BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System
Nexus 2 16kWh Battery 12 Year Warranty, 8000+ Deep Cycles
NEXUS 2 Smart BMS protections, thermal protection and suppression system.
NEXUS 2 secure mobility, LED meter, easy access connections and terminal ports.
BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System - Image 5
BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System - Image 6
BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System - Image 7
BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System - Image 8
BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System - Image 9

Everything You Need, Included

Everything in the box

BigBattery 51.2V NEXUS 2 LiFePO4 Battery1× BigBattery 51.2V NEXUS 2 LiFePO4 Battery
EG4 12000XP V2 OFF-GRID INVERTER1× EG4 12000XP V2 OFF-GRID INVERTER
2AWG (Black and Red) 3FT Ring to Ring Terminal Cable1× 2AWG (Black and Red) 3FT Ring to Ring Terminal Cable
  • U.S. Support
  • LiFePO₄ Safety

BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System

SKU# K0326

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SKU: K0326-V Categories: ,
$5,154.99
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Documents & Certifications

Battery

Inverter

About this item

The BigBattery NEXUS 2 Battery + EG4 12000XP ESS System delivers high-capacity energy storage, powerful split-phase output, and scalable off-grid energy independence. Combining the 16kWh NEXUS 2 LiFePO₄ battery with the EG4 12000XP off-grid inverter, this system provides a flexible foundation for powering homes, cabins, workshops, and backup applications.

The EG4 12000XP delivers up to 12,000W of continuous 120/240V split-phase output with 15,360W of surge capacity for approximately 10 seconds. Its two high-voltage MPPTs can utilize up to 24,000W of solar power, providing substantial charging capacity for large solar arrays and expandable battery banks.

Paired with the NEXUS 2—featuring 16kWh of LiFePO₄ storage, 314Ah capacity, 150A continuous discharge, and up to 7.6kW of continuous battery power—the system provides dependable energy for household essentials, appliances, pumps, tools, and other off-grid loads. Its 270A one-second peak discharge rating supplies additional current for short equipment-startup demands.

The NEXUS 2 features an integrated BMS with multiple safety redundancies, RS485 and CAN communication interfaces, and a rugged IP54-rated floor-standing enclosure suitable for indoor or outdoor battery installation. Its advanced LiFePO₄ cells are rated for more than 8,000 cycles, providing over 12 years of service when cycled daily under appropriate operating conditions.

The 12000XP can operate entirely off-grid or use grid and generator input for supplemental charging and load support. Its smart-load connection supports configurable load shedding, AC coupling, or power management for selected appliances. Plug-in Wi-Fi connectivity enables remote monitoring and adjustments through the EG4 app and EG4 Monitor Center.

Ships From: Texas, USA
Warranty: 12 Years (Battery), 5 Years (Inverter)
Support: Lifetime USA-Based Tech Support

Compatibility

Integrated & Optimized System:

  • BigBattery NEXUS 2 48V LiFePO₄ Battery + EG4 12000XP Off-Grid Inverter
  • RS485 and CAN interfaces for communication-ready integration
  • Compatible with supported closed-loop battery communication profiles
  • One NEXUS 2 supports up to 7.6kW of continuous battery-powered output
  • Two NEXUS 2 batteries are recommended to support the inverter’s full 12kW output

Expandable & Flexible:

  • Expand the NEXUS 2 battery bank up to 15 batteries in parallel
  • Maximum battery configuration rated at up to 240kWh
  • Parallel up to 16 EG4 12000XP inverters for larger installations
  • Supports solar, battery, grid-assisted, and generator-assisted operation
  • Supports smart-load management and AC coupling
  • Suitable for homes, cabins, workshops, and high-demand off-grid systems
Key Features
  • Complete Off-Grid ESS SolutionHigh-capacity battery and inverter system designed for scalable energy independence
  • 12,000W Continuous OutputPowerful 120/240V split-phase output for residential and demanding off-grid loads
  • 15,360W Surge CapacitySupports short-duration startup demands for approximately 10 seconds
  • 24,000W Utilized PV InputHigh solar capacity for powering loads and rapidly charging the battery bank
  • Up to 28,000W Recommended Solar InputSupports oversized solar arrays for improved production conditions
  • Dual High-Voltage MPPTsProvides flexible solar-array configuration across four PV inputs
  • 100–480VDC Solar Input RangeEnables efficient array design with reduced DC cable requirements
  • 16kWh LiFePO₄ BatteryHigh-capacity energy storage with a 314Ah rating
  • 7.6kW Continuous Battery PowerReliable output from each NEXUS 2 battery
  • 150A Continuous DischargeSupports demanding household and off-grid equipment
  • 270A Peak DischargeProvides one-second startup support for short surge loads
  • 8,000+ Battery CyclesEngineered to provide more than 12 years of daily cycling
  • Integrated Battery Management SystemMultiple safety redundancies protect the cells and connected equipment
  • Fast Transfer TimeLess than 10ms with a single inverter to help maintain power during an AC-source interruption
  • 100A Grid BypassSupports substantial grid-assisted load capacity
  • Generator IntegrationCompatible with recommended generators from 6,000W to 15,000W
  • Smart-Load ManagementSupports load shedding, AC coupling, and configurable appliance control
  • Remote Wi-Fi MonitoringMonitor and adjust the inverter through EG4 software
  • Expandable Battery StorageConnect up to 15 NEXUS 2 batteries in parallel
  • Expandable Inverter OutputParallel up to 16 EG4 12000XP inverters
  • Indoor/Outdoor Battery InstallationRugged IP54-rated, floor-standing battery enclosure
  • Maintenance-Free OperationLong-lasting LiFePO₄ chemistry without routine servicing

