
225 kWh Liquid-Cooled Sodium-Ion C&I Battery Energy Storage System
The 225 kWh Liquid-Cooled Sodium-Ion Battery Energy Storage System (BESS) is an all-in-one outdoor cabinet developed for modern C&I energy storage projects. It combines sodium-ion battery modules, liquid cooling, an intelligent BMS, fire protection and communication systems into one compact enclosure.
Designed for long-term operation in demanding environments, the system supports renewable energy integration, peak shaving, demand charge reduction, backup power, and microgrid applications.
Unlike conventional lithium battery systems, sodium-ion technology reduces dependence on lithium, nickel, and cobalt while providing excellent safety, strong low-temperature performance, and stable long-term operation.
Whether you are building a factory energy storage project, a solar + storage system, or an EV charging station, Bonnen Battery provides complete engineering support from battery design to system integration.
Free Custom Design
24/7 Engineer Support Services
Certification: Compliance with MSDS, UN38.3, CE, CB, IEC 62619, UL
Features of Bonnen Sodium-ion BESS
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System Overall Parameters
| Item | Specification |
| Rated Continuous Power | 110kW |
| Nominal System Energy | 225kWh (Actual: 226.76kWh) |
| Usable Energy (DOD=90%) | 204.08kWh |
| Battery Configuration | 9S1P (9 modules in series) |
| Nominal DC Voltage | 1333.8Vdc |
| DC Operating Voltage Range | 702Vdc ~ 1638Vdc |
| System Charge Cut-off Voltage | 1638Vdc |
| System Discharge Cut-off Voltage | 702Vdc |
| Recommended Charge/Discharge Current | 85A (0.5C) |
| Max Continuous Charging Current | 170A (1C) |
| Max Continuous Discharging Current | 255A (1.5C) |
| Short-term Peak Discharge Current | ≤340A (2C) |
| Battery Chemistry | Sodium-ion Battery |
| Total Battery Module Weight | 2556kg |
| Cooling Method | Liquid Cooling |
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Single Battery Module Parameters
| Item | Specification |
| Nominal Module Voltage | 148.2V |
| Nominal Capacity | 170Ah |
| Nominal Module Energy | 25.19kWh |
| Module Voltage Range | 78V ~ 182V |
| Charge Cut-off Voltage | 182V |
| Discharge Cut-off Voltage | 78V |
| Standard Charge/Discharge Current | 85A (0.5C) |
| Max Continuous Charging Current | 170A (1C) |
| Max Continuous Discharging Current | 255A (1.5C) |
| Peak Discharge Current | ≤340A (2C) |
| Module Internal Resistance | ≤15.6mΩ |
| Single Module Weight | 284kg |
| Cycle Life | ≥6000 cycles@100% DOD; ≥8000 cycles@80% DOD (25℃, 0.5C) |
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PCS AC Parameters
| Item | Specification |
| Rated AC Power | 110kW |
| AC Rated Voltage | 380/400Vac, 3P+N+PE, 50Hz |
| AC Voltage Tolerance | ±15% Un |
| Max AC Current | Approximately 159 A at 400 Vac / 167 A at 380 Vac |
| Power Factor | -0.9 to +0.9 (≥0.99 @ rated load) |
| AC Current THDi | <3% |
| Max PCS Efficiency | ≥98.4% |
| System Round-trip Efficiency | ≥88.0% |
| Operation Modes | Grid-tied peak shaving, PV-storage coupling, off-grid backup, demand response |
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Environmental & Mechanical Protection
| Item | Specification |
| Cabinet Type | Outdoor Integrated ESS Cabinet |
| Protection Grade | IP65 |
| Operating Temperature | -30℃ ~ +55℃ |
| Storage Temperature | -40℃ ~ +60℃ |
| Relative Humidity | 5%~95%, Non-condensing |
| Max Altitude | ≤3000m (Derating above 2000m) |
| Temperature Control | Liquid Cooling, Cell temperature difference ≤3℃ |
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Fire Safety & Protection System
| Item | Configuration |
| Early Warning System | Multi-level temperature & smoke early warning |
| Fire Suppression | Fluoroketone or FM-200, selected according to project requirements and local codes |
| Detection Sensors | Smoke, temperature, combustible gas, cabin pressure monitoring |
| Safety Device | Emergency stop, door access control, explosion relief valve |
| BMS Protection | Over charge/discharge, over current, over temperature, insulation detection |
| Cell Safety | Inherent safety, no fire/explosion under nail penetration test |
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Communication & Monitoring
| Item | Specification |
| Built-in System | EMS Energy Management System |
| Communication Interface | Ethernet, RS485, Dry contact |
| Communication Protocol | Modbus TCP/RTU is supported as standard. CANbus integration is available for customized projects. |
| Monitoring Function | Remote monitoring, remote upgrade, local data storage ≥90 days |
| Compatibility | Support PV inverter, distribution SCADA and cloud O&M platform docking |
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System Configuration

Standalone Use & Parallel Integration
Each sodium-ion energy storage cabinet is designed as a complete, standalone system with an integrated 110 kW PCS, battery management system, liquid-cooling system, fire-suppression system, and local control functions. A single cabinet can independently support peak shaving, load shifting, solar energy storage, backup power, and other commercial and industrial applications.
For larger projects, multiple cabinets can be connected in parallel on the AC side. Each cabinet keeps its own PCS and battery protection controls, while a site-level EMS coordinates charging, discharging, power allocation, operating schedules, and fault management across the full system.
This modular design allows project capacity and power to be expanded by adding more cabinets without changing the internal battery configuration of each unit. Cabinets can also be operated, maintained, or isolated individually, helping reduce system downtime and simplify future expansion.
The final number of cabinets, AC distribution design, transformer capacity, switchgear, communication architecture, and EMS strategy should be selected according to the site load profile, grid-connection requirements, available installation space, and required backup duration.


