BigBattery ETHOS 12kW 20.4kWh Off-Grid Power System
The BigBattery ETHOS 48V 20.4kWh Power System is a top-tier, off-grid energy solution designed for those who need maximum power capacity, reliability, and efficiency. Whether you're powering a large off-grid home, cabin, homestead, or backup system, this setup delivers serious energy independence backed by advanced lithium technology and cutting-edge inverter capabilities.
This configuration includes four 48V 5.12kWh LiFePO4 battery modules (20.48kWh total), paired with the powerful EG4 12000XP 12kW split-phase inverter, capable of handling up to 24,000W of solar PV input. With its modular, stackable design, included mounting hardware, smart load management, and full system monitoring, the ETHOS is the ultimate turnkey power solution for demanding off-grid applications.
Key Features:
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Battery Capacity: 20.48kWh (Expandable, modular, stackable design)
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Voltage: 48V – Ideal for full off-grid homes, workshops, or large systems
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Chemistry: Lithium Iron Phosphate (LiFePO4)
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Inverter: EG4 12kW split-phase inverter/charger with 24kW PV support
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MPPT Inputs: Dual MPPTs with 24000W solar input capacity
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Smart Monitoring: LED status display, inverter LCD touchscreen
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Communication: CANBus & RS485 protocols
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Safety Features: IP65-rated casing, built-in fire suppression, auto cell balancing
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Installation: Includes wall-mount and rack base for fast, secure setup
Designed For 48V Applications
- Residential power systems
- Home solar systems
- Cabins & tiny homes
- Family homes & mansions
- Off-grid homesteads
- Emergency power
- Whole home backup
- Lead acid replacement
Benefits:
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Reliable lithium battery technology with extended cycle life
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Supports peak shaving and time-of-use optimization
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Easily scalable for larger storage needs
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Compatible with various solar PV setups and inverters
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Designed for continuous, off-grid energy supply
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30% Federal Tax Credit Available
What’s Included:
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4 × 48V ETHOS 5.12kWh Stackable Battery Modules – Model: FETHS-48051-G1
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1 × ETHOS Control Box – Model: CNT060
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1 × ETHOS Rack Base – Model: CNT081
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1 × EG4 12kW Off-Grid Inverter (24kW PV Input) – Model: INV030
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1 × Parallel Communication Cable (4.9 ft / 150cm) – Model: CBL096
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2 × Parallel Power Cables (4.9 ft / 1500mm) – Model: CBL089
Specifications
Product Specifications
| 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 |
Why Buy From Us
Why Buy From Ecogrid Supply?
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Authorized & Trusted Dealer: We’re fully authorized for every brand we carry, so you get genuine products with full manufacturer warranties.
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Fast, Reliable Shipping: All items ship from our U.S. warehouses with quick and dependable freight options to keep your project on track.
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30-Day Hassle-Free Returns: Change your mind? No worries — enjoy a simple 30-day return process for peace of mind.
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Real Human Support, 7 Days a Week: Reach us by phone, email, or live chat — no bots, no overseas call centers, just real people who know off-grid power systems.
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Expert Energy Guidance: Our solar and backup energy specialists are ready to help you with design, planning, product questions, and installation tips.
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USA-Based Service: Our team proudly operates here in the United States, providing local, knowledgeable, and friendly support.
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Secure Payments: Shop confidently with our encrypted, secure checkout to protect your personal and payment information.
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Built for Energy Independence: Whether you’re powering a cabin, prepping for emergencies, or going off-grid, our products are selected for performance, reliability, and sustainable operation.
Buying Guide
