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EcoFlow DELTA Pro Ultra X Battery — 6kWh LFP Storage, Scalable to 90kWh

6kWh of Field-Tested Storage Per Unit

6kWh per unit — Reliable LFP storage for daily use
Scale to 90kWh — Expand per inverter as needs grow
LiFePO4 chemistry — Thousands of cycles, years of service
Stackable modular build — Compact footprint at 26 × 18 × 8 in
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- All orders ship free, including LTL freight
  • Compatibility Guarantee -- Pre-vetted to work within the DELTA Pro Ultra ecosystem

$1,930.95

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Ecoflow DELTA Pro Ultra X Battery
Ecoflow DELTA Pro Ultra X Battery
$1,930.95

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In the box

  • EcoFlow DELTA Pro Ultra X Battery (6kWh)
Ecoflow DELTA Pro Ultra X Battery
EcoFlow DELTA Pro Ultra X Battery — 6kWh LFP Storage, Scalable to 90kWh
$1,930.95

6kWh of Field-Tested Storage Per Unit

The EcoFlow DELTA Pro Ultra X Battery delivers 6kWh of LFP storage in a stackable, modular form built for off-grid and grid-independent setups. Scale from a single unit up to 90kWh per inverter to match your actual daily consumption — no guessing, no wasted capacity. LiFePO4 chemistry provides thousands of charge cycles, and the operating range of −4°F to 113°F keeps it running through real winter and summer conditions. This is field-tested energy storage that grows with your homestead, cabin, or whole-home backup system.

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
6kWh Per Unit
LFP Chemistry
Stackable Design
90kWh Expandable
6kWh
Storage Per Unit
90kWh
Max Per Inverter
111.3 lbs
Unit Weight
Grid-Independent Storage That Never Leaves You Dark

Grid-Independent Storage That Never Leaves You Dark

Unlike grid-tied systems that shut down the moment the utility fails, the DELTA Pro Ultra X Battery keeps your home running with no grid dependency. This is off-grid proven LFP storage that delivers 6kWh per unit and scales to 90kWh per inverter — enough for whole-home backup across multiple days of autonomy. At Off Grid Vault, every component we carry is pre-vetted for compatibility with your system architecture, so you are never left guessing whether your battery will actually communicate with your inverter. Stack multiple units for serious energy independence, and know that every piece in your setup was chosen by people who would install it on their own cabin.

LiFePO4 Chemistry Built for a Decade of Daily Cycles

LiFePO4 Chemistry Built for a Decade of Daily Cycles

The DELTA Pro Ultra X Battery uses lithium iron phosphate chemistry — the same chemistry serious off-grid builders demand because it tolerates thousands of charge cycles while retaining capacity far longer than standard lithium-ion. Rated for operation from −4°F to 113°F, this battery handles the temperature swings that come with cabin living, homestead builds, and unconditioned utility rooms. At 111.3 lbs in a 26 × 18 × 8 in stackable form factor, it delivers substantial energy density without wasting floor space. This is field-tested storage designed for daily deep cycles, not occasional backup use.

Scale Your System Without Starting Over

Scale Your System Without Starting Over

Start with one 6kWh unit for essential circuit backup, then add modules as your consumption grows — up to 90kWh on a single DELTA Pro Ultra inverter, and even further across multiple systems. The modular architecture means you invest in storage incrementally instead of overbuying upfront or being forced to replace your battery bank when your needs change. Integration with the DELTA Pro Ultra inverter supports solar charging, grid charging, and generator input through one managed system. Off Grid Vault includes a free system design consultation with every purchase, so your expansion path is planned from day one — no incompatible components, no wasted money.

Compatibility Check

Confirm this battery integrates with your existing DELTA Pro Ultra inverter before ordering.

  • Compatible with DELTA Pro Ultra inverter only
  • Installation area accommodates 26 × 18 × 8 in per unit
  • Operating environment stays within −4°F to 113°F

Built For Real-World Use

Where this battery earns its place in your energy system.

Whole-Home Backup
Off-Grid Homestead
RV Power Systems
High-Demand Energy Storage

Full specifications

At a glance

Dimensions
26 × 18 × 8 in
Warranty
See product page
Full specifications8 data points across 4 categories

Dimensions

Battery Dimensions26 × 18 × 8 in
Battery Weight111.3 lbs

Power & Performance

Storage Capacity6kWh
Max ExpansionUp to 90kWh per inverter
Battery ChemistryLFP
Battery Temperature−4°F to 113°F

Materials

Battery ChemistrySee product page

Compliance & Warranty

WarrantySee product page

The Off Grid Vault Promise

What you get when you buy from people who actually build off-grid systems.

