48V 15kWH NEXUS LiFePO4 Battery - Image 2

Product Summary:

Nexus is the most affordable 15kWh LiFePO₄ off-grid powerhouses with a portable, compact build, and scalability to 225kWh 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 225kWh.
Applications: Off-grid solar, commercial backup, and home EPS.

Whats included:

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

48V 15kWH NEXUS LiFePO4 Battery

$2,980.00

SKU# F-NXUS-48150-G1

Choose Your Inverter Option

EG4 12kPV EG4 18kPV EG4 FlexBoss18 EG4 FlexBoss21 None

Choose Your Battery Option*

BigBattery ETHOS EG4 280Ah All Weather EG4 280Ah Indoor EG4 314Ah Indoor None

Choose Your Inverter Option

APEX-6.5K APEX-10K EG4 6000XP EG4 12000XP None

Choose Your Battery Option*

BigBattery NEXUS BigBattery ETHOS BigBattery HUSKY2 INV EG4 280Ah All Weather EG4 280Ah Indoor

Choose Your Battery Quantity*

Standard

Large

Complex

SKU: F-NXUS-48150-G1 Category: Off-Grid

Introducing the Nexus

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 300Ah of capacity, 140A max continuous discharge, and peak support up to 270A, 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 225kWh total capacity per inverter. 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

The NEXUS is compatible and parallel-able with all existing KONG and GRIZ products purchased between 2019-2024.

Battery Downloads

SKU#:F-NXUS-48150-G1

Spec Sheet:

DOWNLOAD

User Manual:

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Battery Specifications

Battery Specifications:NEXUS 15KWh

System Voltage:48V

Nominal Voltage:51.2V

Chemistry:LiFePO4

Usable Energy (kWh):15kWh

Ah Capacity:300Ah

Cell Configuration:16S1P

Max Continuous Discharge Current:140A

Max Continuous Power:7.6kW

Max Discharge Peak Current:270A(1s)

Max Charge Current:140A

Charging Voltage Range:53.5V-57.6V

Operating Voltage Range:48V-57.6V

Max Charge Voltage:57.9V

Suggested Low Voltage Cutoff:50.8V

Charge Temp Range:32°F to 113°F

Discharge Temp Range:-4°F to 113°F

Optimal Discharge Temp:59°F to 95°F

Storage Temp Range (SoC >50%):(1 month: -4°F ~ 113°F | 3 months: -4°F ~ 95°F | 6 months: -4°F ~ 77°F)

Humidity Range:10%-95% (No Condensation)

Weight (lbs):~315 lbs

Dimensions (WxHxD):19.7 x 27.5 x 15.7 in (500×700×400 mm)

Altitude Limit:<2000m

Max Connections:15 in parallel (up to 225kWh)

Communications:RS485 / RJ45 / CAN

Protection Rating:IP54

Installation:Indoor Floor-standing

BigBattery batteries are backed by a 12-year warranty, giving you reliable long-term performance and confidence in every charge. Designed for durability and engineered to last, our batteries are built to power your setup for over a decade. For more information, please visit our <a href=”https://bigbattery.com/policies/”>policy</a> page