A high-powered and expandable off-grid energy system engineered for substantial solar production, long-duration battery storage, dependable backup power, and lasting energy independence.

Battery Downloads

SKU#:F-NXUS2-48161-G1
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD

Battery Specifications

Battery Specifications:NEXUS 2 16 KWh
GTIN/UPC:00199874694771
System Voltage:48V
Nominal Voltage:51.2V
Chemistry:LiFePO4
Usable Energy (kWh):16.08kWh
Ah Capacity:314Ah
Cell Configuration:16S1P
Max Continuous Discharge Current:150A
Max Continuous Power:7.6kW
Max Discharge Peak Current:270A(1s)
Max Charge Current:140A
Charging Voltage Range:53.5V-57.6V
Operating Voltage Range:48V-57.6V
Max Charge Voltage:57.9V
Suggested Low Voltage Cutoff:50.8V
Charge Temp Range*:-4°F to 113°F
Discharge Temp Range:-4°F to 113°F
Optimal Discharge Temp:59°F to 95°F
Storage Temp Range (SoC >50%):(1 month:-4°F ~ 113°F | 3 months: -4°F ~ 95°F | 6 months: -4°F ~ 77°F)
Humidity Range:10%-95% (No Condensation)
Weight (lbs):~315 lbs
Dimensions (WxHxD):19.7 x 27.5 x 15.7 in (500×700×400 mm)
Altitude Limit:<2000m
Max Connections:15 in parallel (up to 240kWh)
Communications:RS485 / RJ45 / CAN
Protection Rating:IP54
Installation:Indoor Floor-standing

*The battery will start charging at at 32°F after the heating element has taken effect.

Inverter Downloads

SKU: INV030
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
UL1741 Certificate:DownloadDOWNLOAD
WiFi Configuration Guide:DownloadDOWNLOAD
CEC Listing – EG4 12000XP:Go to linkGO TO LINK

Inverter Specifications

Nominal AC Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Frequency (Grid | Generator):60 Hz (Default) | 50 Hz (Configurable)
Max Continuous AC Current (Grid | Generator):100A @ 240VAC | 62.5A @ 240VAC
Max AC Input Power:24000W
AC Bypass (Grid | Generator):100A | 90A
Recommended Generator Capacity:6000W – 15000W
Output Voltage:120/240VAC | 208VAC
Output Frequency:60 Hz (Default) | 50 Hz (Configurable)
Max Continuous Output Current:50A @ 240VAC | 57.7A @ 208VAC
Nominal Output Power (without PV):12000W @ 240V | 12000W @ 208V
Nominal Output Power (with PV):12000W @ 240V | 12000W @ 208V
Max Continuous Wattage:12000W (L1/L2) | 6000W (L1-N/L2-N)
Surge Capacity:18000W (5 sec) | 15000W (10 sec)
Power Factor:0.99
Total Harmonic Distortion:<3%
Switching Time:<10 ms (Single) | <20 ms (Parallel)
No. of MPPTs (Inputs per MPPT):2 (2)
Max Input Current:35A / 35A
Max Short Circuit Input Current:44A / 44A
DC Input Voltage Range:100 – 480VDC
Min Start Up Voltage:100VDC
MPPT Operating Voltage Range:120 – 385VDC
Nominal MPPT Voltage:320VDC
Max Utilized PV Power:24000W (12000W per MPPT)
Max Recommended PV Input:28000W (14000W per MPPT)
Efficiency:99% (MPPT) | 93.5% (PV to Loads) | 92.8% (PV to Battery) | 92.5% (AC to Battery) | 90.2% (Battery to Loads)
Idle Consumption (Standby Mode):<70W
Nominal Voltage:48VDC
Battery Voltage Range:46.4 – 60VDC
Max Charge / Discharge Current:250A
Max Charge / Discharge Power:12000W
DC Cut-Off Voltage:59VDC
Recommended Battery Capacity per Inverter:>400Ah
Max Parallel Connections:6
Protection Rating:IP20
Communication Interface:RS485 / CANBus / WiFi
Operating Temperature (Full Load):32ºF – 113ºF (0ºC – 45ºC)
Storage Temperature:5ºF – 140ºF (-15ºC – 60ºC)
Altitude:<6,561 ft (2000 m)
Relative Humidity:5 – 95% (Non-Condensing)
Typical Noise Emission:<60 dB
Cooling Method:Fan
Weight:104.7 lbs (47.5 kg)
Depth:5.9 in (150 mm)
Width:20.9 in (530 mm)
Height:34.25 in (870 mm)

