bigbattery|SKU:BNDL-B0011

BigBattery ETHOS 3x Expansion Kit

Scale Your Grid-Independent Power System

Restaurant-grade performance — sear at 1,000°F+ with infrared burners
304 stainless steel construction — rust-resistant, built to last decades
Ships fully assembled — wheel it out, fire it up same day
10-year warranty standard — industry-leading coverage on all burners

$3,306.95

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BigBattery ETHOS 3x Expansion Kit
BigBattery ETHOS 3x Expansion Kit
$3,306.95

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BigBattery ETHOS 3x Expansion Kit
BigBattery ETHOS 3x Expansion Kit
$3,306.95

Scale Your Grid-Independent Power System

Expand your off-grid proven energy reserves with this vetted BigBattery ETHOS expansion kit. Delivering 10.24kWh of reliable LiFePO4 storage, this curated package is a smart investment for homeowners and remote operators looking to scale up to 80kWh. Built with Tier 1 cells and an IP65-rated casing, it handles demanding environments without compromise. Ships free, and flexible financing options are available to help you secure your grid-independent power today.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
Tier 1 LiFePO4 Cells
10.24kWh Total Capacity
Built-In Fire Extinguisher
IP65-Rated Enclosure
10.24kWh
Total Capacity
200A
Continuous Discharge
51.2V
Nominal Voltage
BigBattery ETHOS 3x Expansion Kit

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

BigBattery ETHOS 3x Expansion Kit

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

BigBattery ETHOS 3x Expansion Kit

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

System Compatibility

Ensure your setup aligns with these core electrical parameters before integrating this expansion.

  • Operating voltage supports 48 – 57V range
  • Inverter accepts 200A continuous discharge current
  • Control box supports up to 80kWh expansion

Built For Real-World Demand

From daily solar storage to emergency backup, this modular kit adapts to your property's specific power requirements.

Solar Installations
Grid-Tied Residences
Remote Off-Grid Cabins
Commercial Establishments

Full specifications

At a glance

Dimensions
See product page
Power
51.2V
Warranty
See product page
Full specifications16 data points across 4 categories

Dimensions

Module DimensionsSee product page

Power & Performance

Nominal Voltage51.2V
ChemistryLiFePO4
kWh Capacity10.24kWh
Ah Capacity200Ah
Charging Voltage Range55.6 - 57V
Operating Voltage Range48 – 57V
Suggested Low Voltage Cutoff48 – 50.8V
Cell Configuration16S 2P
Max Continuous Discharge Current200A
Max Continuous Power10240W
Max Discharge Peak Current300A (Max 5 seconds)
Max ChargeSee product page

Materials

Casing RatingIP65-rated

Compliance & Warranty

ConnectorsUL-certified
WarrantySee product page

The Off Grid Vault Promise

Every product we carry earns its place through rigorous evaluation.

Vetted for QualityWe only stock systems with proven real-world performance and reliable build standards.
Ships FreeYour expansion kit ships free with no minimums or hidden conditions.
30-Day ReturnsEnjoy a hassle-free 30-day return window if this kit doesn't fit your system.

Welcome to the forefront of energy storage innovation with the BigBattery 48V ETHOS systems. These battery modules form the backbone of adaptable power solutions suitable for a wide range of applications, including grid-tied residences, solar installations, remote off-grid locations, and commercial establishments across the country. Featuring Tier 1 LiFePO4 cells, renowned for their safety and durability, and offering scalability up to 80kWh per Control Box, the ETHOS system sets a new standard for dependable energy storage solutions.

  • Scalable Power: 5.12kWh modules – single stack, expandable up to 80kWh per ETHOS Control Box.
  • Safety First: Tier 1 LiFePO4 cells and built-in fire-extinguishing modules ensure maximum safety.
  • Smart Monitoring: Advanced BMS technology provides real-time monitoring of voltage, current, and temperature.
  • Reliable Connectivity: UL-certified connectors ensure secure and reliable power connections.
  • Durable Design: IP65-rated casing protects against the elements for long-lasting reliability.
  • Versatile Applications: Ideal for emergency backup or as part of a solar energy system.

Designed For:

  • 48V Applications
  • Residential Power Systems
  • Home Solar Systems
  • UL-Certified ESS
  • Cabins & Tiny Homes
  • Family Homes & Mansions
  • Off-Grid Homesteads
  • Emergency Power
  • Whole Home Backup
  • Lead Acid Replacement

BigBattery ETHOS 2x Expansion Kit Includes: 

  • 2 × 48V ETHOS 5.12kWh Stackable Battery Module
  • 2 × Ethos Parallel Power Cable 4.9 ft (1500mm)
  • 1 × ETHOS Rack Base
  • 1 × Ethos Parallel Comm Cable 4.9 ft (1500mm)

2 Stack Specs:

SKU: BNDL-B0011
System Voltage: 48V
Nominal Voltage: 51.2V
Chemistry: LiFePO4
kWh Capacity: 10.24kWh
Ah Capacity: 200Ah
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 2P
Max Continuous Discharge Current: 200A
Max Continuous Power: 10240W
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)
Depth: 6.7 in (170 mm)
Width: 26.5 in (674 mm)
Height: 43.3 in (1100 mm)
Max Connections: Up to (16) parallel connections per control box
Protection Rating: IP65
Communications: CANBus / RS485
Certifications: UL9540, UL9540a, UL1973, & UN38.3

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