Sunsynk W5.3 5.32kWh 51.2V LiFePO4 Low Voltage Battery
Overview of the Sunsynk W5.3 5.32kWh Battery
The Sunsynk W5.3 5.32kWh battery is a low-voltage lithium iron phosphate (LiFePO4) energy storage solution designed for residential and small commercial solar and backup power systems. Operating at a nominal voltage of 51.2V, the Sunsynk W5.3 battery is engineered for daily cycling, high current capability, and long service life when paired with compatible low-voltage hybrid or off-grid inverters.
What the Sunsynk W5.3 Battery Is Designed to Do
The Sunsynk W5.3 5.32kWh battery stores DC electrical energy generated from solar panels or the grid and supplies that energy to a compatible inverter when required. It enables backup power during grid outages, improves solar self-consumption, and supports energy shifting in hybrid solar systems.
What the Sunsynk W5.3 Battery Is Not
The Sunsynk W5.3 battery is not an inverter and cannot produce AC power on its own. It does not contain MPPT charge controllers, grid synchronisation electronics, or AC output terminals. This is a low-voltage battery and must not be connected to high-voltage battery inverters.
System Type and Voltage Class
The Sunsynk W5.3 5.32kWh battery is designed for 48V-class low-voltage battery systems. With a nominal voltage of 51.2V and an operating voltage range of 43.2V to 57.6V, it integrates with low-voltage hybrid and off-grid inverters that support lithium batteries via CAN 2.0 or RS485 communication.
Battery Chemistry and Internal Protection
The Sunsynk W5.3 battery uses lithium iron phosphate (LiFePO4) chemistry, selected for its thermal stability, safety, and long cycle life. An integrated battery management system provides cell balancing, voltage protection, current limiting, and communication with the inverter to ensure stable and safe operation under varying load conditions.
Charge and Discharge Performance
The Sunsynk W5.3 5.32kWh battery supports a recommended continuous charge and discharge current of 50A, with a maximum continuous current of 100A and a peak current of 150A for short durations. This allows the battery to support high inverter loads and surge conditions commonly found in residential installations.
Scalability and Parallel Expansion
The Sunsynk W5.3 battery is designed for scalable energy storage. Up to 32 battery units can be connected in parallel, providing a maximum combined energy capacity of up to 170kWh while maintaining the same system voltage. This makes the Sunsynk W5.3 suitable for both small residential systems and larger multi-battery installations.
Communication and Monitoring
The Sunsynk W5.3 battery communicates with compatible inverters using CAN 2.0 and RS485 protocols. Integrated LED indicators provide local state-of-charge and system status information, while optional monitoring interfaces allow integration into supported inverter monitoring platforms.
Technical Specifications – Sunsynk W5.3 5.32kWh Battery
Battery chemistry: LiFePO4
Nominal battery voltage: 51.2V
Operating voltage range: 43.2V to 57.6V
Battery capacity: 104Ah
Total energy capacity: 5.32kWh
Usable energy capacity: 4.79kWh
Recommended depth of discharge: 90%
Recommended charge / discharge current: 50A
Maximum continuous charge / discharge current: 100A
Peak discharge current: 150A (2 minutes at 25°C)
Physical Specifications and Installation
The Sunsynk W5.3 battery is housed in a robust enclosure designed for wall-mounted installation. It supports installation in standard 19-inch battery cabinets and includes a DC 2P 125A circuit breaker for protection and isolation.
Mechanical Specifications
Dimensions (W × H × D): 440 × 620 × 135 mm
Weight: 46 kg
Ingress protection rating: IP65
Environmental Operating Limits
Charging temperature range: -10°C to 55°C
Discharge temperature range: -20°C to 55°C
Storage temperature range: 0°C to 35°C
Operating humidity range: 5% to 95%
Maximum operating altitude: 2000 m
Cycle Life and Longevity
The Sunsynk W5.3 5.32kWh battery is rated for at least 6000 cycles at 90% depth of discharge under controlled test conditions. The battery supports a lifetime energy throughput of 16MWh at 70% end-of-life capacity during the warranty period.
Typical Applications for the Sunsynk W5.3 Battery
Residential backup power systems
Hybrid solar energy storage systems
Off-grid low-voltage solar installations
Scalable lithium battery banks for homes and small businesses
FAQ
Frequently Asked Questions
Is the Sunsynk W5.3 an inverter?
No. The Sunsynk W5.3 is a battery only and must be used with a compatible inverter to supply AC power.
Is the Sunsynk W5.3 a low-voltage or high-voltage battery?
The Sunsynk W5.3 is a low-voltage battery operating at a nominal 51.2V and is intended for 48V-class inverter systems.
How many Sunsynk W5.3 batteries can be connected together?
Up to 32 Sunsynk W5.3 batteries can be connected in parallel, providing a combined energy capacity of up to 170kWh.
Which inverters are compatible with the Sunsynk W5.3 battery?
The battery is compatible with low-voltage hybrid and off-grid inverters that support lithium batteries via CAN 2.0 or RS485 communication, including compatible Sunsynk inverter models.
Can the Sunsynk W5.3 battery handle high power loads?
Yes. The battery supports up to 100A continuous current and 150A peak current, allowing it to support high inverter loads and short-term surge demands.
Does the Sunsynk W5.3 battery include protection?
Yes. The battery includes an integrated BMS with over-voltage, under-voltage, over-current, and temperature protection, as well as a built-in DC circuit breaker.
Can the Sunsynk W5.3 battery be used during grid outages?
Yes. When paired with a compatible inverter, the battery supplies stored energy during grid outages or when solar generation is unavailable.
Is the Sunsynk W5.3 suitable for outdoor installation?
The battery has an IP65 enclosure rating, making it suitable for protected outdoor installations when installed according to manufacturer guidelines.
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