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BigBattery 48V ETHOS 5.12kWh Stackable LiFePO4 Battery Module

Stackable LiFePO4 Storage Built for Off-Grid Demand

Tier 1 LiFePO4 cells — Proven chemistry for 10+ year cycle life
Scale to 80kWh — Up to 16 modules per Control Box
IP65 weatherproof casing — Built to survive dust, rain, and humidity
Fire-extinguishing built in — Integrated suppression module for maximum safety
Advanced BMS monitoring — Real-time voltage, current, and temperature data
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- LTL freight included on all orders, no surprise charges
  • Compatibility Guarantee -- Components pre-vetted to work together

$1,527.95

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BigBattery | 48V ETHOS 5.12kWh Stackable Battery Module
BigBattery | 48V ETHOS 5.12kWh Stackable Battery Module
$1,527.95

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In the box

  • 1x BigBattery 48V ETHOS 5.12kWh Battery Module
  • UL-certified connection hardware
  • Product documentation
BigBattery | 48V ETHOS 5.12kWh Stackable Battery Module
BigBattery 48V ETHOS 5.12kWh Stackable LiFePO4 Battery Module
$1,527.95

Stackable LiFePO4 Storage Built for Off-Grid Demand

The BigBattery 48V ETHOS 5.12kWh module delivers field-tested LiFePO4 energy storage that scales from a single unit up to 80kWh per Control Box. With an IP65 weatherproof casing, built-in fire-extinguishing modules, and UL-certified connectors, this battery is built-to-survive in grid-independent setups ranging from remote cabins to solar-backed homesteads. The advanced BMS monitors voltage, current, and temperature in real time, so you always know exactly what your bank is doing.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
IP65 Weatherproof Casing
Built-In Fire Extinguisher
Tier 1 LiFePO4 Cells
UL-Certified Connectors
5.12 kWh
Capacity Per Module
80 kWh
Max Per Control Box
48V
System Voltage
Stop Guessing — Buy a Battery That Talks to Your System

Stop Guessing — Buy a Battery That Talks to Your System

You've seen the forum posts — someone bought a battery from one vendor, an inverter from another, and the BMS won't communicate. Months of troubleshooting, thousands wasted. The BigBattery 48V ETHOS eliminates that risk. Its advanced BMS provides real-time voltage, current, and temperature monitoring designed to integrate with your hybrid inverter, not fight it. At Off Grid Vault, every component we carry is vetted for real-world compatibility with off-grid architectures. No mix-and-match guesswork, no crossed wires, no silent failures. This module is built to slot into a system that actually works — whether you're stacking two modules for a cabin or sixteen for a homestead.

Start Small, Scale to 80kWh Without Replacing Hardware

Start Small, Scale to 80kWh Without Replacing Hardware

One 5.12kWh module covers essential backup loads — lights, communications, a refrigerator. But real energy independence means thinking ahead. The ETHOS architecture supports up to 16 parallel connections per Control Box, taking you from 5.12kWh to 80kWh on the same platform. No swapping batteries, no rewiring your bus bars, no starting over. Add modules as your consumption grows — a new well pump, a workshop, an addition to the cabin. Tier 1 LiFePO4 cells deliver consistent performance across every module in the stack, so your bank ages uniformly. This is how you build a battery system that grows with your homestead instead of outgrowing your investment.

IP65 Protection and Integrated Fire Suppression

IP65 Protection and Integrated Fire Suppression

Off-grid batteries live in garages, sheds, and utility rooms — not climate-controlled data centers. The ETHOS module is enclosed in an IP65-rated casing that seals out dust, water jets, and humidity. Built-in fire-extinguishing modules add a layer of protection that most LiFePO4 batteries in this class simply don't offer. UL-certified connectors ensure your power connections stay secure under thermal cycling and vibration. Operating discharge range is 59°F to 95°F, with storage tolerance down to -4°F at above 50% state of charge. This is a battery built to survive the conditions real off-grid installations actually face — not just the conditions on a spec sheet.

Compatibility Check

Verify your system meets these requirements before ordering.

  • 48V system architecture required
  • ETHOS Control Box needed for stackable expansion
  • Operating environment within 59°F – 95°F discharge range

Where This Battery Fits

From daily solar storage to emergency backup, the ETHOS module adapts to your power scenario.

Off-Grid Homesteads
Solar Energy Systems
Commercial Installations
Emergency Backup Power

Full specifications

At a glance

Dimensions
See product page
Power
48V
Full specifications11 data points across 4 categories

Dimensions

DimensionsSee product page

Power & Performance

System Voltage48V
Nominal Voltage51.2V
kWh Capacity5.1
Max Expansion80kWh per Control Box
Optimal Discharge Temperature Range59°F - 95°F (15°C - 35°C)
Storage Temperature Range (SoC >50%)-4°F - 113°F (-20°C - 45°C) (Max 6 months)

Materials

ChemistryLiFePO4
Casing RatingIP65

Compliance & Warranty

ConnectorsUL-certified
Safety FeaturesBuilt-in fire-extinguishing modules

The Off Grid Vault Promise

We stand behind every product we sell — with real support, not just a receipt.

