Big Battery | 12kW | 15.3kWh | ETHOS Energy Storage System (ESS)
12kW | 15.3kWh | ETHOS Energy Storage System (ESS)
Reliable, Expandable Home Energy Storage for Grid-Tied and Off-Grid Living
The 12kW | 15.3kWh | ETHOS Energy Storage System (ESS) from BigBattery is a powerful and compact indoor solution for storing clean energy in your home, cabin, or small residence. Whether you're living off-grid or want to save money with grid-tied solar, the ETHOS ESS delivers safe, efficient, and scalable power—day or night.
Simple, Smart, and Safe
Designed with flexibility in mind, the ETHOS system features a stackable and modular build, so you can expand your storage as your energy needs grow. It’s easy to install and comes fully equipped with hardware for quick setup.
Safety and performance go hand-in-hand. This 48V system includes:
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An IP65-rated enclosure for protection against dust and water
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An advanced Battery Management System (BMS) with auto cell-balancing
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Internal fire suppression for maximum safety
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Real-time system monitoring via an LED control box with CANBus and RS485 communications
Includes the Powerful 12kW Lux Inverter
Each ETHOS system comes paired with a 12000W Lux hybrid inverter, featuring:
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LCD touchscreen interface
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3 MPPT charge controllers
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Integrated UPS module for seamless backup power
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Support for up to 18,000W of solar input
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Smart features like load control, AC coupling, and peak shaving to help you save energy and money
Key Features:
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15.3kWh Battery Capacity / 12kW Inverter Output
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Modular & Stackable Design for easy system expansion
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IP65 Enclosure for indoor use with weather resistance
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Advanced BMS with fire suppression and auto cell balancing
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Real-Time Monitoring through LED display, CANBus & RS485
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Supports 18kW of PV Solar with smart load management
A Complete Energy Storage System You Can Trust
Whether you need backup power for emergencies, want to make the most of your solar setup, or lower your electricity bills with net metering, the 12kW | 15.3kWh | ETHOS Energy Storage System (ESS) is a smart investment in reliable home energy.
What's Included
3 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box
1 × LUXPower 12kW Hybrid Inverter
1 × 15kWh Ethos Controller to Battery Power Cable 4ft (1220mm)
Specs and Downloads
| SKU: | K0955 |
| GTIN-12 (U.P.C.): | 850061252098 |
| 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
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!
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! All products on Solar Guys Pro are 100% brand-new and in perfect condition.
We do not sell any used or refurbished items.
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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