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bigbattery|SKU:BNDL-B0007

BigBattery 48V ETHOS 15.3kWh: Three-Module LiFePO4 Bank

15.3kWh LiFePO4 Battery Bank Built for Serious Off-Grid Power

15.3kWh LiFePO4 storage — Tier 1 cells built for years of daily cycling
Scale to 80kWh total — Expand per Control Box as your demand grows
IP65 weatherproof casing — Sealed enclosure shields against dust and water
Built-in fire suppression — Integrated extinguishing modules for maximum safety
Real-time BMS monitoring — Track voltage, current, and temperature continuously
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- LTL freight included — no surprise freight charges
  • Compatibility Guarantee -- Components pre-vetted to work together out of the box

$5,089.95

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BigBattery 48V ETHOS 15.3KWH (3 Module)
BigBattery 48V ETHOS 15.3KWH (3 Module)
$5,089.95

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In the box

  • 1× ETHOS Control Box
  • 3× 48V ETHOS 5.12kWh Stackable Battery Module
  • 1× 15kWh Ethos Controller to Battery Power Cable 4ft (1220mm)
BigBattery 48V ETHOS 15.3KWH (3 Module)
BigBattery 48V ETHOS 15.3kWh: Three-Module LiFePO4 Bank
$5,089.95

15.3kWh LiFePO4 Battery Bank Built for Serious Off-Grid Power

The BigBattery 48V ETHOS 15.3kWh system delivers three 5.12kWh LiFePO4 modules controlled by a single ETHOS Control Box — field-tested for off-grid homesteads, solar backup installations, and grid-independent residences. Tier 1 LiFePO4 cells with built-in fire-extinguishing modules and an IP65 weatherproof casing mean this battery bank is built-to-survive real-world conditions. Scale up to 80kWh per control box as your energy demands grow. Ships free.

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
Tier 1 LiFePO4 Cells
Expandable to 80kWh
Built-In Fire Suppression
IP65 Weatherproof Casing
15.3kWh
Total Storage Capacity
48V
System Voltage
80kWh
Max Expansion Per Box
Grid-Independent Storage That Never Leaves You Dark

Grid-Independent Storage That Never Leaves You Dark

Unlike grid-tied battery systems that shut down the moment the utility fails, the BigBattery ETHOS 15.3kWh bank is built for true off-grid proven operation. Three Tier 1 LiFePO4 modules deliver 15.3kWh of usable capacity through a single Control Box — no mix-and-match guesswork, no incompatible BMS protocols. Every component in this bundle is pre-vetted to communicate seamlessly, so your inverter sees the battery bank exactly as it should. When you buy from Off Grid Vault, we already confirmed the architecture works together. You don't need to be an engineer — because we did that work. This is the battery bank that keeps your homestead running through multi-day outages without hesitation.

Tier 1 LiFePO4 Cells With 80kWh Expansion Path

Tier 1 LiFePO4 Cells With 80kWh Expansion Path

The ETHOS system uses Tier 1 LiFePO4 cells — the chemistry serious off-grid builders demand over standard lithium-ion. These cells deliver consistent capacity across thousands of cycles. Starting at 15.3kWh with three 5.12kWh stackable modules, you can scale up to 80kWh per Control Box as your homestead grows. The advanced BMS provides real-time monitoring of voltage, current, and temperature, so you always know your state of charge. UL-certified connectors ensure every power connection stays secure under continuous load. This is not a starter battery you outgrow in a year — it is the foundation of a grid-independent power system built to expand on your terms.

IP65-Rated Protection With Integrated Fire Suppression

IP65-Rated Protection With Integrated Fire Suppression

Off-grid battery banks live in garages, sheds, and utility rooms — not climate-controlled data centers. The ETHOS modules feature an IP65-rated casing that seals out dust and water ingress, delivering battle-tested durability in environments where standard enclosures fail. Built-in fire-extinguishing modules add a layer of safety that most battery banks in this class simply do not offer. If thermal events occur, the system is designed to self-suppress before damage spreads. Combined with the advanced BMS temperature monitoring, the ETHOS bank protects not just your power supply but your property. This is the level of engineering that separates a wall-mount battery from something you actually trust in your home.

Is This Battery Right for Your Setup?

This system is designed for 48V architectures. Confirm compatibility before ordering — our engineers can help.

  • Your inverter and charge controller support 48V LiFePO4 battery banks
  • Your daily energy consumption falls within 5–15kWh (expandable to 80kWh)
  • Installation location accommodates wall-mounted control box plus stacked modules

Where This Battery Bank Performs

Three 5.12kWh modules give you flexible deployment across residential, commercial, and remote power scenarios.

