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Big Battery | 6kW 15.3kWh ETHOS Off-Grid Power System

SKU K0709
Save $350.00 Save $350.00
Original price $6,150.00
Original price $6,150.00 - Original price $6,150.00
Original price $6,150.00
Current price $5,800.00
$5,800.00 - $5,800.00
Current price $5,800.00
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REVOLUTIONIZING OFF-GRID POWER! The 6kW 15.3kWh ETHOS Off-Grid Power System from BigBattery is designed to power your tiny home, cabin, or homestead with industry-leading safety, performance, and innovation.

Modular. Scalable. Built to Last.

The ETHOS System features a modular, stackable design for flexible expansion as your energy needs grow. With all hardware included for wall mounting, it installs easily and securely in any off-grid setup. Housed in an IP65-rated enclosure, it includes internal fire suppression and an advanced BMS with auto cell-balancing for enhanced safety and long-lasting reliability.

Smart Monitoring & Control

The ETHOS control box is equipped with a user-friendly LED interface and supports CANBus and RS485 protocols, enabling real-time monitoring and seamless system integration.

Powerhouse Inverter Included

This system is bundled with a powerful 6000W EG4 split-phase inverter-charger featuring a touchscreen LCD, dual MPPTs, and integrated UPS. It supports up to 8000W of PV input and advanced functions like AC coupling, smart load control, and peak shaving—all designed to maximize energy independence and minimize utility costs.

Reliable Energy—On or Off the Grid

Whether you're looking for a dependable backup power source or a full-time off-grid system, the 6kW 15.3kWh ETHOS Off-Grid Power System delivers clean, efficient, and resilient energy. Take control of your power today—available now at Solar Guys Pro.


 

What's Included

3 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box
1 × EG4 6kW (8kPV) OFF-GRID INVERTER
1 × 10kWh Ethos Controller to Battery Power Cable 31.5" inch (800mm)

Specs and Downloads

Single Stack Tech Specs

System Voltage: 48V
Nominal Voltage: 51.2V
Chemistry: LiFePO4
kWh Capacity: 10.24kWh
Ah Capacity: 200Ah
Charging Voltage Range: 55.6 - 57V
Max Charge Voltage: 57V
Operating Voltage Range: 48 – 57V
Suggested Low Voltage Cutoff: 48 – 50.8V
Cell Configuration: 16S 2P
Max Continuous Discharge Current: 200A
Max Continuous Power: 10240W
Max Discharge Peak Current: 300A (Max 5 seconds)
Max Charge Current: 200A
Charge Temperature Range: 32°F - 113°F (0°C - 45°C)
Discharge Temperature Range: -4°F - 140°F (-20°C - 60°C)
Optimal Discharge Temperature Range: 59°F - 95°F (15°C - 35°C)
Storage Temperature Range (SoC >50%): -4°F - 113°F (-20°C - 45°C) (Max 6 months)
Weight: 273 lb (123.8 kg)
Depth: 6.7 in (170 mm)
Width: 26.5 in (674 mm)
Height: 43.3 in (1100 mm)
Max Connections: Up to (16) parallel connections per control box
Protection Rating: IP65 / NEMA 4X
Communications: CANBus / RS485
Certifications: UL9540A, UL1973, & UN38.3

Inverter Specs

AC INPUT & OUTPUT

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)

PV INPUT

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%

BATTERY

Nominal Voltage: 48V DC
Battery Voltage Range: 46.4 - 60V DC
Max. Discharge Current: 140A
Max. Charge Current: 125A
DC Cut-Off Voltage: 59V DC
DC Recovery Voltage: 57.4V DC
Charge Cut-Off Voltage: 58.4V DC

OPERATING ENVIRONMENT & DIMENSIONS

Operating Temperature: 32ºF - 113ºF (0ºC - 45ºC)
Storage Temperature: 5ºF - 140ºF (-15ºC - 60ºC)
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)


Battery Downloads

Inverter Downloads

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