bigbattery|SKU:BNDL-B0011

BigBattery ETHOS 3x Expansion Kit

Expand Your Off-Grid Power With Confidence

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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

Expand Your Off-Grid Power With Confidence

The BigBattery ETHOS 3x Expansion Kit adds 10.24kWh of vetted LiFePO4 storage to your existing ETHOS system. Each 5.12kWh module features Tier 1 cells, built-in fire-extinguishing modules, and an IP65-rated enclosure built to handle demanding off-grid environments. This isn't just an add-on — it's a long-term investment in energy independence. With UL-certified connectors, advanced BMS monitoring, and parallel power cables included, scaling your battery bank is straightforward. Ships free.

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10.24kWh Total Capacity
Tier 1 LiFePO4 Cells
IP65-Rated Enclosure
Includes Rack Base
10.24kWh
Total Capacity
200A
Max Continuous Discharge
10240W
Max Continuous Power
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.

Compatibility Check

Confirm this expansion kit works with your existing ETHOS setup before ordering.

  • 48V ETHOS Control Box already installed
  • Existing stack below 80kWh total capacity
  • Parallel cable ports available on current ETHOS stack

Where This Kit Performs

Built for setups that demand reliable, scalable energy storage.

Grid-Tied Home Backup
Solar Energy Storage
Remote Off-Grid Cabins

Full specifications

At a glance

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

Dimensions

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)

Materials

Cell GradeTier 1 LiFePO4
Casing RatingIP65

Compliance & Warranty

ConnectorsUL-certified
Returns30-day hassle-free

The Off Grid Vault Promise

Every product we carry meets strict standards for real-world performance.

Vetted for QualityEach product is evaluated for build quality and field performance before it earns a spot in our catalog.
Free ShippingEvery order ships free with no minimums, no fine print, no hassle.
30-Day ReturnsNot the right fit? Return it within 30 days, hassle-free.

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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About bigbattery battery kit

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