Nexus + EG4 6000XP
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Product Summary:

The BigBattery NEXUS™ ESS combines high-capacity 15kWh LiFePO₄ battery modules with the EG4 6000XP hybrid inverter to deliver a powerful, scalable energy solution for both on-grid and off-grid applications. Designed for flexibility and performance, this system provides 6,000W split-phase output per inverter with up to 8,000W PV input, making it ideal for home backup, energy savings, and full off-grid operation.

 

Expandable from 15kWh up to 225kWh and scalable up to 18kW output, NEXUS grows with your energy needs while maintaining reliable, efficient performance. With advanced battery technology, fast UPS switching (15-30ms), and intelligent energy management, this system ensures seamless power during outages and optimized daily usage.

 

Built with safe LiFePO₄ chemistry, integrated system protection, and U.S.-supported engineering, NEXUS delivers a dependable, maintenance-free energy storage solution.

Ships From: Texas, USA
Warranty: 12 Years (Battery), 10 Years (Inverter)
Support: Lifetime USA-Based Tech Support

 

Compatibility

Integrated System:

  • NEXUS Battery Modules + EG4 6000XP Hybrid Inverter

Expandable System Design:

  • Scales from 15kWh to 225kWh
  • Supports multiple inverters up to 18kW output
  • Compatible with off-grid installations

Key Features

  • 15kWh LiFePO₄ Battery Modules – Safe, high-capacity lithium storage with long lifespan
  • 6,000W Output per Inverter – Reliable split-phase power for residential applications
  • 8,000W PV Input – Efficient solar harvesting with dual MPPT inputs
  • 6,000+ Cycle Life – Built for long-term performance and daily energy use
  • Advanced BMS Protection – Full protection against voltage, current, and temperature risks
  • UPS Backup (15-30ms) – Seamless transition during grid outages
  • Modular Expansion – Easily scale storage and output as energy demands grow
  • Smart Energy Management – Supports load control, AC coupling, and peak shaving
  • Built-In Breakers & Safety – Simplifies installation and enhances protection
  • Remote Monitoring – Track system performance and manage settings from anywhere
  • Maintenance-Free Operation – No routine servicing required

A scalable, high-performance energy storage system built for reliability, flexibility, and energy independence-with the support and performance you can trust.

Nexus + EG4 6000XP

$4,670.00
SKU# K0152

Battery Selected

1× BigBattery NEXUS

Total Capacity

15 kWh

Inverter Selected

1× EG4 6000XP

Input / Output

8 kW / 6 kW

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 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 None

Choose Your ESS Configuration*

SKU: K0152-V Category:
Free Shipping on orders $5000+

Introducing the Nexus

Sleek & Compact Design

Our stackable, compact design comes with all the hardware you need for a straightforward setup, letting you get your off-grid system up and running efficiently in less time. Engineered for reliability in any off-grid environment, it delivers consistent power when you need it most.

Off-Grid Energy Reliability

With 300Ah of capacity, 140A max continuous discharge, and peak support up to 270A, NEXUS handles high-demand loads with ease. NEXUS’s smart thermal management enables charging from 32 °F to 113 °F and discharging down to -4 °F, making it a true all-weather energy solution.

Modular ESS That Grows With You

NEXUS supports parallel expansion up to 15 units, offering 225kWh total capacity per inverter. With RS485, CAN, and RJ45 communication ports, it’s ready to integrate seamlessly into new or existing inverter systems—ensuring full system transparency, automation, and control.

Legacy Product Parallel Compatibility

The NEXUS is compatible and parallel-able with all existing KONG and GRIZ products purchased between 2019-2024.


 

Battery Downloads

SKU#:K0154, K0155, K0156, K0160, K0161, K0162, K0163
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD

Battery Specifications

Battery Specifications:NEXUS 15KWh
System Voltage:48V
Nominal Voltage:51.2V
Chemistry:LiFePO4
Usable Energy (kWh):15kWh
Ah Capacity:300Ah
Cell Configuration:16S1P
Max Continuous Discharge:140A
Max Discharge 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 Cutoff50.8V
Charge Temp Range:32°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 225kWh)
Communications:RS485 / RJ45 / CAN
Protection Rating:IP21
Installation:Indoor Floor-standing

Inverter Downloads

SKU#:K0152, K0153, K0157, K0158, K0159
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
Monitoring System Guide:DownloadDOWNLOAD
Monitoring Adapter Installation Guide:DownloadDOWNLOAD
UL1741 Certificate:DownloadDOWNLOAD
Warranty:DownloadDOWNLOAD
CEC Listing – EG4 6000XP:Go to linkGO TO LINK

