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bigbattery|SKU:BNDL-B0009

BigBattery 48V ETHOS 30.7kWH — Six-Module LiFePO4 Battery Bank

30.7kWh Grid-Independent Energy Storage

30.7kWh total capacity — Six stackable 5.12kWh LiFePO4 modules
200A continuous discharge — Powers heavy loads without hesitation
IP65 weatherproof enclosure — Built to handle harsh conditions
Expandable to 80kWh — Scale your system as needs grow
Built-in fire suppression — Safety engineered into every module
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- Ships free including LTL freight delivery
  • Compatibility Guarantee -- Pre-vetted components that work together

$9,846.95

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BigBattery 48V ETHOS 30.7KWH (6 Module)
BigBattery 48V ETHOS 30.7KWH (6 Module)
$9,846.95

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4.9/5 Stars 2,400+ verified reviews.

In the box

  • 1 × ETHOS Control Box
  • 6 × 48V ETHOS 5.12kWh Stackable Battery Module
BigBattery 48V ETHOS 30.7KWH (6 Module)
BigBattery 48V ETHOS 30.7kWH — Six-Module LiFePO4 Battery Bank
$9,846.95

30.7kWh Grid-Independent Energy Storage

The BigBattery 48V ETHOS 30.7kWH system delivers serious off-grid power using six 5.12kWh stackable LiFePO4 modules and a dedicated ETHOS Control Box. Tier 1 cells, an IP65 weatherproof enclosure, and built-in fire-extinguishing modules make this a built-to-survive bank for homes, cabins, and commercial sites. Scalable up to 80kWh per control box, the ETHOS adapts as your demand grows. Advanced BMS provides real-time voltage, current, and temperature monitoring through UL-certified connectors. Whether you're running a remote homestead or backing up a grid-tied residence, this field-tested system keeps you powered without compromise.

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
IP65 Weatherproof Casing
200A Continuous Discharge
Expandable to 80kWh
30.7 kWh
Total System Capacity
51.2V
Nominal Voltage
10240W
Max Continuous Power
No More Blackouts — Storage That Actually Delivers

No More Blackouts — Storage That Actually Delivers

Grid-tied systems marketed as energy independence go dark the moment the utility fails. That defeats the entire point. The ETHOS 30.7kWH battery bank stores 30.7kWh of usable energy from your solar array, keeping your home powered through extended outages without grid dependency. Off Grid Vault pre-vets every system for component compatibility — the ETHOS Control Box communicates directly with each 5.12kWh module, so your inverter sees a single, stable 51.2V battery bank. No mix-and-match guesswork, no mismatched BMS protocols. This is the off-grid proven storage backbone that makes the utility company irrelevant, sized and specced by people who would install it on their own homestead.

Tier 1 LiFePO4 Cells — A Decade of Reliable Cycles

Tier 1 LiFePO4 Cells — A Decade of Reliable Cycles

LiFePO4 chemistry delivers significantly longer cycle life than standard lithium-ion or AGM, maintaining over 80% capacity after thousands of charge cycles. The ETHOS modules use Tier 1 grade-A cells with a 16S 2P configuration, rated for a 200A continuous discharge and 300A peak surge for up to five seconds — enough to start well pumps, compressors, and other motor-driven loads. The built-in BMS monitors voltage, current, and cell temperature in real time, with a suggested low voltage cutoff between 48V and 50.8V to protect cell health. This is field-tested chemistry for off-grid proven installations where battery replacement every few years is not an option.

IP65 Protection With Built-In Fire Suppression

IP65 Protection With Built-In Fire Suppression

The IP65-rated enclosure shields every ETHOS module from dust and water ingress, making this battery bank suitable for garages, utility sheds, and covered outdoor installations. Built-in fire-extinguishing modules add a layer of protection that most wall-mount battery systems lack — a critical detail when your battery bank sits unattended in a remote cabin or outbuilding. UL-certified connectors ensure secure power connections between each module and the Control Box, eliminating the loose-terminal failures common in DIY battery builds. This is built-to-survive hardware designed for locations where the nearest fire department is thirty minutes away, not thirty seconds.

Installation Compatibility

Confirm your setup meets these requirements before ordering.

  • 48V inverter or hybrid inverter with LiFePO4 battery profile support
  • Wall or floor mounting surface rated for stacked battery module weight
  • Indoor or sheltered installation within IP65 enclosure environmental limits

Built For Real Scenarios

Where the ETHOS 30.7kWH system performs.

