Freen-BSL Energy Storage

The Freen-BSL is a low-voltage, modular sodium-ion battery system designed for safe, long-life energy storage in residential and small commercial installations. Built around advanced Na-ion chemistry, it offers exceptional thermal stability, wide operating temperatures, and long cycle life – without relying on lithium.

Engineered as a 48 V floor-mounted unit, Freen-BSL integrates seamlessly with hybrid and off-grid inverters, making it ideal for solar, wind, and hybrid renewable systems. Its scalable design allows you to start small and expand capacity as your energy needs grow.

Key Benefits

Safe Sodium-Ion Technology
Non-lithium chemistry with high thermal stability and reduced fire risk, designed for dependable operation even in demanding environments.

High Energy Efficiency
Round-trip efficiency above 97 %, ensuring minimal losses during charging and discharging.

Long Service Life
Over 10000 full cycles with ≥60 % remaining capacity, delivering reliable long-term storage performance.

Wide Temperature Tolerance
Operates in extreme climates — discharge possible from -40 °C to +65 °C, far beyond most conventional home batteries.

Modular & Scalable
Each unit provides 7.6 kWh, and up to 16 units can be connected in parallel, allowing systems up to 121.6 kWh while maintaining a safe 48 V architecture.

Technical Highlights

• Nominal Voltage: 48 V

• Usable Energy (per unit): 7.6 kWh

• Capacity: 158 Ah

• Max Continuous Power: 4.8 kW

• Max Current: 100 A

• Cooling: Natural convection (no fans)

• Installation: Indoor, floor-mounted

• Communication: CAN & RS485 for inverter integration

• Ingress Protection: IP20

Smart Battery Management

An advanced integrated BMS continuously monitors cell voltage, current, and temperature. It provides:

• Over-charge / over-discharge protection

• Short-circuit and over-current protection

• Active cell balancing

• Automatic shutdown under unsafe conditions

• Communication with compatible inverters and EMS systems

Ideal For

✔ Home solar energy storage
✔ Wind + battery hybrid systems
✔ Farms and remote properties
✔ Backup power and self-consumption optimization

Warranty

Backed by a long-term performance warranty with guaranteed retained capacity over time, giving confidence in long-term operation.