All About EVE MB56 and S556H201 (Mr. Giant 5MWh): Specs, Features, Applications, and Benefits
2026.06.10
As wind and solar power continue expanding worldwide, reliable large-scale energy storage systems have become essential for stable energy utilization and grid balancing. However, traditional systems still face challenges such as high lifecycle costs, complex integration, and safety risks.
EVE Energy addresses these challenges head-on with the EVE MB56 prismatic LFP cell and our flagship system, the EVE S556H201 (Mr. Giant 5MWh) — purpose-built for high capacity, simplified deployment, and utility-scale performance.
What Are the EVE MB56 Cell and EVE S556H201 (Mr. Giant 5MWh)?
1. EVE MB56: The 628Ah Prismatic LFP Powerhouse
The EVE MB56 is a large-format prismatic lithium iron phosphate (LiFePO4) battery cell and the cornerstone of EVE Energy's flagship "Mr. Big" series. As the world's first mass-produced energy storage cell exceeding 600Ah, the MB56 represents a generational leap in cell-level energy density.
Key advantages of the EVE MB56 cell include:
l Large capacity: With a nominal capacity of 628Ah and single-cell energy of over 2.0 kWh, the MB56 offers roughly twice the capacity of conventional 300Ah/314Ah cells. For the same system capacity, fewer cells are required, which helps reduce pack complexity.
l Long cycle life: The MB56 supports ≥8,000 cycles under standard conditions, helping energy storage projects achieve longer service life, higher lifecycle discharge output, and lower total cost of ownership.
l High safety performance: Built on stable LFP chemistry, the MB56 combines thermal stability optimization with a reinforced separator design to reduce thermal runaway risks and support safer long-term operation.
l Simplified system design: Compared with 314Ah-based solutions, MB56-based systems can reduce the number of cells, connectors, cables, BMS collection points, and potential failure points. This helps lower installation difficulty and maintenance complexity.
l High energy efficiency: With low internal resistance and cell-level energy efficiency above 96%, the MB56 helps reduce energy loss during charge and discharge, supporting higher round-trip efficiency at the system level.
l Wide application scenarios: The MB56 is suitable for utility-scale ESS, renewable energy integration, commercial and industrial energy storage, microgrids, telecom backup power, and high-capacity residential or villa storage systems.
Key specifications of the EVE MB56 cell:
Parameter | Specification |
Nominal Capacity | 628 Ah |
Nominal Voltage | 3.2 V |
Single Cell Energy | ~2.009 kWh |
Dimensions (L×W×H) | 352.2 × 71.7 × 206.7 mm |
Weight | 11,500 g ± 300 g |
AC Internal Resistance | ≤ 0.25 mΩ |
Cycle Life | ≥ 8,000 cycles @ 70% SOH (25°C, 0.5P/0.5P) |
Charge Temperature | 0°C to 60°C |
Discharge Temperature | -30°C to 60°C |
Recommended Operating Temp. | 10°C to 45°C |
Charge/Discharge Rate | Standard 0.5P / 0.5P |
Energy Efficiency (25°C) | > 96% |
2. EVE S556H201: The Mr. Giant 5MWh Liquid-Cooled Container System
The EVE S556H201, commercially known as Mr. Giant, is EVE Energy's flagship DC liquid-cooled energy storage system built around the MB56 cells. Housed in a standard 20-foot container, it delivers 5,015 kWh of capacity in a compact, shipping-ready form factor designed for grid-scale and commercial deployment.
Key specifications of the EVE S556H201 (Mr. Giant 5MWh):
Parameter | Specification |
Model | S556H201 |
Nominal Capacity | 5,015 kWh (~5 MWh) |
System Voltage Range | 1,164.8 V – 1,497.6 V |
System Configuration | 1P416S × 6 |
Container Dimensions | 2,438 × 6,058 × 2,896 mm (Standard 20HC) |
Total Weight | ~45 T |
Charge/Discharge Rate | 0.5C / 0.5C |
System Energy Efficiency | ≥ 95% (field-measured: > 95.5%) |
Operating Temperature | -40°C to 55°C |
Operating Noise | < 65 dB |
Communication Interface | CAN |
Max Parallel Units | 4 |
Why Choose the EVE S556H201 (Mr. Giant 5MWh) System?
1. Economic Benefits
One of the biggest advantages of the Mr. Giant system is its ability to reduce the total lifecycle cost of energy storage projects.
By using EVE MB56 cells, the system cuts the number of battery cells, cables, BMS components, data collection points, and maintenance objects by 50% compared with traditional 314Ah systems. Fewer components mean lower installation costs, lower failure rates, and reduced maintenance complexity.
The simplified architecture also reduces annual labor requirements. According to industry data comparison, labor hours can decrease from 336 hours per year in conventional solutions to 232 hours per year with the Mr. Giant system.
In addition, the compact back-to-back container arrangement can save around 35% of land usage, which is especially valuable for utility-scale projects where land costs are significant.
For overseas markets, EVE also introduced the upgraded Mr. Giant Pro version with “5-year zero degradation” technology. This solution increases lifecycle discharge output by 16% compared to traditional solutions and further improves return on investment for long-duration storage projects.
2. Design and Integration Advantages
The S556H201 system is designed around the concept of extreme simplification. Thanks to the ultra-large-capacity MB56 cells and through-type large pack architecture, the system reduces:
l Battery cells
l PDU components
l BMS units
l Cables
l Data volume
l Fault points
l Maintenance objects
by approximately 50%.
This simplified design improves integration efficiency while lowering installation difficulty and long-term operational complexity.
