Big Battery | 6x Nexus + 2x EG4 1200XP
BigBattery | 6× NEXUS 48V LiFePO4 Batteries + 2× EG4 12000XP Inverters
Take your energy independence to the next level with the BigBattery 6× NEXUS + 2× EG4 12000XP system. Designed for large-scale residential, commercial, and off-grid power applications, this powerhouse setup delivers unmatched capacity, performance, and reliability. With a total of 85.8kWh of LiFePO4 storage and dual 12kW hybrid inverters, it ensures uninterrupted, efficient, and sustainable power for your entire energy system.
KEY FEATURES
- Massive 85.8kWh energy capacity – Six 48V 14.3kWh NEXUS LiFePO4 batteries deliver robust, long-lasting storage.
- Dual 12kW hybrid inverters – Two EG4 12000XP units provide a total of 24kW continuous output power.
- Advanced LiFePO4 chemistry – Offers exceptional safety, thermal stability, and over 4000+ deep cycles.
- Whole-home and business backup – Powers heavy appliances, HVAC systems, and critical loads with ease.
- Solar-ready performance – Integrates seamlessly with solar arrays for complete off-grid functionality.
- Smart control and monitoring – Built-in Wi-Fi, RS485, and app connectivity for remote system management.
- Pure sine wave output – Ensures clean, stable power for sensitive electronics and devices.
- High efficiency operation – Engineered for consistent, reliable performance with minimal energy loss.
- Expandable and scalable – Add more batteries or inverters to meet future energy demands.
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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