Freen-BSC Sodium-ion Battery Energy Storage Container

The Freen-BSC is a containerized sodium-ion battery energy storage system engineered for solar parks, wind farms and utility-connected projects at megawatt-hour scale. A standard 20-foot High Cube container arrives on site as a prefabricated DC power block: twelve liquid-cooled battery strings, three-tier management, four levels of fire protection and full thermal control, ready to connect to your PCS and step-up substation.

Built on advanced sodium-ion chemistry, it brings the thermal stability and long cycle life of the Na-ion platform to grid-scale storage without lithium, cobalt or nickel. Where a cabinet serves one site, the BSC serves a park, and it does so at a cost per kilowatt-hour that no modular architecture can match.

Key Benefits

Service Life Measured in Decades

Rated for 8,000 or more full cycles with capacity retention above 70 %. At one cycle a day that is more than twenty years of operation, which is the horizon a park is financed against.

Four Levels of Fire Protection

Designed with disaster-prevention specialists from State Grid. Detection and suppression at pack level, the same at string level, a passive gas system in the electrical compartment and a water sprinkler system above. This is a level of protection cabinets cannot physically accommodate.

Liquid Cooling That Buys You Life

A dual-circuit 40 kW chiller with redundancy, a variable-speed inverter compressor and a 1.5 kW dehumidifier hold the temperature spread inside each pack within 3 °C. Against air cooling that adds at least 15 % to battery service life. A 20 kW heating circuit covers cold-climate sites.

Prefabricated, So the Schedule Shrinks

Factory-assembled and shipped as one unit. The design cuts project footprint by more than 20 % and installation time by 40 %, with over 30 % space saved through internal layout. Flatbed transport, no on-site integration crew.

Deep Cold Without Preheating

Discharge from −40 °C to +60 °C. The wide sodium voltage window means the full capacity is available, not a protected slice of it, and no energy is spent warming the cells before they work.

High Round-Trip Efficiency

Above 98 % DC efficiency, with a three-tier BMS managing 4,992 cells at 3 % state-of-charge accuracy and 5 % state-of-health accuracy.

Technical Highlights

• Nominal Energy: 2.28 MWh
• Nominal Voltage: 1,189.7 V
• DC Operating Range: 624 – 1,435.2 V
• Configuration: 1P416S × 12 strings
• Cell Type: Sodium-ion, 2.86 V / 160 Ah
• Pack: 1P52S, 148.7 V, 23.79 kWh, 318 kg, IP65
• String: 190.36 kWh, 2,544 kg, 8 packs + HV box + 8 MSD
• Charge / Discharge Rate: 0.5C
• Charge Cut-off: 1,435.2 V or 3.45 V per cell
• Discharge Cut-off: 624 V or 1.5 V per cell
• DC Efficiency: ≥ 98 %
• Cooling: 40 kW dual-circuit chiller + 1.5 kW dehumidifier + 20 kW heating
• Temperature Spread in Pack: ≤ 3 °C
• Fire Protection: Four levels, including water sprinkler
• Container: 6,058 × 2,438 × 2,896 mm, 20 ft High Cube
• Weight: ≤ 43 t
• Noise: 75 dB at 1 m
• Ingress Protection: IP54, anti-corrosion C3
• Communication: CAN / RS485 / TCP-IP
• Supplied by customer: PCS and step-up substation

Engineered Safety and System Management

The BSC uses a three-tier BMS architecture of BMU, BCU and BAMS, managing 4,992 cells across twelve strings. Each battery box carries 38 temperature sensing points, positioned using computational fluid dynamics rather than guesswork.

• Cell and pack voltage monitoring across all 4,992 cells
• Insulation detection and high-voltage interlock
• Over-charge, over-discharge and over-current protection
• Short-circuit and over-temperature protection
• Fault data logging with local display and remote escalation
• Manual service disconnects on every pack
• Smoke, heat and gas detection feeding the EMS
• Flame-retardant materials throughout equipment, boxes, cabinets and cabling

Sodium-ion chemistry is what makes this safety case straightforward rather than expensive. The cells do not sustain combustion, do not release oxygen under abuse, and can be transported and stored at zero volts, which removes an entire class of risk from a site holding 2.28 MWh.

Ideal For

✔ Solar and wind park storage

✔ Grid balancing and frequency response

✔ Energy trading and tariff arbitrage

✔ Industrial park and campus microgrids

✔ Large-scale peak shaving

✔ Regions where fire risk governs the permit

Warranty

Freen-BSC is covered under Freen’s long-term limited product warranty, with manufacturer support and guaranteed retained capacity for stationary energy storage.