 20ft enclosure, cutting the number of units needed per MWh and reducing land use, civil works and cabling on constrained sites.
Intelligent Liquid Cooling
Ethylene-glycol liquid cooling holds cell temperature within a tighter band for more uniform aging, longer usable life and safer operation than air-cooled designs.
Multi-Layer Safety Protection
Battery monitoring, thermal management and fire detection with protection layered up to container level, addressing the concerns that drive permitting, insurance and grid acceptance.
Integrated BMS, Cooling & Fire Protection
Battery, BMS, thermal management and fire protection ship as one containerized DC system, reducing on-site matching, wiring and responsibility gaps.
Lower LCOS and Simplified O&M
High integration, ≥94% energy efficiency and smart monitoring are designed to lower lifecycle cost and speed fault diagnosis, improving project economics over the asset life.
Fast Deployment and Flexible Layout
Factory-integrated construction cuts field wiring and commissioning time, while back-to-back or side-by-side arrangement adapts the container to different site geometries and access roads.
Common Challenges in Utility-Scale BESS Projects
How the Polinovel 6.25MWh liquid-cooled container answers the friction points that slow large storage projects.
Land and footprint pressure
Every extra container adds land, cabling and civil cost. The 6.25 MWh liquid-cooled container stores more per unit, helping reduce site count and layout complexity.
Safety and permitting risk
Fire, thermal runaway and insurance concerns can stall approvals. Polinovel answers with layered detection and protection plus a certification document package on request.
Integration and responsibility gaps
Mixing battery, PCS and EMS from different vendors creates matching and warranty ambiguity. The DC-side all-in-one container consolidates the system boundary.
Slow on-site commissioning
Field wiring and testing extend EPC schedules. Factory-integrated construction and factory acceptance testing shorten on-site work.
Uncertain lifecycle cost
Investors need LCOS clarity. Efficient liquid cooling, ≥94% energy efficiency and simplified O&M are designed to protect project economics.
Supplier reliability doubts
Buyers need confidence a factory can deliver and customize. Polinovel offers factory-direct supply, OEM/ODM and export-ready packaging.
All-in-One 6.25MWh Battery Storage Container for Grid & Renewable Projects
The Polinovel 6.25MWh Battery Storage Container is a complete, containerized DC-side energy storage system rather than a bare battery box. Inside a standard 20ft enclosure, LFP 587Ah battery racks are combined with an intelligent BMS, a liquid-cooled thermal management loop and a multi-layer fire-protection system - all pre-assembled and factory-tested.
This system-level approach targets the biggest friction points in utility-scale deployment: site footprint, safety compliance, integration complexity and commissioning time. As a factory-direct manufacturer and OEM/ODM partner, Polinovel supports PCS matching, grid-connection documentation and project-based supply. The result is a utility-scale storage solution that developers, IPPs, EPC contractors and integrators can specify, procure and deploy with fewer unknowns.
Integrated battery, BMS, liquid cooling and fire protection in one 20ft DC unit
Ethylene-glycol liquid cooling for stable, long-life operation
1040–1500V operating window for flexible PCS matching and multi-container expansion
Multi-layer safety architecture with battery, thermal and fire monitoring
Factory-direct supply with OEM/ODM and export-ready packaging
6.25MWh Battery Storage Container Key Features
High-Capacity LFP Battery Racks
Built around LFP 587Ah cells in an 8 × 1P416S configuration, delivering 6250 kWh in a compact 20ft footprint.
Value: chemistry-level safety margin, fewer units per MWh, lower balance-of-system cost.
Intelligent Liquid Cooling
An ethylene-glycol liquid-cooled loop actively manages heat to keep cell temperature difference tight across the pack.
Value: uniform aging, reduced hot spots, longer usable life and stronger LCOS.
Multi-Layer Fire Protection
Battery, thermal and fire detection combine with container-level fire protection for early detection and containment.
Value: smoother permitting, insurance and grid acceptance.
Integrated BMS
Multi-level BMS provides protection, balancing and monitoring across the battery system with granular visibility.
Value: faster fault location and lower O&M labor.
DC-Side PCS Matching
A 1040–1500V DC window (1331.2V nominal) lets the container interface with compatible PCS platforms.
Value: grid-code alignment and simpler system matching.
Transport-Ready 20ft Design
Standard 6058 × 2438 × 2896mm form factor supports back-to-back or side-by-side layout and conventional container shipping.
Value: site adaptability, predictable logistics, export-ready packaging.
6.25 MWh Battery Energy Storage Container Application
Solar-plus-Storage
Smooths PV output, boosts self-consumption, reduces curtailment and shifts generation to evening peaks.
Wind-plus-Storage
Buffers wind volatility and supports stable grid connection and frequency response.
Grid Support
Provides frequency regulation, voltage support, capacity reserve and T&D deferral.
