Product Summary:
The BigBattery NEXUS™ + EG4 12000XP ESS System is a powerful, scalable energy solution designed for both on-grid and off-grid applications. Combining high-capacity 15kWh NEXUS LiFePO₄ battery modules with the advanced EG4 12000XP hybrid inverter, this system delivers reliable, efficient energy for whole-home and commercial backup.
The EG4 12000XP provides up to 12,000W split-phase output per inverter with up to 24,000W PV input, enabling high solar production and seamless power management between solar, battery, and grid. With dual MPPTs, built-in breakers, and fast UPS switching (15–30ms), the system ensures uninterrupted power and optimized performance.
Expandable from 15kWh up to 225kWh and scalable up to 36kW output, the NEXUS battery system grows with your energy needs while delivering long-lasting, maintenance-free storage. Built with advanced battery protection, safe lithium technology, and U.S.-supported engineering, this system is ideal for residential, commercial, and off-grid energy independence.
Ships From: Texas, USA
Warranty: 12 Years (Battery), 5 Years (Inverter)
Support: Lifetime USA-Based Tech Support
Compatibility
Integrated & Optimized System:
- EG4 12000XP Hybrid Inverter + NEXUS 15kWh Battery Modules
Expandable Design:
- Scale battery storage from 15kWh up to 225kWh
- Supports multiple inverters up to 36kW system output
- Compatible with grid-tied, hybrid, and off-grid installations
Key Features
- Complete ESS Solution – Battery + inverter system designed to work seamlessly together
- 12,000W Output per Inverter – Reliable split-phase power for residential and commercial systems
- 24,000W PV Input – High solar capacity with dual MPPT optimization
- 15kWh LiFePO₄ Battery Modules – Safe, high-capacity energy storage with long lifespan
- 6,000+ Cycle Life – Built for years of daily use and long-term savings
- UPS Backup (15–30ms) – Seamless transition during outages
- Smart Energy Management – Supports load control, AC coupling, and peak shaving
- Built-In Breakers & Safety Protections – Simplifies installation and enhances system safety
- Modular Expansion – Easily scale storage and output as energy needs grow
- Remote Monitoring & Control – Real-time system tracking and performance insights
- Maintenance-Free Operation – No routine servicing required
A high-capacity, scalable energy storage system built for performance, flexibility, and long-term energy independence – ideal for powering homes and businesses with confidence.
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, 100A continuous discharge, and peak support up to 110A, 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
DOWNLOADBattery Specifications
Inverter Downloads
GO TO LINKInverter Specifications
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 policy page
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, 100A continuous discharge, and peak support up to 110A, 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
Battery Specifications
Inverter Downloads
Inverter Specifications
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 policy page
