BigBattery ETHOS 3× Expansion Kit (15.36kWh Add-On Storage)

Modular Energy Expansion — Stack More Power, Stay Powered Longer

Overview

The BigBattery ETHOS 3× Expansion Kit is designed to significantly increase your system’s energy storage capacity by adding 15.36kWh of additional LiFePO4 battery power. Built as a seamless extension of the ETHOS platform, this kit enables deeper energy independence, longer backup duration, and more efficient solar utilization.

With a modular, stackable design and rugged construction, it transforms your base system into a scalable energy solution ready for real-world demand.

Why This System Works

• Massive Capacity Expansion
  Adds 15.36kWh of storage with three 5.12kWh modules
• Scalable Energy Architecture
  Expand up to 4 total stacks for growing energy needs
• High-Performance LiFePO4 Chemistry
  Long lifespan, stable performance, and enhanced safety
• Smart Battery Management System (BMS)
  Ensures cell balancing, system protection, and optimal performance
• Weatherproof IP65 Enclosure
  Suitable for both indoor and outdoor installations
• Real-Time System Monitoring
  Integrated LED display provides live system data
• Advanced Communication Integration
  CANBus and RS485 support for inverter and system compatibility

System Role

Functions as a modular expansion layer for ETHOS energy systems, increasing total storage capacity and runtime.

Integrates with:

• ETHOS base battery systems
• Hybrid inverters
• Solar arrays
• Whole-home or off-grid energy setups

Key Specifications

What’s Included

• (3) 5.12kWh ETHOS Battery Modules
• Integrated BMS
• Stackable Hardware & Connections
• Monitoring Interface

Ideal Applications

• Whole-home backup systems
• Solar energy storage expansion
• Off-grid homes and cabins
• Energy resilience upgrades
• Load-heavy or extended runtime systems

Bottom Line

A powerful expansion kit that multiplies your energy storage capacity — giving you longer runtime, greater independence, and a system that grows as your needs evolve.