Big Battery 48V ETHOS 15.3KWH (3 Module)
Power your home, cabin, or off-grid setup with the BigBattery 48V ETHOS 15.3kWh System, featuring three stackable 5.12kWh LiFePO4 battery modules. Designed for scalability, safety, and long-term reliability, this system provides robust backup, solar storage, and off-grid energy with UL-certified safety, integrated BMS, and fire suppression. Whether you're replacing lead-acid or upgrading your solar system, the ETHOS ensures efficient and secure energy storage for any 48V application.
BigBattery 48V ETHOS 15.3kWh (3 Module) Features
High-Capacity Storage – Provides a total of 15.36kWh from three 5.12kWh modules—ideal for home backup, solar storage, or full off-grid living.
Stackable & Modular Design – Add modules as needed and scale up to 80kWh per control box for large systems or growing power needs.
Tier 1 LiFePO4 Cells – Safe, stable lithium iron phosphate chemistry offers 7,000–8,000 cycles at 80% DoD, ensuring 10+ years of reliable performance.
Integrated Smart BMS – Real-time monitoring of voltage, temperature, and current, plus passive balancing and built-in safety protections.
UL-Certified & Fire Suppression – Meets UL1973, UL9540A, and UN38.3 certifications and includes an internal fire-extinguishing module.
Weather-Resistant & Wall-Mountable – Features an IP65-rated enclosure, included mounting brackets, and a space-saving design for indoor or outdoor installation.
BigBattery 48V ETHOS 15.3kWh (3 Module) Applications
- Designed for 48V Applications – Perfect for residential, solar, and off-grid systems using 48V architecture.
- Residential Power Systems – Store energy for time-of-use optimization or backup during outages.
- Home Solar Systems – Capture and store excess solar energy for nighttime or grid-free use.
- UL-Certified ESS – Fully compliant for code-approved installs.
- Cabins & Tiny Homes – Ideal for efficient off-grid living in small or mobile dwellings.
- Family Homes & Mansions – Scalable capacity supports large household energy demands.
- Off-Grid Homesteads – Power remote homes independently of the grid.
- Emergency Power – Always-on backup when disaster strikes.
- Whole Home Backup – Use multiple modules to power essential or full home circuits.
- Lead Acid Replacement – Upgrade to modern lithium performance and longevity.
- Intense Heat & Cold – Built for extreme climates with wide operating temperature tolerance.
What's Included
Everything you need is included with your product.
- 3 × 48V ETHOS 5.12kWh Stackable Battery Module
- 1 × ETHOS Control Box
- 1 × 15kWh Ethos Controller to Battery Power Cable 4ft (1220mm)
- User Manual
BigBattery 48V ETHOS 15.3kWh (3 Module) Specifications
| Category | Specifications |
| SKU | K0950 |
| UPC | 850061252166 |
| System Voltage: | 48V |
| Nominal Voltage: | 51.2V |
| Chemistry: | LiFePO4 |
| kWh Capacity: | 15.36kWh |
| Ah Capacity: | 300Ah |
| Charging Voltage Range: | 55.6 - 57V |
| Max Charge Voltage: | 57V |
| Operating Voltage Range: | 48 – 57V |
| Suggested Low Voltage Cutoff: | 48 – 50.8V |
| Cell Configuration: | 16S 3P |
| Max Continuous Discharge Current: | 250A |
| Max Continuous Power: | 12800W |
| Max Discharge Peak Current: | 300A (Max 5 seconds) |
| Max Charge Current: | 200A |
| Charge Temperature Range: | 32°F - 113°F (0°C - 45°C) |
| Discharge Temperature Range: | -4°F - 140°F (-20°C - 60°C) |
| Optimal Discharge Temperature Range: | 59°F - 95°F (15°C - 35°C) |
| Storage Temperature Range (SoC >50%): | -4°F - 113°F (-20°C - 45°C) (Max 6 months) |
| Dimensions (DxWxH) | 6.7 x 26.5 x 59.8 in (170 x 674 x 1520 mm) |
| Weight | 387 lbs (175.5 kg) |
| Max Connections | Up to (16) parallel connections per control box |
| Communications | CANBus / RS485 |
| Protection Rating | IP65 |
| Certifications | UL9540, UL9540a, UL1973, & UN38.3 |
BigBattery 48V ETHOS 15.3kWh (3 Module) Videos
Frequently-Asked Questions
Can I add more modules to this setup?
Yes. The ETHOS system is expandable—up to 80kWh per control box—so you can scale as your energy needs grow.
Is this compatible with my 48V inverter?
Most likely. ETHOS works with many major 48V inverters. Be sure to check your inverter’s voltage and current specs to confirm compatibility.
Is the battery weatherproof?
Yes, with its IP65-rated enclosure, the ETHOS is protected from dust and water spray—safe for both indoor and sheltered outdoor use.
Does this system require an external BMS?
No. Each module includes a fully integrated Battery Management System, eliminating the need for external components.