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 on every order, including LTL freight on large systems. No thresholds, no surprise charges at checkout.
Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
★★★★★
“Started with one DELTA Pro Ultra X for backup after a four-day outage cost us a freezer full of meat. Added a second unit three months later when we put in solar panels. The system just works — no compatibility headaches, no guesswork. Off Grid Vault sized it right from the start.”
F
First L.Prescott, AZ

DELTA Pro Ultra X Smart Extra Battery

The EcoFlow DELTA Pro Ultra X Battery is a high-capacity, modular energy storage solution designed to power everything from essential home circuits to full off-grid systems with reliable, scalable performance. Built as part of the EcoFlow ecosystem, this advanced battery delivers 6kWh of storage per unit and can be expanded up to an impressive 90kWh per inverter—or even larger when paired across multiple systems—making it ideal for homeowners, backup power users, and energy independence setups. Its lithium iron phosphate (LiFePO4) chemistry provides long-lasting durability with thousands of charge cycles, ensuring dependable performance for years of daily use.

Engineered for flexibility, the EcoFlow DELTA Pro Ultra X Battery integrates seamlessly with the DELTA Pro Ultra inverter to create a fully customizable energy system that grows with your needs. It supports solar charging, grid charging, and generator input when connected through the system, giving users multiple ways to stay powered in any situation. With a compact, stackable design and advanced battery management system for safety and efficiency, this EcoFlow battery is perfect for whole-home backup, off-grid living, RV setups, and high-demand energy storage applications where reliability and scalability matter most.


Includes: Delta Pro Ultra X extra Battery, Battery Connection Cable, User Manual & Warranty Card

DELTA Pro Ultra X Whole-Home Backup Power

EcoFlow DELTA Pro Ultra X Battery Specs & Features

  • Battery Weight: 111.3 lbs
  • Battery Dimensions: 26 × 18 × 8 in
  • Battery Chemistry: LFP
  • Battery Temperature: −4°F to 113°F
  • Expandable Energy Storage
  • Long-Lasting Performance
  • Smart, Safe, Reliable
  • Effortless Integration
  • Scalable Design


Your Satisfaction with EcoFlow is Guaranteed:

  • 5-Year Limited Warranty
  • Lowest Price Guarantee

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Frequently Asked Questions

At an average utility rate of $250 per month, a single 6kWh DELTA Pro Ultra X Battery covering essential circuits starts paying for itself in under seven months of avoided outage losses — spoiled food, hotel stays, and emergency fuel. When paired with solar, each additional battery reduces your grid dependence further. The real comparison is not battery versus grid; it is planned energy independence versus reactive spending every time the power goes out.
Buying a 6kWh LFP battery from a generic marketplace means no system design support, no compatibility verification, and no off-grid expertise if something does not work as expected. Off Grid Vault is an authorized dealer, and we provide a free system design consultation with every purchase to confirm this battery integrates correctly with your inverter and charge configuration. If a warranty claim arises, it goes through us — not a ticket queue.
Yes. The DELTA Pro Ultra X Battery is purpose-built for the DELTA Pro Ultra inverter ecosystem. It connects directly and communicates through the system's battery management protocol. If you are building a new system or expanding an existing one, take advantage of our free system design consultation — tell us your daily kWh consumption and panel array, and we will confirm the exact battery count and configuration for your setup.
The LiFePO4 chemistry in the DELTA Pro Ultra X Battery is rated for thousands of charge cycles while maintaining strong capacity retention — significantly outperforming standard lithium-ion in both cycle life and thermal stability. It operates reliably from −4°F to 113°F, covering the temperature range most off-grid installations encounter. For specific cycle life ratings and warranty terms tied to this model, refer to the manufacturer documentation included with your order, or contact us and we will provide the exact specifications.
The modular design is built exactly for this approach. Start with a single 6kWh unit to cover essential circuits, then add batteries as your load or solar array grows. You can scale up to 90kWh per DELTA Pro Ultra inverter without replacing any existing hardware. Our free system design consultation helps you plan that expansion path from the start, so every battery you add later integrates seamlessly with what you already have installed.
That depends on your actual daily consumption. A typical home running a refrigerator, lights, well pump, and communications uses 15–25 kWh per day. One 6kWh battery covers essential circuits for several hours; two to four units provide one to two days of autonomy depending on load management. With solar charging during the day, even a modest battery bank can sustain indefinite off-grid operation. Contact us for a free system design consultation — we will calculate the exact battery count for your specific kWh consumption and outage duration goals.
SKU: EFDELTAPROUXEB Category: Brand:

The Off Grid Vault Promise

What you get when you buy from people who actually build off-grid systems.

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 on every order, including LTL freight on large systems. No thresholds, no surprise charges at checkout.
Free System Design Consultation Our engineers size your system for your actual consumption — no guesswork, no incompatible components.

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About ecoflow Heat Pump Condensers

ecoflow is a trusted manufacturer of premium heat pump condensers. OffGridVault is an authorized dealer offering the full ecoflow lineup with free delivery, price match guarantee, and expert support.

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