Big Battery | 12kW 40.9kWh ETHOS Energy Storage System (ESS)
12kW 40.9kWh ETHOS Energy Storage System (ESS)
Next-Level Home Power Storage Starts Here — The 12kW 40.9kWh ETHOS Energy Storage System (ESS) by BigBattery delivers powerful, scalable, and smart energy storage tailored for modern residential needs. Whether you're backing up your home during outages or maximizing solar production, this system ensures reliable energy 24/7.
Engineered for Energy Independence
This robust system includes:
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40.9kWh of usable energy capacity with high-performance LFP battery modules
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One 12,000W Lux hybrid inverter, offering 12kW of continuous output
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Support for solar PV systems up to 18,000W, with 3 MPPT inputs for optimal efficiency
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Built-in UPS functionality to maintain seamless power during outages
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Advanced energy features, including AC coupling, peak shaving, and smart load control
Built for Homeowners, Designed for Longevity
The 12kW 40.9kWh ETHOS ESS is crafted with both safety and convenience in mind:
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Modular and stackable architecture for easy expansion as your energy needs grow
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IP65-rated weather-resistant enclosure suitable for garages, sheds, or outdoor installations
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Internal fire suppression system and advanced BMS with automatic cell balancing
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Interactive LED display with CANBus and RS485 protocols for real-time system data
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Quick wall-mount setup with included hardware
Optimize Your Home’s Energy Strategy
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Slash your electricity bills by storing excess solar energy for later use
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Capitalize on net metering programs and take advantage of federal/state tax incentives
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Ensure backup power for essentials like refrigerators, lighting, and electronics during outages
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Perfect for single-family homes, large residences, or off-grid applications
Why the 12kW 40.9kWh ETHOS Energy Storage System (ESS)?
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Delivers dependable, high-capacity energy every day
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Offers premium safety features built for long-term residential use
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Easily integrates with new or existing solar panel systems
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Backed by BigBattery’s expertise in cutting-edge lithium battery technology
Take full control of your home's power with the 12kW 40.9kWh ETHOS Energy Storage System (ESS) — a reliable, efficient, and intelligent energy storage solution that supports energy savings, resilience, and independence.
What's Included
8 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box
2 × ETHOS RACK BASE
1 × LUXPower 12kW Hybrid Inverter
1 × 10kWh Ethos Controller to Battery Power Cable 31.5" inch (800mm)
2 × Ethos Parallel Comm Cable 4.9 ft (150cm)
4 × Ethos Parallel Power Cable 4.9 ft (1500mm)
Specs and Downloads
System Spec Sheet
Inverter Spec Sheet
Single Stack Tech Specs
| SKU: | K0753 |
| 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 |
Inverter
Registration & WiFi Setup Guide
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
Get your 30% Tax Solar Credit!
Unlock substantial savings with the government's Solar Tax Credit, which offers a robust 30% deduction on the installation costs of solar systems. This attractive incentive is your ticket to leveraging solar energy's eco-friendly potential while enjoying the financial benefits.
At Solar Guys Pro, our commitment is to you. Please be reminded that our expertise does not extend to tax advice. Nonetheless, our dedicated staff is eager to guide you through the process and ensure you capitalize on this exceptional offer.
Contact us now to learn more!