BigBattery ETHOS 20.2kWh Energy Storage System (4 Module Kit + 12kW Inverter)
Whole-Home Power System — Modular Storage Meets Intelligent Energy Control
Overview
The BigBattery ETHOS 20.2kWh system is a complete residential energy storage solution designed for both grid-tied and off-grid applications. Combining stackable LiFePO4 battery modules with a 12,000W hybrid inverter, it delivers a fully integrated system capable of powering entire homes, cabins, and high-demand environments.
Built for scalability, resilience, and long-term performance, the ETHOS transforms solar generation into reliable, controllable energy.
Why This System Works
Complete Energy System in One Package Includes battery storage, control system, and 12kW hybrid inverter
Powerful Output Performance Up to 10,240W continuous output with high surge handling
Modular & Scalable Design Expandable up to 16 parallel systems per control box
Advanced LiFePO4 Battery Chemistry Safe, long-lasting, and stable energy storage
Integrated Smart BMS Auto cell-balancing and full system protection
All-Weather Rated (IP65) Suitable for indoor or outdoor installation
Smart Energy Management Features AC coupling, peak shaving, load control, and UPS functionality
Multiple MPPT Inputs (3) Supports up to 18,000W solar array input
Real-Time Monitoring & Control LED interface + inverter touchscreen for full system visibility
System Role
Functions as a complete energy backbone, managing generation, storage, and distribution across your entire power system.
Integrates with:
Solar arrays (up to 18kW)
Grid power
Backup generators
Whole-home electrical systems
Key Specifications
Spec
Detail
Battery Type
LiFePO4
Nominal Voltage
51.2V
System Voltage
48V
Total Capacity
~20.2kWh (4 Modules)
Amp Hours
200Ah
Continuous Power Output
10,240W
Peak Discharge Current
300A (5 sec)
Max Charge Current
200A
Solar Input Capacity
Up to 18,000W
Inverter Output
12,000W
MPPT Inputs
3
Operating Voltage Range
48V – 57V
Temperature Range
-4°F to 140°F
Protection Rating
IP65
Certifications
UL9540, UL1973, UL9540A, UN38.3
Weight
273 lbs
Dimensions
43.3" × 26.5" × 6.7"
What’s Included
(4) 51.2V 100Ah ETHOS Battery Modules
(1) ETHOS Control Box
(1) ETHOS Rack Base
Parallel Power & Communication Cables
12kW Hybrid Inverter (Integrated System Pairing)
Ideal Applications
Whole-home backup power
Solar + storage systems
Off-grid homesteads
Cabins and remote properties
Grid-tied energy savings & peak shaving
Bottom Line
A fully integrated, scalable energy system that delivers serious power, intelligent control, and long-term reliability — built to run your home, not just support it.