Free ShippingShips free on all orders, including LTL freight on large systems. No thresholds, no fine print.
Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right. Uninstalled returns accepted in original packaging.
★★★★★
“I started with two ETHOS modules for my 800 sq ft cabin in northern Arizona. Running lights, a mini fridge, laptop, and well pump — no issues. The BMS monitoring is solid and the IP65 casing gives me peace of mind since my battery bank lives in an unheated shed. Already planning to add two more modules this spring.”
F
First L.Flagstaff, AZ

Welcome to the forefront of energy storage innovation with the BigBattery 48V ETHOS systems. These 5.12kWh battery modules form the backbone of adaptable power solutions suitable for a wide range of applications, including grid-tied residences, solar installations, remote off-grid locations, and commercial establishments across the country. Featuring Tier 1 LiFePO4 cells, renowned for their safety and durability, and offering scalability up to 80kWh per Control Box, the ETHOS system sets a new standard for dependable energy storage solutions.

  • Scalable Power: 5.12kWh modules, expandable up to 80kWh per ETHOS Control Box.
  • Safety First: Tier 1 LiFePO4 cells and built-in fire-extinguishing modules ensure maximum safety.
  • Smart Monitoring: Advanced BMS technology provides real-time monitoring of voltage, current, and temperature.
  • Reliable Connectivity: UL-certified connectors ensure secure and reliable power connections.
  • Durable Design: IP65-rated casing protects against the elements for long-lasting reliability.
  • Versatile Applications: Ideal for emergency backup or as part of a solar energy system.

SKU: FETHS-48051-G1

System Voltage: 48V
Nominal Voltage: 51.2V
Chemistry: LiFePO4
kWh Capacity: 5.12kWh
Ah Capacity: 100Ah
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
Max Continuous Discharge Current: 100A
Max Continuous Power: 5120W
Max Discharge Peak Current: 150A (Max 5 seconds)
Max Charge Current: 100A
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)
Depth: 6.7 in (170 mm)
Width: 26.5 in (674 mm)
Height: 16.5 in (419 mm)
Max Connections: Up to (16) parallel connections per control box
Protection Rating: IP65
Communications: CANBus / RS485
Certifications: UL9540a, UL1973, & UN38.3

Designed For:

  • 48V Applications
  • Residential Power Systems
  • Home Solar Systems
  • UL-Certified ESS
  • Cabins & Tiny Homes
  • Family Homes & Mansions
  • Off-Grid Homesteads
  • Emergency Power
  • Whole Home Backup
  • Lead Acid Replacement
  • Intense Heat & Cold

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Frequently Asked Questions

If you're paying $250/month to the utility, every kWh you self-supply is money you stop sending to the power company. One 5.12kWh ETHOS module stores enough to offset a meaningful portion of daily consumption — and unlike a grid-tied system that goes dark during outages, this battery keeps working when the grid fails. Over a 10-year LiFePO4 lifespan, the cost per stored kWh drops well below utility rates. This isn't an expense — it's a long-term asset that pays dividends every month the sun shines and every time the grid goes down.
Off Grid Vault is an authorized dealer for every brand we carry. When you purchase the ETHOS 5.12kWh module from us, your warranty is backed by the manufacturer — and we handle claims on your behalf. No ticket queues, no being redirected to a generic marketplace seller who disappears after the offer. You get a direct line to people who understand off-grid battery systems, not just order fulfillment. That's the difference between buying from a specialist and buying a box from a listing.
The ETHOS module operates at 48V nominal (51.2V) using LiFePO4 chemistry — the most widely supported voltage and chemistry in off-grid hybrid inverters. However, compatibility depends on your specific inverter's communication protocol and charge parameters. That's why Off Grid Vault offers a free system design consultation with every purchase or pre-purchase inquiry. Tell us your inverter model, charge controller, and daily consumption, and our engineers will confirm whether the ETHOS integrates cleanly — or recommend the exact configuration that does.
LiFePO4 is the gold standard for off-grid energy storage. Tier 1 cells like those in the ETHOS module typically deliver 3,000–6,000 cycles at 80% depth of discharge before reaching 80% of original capacity. In real-world terms, that translates to 10+ years of daily cycling in a properly configured system. Compare that to AGM batteries at 500–1,500 cycles or standard lithium-ion at 1,000–2,000 cycles. LiFePO4 also maintains stable voltage through the discharge curve, meaning your inverter sees consistent input rather than voltage sag under load.
Off Grid Vault ships free on all orders, including LTL freight for heavy battery modules. Lead times vary based on current stock levels. Contact us before ordering if you need a confirmed ship date for a time-sensitive installation. We'd rather give you an honest timeline than promise a date we can't hit. For pre-purchase system design consultations, our engineers typically respond within one business day.
Yes. The ETHOS system requires a Control Box to manage parallel connections beyond a single module. Each Control Box supports up to 16 modules (80kWh total). If you're planning to start with one module and expand later, you can add the Control Box when you're ready to stack. For system design help — including determining the right number of modules and Control Box configuration for your daily kWh consumption — reach out for our free consultation. We'll spec the exact setup for your load profile.
SKU: 1622028 Category: Brand:

The Off Grid Vault Promise

We stand behind every product we sell — with real support, not just a receipt.

Free Shipping Ships free on all orders, including LTL freight on large systems. No thresholds, no fine print.
Free System Design Consultation Our engineers size your system for your actual consumption — no guesswork, no incompatible components.
30-Day Performance Guarantee If it doesn't perform as specified, we make it right. Uninstalled returns accepted in original packaging.

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About bigbattery Battery

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