BigBattery | Nexus + EG4 6000XP | K0152

NEXUS LiFePO₄ Battery + EG4 6000XP Inverter System

The NEXUS 15kWh LiFePO₄ battery modules pair seamlessly with the EG4 6000XP inverter, delivering a robust and scalable energy storage solution for grid-tied, off-grid, and backup power applications. Each inverter provides 6,000W of split-phase 120/240V output with support for up to 8,000W of solar PV input, making the system well-suited for residential and light commercial installations.

Designed to grow with your needs, systems can scale from a single 15kWh battery up to 225kWh of total storage, while supporting up to 18kW of combined inverter output. Whether used for full off-grid living or grid-connected backup, the NEXUS + EG4 platform delivers dependable, high-efficiency power.

High-Performance Hybrid Inverter Capabilities

The EG4 6000XP inverter features dual MPPT solar inputs, integrated circuit breakers, and a fast UPS transfer time of 15–30 milliseconds, ensuring uninterrupted power delivery during grid outages. With remote monitoring, advanced power management, and transformer-free architecture, the system provides high efficiency in a compact and lightweight form factor.

Additional capabilities include smart load control, AC coupling, and peak shaving, allowing users to reduce energy costs while maintaining reliable backup power and optimal system performance.

Sleek, Compact, and Installer-Friendly Design

The NEXUS battery system features a stackable, space-efficient design, complete with the necessary hardware for a streamlined installation. Engineered for durability in off-grid environments, the system minimizes setup time while delivering consistent, dependable power when it matters most.

Off-Grid Energy Reliability

Each NEXUS module delivers 300Ah of capacity, supporting 140A maximum continuous discharge and 270A peak discharge (1 second) to handle high-demand loads with ease. Advanced thermal management allows charging between 32°F and 113°F and discharging down to -4°F, making NEXUS a true all-weather energy storage solution.

Modular ESS That Grows With You

NEXUS supports parallel expansion of up to 15 battery modules, enabling 225kWh of total capacity per inverter. With integrated RS485, CAN, and RJ45 communication ports, the system is ready to integrate into both new and existing inverter setups—providing full system visibility, automation, and intelligent control.

Legacy Product Parallel Compatibility

The NEXUS battery system is fully compatible and parallel-capable with all KONG and GRIZ products purchased between 2019 and 2024, protecting prior investments while enabling seamless system upgrades.

Battery Specifications – NEXUS 15kWh

• System Voltage: 48V

• Nominal Voltage: 51.2V

• Chemistry: LiFePO₄

• Usable Energy: 15kWh

• Capacity: 300Ah

• Cell Configuration: 16S1P

• Max Continuous Discharge: 140A

• Max Continuous Power: 7.6kW

• Peak Discharge Current: 270A (1s)

• Max Charge Current: 140A

• Charge Voltage Range: 53.5V–57.6V

• Operating Voltage Range: 48V–57.6V

• Max Charge Voltage: 57.9V

• Suggested Low Voltage Cutoff: 50.8V

• Charge Temperature Range: 32°F to 113°F

• Discharge Temperature Range: -4°F to 113°F

• Optimal Discharge Temperature: 59°F to 95°F

• Storage Temperature (SoC >50%):

  • 1 month: -4°F to 113°F

  • 3 months: -4°F to 95°F

  • 6 months: -4°F to 77°F

• Humidity: 10%–95% (non-condensing)

• Weight: ~315 lbs

• Dimensions (WxHxD): 19.7 × 27.5 × 15.7 in (500 × 700 × 400 mm)

• Altitude Limit: <2000m

• Max Parallel Connections: 15 (up to 225kWh)

• Communications: RS485 / RJ45 / CAN

• Protection Rating: IP21

• Installation: Indoor, floor-standing

Inverter Specifications – EG4 6000XP

• AC Voltage: 120V / 240V

• AC Frequency: 50Hz / 60Hz

• Output Power: 6,000W

• Surge Capacity:

  • 12,000W (3.5 sec)

  • 11,000W (5 sec)

• Max Continuous Output Current: 25A @ 240V

• Power Factor: 0.99 (full load)

• Total Harmonic Distortion: <3%

• Switching Time: <15 ms (single) / <30 ms (parallel)

• MPPTs: 2 (1 input per MPPT)

• Max PV Input Power: 8,000W (4,000W per MPPT)

• MPPT Efficiency: 99%

• Battery Voltage Range: 46.4–60V DC

• Max Discharge Current: 140A

• Max Charge Current: 125A

• Operating Temperature: 32°F–113°F

• Noise: <58 dB

• Protection Rating: IP20

• Max Parallel Connections: 16

• Weight: 52.9 lbs

• Dimensions: 18 × 25.5 × 5.25 in