Big Battery 48V ETHOS 20.2KWH (4 Module)

Name: Big Battery 48V ETHOS 20.2KWH (4 Module)
Brand: Big Battery
SKU: K0951
Price: 5320.0 USD
Availability: InStock

BY: Big Battery

SKU: K0951

| Availability: In stock

$8,550.00

$5,320.00

You Save: $3,230.00

Product Highlights

Built for home backup and off-grid power
10,240 Wh capacity for extended backup and off-grid runtime
Purpose-built hardware secures compatible solar modules and racking
Expandable design lets stored power grow with future needs

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BigBattery 48V ETHOS 20.2kWh (4 Module)

Step into whole-home power independence with the BigBattery 48V ETHOS 20.2kWh system. This modular setup includes four stackable 5.12kWh LiFePO4 battery modules, delivering a total of 20.48kWh—perfect for home solar storage, off-grid living, emergency backup, and commercial energy systems. Built with Tier 1 LiFePO4 cells, integrated advanced BMS, and UL-certified fire safety features, ETHOS is a high-performance solution designed for serious energy needs.

BigBattery 48V ETHOS 20.2kWh (4 Module) Features

High-Capacity Storage – Provides a total of 20.48kWh of energy—ideal for full-home backup, larger off-grid properties, and commercial power systems.

Stackable & Modular Design – Easily expand your system up to 80kWh per control box by stacking additional modules. Built for scalability and clean integration.

Tier 1 LiFePO4 Cells – Delivers 7,000–8,000 cycles at 80% Depth of Discharge (DoD) with high thermal stability, safety, and long lifespan (10+ years).

Integrated Smart BMS – Each module includes a Battery Management System for real-time monitoring, passive balancing, and full electrical protection.

UL-Certified Safety + Fire Suppression – Meets UL1973, UL9540A, and UN38.3 certifications with a built-in fire extinguishing module for unmatched peace of mind.

Indoor/Outdoor Ready – The IP65-rated enclosure allows for both indoor and outdoor installation, with wall-mountable hardware for space-saving deployment.

BigBattery 48V ETHOS 20.2kWh (4 Module) Applications

Designed for 48V Applications – Seamlessly integrates with 48V solar, inverter, and backup systems.
Residential Power Systems – Store solar energy and reduce grid dependence or electricity bills.
Home Solar Systems – Capture and store solar power efficiently with smart control and safe discharge.
UL-Certified ESS – Approved for residential and commercial energy storage installations.
Cabins & Tiny Homes – Clean, compact energy for off-grid setups with expandable capacity.
Family Homes & Mansions – Scalable storage to power large households with heavy loads.
Off-Grid Homesteads – Deliver long-lasting energy storage where grid power isn't available.
Emergency Power – Reliable backup solution for power outages or natural disasters.
Whole Home Backup – Use one or more ETHOS systems to power essential circuits or the entire home.
Lead Acid Replacement – Modern lithium performance with none of the maintenance of lead acid.
Intense Heat & Cold – Built to perform in extreme weather conditions with a wide operating temperature range.

What's Included

Everything you need is included with your product.

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)
User Manual

BigBattery 48V ETHOS 20.2kWh (4 Module) Specifications

Category	Specifications
SKU	K0951
UPC	850061252081
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 / NEMA 4X
Communications	CANBus / RS485
Certifications	UL9540A, UL1973, & UN38.3

BigBattery 48V ETHOS 20.2kWh (4 Module) Videos

Frequently-Asked Questions

Can I expand this system later?

Yes. The ETHOS system is modular and can be scaled up to 80kWh per control box. Add more modules anytime as your energy needs grow.

Is this compatible with my inverter?

It’s compatible with most 48V inverters, but always confirm voltage and communication specs with your inverter brand for full integration.

Can I install this outdoors?

Yes. The IP65-rated enclosure allows for indoor and outdoor installation, though covered areas are preferred for long-term exposure.

Do I need a separate BMS or controller?

No. Each module comes with a built-in Smart BMS, so no external BMS is required.

Manual

BigBattery 48V ETHOS 20.2kWh (4 Module) Manual

Shipping & Easy Returns

Shipping is free across the Lower 48. No fuel surcharges, no residential fees, and no liftgate charge on freight orders. The price you see is the price you pay. Read our full Shipping Policy here.

Most orders leave the warehouse in 1 to 2 business days and arrive within 3 to 10 business days. We send tracking the moment it ships.

Anything that ships on a pallet goes freight with liftgate and pallet jack included, so the driver gets it off the truck and onto the ground at your address. The carrier will call you directly to schedule a delivery window.

Returns are 30 days from delivery. For freight deliveries, inspect the shipment before you sign for it. If something is damaged in transit, note it on the delivery receipt and we handle the freight claim, not you. Read more about our Returns Policy here.

Why Buy From Us

Buying solar online should not mean guessing your way through the install. Here’s what you get with Off-Grid Source.

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A+ rated by the Better Business Bureau. Another trust signal that you’re buying from a real company that stands behind the sale.
Free shipping across the Lower 48. No hidden freight charges, residential fees, or liftgate surprises at checkout.
Guaranteed best prices. Find the same product for less elsewhere and we’ll match it.
30-day easy returns. If it is not the right fit, we’ll help you get it sent back.
A real person on the phone. Product questions, sizing, install planning, warranty help: call us at +1 (877) 556-3347.

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