Big Battery 48V ETHOS 15.3KWH (3 Module)

Name: Big Battery 48V ETHOS 15.3KWH (3 Module)
Brand: Big Battery
SKU: K0950
Price: 4030.0 USD
Availability: InStock

BY: Big Battery

SKU: K0950

| Availability: In stock

$6,450.00

$4,030.00

You Save: $2,420.00

Product Highlights

Built for home backup and off-grid power
15,360 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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Big Battery 48V ETHOS 15.3KWH (3 Module)

Power your home, cabin, or off-grid setup with the BigBattery 48V ETHOS 15.3kWh System, featuring three stackable 5.12kWh LiFePO4 battery modules. Designed for scalability, safety, and long-term reliability, this system provides robust backup, solar storage, and off-grid energy with UL-certified safety, integrated BMS, and fire suppression. Whether you're replacing lead-acid or upgrading your solar system, the ETHOS ensures efficient and secure energy storage for any 48V application.

BigBattery 48V ETHOS 15.3kWh (3 Module) Features

High-Capacity Storage – Provides a total of 15.36kWh from three 5.12kWh modules—ideal for home backup, solar storage, or full off-grid living.

Stackable & Modular Design – Add modules as needed and scale up to 80kWh per control box for large systems or growing power needs.

Tier 1 LiFePO4 Cells – Safe, stable lithium iron phosphate chemistry offers 7,000–8,000 cycles at 80% DoD, ensuring 10+ years of reliable performance.

Integrated Smart BMS – Real-time monitoring of voltage, temperature, and current, plus passive balancing and built-in safety protections.

UL-Certified & Fire Suppression – Meets UL1973, UL9540A, and UN38.3 certifications and includes an internal fire-extinguishing module.

Weather-Resistant & Wall-Mountable – Features an IP65-rated enclosure, included mounting brackets, and a space-saving design for indoor or outdoor installation.

BigBattery 48V ETHOS 15.3kWh (3 Module) Applications

Designed for 48V Applications – Perfect for residential, solar, and off-grid systems using 48V architecture.
Residential Power Systems – Store energy for time-of-use optimization or backup during outages.
Home Solar Systems – Capture and store excess solar energy for nighttime or grid-free use.
UL-Certified ESS – Fully compliant for code-approved installs.
Cabins & Tiny Homes – Ideal for efficient off-grid living in small or mobile dwellings.
Family Homes & Mansions – Scalable capacity supports large household energy demands.
Off-Grid Homesteads – Power remote homes independently of the grid.
Emergency Power – Always-on backup when disaster strikes.
Whole Home Backup – Use multiple modules to power essential or full home circuits.
Lead Acid Replacement – Upgrade to modern lithium performance and longevity.
Intense Heat & Cold – Built for extreme climates with wide operating temperature tolerance.

What's Included

Everything you need is included with your product.

3 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box

1 × 15kWh Ethos Controller to Battery Power Cable 4ft (1220mm)
User Manual

BigBattery 48V ETHOS 15.3kWh (3 Module) Specifications

Category	Specifications
SKU	K0950
UPC	850061252166
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)
Dimensions (DxWxH)	6.7 x 26.5 x 59.8 in (170 x 674 x 1520 mm)
Weight	387 lbs (175.5 kg)
Max Connections	Up to (16) parallel connections per control box
Communications	CANBus / RS485
Protection Rating	IP65
Certifications	UL9540, UL9540a, UL1973, & UN38.3

BigBattery 48V ETHOS 15.3kWh (3 Module) Videos

Frequently-Asked Questions

Can I add more modules to this setup?

Yes. The ETHOS system is expandable—up to 80kWh per control box—so you can scale as your energy needs grow.

Is this compatible with my 48V inverter?

Most likely. ETHOS works with many major 48V inverters. Be sure to check your inverter’s voltage and current specs to confirm compatibility.

Is the battery weatherproof?

Yes, with its IP65-rated enclosure, the ETHOS is protected from dust and water spray—safe for both indoor and sheltered outdoor use.

Does this system require an external BMS?

No. Each module includes a fully integrated Battery Management System, eliminating the need for external components.

Manual and Specification Sheet

BigBattery 48V ETHOS 15.3kWh (3 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.

We size the system, not just sell it. Call before you order and a sales engineer will check the kit against your actual loads, tell you if you’re buying too much or too little, and list the site-specific parts your install will need.
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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Our Customers Tell It Better Than We Do

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Trusted By 10,000+ Customers. See All Reviews.

They Stood By Me

I was a DIY solar power wannabe... that is 'til I connected with Manny... The man's a prince! He not only knows his stuff; he walked me through all things electrical. To make sure I had all I needed... he gave me his cell phone # to text him anytime I got confused... nights and weekends included. The prices were very competitive... definitely go with Manny -- you won't go wrong!

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I'm about to go off grid. I called Manny, he walked me through everything so I could truly understand what I needed and never tried to upsell me. He was honest and made a customer for life.

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Easy Return

I would personally like to thank Manny... I purchased the inverter and decided I needed to return it... Manny was very understanding and went out of his way to help me return the product and not even have to pay for shipping return. He gives this company reputation, honor and quality customer service!

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I have been talking with Manny the owner... He has not only helped me design a system but he's been assisting with the install and components. I am super pleased so far with the assistance.

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We added 2 more batteries to our current set up. Pleased with the customer service from Off-Grid Source! Will be back!

Jason

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Very fast response times. Very professional. I highly recommend!

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Big Battery 48V ETHOS 15.3KWH (3 Module)

Product Highlights

Big Battery 48V ETHOS 15.3KWH (3 Module)

BigBattery 48V ETHOS 15.3kWh (3 Module) Features

BigBattery 48V ETHOS 15.3kWh (3 Module) Applications

What's Included

BigBattery 48V ETHOS 15.3kWh (3 Module) Specifications

BigBattery 48V ETHOS 15.3kWh (3 Module) Videos

Frequently-Asked Questions

Manual and Specification Sheet

Shipping & Easy Returns

Why Buy From Us

Why Choose Off Grid Source

Our Customers Tell It Better Than We Do

They Stood By Me

Awesome Service!

Real Person, Honest Service.

Easy Return

Totally Off Grid.

Great Product! Fast Shipping

Excellent Customer Service