bigbattery|SKU:BNDL-B0012

BigBattery ETHOS 3x Expansion Kit

Scale Your Grid-Independent Power Safely

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

$4,833.95

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BigBattery ETHOS 3x Expansion Kit
BigBattery ETHOS 3x Expansion Kit
$4,833.95

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BigBattery ETHOS 3x Expansion Kit
BigBattery ETHOS 3x Expansion Kit
$4,833.95

Scale Your Grid-Independent Power Safely

The BigBattery ETHOS 3x Expansion Kit delivers 15.36kWh of additional capacity to your existing 48V system. Built with Tier 1 LiFePO4 cells and an IP65-rated casing, this vetted kit is designed for real-world durability. Each module features advanced BMS technology for precise monitoring, while UL-certified connectors guarantee secure power delivery. A smart investment for anyone expanding an off-grid proven setup, this kit includes three 5.12kWh modules, parallel cables, and a sturdy rack base to keep your system organized. Ships free with 30-day hassle-free returns. Financing available.

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
15.36kWh Capacity
Tier 1 LiFePO4 Cells
IP65-Rated Casing
Includes Rack Base
15.36kWh
Total Capacity
250A
Max Continuous Discharge
80kWh
Max System Expansion
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

Ensure this expansion kit integrates smoothly with your existing power infrastructure.

  • Existing 48V ETHOS Control Box installed
  • Current system capacity below 80kWh maximum
  • Compatible with 55.6V - 57V charging range

Built For Your Lifestyle

This curated expansion kit supports demanding environments and heavy power draws.

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

Full specifications

At a glance

Dimensions
See product page
Power
51.2V
Full specifications17 data points across 4 categories

Dimensions

DimensionsSee product page

Power & Performance

Nominal Voltage51.2V
ChemistryLiFePO4
kWh Capacity15.36kWh
Ah Capacity300Ah
Charging Voltage Range55.6 - 57V
Max Charge VoltageSee product page
Operating Voltage Range48 – 57V
Suggested Low Voltage Cutoff48 – 50.8V
BMS Cutoff Range42 - 47V
Cell Configuration16S 3P
Max Continuous Discharge Current250A
Max Continuous Power12800W
Max Discharge Peak Current300A (Max 5 seconds)

Materials

Casing RatingIP65-rated

Compliance & Warranty

ConnectorsUL-certified
Returns30-day hassle-free

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We stand behind every product we sell with straightforward policies.

Free ShippingShips free to your door with no minimums or hidden conditions.
Vetted QualityEvery item is inspected for real-world performance and build standards.
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 3x Expansion Kit Includes: 

  • 3 × 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)

3 Stack Specs:

 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
 BMS Cutoff Range:  42 – 47V
 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)
 Depth:  6.7 in (170 mm)
 Width:  26.5 in (674 mm)
 Height:  59.8 in (1520 mm)
 Max Connections:  Up to (16) parallel connections per control box
 Protection Rating:  IP65
 Communications:  CANBus / RS485

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About bigbattery battery kit

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