BigBattery 48V 15kWh NEXUS LiFePO4 Battery

Designed for off‑grid solar, commercial backup, and home emergency power, the NEXUS system is a scalable energy storage solution that delivers dependable, long‑duration energy where you need it most. It combines safety‑focused LiFePO4 chemistry with a rugged, floor‑standing chassis and modular expansion to 215 kWh.

Key performance and specifications

• System voltage: 48 V; Nominal voltage: 51.2 V; Chemistry: LiFePO4
• Usable energy: 15 kWh; Ah capacity: 280 Ah; Cell configuration: 16S1P
• Max continuous discharge: 100 A; Max discharge power: 7.6 kW; Max discharge peak: 110 A
• Max charge current: 100 A; Charging voltage range: 53.5–57.6 V; Operating range: 48–57.6 V; Max charge voltage: 57.9 V
• Temperature ranges: Charge 0–45°C; Discharge −20–45°C; Storage (SoC >50%) −20–25°C
• Physical specs: Weight ~142.8 kg; Dimensions 19.7 × 27.5 × 15.7 in; IP21 protection; Altitude <2000 m
• Communication: RS485, RJ45, CAN; Parallel expansion up to 15 units (215 kWh)

Safety, protection, and certifications

Integrated BMS with quadruple safety redundancies provides cell balance, over‑current, over‑voltage, and thermal protection. Certifications include UN38.3 for safe air transport, and the IP21 rating suits indoor installations in controlled environments.

Installation, maintenance, and support

Indoor floor‑standing design with included hardware enables straightforward setup in tech closets, garages, cabins, or sheds. For installation and ongoing maintenance, refer to the User Manual and Spec Sheet (Click Here) for wiring diagrams, commissioning steps, and firmware updates.

What’s included

• Energy storage box: 51.2 V, 300 Ah, 15 kWh capacity; includes fire extinguisher (aerosol) & heater

BigBattery 48V 15kWh NEXUS LiFePO4 Battery

Nexus is the most affordable 15kWh LiFePO₄ off-grid powerhouses with a portable, compact build, and scalability to 215kWh for unstoppable outdoor home or cabin backup power.

Key Features

• Performance: Uninterrupted, long-lasting power for any off-grid application.
• Chemistry: Advanced LiFePO4 for safety and longevity.
• Design: Rugged, floor-standing design for easy installation in tech closets, garages, cabins, or sheds.
• Protection: Integrated BMS with quadruple safety redundancies.
• Scalability: High-capacity, expandable storage solution up to 215kWh.
• Applications: Off-grid solar, commercial backup, and home EPS.

Sleek & Compact Design

Our stackable, compact design comes with all the hardware you need for a straightforward setup, letting you get your off-grid system up and running efficiently in less time. Engineered for reliability in any off-grid environment, it delivers consistent power when you need it most.

Off-Grid Energy Reliability

With 280 Ah of capacity, 100 A continuous discharge, and peak support up to 110 A, NEXUS handles high-demand loads with ease. NEXUS’s smart thermal management enables charging from 32 °F to 113 °F and discharging down to -4 °F, making it a true all-weather energy solution.

Modular ESS That Grows With You

NEXUS supports parallel expansion up to 15 units, offering 215kWh total capacity. With RS485, CAN, and RJ45 communication ports, it’s ready to integrate seamlessly into new or existing inverter systems—ensuring full system transparency, automation, and control.

Legacy Product Parallel Compatibility

What's included:

51.2V 300AH-15KWH Energy storage box, with fire extinguisher (aerosol) & heater