Inverter Specifications

AC Voltage:120V AC / 240V AC
AC Frequency:50 Hz / 60 Hz
Max. Continuous AC Current:37.5A @ 240V
Max. AC Input Power:9000W
AC Bypass:50A
Output Voltage:120V AC / 240V AC
Output Frequency:50 Hz / 60 Hz
Max. Continuous Output Current:25A @ 240V
Output Power:6000W
Surge Capacity:12000W (3.5 sec) / 11000W (5 sec)
Power Factor:0.99 (Full Load)
Reactive Power Adjustment Range:-0.8 – 0.8 Leading Adjustable
Total Harmonic Distortion:<3%
Switching Time:<15 ms (Single) / <30 ms (Parallel)
No. of MPPTs (Inputs per MPPT):2 (1)
Max. Input Current:17A / 17A
Max. Short Circuit Input Current:25A / 25A
DC Input Voltage Range:100 – 480V DC
Start Up Voltage:100V DC ± 10V DC
MPPT Operating Voltage Range:120 – 385V DC
MPPT Voltage:320V DC
Max. PV Array Power:8000W (4000W per MPPT)
MPPT Efficiency:99%
Nominal Battery Voltage:48V DC
Battery Voltage Range:46.4 – 60V DC
Max. Discharge Current:140A
Max. Charge Current:125A
DC Cut-Off Voltage:59V DC
Operating Temperature:32°F – 113°F (0°C – 45°C)
Storage Temperature:5°F – 140°F (-15°C – 60°C)
Altitude:<6,561 ft (2000 m)
Relative Humidity:5 – 95%
Typical Noise Emission:<58 dB
Protection Rating:IP20
Max. Parallel Connections:16
Weight:52.9 lbs (24 kg)
Depth:5.25 in (132 mm)
Width:18 in (457 mm)
Height:25.5 in (648 mm)

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

Introducing the Nexus

Sleek & Compact Design

Our stackable, compact design comes with all the hardware you need for a straightforward setup, letting you get your off-grid system up and running efficiently in less time. Engineered for reliability in any off-grid environment, it delivers consistent power when you need it most.

Off-Grid Energy Reliability

With 300Ah of capacity, 140A max continuous discharge, and peak support up to 270A, NEXUS handles high-demand loads with ease. NEXUS’s smart thermal management enables charging from 32 °F to 113 °F and discharging down to -4 °F, making it a true all-weather energy solution.

Modular ESS That Grows With You

NEXUS supports parallel expansion up to 15 units, offering 225kWh total capacity per inverter. With RS485, CAN, and RJ45 communication ports, it’s ready to integrate seamlessly into new or existing inverter systems—ensuring full system transparency, automation, and control.

Legacy Product Parallel Compatibility

The NEXUS is compatible and parallel-able with all existing KONG and GRIZ products purchased between 2019-2024.


 

Battery Downloads

SKU#:K0154, K0155, K0156, K0160, K0161, K0162, K0163
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD

Battery Specifications

Battery Specifications:NEXUS 15KWh
System Voltage:48V
Nominal Voltage:51.2V
Chemistry:LiFePO4
Usable Energy (kWh):15kWh
Ah Capacity:300Ah
Cell Configuration:16S1P
Max Continuous Discharge:140A
Max Discharge 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 Cutoff50.8V
Charge Temp Range:32°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 225kWh)
Communications:RS485 / RJ45 / CAN
Protection Rating:IP21
Installation:Indoor Floor-standing

Inverter Downloads

SKU#:K0152, K0153, K0157, K0158, K0159
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
Monitoring System Guide:DownloadDOWNLOAD
Monitoring Adapter Installation Guide:DownloadDOWNLOAD
UL1741 Certificate:DownloadDOWNLOAD
Warranty:DownloadDOWNLOAD
CEC Listing – EG4 6000XP:Go to linkGO TO LINK

Inverter Specifications

AC Voltage:120V AC / 240V AC
AC Frequency:50 Hz / 60 Hz
Max. Continuous AC Current:37.5A @ 240V
Max. AC Input Power:9000W
AC Bypass:50A
Output Voltage:120V AC / 240V AC
Output Frequency:50 Hz / 60 Hz
Max. Continuous Output Current:25A @ 240V
Output Power:6000W
Surge Capacity:12000W (3.5 sec) / 11000W (5 sec)
Power Factor:0.99 (Full Load)
Reactive Power Adjustment Range:-0.8 – 0.8 Leading Adjustable
Total Harmonic Distortion:<3%
Switching Time:<15 ms (Single) / <30 ms (Parallel)
No. of MPPTs (Inputs per MPPT):2 (1)
Max. Input Current:17A / 17A
Max. Short Circuit Input Current:25A / 25A
DC Input Voltage Range:100 – 480V DC
Start Up Voltage:100V DC ± 10V DC
MPPT Operating Voltage Range:120 – 385V DC
MPPT Voltage:320V DC
Max. PV Array Power:8000W (4000W per MPPT)
MPPT Efficiency:99%
Nominal Battery Voltage:48V DC
Battery Voltage Range:46.4 – 60V DC
Max. Discharge Current:140A
Max. Charge Current:125A
DC Cut-Off Voltage:59V DC
Operating Temperature:32°F – 113°F (0°C – 45°C)
Storage Temperature:5°F – 140°F (-15°C – 60°C)
Altitude:<6,561 ft (2000 m)
Relative Humidity:5 – 95%
Typical Noise Emission:<58 dB
Protection Rating:IP20
Max. Parallel Connections:16
Weight:52.9 lbs (24 kg)
Depth:5.25 in (132 mm)
Width:18 in (457 mm)
Height:25.5 in (648 mm)

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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