12-Year Warranty

Full Battery Coverage

BigBattery ETHOS | 48V – 5.1kWh | UL1973 | UL9540A | Home Battery Backup LFP
BigBattery ETHOS | 48V – 5.1kWh | UL1973 | UL9540A | Home Battery Backup LFP - Image 2
BigBattery ETHOS | 48V – 5.1kWh | UL1973 | UL9540A | Home Battery Backup LFP - Image 3

Product Summary:

The BigBattery ETHOS™ is a leader in both on-grid and off-grid solar installations, known for its quality, value, ease of installation, proven reliability and safety record. Expandable up to 80+ kWh, ETHOS adapts to your energy needs-perfect for home backup, off-grid, and hybrid systems.

Designed with UL 9540 certification, advanced battery management, and U.S.-engineered design, ETHOS delivers reliable, maintenance-free performance with seamless integration into leading inverter systems.

  • Ships From: Texas, USA

  • Warranty: 12 Years

  • Support: Lifetime USA-Based Tech Support

Compatibility

UL 9540 Certified + Closed-Loop Communication (Grid-Tied):

  • EG4 18kPV

  • EG4 FlexBoss18

  • EG4 FlexBoss21

Closed-Loop Communication (Off Grid Non-UL 9540 Installs):

  • All BigBattery APEX Inverters

  • All EG4 Inverters

Key Features

  • LiFePO4 Battery Chemistry – Safe, stable lithium technology with long lifespan

  • 6,000+ Cycle Life – Built for years of daily use and long-term savings

  • Advanced BMS Protection – Full protection against voltage, current, and temperature risks

  • Outdoor-Ready Design – Built for durability in real-world environments along with indoor setup also

  • Modular Expansion – Easily increase capacity without replacing your system

  • Integrated Smart Control – Optimized performance with ETHOS controller

  • Fast Installation – Simplified, plug-and-play modular setup

  • Maintenance-Free – No routine servicing required

A future-ready battery platform built for energy independence-with the safety, support, and reliability you can trust.

BigBattery ETHOS | 48V – 5.1kWh | UL1973 | UL9540A | Home Battery Backup LFP

$2,990.00
SKU# K0948

Battery Selected

2× BigBattery ETHOS

Total Capacity

10.24 kWh

Choose Your Inverter Option*

EG4 12kPV EG4 18kPV EG4 FlexBoss18 EG4 FlexBoss21 None

Choose Your Battery Option*

BigBattery ETHOS EG4 280Ah All Weather EG4 280Ah Indoor EG4 314Ah All Weather EG4 314Ah Indoor None

Choose Your Inverter Option*

APEX-6.5K APEX-10K EG4 6000XP EG4 12000XP VICTRON MP II 3000 VICTRON MP II 5000 None

Choose Your Battery Option*

BigBattery NEXUS BigBattery ETHOS BigBattery HUSKY2 INV EG4 280Ah All Weather EG4 280Ah Indoor EG4 314Ah All Weather EG4 314Ah Indoor

Choose Your Battery Quantity*

Standard

Large

Complex

SKU: K0948-V Category:
30% Federal Tax Credit AvailableThis system qualifies for federal rebates.
Learn More Here
Quantity:

Compatible Accessories & Additional Add-ons

ETHOS- home battery backup
ETHOS- lithium battery storage
ETHOS- solar battery
ETHOS- lithium ion battery
ETHOS- lithium battery
ETHOS- lithium battery storage

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Battery Downloads

SKU#:K0949, K0950, K0951, K0953, K0150, K0151
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
UL9540A Certificate:DownloadDOWNLOAD
UL1973 Certificate:DownloadDOWNLOAD
UN38.3 Certificate:DownloadDOWNLOAD
Safety Data Sheet:DownloadDOWNLOAD
CEC Listing- BigBattery ETHOS:Go to linkGO TO LINK

Battery Specifications

GTIN-12 (U.P.C.):850061252005
System Voltage:48V
Nominal Voltage:51.2V
Chemistry:LiFePO4
kWh Capacity:10.24kWh (2x), 15.36 kWh (3x), 20.48 kWh (4x), 30.72 kWh (6x), 40.96 kWh (8x), 46.08 kWh (9x)
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
BMS Cutoff Range:42 – 47V
Cell Configuration:16S 
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)
Weight:273 lb (123.8 kg)
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 / NEMA 4X
Communications:CANBus / RS485
Certifications:UL9540, UL9540A, UL1973, & UN38.3

BigBattery batteries are backed by a 12-year warranty, giving you reliable long-term performance and confidence in every charge. Designed for durability and engineered to last, our batteries are built to power your setup for over a decade. For more information, please visit our policy page

ETHOS- home battery backup
ETHOS- lithium battery storage
ETHOS- solar battery
ETHOS- lithium ion battery
ETHOS- lithium battery
ETHOS- lithium battery storage

.

.

 

Battery Downloads

SKU#:K0949, K0950, K0951, K0953, K0150, K0151
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
UL9540A Certificate:DownloadDOWNLOAD
UL1973 Certificate:DownloadDOWNLOAD
UN38.3 Certificate:DownloadDOWNLOAD
Safety Data Sheet:DownloadDOWNLOAD
CEC Listing- BigBattery ETHOS:Go to linkGO TO LINK

Battery Specifications

GTIN-12 (U.P.C.):850061252005
System Voltage:48V
Nominal Voltage:51.2V
Chemistry:LiFePO4
kWh Capacity:10.24kWh (2x), 15.36 kWh (3x), 20.48 kWh (4x), 30.72 kWh (6x), 40.96 kWh (8x), 46.08 kWh (9x)
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
BMS Cutoff Range:42 – 47V
Cell Configuration:16S 
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)
Weight:273 lb (123.8 kg)
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 / NEMA 4X
Communications:CANBus / RS485
Certifications:UL9540, UL9540A, UL1973, & UN38.3

BigBattery batteries are backed by a 12-year warranty, giving you reliable long-term performance and confidence in every charge. Designed for durability and engineered to last, our batteries are built to power your setup for over a decade. For more information, please visit our policy page

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