Peak Shaving
Uses peak shaving to cut demand charges and flatten load profiles for large C&I and industrial parks.
Microgrid / Island Grid
Delivers stable power and renewable integration for microgrid, off-grid, weak-grid, island and mining sites.
Data Center / AIDC
Strengthens supply resilience, provides peak support and dispatchable backup for high-density loads.
Comparison of 6.25 MWh Battery Energy Storage Containers and Traditional Standalone Solutions
| Factor | Polinovel 6.25MWh Container | Traditional standalone solutions | B2B Buyer Benefit |
|---|---|---|---|
| Energy per 20ft unit | 6.25 MWh high density | ~3–5 MWh legacy units | Fewer units per MWh, smaller footprint |
| Cooling | Ethylene-glycol liquid cooling | Air-cooled | Tighter ΔT, longer life |
| Efficiency | ≥94% energy efficiency | Typically lower system RTE | Better LCOS / ROI over asset life |
| Integration | Battery / BMS / cooling / fire in one DC system | Separately sourced | Simpler matching, clearer warranty boundary |
| Deployment | Factory-integrated, factory-tested | Field-assembled | Less on-site work, faster commissioning |
| Protection | IP55, multi-layer safety | Basic / partial | Easier permitting and insurance |
| Supply model | Factory-direct + OEM/ODM | Trader / reseller | Direct pricing, customization, traceability |
Explore Energy Storage Solutions
Certified Safety and Quality Control
Polinovel builds every 6.25MWh Battery Storage Container under a quality-controlled production process designed to reduce procurement risk and support project acceptance. Battery packs, insulation withstand, BMS communication, liquid-cooling pressure and fire-linkage functions are verified through in-line inspection and factory acceptance testing, with documentation available to support engineering review and tender submissions.
Because grid-connected projects hinge on compliance, Polinovel treats certification as a document deliverable rather than a marketing claim. The product is certified to GB/T 36276-2023, GB 44240-2024 and GB/T 44026-2024, and the company holds ISO 9001, ISO 14001, ISO 45001 and SA 8000. Additional international certification documentation can be discussed per project scope.
Polinovel OEM/ODM & Delivery Capability
As a factory-direct BESS container manufacturer, Polinovel supplies the
6.25MWh Battery Storage Container for project-based procurement - stable,
repeatable supply for developers, EPC contractors, integrators and distributors.
Factory-direct supply and factory quote by model, quantity and specification
OEM/ODM support for configuration, branding and documentation
Custom packaging and export-ready shipping
Sample and pilot-batch discussion for qualified projects
Bulk order and multi-container project supply
Flexible MOQ and lead-time discussion per project
FAT reports and quality traceability
Technical communication before production
FAQ
Q: What is the 6.25MWh Battery Storage Container?
A: It is a 20ft, liquid-cooled, LFP-based DC battery container from Polinovel that integrates battery racks (LFP 587Ah, 8 × 1P416S), BMS, thermal management and fire protection into one factory-tested unit for utility-scale, renewable and large C&I projects.
Q: What battery chemistry and cell are used?
A: LFP (LiFePO4) 587Ah cells, selected for cycle life and thermal stability, delivering a nominal 6250 kWh. Full cell details are on the datasheet.
Q: What is the voltage window and efficiency?
A: Nominal voltage is 1331.2V with a 1040–1500V operating range, and energy efficiency is ≥94%. The DC-side design allows matching with compatible PCS platforms.
Q: What are the rated charge/discharge rates?
A: The container is rated at 0.5P / 0.5P. Duration configuration for a specific project can be confirmed with a Polinovel engineer.
Q: Is it suitable for harsh outdoor environments?
A: Yes. It is IP55-rated, operates from -30°C to 55°C and is suitable up to 4000m altitude, making it appropriate for diverse global markets.
Q: What certifications does it hold?
A: Product certifications include GB/T 36276-2023, GB 44240-2024 and GB/T 44026-2024; company certifications include ISO 9001, ISO 14001, ISO 45001 and SA 8000. A certificate package is available on request.
Q: Do you support OEM/ODM?
A: Yes. Polinovel offers OEM/ODM support for configuration, branding, packaging and documentation to suit project requirements.
Q: Can I request samples, and what is the MOQ / lead time?
A: Sample and pilot-batch options can be discussed for qualified projects. MOQ and lead time are discussed per project and quantity - send your requirements for a factory quote.
Q: How is it shipped and installed?
A: As a standard 20ft container (6058 × 2438 × 2896mm, ≤48000kg) with export-ready packaging, then placed, connected and commissioned on site with remote support. Request the installation guide for details.
Ready to plan your 6.25MWh storage project?
Send your site conditions, required capacity and discharge duration, and the Polinovel engineering team will recommend a suitable configuration, confirm PCS compatibility and outline certification and delivery. Whether you are an IPP, EPC contractor or integrator, we help you move from technical review to a firm quotation with clear documentation.
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