Big Battery | 6x Nexus + 3x EG4 1200XP
BigBattery | 6× NEXUS 48V LiFePO4 Batteries + 2× EG4 12000XP Inverters
The BigBattery 6× NEXUS + 2× EG4 12000XP system delivers an unmatched combination of energy storage, power output, and long-term reliability. With a total of 85.8kWh of LiFePO4 storage and dual 12kW hybrid inverters, this high-performance setup is engineered for full-home backup, solar integration, or large-scale off-grid systems. Built with premium lithium technology and intelligent inverter controls, it ensures stable, efficient, and scalable power for any energy application.
KEY FEATURES
- Massive 85.8kWh storage capacity – Six 48V 14.3kWh NEXUS LiFePO4 batteries provide outstanding energy reserves.
- Dual EG4 12000XP inverters – Deliver 24kW continuous power with seamless split-phase 120/240V output.
- Advanced lithium technology – LiFePO4 cells ensure safety, high performance, and over 4000+ life cycles.
- Whole-home backup capability – Power heavy appliances, HVAC systems, and essential home circuits with ease.
- Solar and grid-ready integration – Compatible with solar arrays and hybrid systems for flexible energy management.
- Smart inverter monitoring – Wi-Fi and app connectivity provide real-time tracking and system control.
- High efficiency and clean output – Pure sine wave power ensures smooth operation for sensitive electronics.
- Scalable and future-ready design – Expandable with additional batteries or inverters to meet growing power needs.
- Durable and reliable build – Designed for long-term, maintenance-free operation in demanding conditions.
Specifications
AC INPUT
| 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 |
AC OUTPUT
| 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) |
PV INPUT
| 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) |
| Max. 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 |
BATTERY
| 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 |
OPERATING ENVIRONMENT
| 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 (Non-Condensing): | 5 – 95% |
| Typical Noise Emission: | <60 dB |
| Cooling Method: | Fan |
DIMENSIONS
| 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) |
Manual & Downloads
Are Solar Guys Pro Authorized Retailers?
Yes! We are proud to be one of the few online retailers who are authorized retailers for every single product we carry!
Being an authorized retailer means we carry the same warranty as the manufacturer, protecting your purchase!
When Will My Order Ship?
Most orders ship within 1–3 business days. You’ll get a tracking number as soon as it ships via email!
Do We Accept Returns?
Yes absolutely, we have a no-hassle, 30-day return policy on all items! To refer to the full policy, click HERE
Are Products Brand New?
Yes! By default, all products on Solar Guys Pro are 100% brand-new and in perfect condition.
If an item is used or refurbished, it will clearly indicate so in the title of the product as well as the discription.
For example, a used Battery will say:
XYZ Battery | 48V 100AH (REFURBISHED)
If you'd like to confirm, you can always send us a email at info@solarguyspro.com
Orders over $500 include a FREE (Normally $149.99) 80-Page DIY Solar eBook — added automatically at checkout.
Frequently Asked Questions
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