Big Battery | 4x 48V ETHOS (20.48kWh) Home Battery Backup
48V ETHOS | 20.2kWh (4 Module)
Reliable Energy Storage for Off-Grid and On-Grid Power Needs
The 48V ETHOS | 20.2kWh (4 Module) system by BigBattery is a powerful and dependable solution for residential energy storage. Whether you're living off-grid, powering a large cabin, or preparing for outages, this system delivers clean and consistent energy every day.
Built for Performance and Flexibility
This 20.2kWh configuration is perfect for homes that need more energy storage. The stackable, modular design makes it easy to expand if your energy demands grow over time. The system is protected by a durable IP65-rated enclosure that stands up to harsh weather and indoor environments.
Advanced Safety and Monitoring
The ETHOS system is equipped with an advanced Battery Management System (BMS) that provides auto cell-balancing for long-term battery health. It also includes an internal fire suppression system for added protection.
You can easily keep an eye on system performance using the interactive LED display on the control box, with CANBus and RS485 communication protocols for real-time monitoring and system updates.
Key Features:
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20.2kWh Battery Capacity (4 Modules) – Ideal for off-grid homes, cabins, or emergency backup
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48V System Voltage – Reliable and compatible with solar and hybrid systems
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Modular & Stackable – Expandable to meet future energy needs
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Advanced BMS – With cell balancing and fire suppression built-in
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Weather-Resistant (IP65) – Long-lasting protection in any environment
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Live System Monitoring – LED control box with CANBus & RS485 for real-time insights
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Works On-Grid or Off-Grid – Flexible for any home setup
Power Your Home with Confidence
Whether you're optimizing a solar setup or preparing for power outages, the 48V ETHOS | 20.2kWh (4 Module) system gives you reliable, scalable power you can count on. Take control of your energy and enjoy peace of mind with advanced safety features and smart monitoring.
What's Included
4 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box
1 × ETHOS RACK BASE
2 × Ethos Parallel Power Cable 4.9 ft (1500mm)
1 × Ethos Parallel Comm Cable 4.9 ft (150cm)
Specs and Downloads
| 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 |
| Communications: | CANBus / RS485 |
| Certifications: | UL9540, UL9540a, UL1973, & UN38.3 |
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!
Being an authorized retailer means we carry the same warranty as the manufacturer, protecting your purchase!
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! By default, all products on Solar Guys Pro are 100% brand-new and in perfect condition.
If an item is used or refurbished, it will clearly indicate so in the title of the product as well as the discription.
For example, a used Battery will say:
XYZ Battery | 48V 100AH (REFURBISHED)
If you'd like to confirm, you can always send us a email at info@solarguyspro.com
Orders over $500 include a FREE (Normally $149.99) 80-Page DIY Solar eBook — added automatically at checkout.
Frequently Asked Questions
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