Big Battery | ETHOS 2x Expansion Kit
ETHOS 2x Expansion Kit (10.24kWh)
Unlock more power with the ETHOS 2x Expansion Kit—a high-performance 10.24kWh battery expansion designed to seamlessly upgrade your existing BigBattery 48V ETHOS System. Whether you’re expanding your residential solar setup or preparing for grid outages, this kit delivers reliable, scalable energy storage tailored to your evolving power needs.
Expand Smarter, Store More
The ETHOS 2x Expansion Kit includes:
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Two (2) 48V ETHOS LiFePO4 battery modules (5.12kWh each)
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Rugged rack base for easy installation
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All required communication and power cables
Each module connects in parallel to your existing ETHOS Control Box (sold separately), supporting up to 16 modules per system. This modular approach gives you the flexibility to scale your storage as your energy demand grows.
Advanced Battery Technology
Engineered with Tier 1 LiFePO4 cells, the ETHOS Expansion Kit offers:
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Superior safety with thermal stability and internal fire suppression
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Long cycle life and high energy efficiency
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Intelligent BMS with auto cell-balancing, over/under voltage, and overcurrent protection
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CANBus and RS485 communication for full system integration and remote diagnostics
Built for Homes, Offices & Off-Grid Living
Perfect for:
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Residential solar energy systems needing more battery capacity
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Tiny homes, cabins, or homesteads running off-grid
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Backup power for critical appliances and home offices
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Systems leveraging net metering and federal tax credits
Why Choose the ETHOS 2x Expansion Kit?
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Add 10.24kWh of safe, renewable power to your existing ETHOS setup
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Reduce reliance on the grid and lower utility bills
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Stay powered during outages or time-of-use peak pricing
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Future-proof your solar investment with scalable technology
What's Included
2 × 48V ETHOS 5.12kWh Stackable Battery Module
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
Tech Specs
| SKU: | KIT0698 |
| GTIN-12 (U.P.C.): | 850061252173 |
| 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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At Solar Guys Pro, our commitment is to you. Please be reminded that our expertise does not extend to tax advice. Nonetheless, our dedicated staff is eager to guide you through the process and ensure you capitalize on this exceptional offer.
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