Big Battery 12kW | 30.7kWh | ETHOS Energy Storage System (ESS) — Solar Guys Pro
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Big Battery | 12kW | 30.7kWh | ETHOS Energy Storage System (ESS)

SKU K0957
Save $4,390.00 Save $4,390.00
Original price $17,390.00
Original price $17,390.00 - Original price $17,390.00
Original price $17,390.00
Current price $13,000.00
$13,000.00 - $13,000.00
Current price $13,000.00
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12kW | 30.7kWh | ETHOS Energy Storage System (ESS)
Premium Indoor Power Storage for Homes, Cabins & Tiny Living

BigBattery's 48V ETHOS Energy Storage System delivers a robust 30.7kWh indoor solution, perfectly tailored for grid-tied residential setups, including tiny homes, cabins, and family residences. With reliable performance, intelligent energy management, and industry-leading safety features, the ETHOS is engineered to power your lifestyle while maximizing energy savings.

Built for Flexibility & Growth

The ETHOS system is designed with a stackable, modular format that grows with your energy needs. It comes pre-equipped with everything you need for a smooth installation—no guesswork required.

  • Indoor-Optimized Configuration: Clean, compact, and designed for interior spaces

  • Expandable Design: Scale up as your energy demands increase

  • Easy Installation: Includes all mounting and integration hardware

  • Durable Protection: IP65-rated enclosure shields against dust and water intrusion

  • Internal Fire Suppression: Safety you can trust in residential environments

Intelligent Monitoring & Control

An intuitive LED control panel and integrated CANBus + RS485 protocols offer real-time diagnostics and performance visibility.

  • Smart Monitoring: LED interface provides system status at a glance

  • Advanced Battery Management System (BMS): Auto cell-balancing ensures optimal battery life and performance

  • Reliable Safety Mechanisms: Continuous monitoring helps prevent faults or imbalance

Paired with a Powerful 12000W Lux Inverter

To complete the system, the ETHOS is paired with a high-efficiency 12kW Lux inverter, delivering the power and smart control capabilities needed for hybrid grid and off-grid setups.

  • Three MPPT Inputs: Maximize PV input from multiple solar arrays

  • 18000W PV Array Support: Handles large-scale solar production

  • Integrated UPS Module: Seamless transitions between grid and backup power

  • LCD Touchscreen Display: Simplified control and configuration

  • Smart Load Control, AC Coupling, & Peak Shaving: Optimize usage, reduce utility costs, and maintain system stability

Key Features Summary:

  • 30.7kWh Indoor Battery Storage – Ideal for homes with medium to high power needs

  • 12kW Output via Lux Inverter – Efficient power for whole-home loads

  • Expandable & Modular – Adaptable for future energy upgrades

  • Advanced Safety – IP65 protection, auto-balancing BMS, fire suppression

  • Real-Time System Monitoring – Built-in LED control and advanced communications

  • High Solar Input Capacity – Supports up to 18,000W of PV panels

  • Seamless On/Off-Grid Switching – Integrated UPS ensures uninterrupted power supply

Get Reliable, Scalable Power with the 48V ETHOS Indoor ESS

The 12kW | 30.7kWh ETHOS Energy Storage System (ESS) is a smart investment for homeowners seeking dependable, scalable, and safe indoor energy storage. Whether you're preparing for emergencies, optimizing solar usage, or qualifying for net metering and solar incentives, the ETHOS delivers.

Take control of your home’s energy and reduce your reliance on the grid with ETHOS—built for today, ready for tomorrow.


What's Included

6 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box
1 × ETHOS RACK BASE
1 × LUXPower 12kW Hybrid Inverter
2 × Ethos Parallel Power Cable 4.9 ft (1500mm)
1 × Ethos Parallel Comm Cable 4.9 ft (150cm)

Specs and Downloads

Spec Sheet

Inverter Spec Sheet

SKU: K0957
GTIN-12 (U.P.C.): 850061252128
System Voltage: 48V
Nominal Voltage: 51.2V
Chemistry: LiFePO4
kWh Capacity: 15.36kWh
Ah Capacity: 300Ah
Charging Voltage Range: 55.6 - 57V
Max Charge Voltage: 57V
Operating Voltage Range: 48 – 57V
Suggested Low Voltage Cutoff: 48 – 50.8V
BMS Cutoff Range: 42 - 47V
Cell Configuration: 16S 3P
Max Continuous Discharge Current: 250A
Max Continuous Power: 12800W
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: 387 lb (175.5 kg)
Depth: 6.7 in (170 mm)
Width: 26.5 in (674 mm)
Height: 59.8 in (1520 mm)
Max Connections: Up to (16) parallel connections per control box
Protection Rating: IP65 / NEMA 4X
Communications: CANBus / RS485
Certifications: UL9540, UL9540A, UL1973, & UN38.3


User Manual
UL9540 Certification
UL1973 Certification
Safety Data Sheet

Inverter

User Manual
Rapid ShutDown Certificate
UL1741 Certificate
IEEE1547 Certificate

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