Deye SE-G5.3 5.32kWh 51.2V LiFePO₄ Low-Voltage Lithium Battery

The Deye SE-G5.3 is a low-voltage lithium energy storage battery developed for residential and commercial solar energy systems where reliability, scalability, and long service life are critical. Built using cobalt-free lithium iron phosphate (LiFePO₄) cell technology, the SE-G5.3 delivers high safety, strong power density, and stable long-term performance under daily cycling conditions.

This battery integrates an intelligent Battery Management System and is designed for use with 48V-class hybrid and inverter-charger platforms.

System Role and Typical Applications

The SE-G5.3 stores energy generated by solar PV systems and supplies power during grid outages, load shedding, or peak consumption periods. It is suitable for residential backup systems, hybrid solar installations, and commercial energy storage systems where modular expansion and high reliability are required.

This is a low-voltage battery and is not intended for high-voltage inverter platforms.

51.2V Low-Voltage Battery Architecture

Operating at a nominal voltage of 51.2V, the battery falls within the standard low-voltage lithium category used by most residential and commercial hybrid inverters. This voltage class provides a balance between electrical safety, efficiency, and wide inverter compatibility.

LiFePO₄ Cell Technology and Long Cycle Life

The SE-G5.3 uses lithium iron phosphate cells that are free from cobalt and designed for high thermal stability and chemical safety. The battery is rated for more than 6000 cycles at 90% depth of discharge at 25°C, ensuring long-term daily operation with consistent capacity retention.

Usable energy capacity is approximately 4.79kWh under standard test conditions.

Smart BMS and Electrical Protection

An intelligent Battery Management System continuously monitors voltage, current, temperature, state of charge, and state of health. The BMS provides comprehensive protection against over-charge, over-discharge, over-current, short-circuit conditions, and abnormal temperature events.

Automatic cell balancing helps extend battery lifespan and maintain stable performance across all cells.

Parallel Expansion and Large-Scale Scalability

The Deye SE-G5.3 features a modular design that supports parallel connection of up to 64 battery units, allowing a maximum total storage capacity of approximately 340kWh. Up to 32 units can be connected without external setup, making the system suitable for both residential and commercial energy storage projects.

Inverter Communication and System Integration

The battery supports CAN2.0 and RS485 communication interfaces, enabling seamless integration with compatible hybrid and inverter-charger platforms. Remote monitoring and firmware upgrades are supported, including USB-based firmware updates for maintenance and system optimisation.

Installation Flexibility and Physical Design

The SE-G5.3 supports multiple installation methods, including 19-inch rack mounting, floor-mounted installation, and wall-mounted installation using supplied brackets. The compact 3U rack-style design makes it suitable for installations with limited space.

Natural air cooling is used to maintain reliable operation without the need for active cooling systems.

Technical Specifications – Deye SE-G5.3 Battery

Battery Identity

• Brand: Deye
• Model: SE-G5.3
• Cell chemistry: LiFePO₄

Electrical Ratings

• Nominal energy: 5.32 kWh
• Usable energy: 4.79 kWh
• Nominal voltage: 51.2 V
• Operating voltage range: 43.2 – 57.6 V
• Recommended depth of discharge: 90%

Charge and Discharge Performance

• Recommended charge/discharge current: 50 A
• Maximum charge/discharge current: 100 A
• Peak current: 120 A (30 seconds at 25°C)

Communication

• CAN2.0
• RS485

Physical and Environmental

• Installation type: 19-inch rack, wall-mounted, floor-mounted
• Dimensions: 440 × 133 × 560 mm
• Weight: approximately 45 kg
• Enclosure material: Metal
• Protection rating: IP20
• Cooling method: Natural cooling
• Charge temperature range: 0°C to 55°C
• Discharge temperature range: -20°C to 55°C
• Humidity range: 5% – 95%
• Maximum altitude: ≤2000 m

Lifecycle and Warranty

• Cycle life: ≥6000 cycles at 25°C, 0.3C, 90% DoD
• Manufacturer warranty: 10 years or 16 MWh energy throughput (whichever occurs first)