EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating
EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating - Image 2
EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating - Image 3
EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating - Image 4
EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating - Image 5
EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating - Image 6

Product Summary:

The EG4 314Ah WallMount Indoor LiFePO₄ Battery delivers smart power and simple reliability for homeowners and small businesses looking to reduce energy costs and stay protected during outages. With 16kWh of storage capacity and 200A continuous output, it provides dependable whole-home backup in a compact, space-saving design.

 

Built with advanced LiFePO₄ battery chemistry, this system offers 8,000+ cycles at 80% depth of discharge, ensuring long-term performance and value. An intelligent Battery Management System (BMS) with real-time monitoring and an integrated LCD touchscreen makes system control and visibility simple and intuitive.

 

Designed for safe indoor installation, the battery features automatic self-heating for cold environments and an emergency stop (E-Stop) for rapid shutdown when needed. With RS485 and CANBus communication, it integrates seamlessly with leading hybrid inverters for flexible grid-tied and off-grid applications.

Ships From: Texas, USA
Warranty: 10 Years
Support: Lifetime USA-Based Tech Support

 

Compatibility

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

  • EG4 FlexBoss18

  • EG4 FlexBoss21

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

  • All BigBattery APEX Inverters

  • All EG4 Inverters

Key Features
  • 16kWh LiFePO₄ Battery – High-capacity, safe lithium storage
  • 200A Continuous Output – Powers whole-home loads and critical systems
  • 8,000+ Cycle Life – Long-lasting performance at 80% DoD
  • UL-Certified Design – Built for safe, code-compliant installations
  • Advanced BMS Monitoring – Real-time performance tracking and protection
  • LCD Touchscreen Display – Easy system control and diagnostics
  • Automatic Self-Heating – Reliable operation in cold environments
  • Emergency Stop (E-Stop) – Rapid shutdown for enhanced safety
  • RS485 & CANBus Communication – Seamless inverter integration
  • Wall-Mount Indoor Design – Clean, space-saving installation
  • Maintenance-Free Operation – No routine servicing required

A powerful, space-efficient battery solution built for reliable backup, energy savings, and long-term performance.

EG4-WallMount Indoor Battery | 48V 314Ah | 16kWh | UL9540A | Self-Heating

$3,727.99
SKU# FEWMT-48161-G1

Choose Your Inverter Option*

EG4 12kPV EG4 18kPV EG4 FlexBOSS18 EG4 FlexBOSS21 None

Choose Your Battery Option*

BigBattery ETHOS EG4 280Ah All Weather EG4 314Ah All Weather EG4 314Ah Indoor

Choose Your Battery Quantity*

Standard

Standard

Large

Large

Complex

Complex

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

Standard

Large

Large

Complex

Complex

SKU: FEWMT-48161-G1 Categories: ,
Free Shipping on orders $5000+

Introducing The EG4 WallMount Indoor Battery

Latest BMS Technology

Third-Generation BMS: Provides advanced monitoring, improved balancing precision, and faster response times for greater safety and system efficiency.

All-Weather Self-Heating

Self-Heating Function: Maintains optimal performance and battery health in cold environments.

Your Personal Power House

200A Continuous Output / 12.8kW Peak Power: Supports heavy household loads and seamless backup operation.

Show off your build!

Community sparks inspiration, if you’d like to take pride in presenting your set up, submit your build to us for a chance to be featured and win a BigBattery mystery gift. Enter your build here.

Key Features:

  • Cross-Compatible with Other EG4 Models: Seamlessly integrates with existing
    EG4 battery systems for flexible scaling and expanded storage capacity. (Note: UL9540 Certified only with Flexboss 18 & Flexboss 21)
  • Hybrid Wall or Floor Mount Design: Flexible installation options with a durable,
    space-saving enclosure (IP20 rated).
  • High-Capacity Storage: 16kWh nominal energy and 314Ah capacity for
    reliable, high-output performance.
  • Auto-ID Technology: Automatically recognizes and syncs new batteries during
    installation, simplifying system setup and configuration.

Battery Downloads

SKU#:FEWMT-48161-G1
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
Quick Start Guide:DownloadDOWNLOAD
Certification of Compliance:DownloadDOWNLOAD
Certification of Conformity:DownloadDOWNLOAD

Battery Specifications

Product Type:Low Voltage LFP Battery
Battery Type:Lithium Iron Phosphate (LFP)
Model Number:WM-48-314-IN-XX (XX is a number between 00 – 99)
Nominal Energy Capacity:16kWh
Usable Energy (DOD%):12.86kWh (80% recommended)
Voltage Range:47.5 – 57.6 VDC
Nominal Voltage:51.2 VDC
Capacity:314Ah
Charging Voltage Range:56 – 57 VDC
Discharging Cut-off Voltage:47.5 VDC
Max Continuous Charge Current:157A
Max Continuous Discharge Current:200A
Continuous Charge/Discharge Power:8/10.2 kW
Recommended Charging/Discharging Rate:0.5C
Peak Power:12.8kW (3 sec)
Round-trip Efficiency:95%
Max Parallel Units:16
Protection Features:Over/Under Voltage, Over-Current, Short Circuit, High/Low Temp
Battery Management System (BMS):Integrated, Active Balancing
Communication Protocols:RS485, CAN
Battery Breaker:250A
Storage Temperature Range**:-4 – 131°F (-20 – 55°C)
Humidity Range:5% – 95% RH (non-condensing)
Altitude:9843 ft. (<3000 m)
Cooling Method:Natural Convection
Dimensions (H × W × D):34.1 in. × 18.1 in. × 9.6 in. (865 mm × 460 mm × 245 mm)
Operating Temperature Range:Charge: 32 – 122°F (0 – 50°C); Discharging: -4 – 131°F (-20 – 55°C)
Recommended DOD Setting Note*:EG4 recommends this value be set no lower than 20% to maintain the recommended 80% Depth of Discharge.
Storage Temperature Note**:Less than 3 months of storage. If longer than 3 months, recommended storage temperature will be 59°F – 86°F (15°C – 30°C).
Weight:293.2 lbs. (133 kg)
Enclosure Rating:IP20
Mounting Options:Wall/Floor mount
Display/Indicators:LED Status
Connector Type:Degson quick connector/screw terminal
UL 1973:Yes
UL 9540:DC ESS, AC ESS with EG4 18kPV, 12kPV, FlexBOSS 21, FlexBOSS 18*
UL 9540A:Batt to Batt spacing of 6 in.
UN 38.3:Yes
FCC Part 15 (EMC):Yes
Protection Class:Class B
Cycle Life (70% EOL Capacity):10000 cycles @ 0.5C, 25°C, 80% DOD
Design Life*:10 years
Warranty:10 years or 10000 cycles
Application Type:Residential/Commercial/Off-grid/Backup
Lifetime Energy Throughput (Calculated):(51.2V×314Ah/1000×80%×10000/1000)90% = 115.7 MWh or (12861 kWh×10000 cycles×90% efficiency) = 115.7 MWh
Note:Information subject to change without notice.

