BigBattery 48V 61.4kWh ETHOS Stackable Battery Kit – Dual EG4 18kPV Hybrid Inverters (ESS)
Power your entire estate with the BigBattery 48V 61.4kWh ETHOS System, the ultimate energy storage solution for large homes, multi-room residences, and luxury properties. This system delivers 61.4kWh of reliable LiFePO₄ storage, paired with two powerful 12000W EG4 18kPV Hybrid Inverters, making it ideal for grid-tied solar, whole-home backup, and long-term utility savings.
The ETHOS system is engineered with Tier 1 lithium iron phosphate cells, built into a stackable, modular architecture for scalable capacity and effortless installation. With its IP65-rated outdoor-ready casing, internal fire suppression, and auto-balancing BMS, this system offers unmatched safety, durability, and peace of mind—even in extreme conditions.
Each ETHOS Control Box includes an interactive LED interface for real-time performance monitoring and diagnostics. Plus, with RS485 and CANBus communication, you can stay connected to your system's health and status at all times.
This powerhouse system also includes two EG4 18kPV Hybrid Inverters, each equipped with a touchscreen LCD, three MPPTs, smart load control, AC coupling, and integrated UPS modules for seamless transitions between grid and battery. Together, these inverters support up to 36,000W of solar input, helping you slash utility bills, stabilize your home power, and participate in net metering and solar incentives.
Key Features:
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Battery Capacity: 61.4kWh (12 × 5.12kWh ETHOS Modules)
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System Voltage: 48V
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Battery Chemistry: LiFePO₄ (Lithium Iron Phosphate)
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Inverter: 2 × 12000W EG4 18kPV Hybrid Inverters with 36,000W Total PV Input & 6 MPPTs Combined
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BMS: Advanced cell balancing, thermal protection, fire suppression
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Enclosure: IP65-rated, stackable, outdoor-rated, and maintenance-free
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Cold Weather Ready: Built to operate year-round in any climate
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Monitoring: Real-time LED system display + inverter touchscreen interface
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Scalability: Expandable up to 80kWh per control box, with scalable inverter capacity
Perfect For:
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Multi-Room & Multi-Level Family Homes
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Whole-Home Solar Energy Systems
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Cabins, Homesteads, and Off-Grid Estates
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Emergency & Grid-Backup Power
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Energy Cost Savings through Net Metering
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Replacing Lead-Acid with Long-Lasting Lithium
What’s Included:
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12 × 48V ETHOS 5.12kWh Stackable Battery Modules – FETHS-48051-G1
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2 × ETHOS Control Boxes – CNT060
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2 × ETHOS Rack Bases – CNT081
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4 × Ethos Parallel Power Cables (4.9 ft) – CBL089
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2 × Ethos Parallel Comm Cables (4.9 ft) – CBL096
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2 × EG4 18kPV Hybrid Inverters – INV024
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1 × Parallel Busbar – CNT015
Specifications
Single Stack Tech Specifications
| SKU: |
K0961 |
| GTIN-12 (U.P.C.): |
850061252036 |
| 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 |
| Spec Sheet: |
Spec Sheet |
| User Manual: |
User Manual |
| UL9540 Certification: |
UL9540 Certification |
| UL9540A Certification: |
UL9540A Certification |
| UN38.3 Certification: |
UN38.3 Certification |
| Safety Data Sheet: |
Safety Data Sheet |
| View Our CEC Listing: |
View Our CEC Listing |
Inverter Downloads
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