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

Full specifications

At a glance

Dimensions
See product page
Power
51.2V
Full specifications17 data points across 4 categories

Dimensions

DimensionsSee product page

Power & Performance

Nominal Voltage51.2V
kWh Capacity10.24kWh
Ah Capacity200Ah
Charging Voltage Range55.6 - 57V
Operating Voltage Range48 – 57V
Suggested Low Voltage Cutoff48 – 50.8V
Cell Configuration16S 2P
Max Continuous Discharge Current200A
Max Continuous Power10240W
Max Discharge Peak Current300A (Max 5 seconds)

Materials

ChemistryLiFePO4
Casing RatingIP65

Compliance & Warranty

ConnectorsUL-certified
Safety FeatureBuilt-in fire-extinguishing modules
Cell GradeTier 1 LiFePO4
SKUBNDL-B0009

The Off Grid Vault Promise

What you get when you buy from us — not just a product.

30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right. Uninstalled returns accepted within 30 days in original packaging.
Free ShippingShips free via LTL freight — threshold delivery included on all orders, no surprise charges.
Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
★★★★★
“Running 30.7kWh off a single ETHOS Control Box with six modules stacked in my shop. Paired it with a 48V hybrid inverter and it handles my well pump, fridge, and shop tools without dipping below 48V. The built-in fire suppression sealed the deal for me — my last battery build had no thermal protection at all. Off Grid Vault confirmed my inverter compatibility before I ordered. This is the real-deal storage I spent a year researching.”
F
First L.Prescott, AZ

Welcome to the forefront of energy storage innovation with the BigBattery 48V ETHOS systems. These 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 – single stack, 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:

  • 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

BigBattery 48V ETHOS 30.7KWH (6 Module) Includes:

  • 1 √ó ETHOS Control Box
  • 6 √ó 48V ETHOS 5.12kWh Stackable Battery Module
 

Single Stack Specs

SKU:
BNDL-B0009
System Voltage:
 
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 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)
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
Communications: CANBus / RS485
Certifications: UL9540, UL9540a, UL1973, & UN38.3

 

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Frequently Asked Questions

At $9,847, the ETHOS 30.7kWH system stores enough energy to offset significant monthly utility costs. If your home draws 25 kWh per day, this bank covers more than a full day of autonomous operation. Over a 10-year LiFePO4 lifespan, that is real money kept from the utility company. This is not a discretionary purchase — it is a calculated investment in energy independence with a measurable return. Finance with Affirm and pay as low as $821 per month on approved credit.
Yes. Off Grid Vault is an authorized dealer, which means warranty claims go through us — not through a ticket queue with an unknown third party. You get direct access to our team for troubleshooting, compatibility questions, and warranty support. We stand behind every product we sell with a 30-day performance guarantee for uninstalled returns. When you invest nearly $10,000 in a battery bank, you deserve a seller with real accountability, not a marketplace listing that disappears after checkout.
The ETHOS system operates at a nominal 51.2V with a charging range of 55.6V to 57V and an operating range of 48V to 57V. Most 48V hybrid inverters from major brands are compatible, but voltage parameters and charge profiles must match. That is exactly why Off Grid Vault includes a free system design consultation with every purchase. Tell us your inverter model, daily kWh consumption, and solar input, and our engineers will confirm compatibility before you buy. No guesswork, no mismatched components.
LiFePO4 chemistry is the standard for serious off-grid storage because it maintains over 80% capacity for thousands of cycles — far outperforming lithium-ion and AGM alternatives. The ETHOS modules use Tier 1 cells with an advanced BMS that actively monitors voltage, current, and temperature to prevent damage from overcharge, over-discharge, and thermal events. With proper charge settings within the 55.6V to 57V range and respect for the suggested low voltage cutoff, these modules are built for the long haul in off-grid proven applications.
Yes. Each ETHOS Control Box supports up to 80kWh of stacked modules. Starting with six 5.12kWh modules gives you 30.7kWh, and you can add more modules as your load increases — whether that means adding a well pump, a workshop, or expanding your cabin. This modular approach means you invest in the capacity you need today without paying for storage you will not use for years. The Control Box manages communication across all connected modules, so expansion is straightforward without reconfiguring your entire system architecture.
As an authorized dealer, Off Grid Vault handles warranty claims directly. The manufacturer warranty covers defects in cells and BMS components, and we process those claims on your behalf — you deal with our team, not a faceless support queue. For the 30-day window, uninstalled systems in original packaging qualify for our performance guarantee return. After installation, the built-in BMS provides real-time diagnostics so you can identify and isolate any underperforming module without taking the entire bank offline. That is the advantage of a modular, monitored system.
SKU: BNDL-B0009 Category: Brand:

The Off Grid Vault Promise

What you get when you buy from us — not just a product.

30-Day Performance Guarantee If it doesn't perform as specified, we make it right. Uninstalled returns accepted within 30 days in original packaging.
Free Shipping Ships free via LTL freight — threshold delivery included on all orders, no surprise charges.
Free System Design Consultation Our engineers size your system for your actual consumption — no guesswork, no incompatible components.

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