Reduced Supply Chain Risk: Avoid lithium market price spikes and supply bottlenecks using globally abundant sodium resources.
Streamlined On-Site Installation: Pre-wired, factory-tested outdoor cabinets require only AC/DC and comms hookups, cutting field labor costs by over 50%.
Lower Long-Term O&M: Liquid cooling reduces thermal stress, cutting cooling maintenance calls and filter replacements by 40%.
Safe 0V Transport & Storage: Sodium-ion batteries can be discharged to 0V for ocean transport, eliminating shipping fire risks and high storage costs.
High Round-Trip Efficiency (RTE): Uniform thermal management maintains system RTE above 88%, maximizing energy arbitrage returns.
Flexible One-Stop Customization: Bonnen handles custom pack design, custom enclosures, and software integration for both sodium and lithium projects.
Faster Project Payback: Lower initial purchase costs combined with utility demand charge savings reduce commercial payback to under 4 years.

The system is designed for a wide range of energy storage projects.
✅ Solar + Energy Storage
Store excess solar power during the day and use it when electricity prices are higher.
✅ Peak Shaving
Reduce peak demand charges and lower monthly electricity costs.
✅ Time-of-Use Energy Management
Charge during off-peak hours and discharge during expensive peak periods.
✅ Backup Power
Provide reliable emergency power during grid outages.
✅ Manufacturing Facilities
Improve power quality and reduce operating expenses.
✅ Industrial Parks
Support centralized energy management for multiple buildings.
✅ EV Charging Stations
Reduce grid impact during fast charging while improving energy utilization.
✅ Microgrids
Work with renewable energy, generators, and utility grids for reliable power supply.
Q1: What is a 225 kWh liquid-cooled sodium-ion C&I BESS?
A: A 225 kWh liquid-cooled sodium-ion C&I BESS is a commercial battery storage enclosure that uses sodium-ion cells and liquid cooling to store energy, reduce peak electric bills, and supply backup power for commercial buildings.
Q2: How does a liquid-cooled sodium-ion battery compare to a traditional LFP battery?
A: Compared to traditional LFP batteries, sodium-ion batteries cost 20–30% less in raw materials, work far better in sub-zero cold weather (retaining 85%+ capacity at -40°C), and carry zero risk of thermal runaway during 0V transport.
Q3: How much can a 225 kWh sodium-ion BESS reduce peak demand charges?
A: Based on field operational data, deploying a 225 kWh sodium-ion system for peak shaving cuts commercial peak demand charges by 25% to 35%, depending on local electric rates.
Q4: Can Bonnen Battery customize the 225 kWh system for specific project requirements?
A: Yes, we offer complete custom engineering. We can adjust system voltage, pack layout, EMS protocols, inverter matching, and cabinet paint/branding to fit your exact site specs.
Q5: How many steps are required to install and commission this system on site?
A: Installation requires just three steps: Step 1, set the pre-built cabinet on your concrete pad; Step 2, connect the main power cables and comms lines; Step 3, turn on power and complete automated EMS commissioning.
Q6: What is the cycle life and expected warranty of Bonnen’s sodium-ion BESS?
A: Bonnen sodium-ion systems deliver 6,000+ deep cycles at 100% DOD under standard conditions. Standard warranty and optional extended-warranty terms are determined by annual energy throughput, operating temperature, SOC window and end-of-warranty capacity.
Q7: How does liquid cooling improve performance over traditional air cooling?
A: Liquid cooling keeps cell-to-cell temperature differences under 3°C, lowers internal cooling energy draw by 30%, and extends total battery life by up to 20% compared to air-cooled cabinets.
Q8: Can Bonnen supply lithium-ion batteries if my project needs LFP or NMC?
A: Yes, Bonnen Battery manufactures both sodium-ion and custom lithium battery packs (LFP/NMC) for industrial, marine, and commercial projects.
Q9: What is the operating temperature range for this sodium-ion energy storage system?
A: The system operates smoothly from -30°C up to 55°C, making it an ideal choice for cold northern sites and hot outdoor environments.
Q10: How does this system integrate with existing rooftop solar PV installations?
A: The cabinet connects via Modbus TCP/RTU to standard hybrid inverters and site SCADA systems, automatically storing solar power during peak production and discharging during high-rate hours.
Q11: What fire safety systems are integrated into the cabinet?
A: Each cabinet features multi-layer fire safety including Automatic fluoroketone or FM-200 (selected according to project requirements and local code), integrated smoke/gas sensors, automated thermal disconnects.
Q12: Why choose sodium-ion over lithium for large-scale energy storage?
A: Sodium-ion offers lower raw material costs, higher thermal safety, superior cold-weather performance, and zero lithium supply chain bottlenecks.
Q13: How can project engineers request custom CAD files, single-line diagrams, or quotes?
A: You can visit bonnenbatteries.com or contact our engineering team directly to receive custom CAD drawings, single-line diagrams, and detailed pricing within 24 hours.

































