Big Battery | 48V ETHOS | 15.3KWH (3 Module)
48V ETHOS | 15.3kWh (3 Module)
Stackable Home Battery Storage for Reliable Solar and Backup Power
The 48V ETHOS | 15.3kWh (3 Module) from BigBattery is a compact, modular energy storage solution designed to power your off-grid setup, solar system, or emergency backup needs. With a fully stackable design, it’s easy to expand and customize as your energy demands grow.
Whether you're powering a cabin, tiny home, or upgrading your home’s solar storage, the ETHOS delivers efficient, safe, and year-round energy performance.
Smart Design, Built for Safety
Each system includes a control box with an LED display for easy monitoring. You can track real-time performance using CANBus and RS485 communication protocols, ensuring you stay informed about your system's health.
Safety comes first with an IP65-rated enclosure that protects against dust and moisture, along with an internal fire suppression system. The advanced Battery Management System (BMS) ensures long-lasting performance through auto cell-balancing.
Key Features:
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15.3kWh Battery Capacity (3 Modules)
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Modular & Stackable Design – Easily expandable for future energy needs
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Advanced BMS – Auto-cell balancing for maximum efficiency and battery life
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IP65-Rated Casing – Weather-resistant and built for long-term use
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Built-in Safety – Fire suppression system included
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Real-Time Monitoring – LED display with CANBus and RS485 protocols
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Ideal for Solar & Backup Power – Supports cabins, homes, and off-grid setups
Compact Power, Ready to Grow
The 48V ETHOS | 15.3kWh (3 Module) is part of BigBattery’s expandable ESS line. Available in both 2-stack (10.24kWh) and 3-stack (15.3kWh) setups, it grows with your lifestyle and energy needs.
What's Included
3 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box
1 × 10kWh Ethos Controller to Battery Power Cable 31.5" inch (800mm)
Specs and Downloads
| 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 |
| 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 |
| 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!
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! All products on Solar Guys Pro are 100% brand-new and in perfect condition.
We do not sell any used or refurbished items.
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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