BigBattery 48V 30.7kWh ETHOS Stackable Battery Kit – Dual EG4 18kPV Hybrid Inverters (ESS)
Power your entire home with confidence using the BigBattery 48V ETHOS System, delivering a massive 30.7kWh of premium LiFePO₄ storage and paired with two EG4 18kPV Hybrid Inverters for unbeatable performance, scalability, and savings. This system is built for whole-home energy storage, perfect for grid-tied homes, cabins, off-grid estates, and large-scale residential installations.
The ETHOS is BigBattery’s most advanced energy storage solution, designed with Tier 1 LFP cells, a stackable, modular architecture, and a weather-resistant IP65-rated enclosure for long-lasting, outdoor-safe operation. Whether you're offsetting your electric bill with solar or preparing for rolling blackouts, the ETHOS system ensures reliable, safe, and efficient energy day in and day out.
Each battery module includes an integrated BMS with auto cell balancing, thermal protection, and a built-in fire suppression system, giving you maximum peace of mind. The ETHOS Control Boxes feature interactive LED displays for real-time system monitoring, and include RS485/CANBus communication to keep you connected to your energy at all times.
This kit is powered by two EG4 18kPV 12kW Hybrid Inverters, each capable of handling up to 18,000W of PV input (36,000W combined), featuring three MPPTs, AC coupling, integrated UPS modules, touchscreen displays, smart load control, and peak shaving capabilities. These high-performance inverters support seamless on/off-grid switching, parallel operation, and are perfect for maximizing solar usage, participating in net metering, and protecting against unstable grids.
Key Features:
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Battery Capacity: 30.7kWh (6 × 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 Hybrid Inverters with 36,000W Total PV Input & 6 MPPTs Combined
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BMS: Advanced protection with cell balancing, fire suppression, and thermal regulation
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Cold Weather Ready: IP65-rated outdoor casing with long-term durability
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Monitoring: Real-time LED display on Control Boxes + LCD touchscreens on each inverter
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Expandability: Stackable up to 80kWh per system; inverter scalable for higher loads
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Grid-Tied Ready: Supports AC coupling, net metering, and peak shaving functions
Perfect For:
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Whole-Home Solar Backup
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Cabins, Tiny Homes, and Family Homes
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Off-Grid Homesteads
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Large Residential & Estate Power Systems
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Emergency Backup Power
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Grid-Tied Utility Savings & Net Metering
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Lead Acid Replacement
What’s Included:
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6 × 48V ETHOS 5.12kWh Stackable Battery Modules – FETHS-48051-G1
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2 × ETHOS Control Boxes – CNT060
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2 × EG4 18kPV Hybrid Inverters – INV024
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2 × 15kWh ETHOS Controller to Battery Power Cables (4ft) – CBL091
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1 × Parallel Busbar – CNT015
Specifications
Single Stack Tech Specifications
| SKU: |
K0959 |
| GTIN-12 (U.P.C.): |
850061252142 |
| 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: |
Click Here |
| User Manual: |
Click Here |
| UL9540 Certification: |
Click Here |
| UL9540A Certification: |
Click Here |
| UL1973 Certification: |
Click Here |
| UN38.3 Certification: |
Click Here |
| Safety Data Sheet: |
Click Here |
| View Our CEC Listing: |
Click Here |
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
