Skip to content
LOWEST PRICES GUARANTEED | NO SALES TAX | SPEAK WITH AN EXPERT: (916)-999-9937
Lowest Prices Guaranteed | SPEAK WITH AN EXPERT: (916)-999-9937
Big Battery ETHOS 3x Expansion Kit

Big Battery ETHOS 3x Expansion Kit

by Big Battery
SKU K0699
$5,510.00 - $5,510.00
$5,510.00
$5,510.00 - $5,510.00
$5,510.00
🚚 Fast Delivery Times

💰 Lowest Price Guaranteed

🛡️Premium Authorized Big Battery Dealer - Warranty Included

🧑🏻‍💼Post-Purchase Lifetime Customer Support

❓Questions? Talk to Experts (916)-999-9937

Big Battery ETHOS 3x Expansion Kit

Included Components

3 × 48V ETHOS 5.12kWh Stackable Battery Module (FETHS-48051-G1)

1 × ETHOS RACK BASE (CNT081)

2 × Ethos Parallel Power Cable 4.9 ft (1500mm) (CBL089)

1 × Ethos Parallel Comm Cable 4.9 ft (1500mm) (CBL090)



REVOLUTIONIZING RESIDENTIAL ESS! BigBattery’s 48V ETHOS systems are here, and this 15.36kWh Expansion Kit is the ideal solution for upgrading your current ETHOS System in your home or office. Please note that this Expansion Kit does not include a Control Box, and these 3 stackable battery modules (up to 16 total per Control Box) can be connected in parallel to your ETHOS Control Box to complete an energy storage system that fits your specific power needs.

This kit comes with the 3 ETHOS battery modules, a rack base, and each power and communication cable needed to easily connect your additional batteries to your existing ETHOS System. 

Whether you’re looking to ensure emergency backup power is always available, or you’re looking to outfit your home with a powerful solar system, the ETHOS ensures reliable, efficient power delivery day in and day out, allowing you to save on utilities, or get rewarded for giving back to the grid through net metering programs and other tax incentives. Take control of your home’s power and shop the 48V ETHOS & ETHOS Expansion Kits today!


Tech Specs

SKU: KIT0699
GTIN-12 (U.P.C.): 850061252180
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
Communications: CANBus / RS485
Spec Sheet Download: Click Here
User Manual Download: Click Here
UL9540 Certification Download: Click Here
Safety Data Sheet Download: Click Here