BigBattery Ethos 20.2kWh Stackable Battery (4 Module) - FREE SHIPPING
£2,811.00
Sale price
£2,811.00
Regular price
£3,213.00
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BigBattery Ethos 20.2kWh Stackable Battery (4 Module) - FREE SHIPPING
£2,811.00
Sale price
£2,811.00
Regular price
£3,213.00
Shipping calculated at checkout.
ETHOS20.2
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Description
The Ethos 20.2 kWh Stackable Battery System is a powerful, modular, and expandable energy-storage solution designed to deliver large-scale performance for full-home backup, off-grid systems, and commercial energy applications. Combining four 5.12 kWh modules, this system offers high energy density, long cycle life, and seamless integration with hybrid and off-grid inverters.
Key Features
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Quad-Module Configuration: Delivers 20.48 kWh of usable capacity at 51.2 V nominal.
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Safe & Durable LiFePO₄ Chemistry: Long cycle life, superior thermal stability, and minimal maintenance.
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Smart Power Management: Integrated BMS with CANBus/RS485 ensures real-time monitoring and safe parallel operation.
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Pre-Assembled Stack with Control Box: Simplifies wiring and inverter connectivity for faster installations.
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IP65 Enclosure: Built for indoor or semi-outdoor environments with resistance to dust and moisture.
Product Overview
The Ethos 20.2 kWh system combines four Ethos 51.2 V 100 Ah lithium-iron-phosphate (LiFePO₄) modules in parallel to create a unified storage solution that’s as safe as it is scalable. Designed for both residential and commercial energy storage, this configuration provides a total capacity of 20.48 kWh with excellent energy efficiency and reliable output.
Each Ethos module features its own Battery Management System (BMS) for precision control, communication, and protection. When stacked, the modules communicate with a central Ethos Control Box, which manages inverter connections through pre-terminated power and communication cables. This architecture minimizes installation complexity and ensures each stack operates in sync.
Thanks to its LiFePO₄ chemistry, this system achieves exceptional longevity — rated for 4,000 – 8,000 cycles at 80 % depth of discharge — and maintains over 95 % round-trip efficiency. The robust IP65 housing allows for flexible installation in basements, garages, or protected outdoor structures.
Engineered for expandability, the 20.2 kWh Ethos stack can be scaled up with additional modules and control boxes, offering long-term adaptability for growing power requirements.
Technical Specifications
| Specification | Details |
|---|---|
| Configuration | 4 × Ethos 5.12 kWh Modules |
| Nominal Voltage | 51.2 V |
| System Voltage | 48 V nominal |
| Total Capacity | 20.48 kWh (400 Ah) |
| Cell Configuration | 16S × 4P |
| Charging Voltage Range | 55.6 – 57 V |
| Maximum Charge Voltage | 57 V |
| Operating Voltage Range | 48 – 57 V |
| Suggested Low Voltage Cutoff | 48 – 50.8 V |
| Max Continuous Discharge Current | 200 A |
| Peak Discharge Current | 300 A (≤ 5 s) |
| Max Charge Current | 200 A |
| Round-Trip Efficiency | ≥ 95 % |
| Chemistry | Lithium Iron Phosphate (LiFePO₄) |
| Cycle Life | 4,000 – 8,000 cycles @ 80 % DoD |
| Communication | CANBus / RS485 |
| Enclosure Rating | IP65 |
| Charge Temp Range | 0 °C – 45 °C (32 °F – 113 °F) |
| Discharge Temp Range | –20 °C – 60 °C (–4 °F – 140 °F) |
| Storage Temp (SOC > 50 %) | –20 °C – 45 °C (–4 °F – 113 °F) |
| Dimensions (approx. stacked) | 170 × 674 × 2000 mm (6.7 × 26.5 × 78.7 in) |
| Weight (approx. stacked) | ≈ 230 kg (507 lbs) |
| Certifications | UL9540A, UL1973, UN38.3 |
| Design Life / Warranty | 10 + years / 10-year warranty |
Included in Kit
ETHOS 20.2 kWh (4 Module)
Included in Kit:
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(4) FETHS-48051-G1 – 5.12 kWh Ethos Battery Modules
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(1) CNT060 – Ethos Control Box
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(1) CNT081 – Ethos Base (Base Only)
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(2) CBL089 – Ethos Stack-to-Stack Power Cable Pair 4.9 ft (1500 mm)
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(1) CBL090 – Ethos Stack-to-Stack Comm Cable 4.9 ft (1500 mm)
Applications
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Whole-home backup and off-grid systems
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Commercial solar storage and load-management
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Hybrid solar installations with high demand loads
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Expandable microgrids and community power systems
Return policy
Our goal is for every customer to be totally satisfied with their purchase. If this isn't the case, let us know and we'll do our best to work with you to make it right.
Shipping
We will work quickly to ship your order as soon as possible. Once your order has shipped, you will receive an email with further information. Delivery times vary depending on your location.
Manufacturing
Our products are manufactured both locally and globally. We carefully select our manufacturing partners to ensure our products are high quality and a fair value.