 

EG4 WallMount Indoor Battery: 10-Year EG4 Manufacturer Warranty

Introducing The EG4 WallMount Indoor Battery

Latest BMS Technology

Third-Generation BMS: Provides advanced monitoring, improved balancing precision, and faster response times for greater safety and system efficiency.

All-Weather Self-Heating

Self-Heating Function: Maintains optimal performance and battery health in cold environments.

Your Personal Power House

200A Continuous Output / 12.8kW Peak Power: Supports heavy household loads and seamless backup operation.

Show off your build!

Community sparks inspiration, if you’d like to take pride in presenting your set up, submit your build to us for a chance to be featured and win a BigBattery mystery gift. Enter your build here.

Key Features:

  • Cross-Compatible with Other EG4 Models: Seamlessly integrates with existing
    EG4 battery systems for flexible scaling and expanded storage capacity. (Note: UL9540 Certified only with Flexboss 18 & Flexboss 21)
  • Hybrid Wall or Floor Mount Design: Flexible installation options with a durable,
    space-saving enclosure (IP20 rated).
  • High-Capacity Storage: 16kWh nominal energy and 314Ah capacity for
    reliable, high-output performance.
  • Auto-ID Technology: Automatically recognizes and syncs new batteries during
    installation, simplifying system setup and configuration.

Battery Downloads

SKU#:FEWMT-48161-G1
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
Quick Start Guide:DownloadDOWNLOAD
Certification of Compliance:DownloadDOWNLOAD
Certification of Conformity:DownloadDOWNLOAD

Battery Specifications

Product Type:Low Voltage LFP Battery
Battery Type:Lithium Iron Phosphate (LFP)
Model Number:WM-48-314-IN-XX (XX is a number between 00 – 99)
Nominal Energy Capacity:16kWh
Usable Energy (DOD%):12.86kWh (80% recommended)
Voltage Range:47.5 – 57.6 VDC
Nominal Voltage:51.2 VDC
Capacity:314Ah
Charging Voltage Range:56 – 57 VDC
Discharging Cut-off Voltage:47.5 VDC
Max Continuous Charge Current:157A
Max Continuous Discharge Current:200A
Continuous Charge/Discharge Power:8/10.2 kW
Recommended Charging/Discharging Rate:0.5C
Peak Power:12.8kW (3 sec)
Round-trip Efficiency:95%
Max Parallel Units:16
Protection Features:Over/Under Voltage, Over-Current, Short Circuit, High/Low Temp
Battery Management System (BMS):Integrated, Active Balancing
Communication Protocols:RS485, CAN
Battery Breaker:250A
Storage Temperature Range**:-4 – 131°F (-20 – 55°C)
Humidity Range:5% – 95% RH (non-condensing)
Altitude:9843 ft. (<3000 m)
Cooling Method:Natural Convection
Dimensions (H × W × D):34.1 in. × 18.1 in. × 9.6 in. (865 mm × 460 mm × 245 mm)
Operating Temperature Range:Charge: 32 – 122°F (0 – 50°C); Discharging: -4 – 131°F (-20 – 55°C)
Recommended DOD Setting Note*:EG4 recommends this value be set no lower than 20% to maintain the recommended 80% Depth of Discharge.
Storage Temperature Note**:Less than 3 months of storage. If longer than 3 months, recommended storage temperature will be 59°F – 86°F (15°C – 30°C).
Weight:293.2 lbs. (133 kg)
Enclosure Rating:IP20
Mounting Options:Wall/Floor mount
Display/Indicators:LED Status
Connector Type:Degson quick connector/screw terminal
UL 1973:Yes
UL 9540:DC ESS, AC ESS with EG4 18kPV, 12kPV, FlexBOSS 21, FlexBOSS 18*
UL 9540A:Batt to Batt spacing of 6 in.
UN 38.3:Yes
FCC Part 15 (EMC):Yes
Protection Class:Class B
Cycle Life (70% EOL Capacity):10000 cycles @ 0.5C, 25°C, 80% DOD
Design Life*:10 years
Warranty:10 years or 10000 cycles
Application Type:Residential/Commercial/Off-grid/Backup
Lifetime Energy Throughput (Calculated):(51.2V×314Ah/1000×80%×10000/1000)90% = 115.7 MWh or (12861 kWh×10000 cycles×90% efficiency) = 115.7 MWh
Note:Information subject to change without notice.

 

EG4 WallMount Indoor Battery: 10-Year EG4 Manufacturer Warranty

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