Big Battery | 12kW | 20.4kWh | ETHOS Energy Storage System (ESS)
12kW | 20.4kWh | ETHOS Energy Storage System (ESS)
Smart, Reliable Power for Your Home
The 12kW | 20.4kWh | ETHOS Energy Storage System (ESS) from BigBattery is a powerful and dependable solution for home energy storage. Whether you live off-grid, in a small home, cabin, or just want backup power during outages, this system gives you clean, safe, and reliable energy—day or night.
What Makes the ETHOS ESS Stand Out?
This 48V system is stackable and modular, so you can expand it as your energy needs grow. It’s built for indoor use and comes with an IP65-rated enclosure, which protects it from dust and moisture. Safety is a top priority, with built-in fire suppression and auto cell balancing to keep the battery running smoothly.
The system includes a 15kW Lux hybrid inverter that lets you switch between solar and grid power easily. It also supports up to 18kW of solar panels and includes smart features like UPS backup, peak shaving, and load control to help you save energy and money.
Key Features:
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12kW Output / 20.4kWh Battery Capacity
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Expandable and Stackable Design
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Built-in Fire Safety and Advanced Battery Management System
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Weather-Resistant (IP65 Rated)
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Easy Monitoring with LED Display + CANBus & RS485
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Lux Hybrid Inverter with Touchscreen and 3 MPPTs
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Supports On-Grid and Off-Grid Use
A Complete Home Energy Solution
The 12kW | 20.4kWh | ETHOS Energy Storage System is perfect if you want backup power, more control over your solar energy, or a way to reduce electric bills. It’s also eligible for solar tax credits and utility rebates, making it a smart long-term investment.
What's Included
4 × 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
| SKU: | K0956 |
| GTIN-12 (U.P.C.): | 850061252111 |
| 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 |
| BMS Cutoff Range: | 42 - 47V |
| Cell Configuration: | 16S 2P |
| 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: | 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: | 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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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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