Compared with traditional systems, the reduced component count also minimizes vulnerable parts and potential failure points, improving overall system reliability. Maintenance tasks such as troubleshooting, inspection, and replacement become significantly easier.
The standard 20-foot container design also simplifies transportation, deployment, and project scalability. The system supports parallel configurations of up to four containers, making it suitable for projects of varying scales.
3. Safety and Reliability
Safety is one of the most important considerations for utility-scale energy storage systems, and the Mr. Giant platform is designed with multi-dimensional protection mechanisms.
At the cell level, the EVE MB56 uses a reinforced 14μm separator and advanced thermal stability optimization to prevent thermal runaway propagation.
At the pack and system levels, the solution includes:
l Multi-stage short-circuit protection
l Intelligent linkage disconnection
l Isolation switches
l Multi-level fuse protection
l Real-time monitoring
l 24-hour fire protection systems
The container integrates multiple safety components, including smoke detectors, temperature detectors, explosion venting panels, fire alarm control systems, aerosol suppression, and water spray protection.
The system also complies with major international standards and certifications, including:
l TÜV Mark
l CB certification
l CE certification
l AS 3000
l UL 9540A-related testing
l NFPA 855 compliance
l CSA large-scale fire testing
These certifications demonstrate the system’s readiness for deployment in global energy storage markets.
4. Performance and Efficiency
The EVE S556H201 system is optimized for high efficiency and stable long-term operation.
The innovative current collection technology reduces battery impedance and improves round-trip efficiency (RTE). The system’s nominal efficiency reaches 95%, while actual operational projects have reported efficiencies exceeding 95.5% after months of grid-connected operation.
The liquid cooling system and advanced 3T thermal management design help maintain temperature differences within 3°C, improving operational consistency and battery lifespan.
The system also performs reliably under harsh environmental conditions, supporting operation from -40°C to 55°C. This makes it suitable for deployment in extremely cold or hot climates.
With a low operating noise level below 65dB, the system is also environmentally friendly for commercial and industrial installations.
Applications of the EVE S556H201 (Mr. Giant 5MWh) System
1. Grid-Scale Storage
The Mr. Giant system is designed for utility-scale storage and grid support applications.
One of the most notable deployments is the 400MWh independent energy storage power station in Hebei, China, recognized as the world’s first large-scale project using 628Ah battery technology. The project deployed 80 sets of the Mr. Giant 5MWh system.
The system supports grid frequency regulation, peak shaving, load balancing, and renewable energy stabilization, making it highly suitable for modern power infrastructure upgrades.
2. Solar and Renewable Integration
As renewable penetration increases globally, energy storage becomes essential for stabilizing intermittent solar and wind generation.
The S556H201 system stores excess renewable energy during peak generation periods and releases power during demand peaks or low renewable output periods.
EVE has already signed strategic cooperation agreements in Europe, including a 500MWh partnership with Polish energy company CommVOLT to support renewable integration and grid stability across Central and Eastern Europe.
3. Commercial and Industrial Energy Storage
Commercial and industrial facilities increasingly require flexible energy storage systems to reduce electricity costs and improve energy resilience.
The Mr. Giant solution supports:
l Peak-valley electricity price arbitrage
l Backup power
l Renewable self-consumption optimization
l Carbon reduction strategies
Its high efficiency, compact footprint, and simplified maintenance make it attractive for industrial parks, manufacturing facilities, and large commercial sites.
4. Utility Backup and Peak Shaving
The system is also well-suited for long-duration utility backup applications and peak shaving projects. With its 0.5C charge/discharge capability, the solution is optimized for applications requiring four or more hours of energy discharge.
In addition to utility grids, the system can support mission-critical infrastructure such as:
l Telecom facilities
l Data centers
l Power systems
l Emergency backup applications
The high safety standards and stable long-term performance of the prismatic LFP batteries make the platform particularly suitable for these demanding applications.
Global Deployment of the Mr. Giant 5MWh System
The Mr. Giant system has already entered multiple international markets, including China, Australia, Europe, and North America.
l In Australia, the system supports renewable integration and grid stabilization as traditional coal-fired power plants are gradually retired.
l In Europe, EVE continues expanding its localized service network while promoting commercial, industrial, and grid-scale ESS projects.
l In North America, EVE introduced the upgraded Mr. Giant Pro platform to address customer concerns regarding battery degradation and lifecycle economics.
The company has also secured multiple large-scale strategic agreements worldwide, including multi-GWh partnerships with leading renewable energy and ESS companies.
Conclusion
The EVE MB56 cell and the EVE S556H201 (Mr. Giant 5MWh) system represent a coherent and compelling answer to the efficiency, cost, and safety challenges that have constrained large-scale energy storage deployment.
By combining the world's first mass-produced 600Ah+ LFP cell with a minimalist system architecture, EVE Energy has created a platform that delivers 95%+ round-trip efficiency, 30% lower maintenance labor costs, and global certification compliance — all within a standard 20-foot container.
For ESS integrators, renewable developers, utility operators, and C&I energy managers evaluating their next large-scale storage investment, the Mr. Giant 5MWh system is a technically validated, commercially proven platform built for the demands of the clean energy transition.
For specifications, pricing, and project consultation, contact EVE!
Relevant information:
3. https://www.energy-x.org/news/eve-energy-mr-big-ultra-large-capacity-cell-mr-giant-5mwh.html
4. https://www.evebattery.com/en/news-1861
5. https://www.evebattery.com/en/news-1878
6. https://www.cnesa.org/information/detail/?column_id=4&id=6966
7. https://www.evlithium.com/lifepo4-battery-news/eve-energy-69mwh-bess-50gwh-esie-2026.html
