Volta Stage 2 7.68kWh 51.2V LiFePO4 Low Voltage Battery

Overview of the Volta Stage 2 7.68kWh Battery

The Volta Stage 2 7.68kWh battery is a low-voltage lithium iron phosphate (LiFePO4) energy storage solution designed for residential and light commercial solar and backup power systems. Operating at a nominal voltage of 51.2V, the Volta Stage 2 battery offers increased capacity and discharge performance compared to smaller battery modules, making it suitable for homes with higher energy demands.

What the Volta Stage 2 Battery Is Designed to Do

The Volta Stage 2 7.68kWh battery stores DC electrical energy from solar generation or grid charging and supplies that energy to a compatible low-voltage inverter. It is designed to:

• Provide extended backup power during grid outages
• Support hybrid solar self-consumption systems
• Handle higher household loads with stable discharge performance
• Operate in residential and small commercial energy storage systems

What the Volta Stage 2 Battery Is Not

The Volta Stage 2 battery is a battery only and does not perform inverter functions. Specifically:

• It is not an inverter and cannot produce AC power
• It does not include MPPT charge controllers
• It does not provide grid synchronisation
• It must not be connected to high-voltage battery inverters

System Type and Voltage Class

The Volta Stage 2 7.68kWh battery is designed for 48V-class low-voltage battery systems. Key electrical characteristics include:

• Nominal battery voltage: 51.2V
• Compatible with low-voltage hybrid and off-grid inverters
• Parallel operation for capacity expansion

Battery Chemistry and Internal Protection

The Volta Stage 2 battery uses lithium iron phosphate (LiFePO4) cell technology for improved safety, thermal stability, and long cycle life. An integrated battery management system provides:

• Cell balancing and voltage monitoring
• Over-voltage and under-voltage protection
• Charge and discharge current protection
• Temperature monitoring and fault protection

Charge and Discharge Performance

The Volta Stage 2 7.68kWh battery supports high current operation suitable for residential inverter systems.

Charge Specifications

• Standard charge voltage: 56V
• Charge temperature range: 0°C to 65°C

Discharge Specifications

• Maximum continuous discharge current: 150A
• Discharge cut-off voltage: 44.8V
• Discharge temperature range: -20°C to 65°C

Scalability and Parallel Expansion

The Volta Stage 2 battery supports modular expansion through parallel connection. System scalability includes:

• Support for up to 8 batteries connected in parallel
• Increased total system energy capacity
• Retention of a 51.2V system voltage

Communication and Inverter Compatibility

The Volta Stage 2 battery supports communication with compatible inverters using:

• RS485
• RS232
• CAN (optional)

The battery management system is compatible with multiple inverter brands commonly used in South African installations.

Technical Specifications – Volta Stage 2 7.68kWh Battery

• Battery chemistry: LiFePO4
• Nominal energy capacity: 7.68kWh
• Nominal capacity: 150Ah
• Nominal voltage: 51.2V
• Cycle life: ≥ 6000 cycles at 80% depth of discharge

Physical Specifications and Installation

The Volta Stage 2 battery supports flexible installation methods depending on site requirements.

• Installation methods: Wall-mounted or floor-standing
• Dimensions: 480 × 650 × 180 mm
• Weight: 65 kg

Environmental Operating Limits

• Charge temperature range: 0°C to 65°C
• Discharge temperature range: -20°C to 65°C

Cycle Life and Service Life

The Volta Stage 2 7.68kWh battery is designed for daily cycling in residential energy storage systems and is rated for long-term operation under standard operating conditions.

Typical Applications for the Volta Stage 2 Battery

• Residential backup power systems
• Hybrid solar energy storage systems
• Low-voltage off-grid solar installations
• Scalable household energy storage solutions