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SunWell Energy

51.2V 20.48kWh LiFePO4 Battery

51.2V 20.48kWh LiFePO4 Battery

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Built as a floor-standing LiFePO4 battery, the 51.2V 20.48kWh LiFePO4 Battery brings dependable storage to homes, workshops and small businesses. Standard communication ports pair it with mainstream inverters for straightforward system integration. Owners use it to ride through outages and shift solar or grid energy into the evening peak.

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51.2V 20.48kWh LiFePO4 Battery — Technical Specifications
MODELSW-S-51.2/400-A
Rated Capacity400±5%Ah
Rated Voltage51.2V
Rated Energy20480Wh±5%
Max. Charge Voltage≈56.8V
Cut-Off Voltage≈44.8V
Standard Charge Current≤200A
Standard Discharge Current≤200A
Max.Continuous Discharge Current≤200A
Discharge Cut-Off Current220±5A
Cycle Life>8000 cycles @70% SOH
Net Weight146Kg
Gross Weight170Kg

Features

  • LiFePO4 chemistry delivers safe, long-lasting power. The cobalt-free cells resist thermal runaway and hold capacity through deep daily cycling, rated for years of daily cycling at high state of health.
  • Floor-standing cabinet sits stably in any corner. No racking is needed; the compact enclosure deploys quickly in homes, shops and small commercial spaces.
  • A multi-protocol BMS guards every cell. It tracks per-cell voltage, current and temperature, balances cells and blocks over-charge, over-discharge, over-current and short circuit, talking to inverters over CAN/RS485.
  • Long service life cuts ownership cost. Rated for years of daily cycling, it supports years of daily charge and discharge without premature replacement.
  • Wide operating range suits tough sites. It discharges from a wide temperature band and handles current, staying stable in unconditioned indoor and sheltered spaces.
  • Parallel-ready design grows with you. Add more units on the same bus to expand capacity while keeping the existing inverter and cabling.

Applications

  • Home Energy Storage: Stores solar and grid energy for whole-home use as a dedicated HOME ENERGY LITHIUM BATTERY.
  • Solar Self-Consumption: Pairs with PV to capture daytime solar and release it through the evening.
  • Off-Grid Homes: Supplies independent power for cabins and remote residences away from the grid.
  • Backup Power: Keeps lighting, refrigeration, and internet running through outages as part of an essential-load system.
  • Small Commercial Use: Powers tools and equipment at markets, workshops, and job sites without grid access.
  • Outdoor & Mobile Use: The 360° wheel base and −10°C discharge range suit sheltered outdoor and temporary setups.

Battery Safety & Protection

The SW-S-51.2-400-A is built around Lithium Iron Phosphate (LiFePO4) cells, a chemistry known for thermal stability and a low risk of thermal runaway compared with other lithium types. The cells sit inside a durable metal shell that protects the pack during transport and daily use in indoor and sheltered locations.

A built-in battery management system delivers over-charge, over-discharge, over-current, short-circuit, and temperature protection for safe operation. A touchscreen provides at-a-glance status monitoring, while the operating envelope—0°C to 45°C charging and −10°C to 55°C discharging—keeps the pack online through seasonal and site conditions.

Performance & Lifecycle Advantage

Rated at 20.48kWh (400Ah) with a 51.2V nominal output, the SW-S-51.2-400-A delivers steady, higher-demand energy through its ≤200A standard charge and discharge capability. A cut-off voltage of ≈44.8V and max charge voltage of ≈56.8V define a safe operating window, with a discharge cut-off current of 220±5A for overload protection.

The LiFePO4 chemistry provides a long service life of >8000 cycles at 70% SOH, supporting years of daily cycling. Mounted on a 360° universal wheel base at 1230×591×220mm and 146kg, the unit moves easily without fixed installation, and against lead-acid it offers lighter weight, lower maintenance, and better tolerance for frequent deep cycling.

Warranty

LiFePO4 batteries are backed by a 5-year warranty. If you experience any quality issues within the warranty period, please contact us and we will arrange a replacement or repair promptly.

Frequently Asked Questions

Will this battery work with my inverter?

It runs at 51.2V and is compatible with major inverter brands including GOODWE, SOFAR, GROWATT, AISWEI, INVT, SMA, Victron, MEGAREVO, PYLONTECH, LUXPOWERTEK, and Voltronic Power. Confirm your inverter's protocol during setup.

How long can it run my home?

With 20.48kWh (400Ah) stored, a 2.5kW load runs roughly 8 hours, covering evening use and overnight backup. The ≤200A rating sustains larger household and small-commercial loads without throttling.

How do I check its status and move it?

A built-in touchscreen shows real-time battery status at a glance, and the 360° universal wheel base lets you roll the 146kg unit into place without lifting.

What safety protections does it have?

A built-in BMS provides over-charge, over-discharge, over-current, short-circuit, and temperature protection. The LiFePO4 cells and durable metal shell add further stability for daily cycling.

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