BigBattery NEXUS 48V LiFePO4 Battery (15kWh)
Scalable Energy Storage — Compact Powerhouse for Off-Grid & Backup Systems
Overview
The BigBattery NEXUS is a high-capacity 48V lithium energy storage system designed for off-grid living, backup power, and scalable solar applications. With 15kWh of usable energy and a rugged, floor-standing design, it delivers reliable performance in residential, cabin, and light commercial environments.
Built with LiFePO4 chemistry and intelligent battery management, the NEXUS offers long lifespan, safety, and seamless system integration.
Why This System Works
-
High-Capacity Energy Storage
15kWh of usable power supports extended runtime for homes and systems
-
Scalable Architecture
Expand up to 215kWh (15 units in parallel) for large energy demands
-
Reliable Power Output
Handles continuous discharge with strong peak support for high-load appliances
-
Advanced LiFePO4 Chemistry
Safe, stable battery technology with long lifecycle performance
-
Integrated Smart BMS
Built-in protections with multiple safety redundancies
-
All-Weather Performance
Operates in a wide temperature range for year-round reliability
-
Compact Floor-Standing Design
Easy installation in garages, cabins, or utility spaces
-
Seamless System Integration
Compatible with most inverters via RS485, CAN, and RJ45 communication
System Role
Functions as a core energy storage unit, storing and delivering power for off-grid and hybrid systems.
Integrates with:
- Solar arrays
- Hybrid inverters
- Backup generators
- Whole-home and cabin energy systems
Key Specifications
| Spec |
Detail |
| Battery Type |
LiFePO4 |
| Nominal Voltage |
51.2V |
| Capacity |
280Ah |
| Energy Storage |
15kWh |
| Max Continuous Discharge |
100A |
| Max Discharge Power |
7.6kW |
| Peak Discharge |
110A |
| Max Charge Current |
100A |
| Operating Voltage Range |
48V – 57.6V |
| Temperature Range |
-4°F to 113°F (discharge) |
| Parallel Capacity |
Up to 15 Units (215kWh) |
| Communication |
RS485 / CAN / RJ45 |
| Installation |
Indoor, Floor-Standing |
| Weight |
~315 lbs |
| Dimensions |
19.7" × 27.5" × 15.7" |
What’s Included
- 48V 15kWh Battery Unit
- Integrated BMS
- Built-in Heater
- Internal Fire Suppression (Aerosol)
- Communication Ports & Hardware
Ideal Applications
- Off-grid homes and cabins
- Solar + storage systems
- Backup power solutions
- Scalable energy storage builds
- Light commercial applications
Bottom Line
A compact, scalable lithium battery system that delivers dependable, long-lasting energy storage — built for off-grid reliability and system expansion.