Battery Downloads

SKU#:F-NXUS2-48161-G1
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD

Battery Specifications

Battery Specifications:NEXUS 2 16 KWh
GTIN/UPC:00199874694771
System Voltage:48V
Nominal Voltage:51.2V
Chemistry:LiFePO4
Usable Energy (kWh):16.08kWh
Ah Capacity:314Ah
Cell Configuration:16S1P
Max Continuous Discharge Current:150A
Max Continuous Power:7.6kW
Max Discharge Peak Current:270A(1s)
Max Charge Current:140A
Charging Voltage Range:53.5V-57.6V
Operating Voltage Range:48V-57.6V
Max Charge Voltage:57.9V
Suggested Low Voltage Cutoff:50.8V
Charge Temp Range*:-4°F to 113°F
Discharge Temp Range:-4°F to 113°F
Optimal Discharge Temp:59°F to 95°F
Storage Temp Range (SoC >50%):(1 month:-4°F ~ 113°F | 3 months: -4°F ~ 95°F | 6 months: -4°F ~ 77°F)
Humidity Range:10%-95% (No Condensation)
Weight (lbs):~315 lbs
Dimensions (WxHxD):19.7 x 27.5 x 15.7 in (500×700×400 mm)
Altitude Limit:<2000m
Max Connections:15 in parallel (up to 240kWh)
Communications:RS485 / RJ45 / CAN
Protection Rating:IP54
Installation:Indoor Floor-standing

*The battery will start charging at at 32°F after the heating element has taken effect.

Inverter Downloads

SKU: INV030
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
UL1741 Certificate:DownloadDOWNLOAD
WiFi Configuration Guide:DownloadDOWNLOAD
CEC Listing – EG4 12000XP:Go to linkGO TO LINK

Inverter Specifications

Nominal AC Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Frequency (Grid | Generator):60 Hz (Default) | 50 Hz (Configurable)
Max Continuous AC Current (Grid | Generator):100A @ 240VAC | 62.5A @ 240VAC
Max AC Input Power:24000W
AC Bypass (Grid | Generator):100A | 90A
Recommended Generator Capacity:6000W – 15000W
Output Voltage:120/240VAC | 208VAC
Output Frequency:60 Hz (Default) | 50 Hz (Configurable)
Max Continuous Output Current:50A @ 240VAC | 57.7A @ 208VAC
Nominal Output Power (without PV):12000W @ 240V | 12000W @ 208V
Nominal Output Power (with PV):12000W @ 240V | 12000W @ 208V
Max Continuous Wattage:12000W (L1/L2) | 6000W (L1-N/L2-N)
Surge Capacity:18000W (5 sec) | 15000W (10 sec)
Power Factor:0.99
Total Harmonic Distortion:<3%
Switching Time:<10 ms (Single) | <20 ms (Parallel)
No. of MPPTs (Inputs per MPPT):2 (2)
Max Input Current:35A / 35A
Max Short Circuit Input Current:44A / 44A
DC Input Voltage Range:100 – 480VDC
Min Start Up Voltage:100VDC
MPPT Operating Voltage Range:120 – 385VDC
Nominal MPPT Voltage:320VDC
Max Utilized PV Power:24000W (12000W per MPPT)
Max Recommended PV Input:28000W (14000W per MPPT)
Efficiency:99% (MPPT) | 93.5% (PV to Loads) | 92.8% (PV to Battery) | 92.5% (AC to Battery) | 90.2% (Battery to Loads)
Idle Consumption (Standby Mode):<70W
Nominal Voltage:48VDC
Battery Voltage Range:46.4 – 60VDC
Max Charge / Discharge Current:250A
Max Charge / Discharge Power:12000W
DC Cut-Off Voltage:59VDC
Recommended Battery Capacity per Inverter:>400Ah
Max Parallel Connections:6
Protection Rating:IP20
Communication Interface:RS485 / CANBus / WiFi
Operating Temperature (Full Load):32ºF – 113ºF (0ºC – 45ºC)
Storage Temperature:5ºF – 140ºF (-15ºC – 60ºC)
Altitude:<6,561 ft (2000 m)
Relative Humidity:5 – 95% (Non-Condensing)
Typical Noise Emission:<60 dB
Cooling Method:Fan
Weight:104.7 lbs (47.5 kg)
Depth:5.9 in (150 mm)
Width:20.9 in (530 mm)
Height:34.25 in (870 mm)
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BigBattery NEXUS 2 Battery + EG4 12000XP Inverter | 16kWh |Off-Grid ESS System

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