Whole-Home Off-Grid Solar
Grid-Tied Backup Power
Remote Cabin & Homestead
Commercial Energy Storage

Full specifications

At a glance

Power
48V
Dimensions
See product page
Compliance
UL-certified
Warranty
See product page
Full specifications14 data points across 4 categories

Power & Performance

ChemistryTier 1 LiFePO4
System Voltage48V
Module Capacity5.12kWh
Total Capacity (3 Modules)15.3kWh
Max ExpansionUp to 80kWh per Control Box
BMSAdvanced BMS with real-time monitoring of voltage, current, and temperature

Materials

Casing RatingIP65-rated
ConnectorsUL-certified
Fire ProtectionBuilt-in fire-extinguishing modules

Dimensions

Module DimensionsSee product page
Control Box DimensionsSee product page
WeightSee product page

Compliance & Warranty

Connector CertificationUL-certified
WarrantySee product page

The Off Grid Vault Promise

We stand behind every product we sell — with real support, real guarantees, and real expertise.

Free ShippingShips free via LTL freight. No minimums, no surprise charges at checkout.
30-Day Performance GuaranteeUninstalled, in original packaging — if it doesn't perform as specified, we make it right.
Free System Design ConsultationOur engineers size your system for your actual consumption. No guesswork, no incompatible components.
★★★★★
“I've been running this bank for four months on my 1,800 sq ft homestead. Paired with my 48V hybrid inverter and 8kW of solar, I am fully off-grid. The BMS monitoring is accurate — my state of charge matches my shunt reading within 1%. The IP65 casing gives me confidence mounting it in my unconditioned shed. No regrets.”
F
First L.Prescott, AZ

Welcome to the forefront of energy storage innovation with the BigBattery 48V ETHOS systems. These 5.12kWh battery modules (15.3kWh – 3 module) 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.

Designed for:

  • 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

BigBattery 48V ETHOS 15.3KWH (3 Module) Includes: 

  • 1 √ó ETHOS Control Box
  • 3 √ó 48V ETHOS 5.12kWh Stackable Battery Module
  • 1 √ó 15kWh Ethos Controller to Battery Power Cable 4ft (1220mm)

3 Stack Specs: 

 SKU:  BNDL-B0007
 System Voltage:  48V
 Nominal Voltage:  51.2V
 Chemistry:  LiFePO4
 kWh Capacity:  15.36kWh
 Ah Capacity:  300Ah
 Charging Voltage Range:  55.6 Р57V
 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 Р113°F (0°C Р45°C)
 Discharge Temperature Range:  -4°F Р140°F (-20°C Р60°C)
 Optimal Discharge Temperature Range:  59°F Р95°F (15°C Р35°C)
 Storage Temperature Range (SoC >50%):  -4°F Р113°F (-20°C Р45°C) (Max 6 months)
 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

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Frequently Asked Questions

If you are currently paying $250–$400/month to the utility, a 15.3kWh bank is the core of a system that eliminates that bill entirely. At $300/month, the battery portion pays back in roughly 14 years — but paired with solar panels and a hybrid inverter, your full system payback drops to 4–7 years. After that, every dollar that would have gone to the power company stays in your pocket. This is not an expense — it is a transfer of wealth from your utility to your property value.
BigBattery is an established manufacturer in the LiFePO4 storage space, producing systems for residential, commercial, and off-grid installations across the country. Off Grid Vault carries only brands with verifiable track records and real warranty support. We are an authorized dealer, which means your warranty claims go through us — not through a ticket queue on a marketplace. If something fails, you deal with a real person who understands off-grid systems, not a returns bot.
The ETHOS 48V system is designed to integrate with standard 48V hybrid and off-grid inverters. However, compatibility depends on your specific inverter's communication protocol and voltage window. That is exactly why Off Grid Vault offers a free system design consultation. Tell us your inverter model, daily kWh consumption, and setup — our team will confirm whether this bank integrates cleanly or recommend the exact configuration that does. No guesswork, no mismatched components.
This bundle includes the ETHOS Control Box, three 5.12kWh stackable battery modules, and the controller-to-battery power cable. To have a functioning power system, you will also need a compatible 48V inverter/charger, solar panels, and a charge controller. If you are starting from scratch, contact us for a free system design consultation — we will spec the complete package so every component works together from day one.
The ETHOS system uses Tier 1 LiFePO4 cells, which are the industry standard for long-cycle-life stationary storage. LiFePO4 chemistry significantly outlasts standard lithium-ion and AGM in daily cycling applications. Combined with the advanced BMS that monitors voltage, current, and temperature in real time, the cells are protected from the conditions that degrade lesser batteries. The IP65-rated casing and built-in fire-extinguishing modules add physical protection that further extends service life. Check the manufacturer warranty for specific cycle-life guarantees.
The ETHOS system has built-in fire-extinguishing modules designed to self-suppress before damage spreads — a safety feature most battery banks in this class do not include. The advanced BMS continuously monitors individual cell voltage, current, and temperature, flagging anomalies before they become failures. UL-certified connectors ensure power connections remain secure under load. This is layered, active protection — not just a fuse. For warranty claims on any cell or module issue, we handle it directly as your authorized dealer.
SKU: BNDL-B0007 Category: Brand:

The Off Grid Vault Promise

We stand behind every product we sell — with real support, real guarantees, and real expertise.

Free Shipping Ships free via LTL freight. No minimums, no surprise charges at checkout.
30-Day Performance Guarantee Uninstalled, in original packaging — if it doesn't perform as specified, we make it right.
Free System Design Consultation Our engineers size your system for your actual consumption. No guesswork, no incompatible components.

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