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EcoFlow DELTA Pro Ultra X: 12kW Whole-Home Backup With 12.288kWh LFP Storage

12kW Whole-Home Backup Power That Scales With You

Seamless sub-20ms transfer — Your lights stay on during grid failures
12kW continuous output — Run HVAC, well pumps, and full 240V loads
Expandable to 180kWh — Add batteries without tools as needs grow
10kW solar input ready — Charge from panels and stay grid-independent
EV-grade LFP cells — Lower resistance, less heat, longer lifespan
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption — no guesswork
  • FREE Shipping -- Ships free — including LTL freight on large systems
  • Compatibility Guarantee -- Components pre-vetted to work together — we stand behind the architecture

Price range: $7,022.95 through $15,449.95

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EcoFlow DELTA Pro Ultra X Whole-Home Backup Power
EcoFlow DELTA Pro Ultra X Whole-Home Backup Power
$7,022.95 $15,449.95Price range: $7,022.95 through $15,449.95

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In the box

  • 1 x DELTA Pro Ultra X Inverter
  • 2 x LFP Batteries (12.288kWh total)
EcoFlow DELTA Pro Ultra X Whole-Home Backup Power
EcoFlow DELTA Pro Ultra X: 12kW Whole-Home Backup With 12.288kWh LFP Storage
$7,022.95 $15,449.95Price range: $7,022.95 through $15,449.95

12kW Whole-Home Backup Power That Scales With You

The DELTA Pro Ultra X delivers 12kW of continuous 120V/240V output — enough to run HVAC, well pumps, and every essential circuit during a grid outage. With 12.288kWh of LFP storage and expansion up to 180kWh, this off-grid proven system adapts to your actual energy needs. The automatic transfer switch activates in under 20 milliseconds, and the field-tested design handles surge loads up to 45kW. Solar-rated with up to 10kW PV input, it keeps your home grid-independent through extended blackouts.

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
12kW / 120V–240V Output
LFP Battery Chemistry
Extreme Weather Protection
20ms Transfer Switch
12.288kWh
Standard Capacity
180kWh
Maximum Expansion
10kW
Solar Input
Zero-Downtime Transfer Eliminates Grid-Tied Vulnerability

Zero-Downtime Transfer Eliminates Grid-Tied Vulnerability

Grid-tied solar systems marketed as energy independence go completely dark the moment the utility fails. The DELTA Pro Ultra X is the opposite — a standalone, off-grid unit that transfers your entire home to battery power in under 20ms. At Off Grid Vault, we pre-vet every configuration for component compatibility, so the inverter, batteries, and Smart Home Panel communicate flawlessly. No wall mounting required, no complex permitting like grid-tied installs. This is a system sized and verified to actually run your home when the grid disappears.

LFP Storage Built for Real-World Conditions

LFP Storage Built for Real-World Conditions

EV-grade full-tab LFP cells deliver 25% lower resistance than standard cells — 1.5 mΩ vs. 2 mΩ — meaning less self-heating and longer cycle life. The system charges safely down to −4°F and operates up to 113°F, with active battery heating in extreme cold. Dual BMS protection runs 44+ local safeguards plus 100+ cloud-based anomaly detectors around the clock. This isn't a portable power station that loses capacity after a winter. It's field-tested chemistry designed for permanent off-grid installation, with automatic SOC balancing that maximizes efficiency across the battery's entire lifespan.

Power Architecture That Grows Without Rebuilding

Power Architecture That Grows Without Rebuilding

Start with 12.288kWh and scale to 180kWh by adding plug-in expansion batteries — no tools, no rewiring, no starting over. The 12kW inverter handles 45kW surge through an Adaptive Start algorithm that identifies each appliance and tailors startup accordingly, so your 5-ton AC or well pump starts cleanly. With 10kW of solar input across two MPPT ports and generator integration for extended runtime, this system adapts to your consumption as it changes. The optional Smart Home Panel 3 lets you prioritize circuits in the app, extending backup time by up to 42% during prolonged outages.

Is This System Right for Your Home?

Verify your setup meets these requirements before ordering.

  • Home has 120/240V split-phase electrical service
  • Floor space available: 26.6 in × 18.7 in per inverter unit
  • AC input available: 100/200-120/240V, 50A

Built for Real-World Scenarios

This system handles the loads that matter most when the grid goes down.

Whole-Home Backup
HVAC & Well Pump Support
Solar Integration
Off-Grid Homestead Power

Full specifications

At a glance

Dimensions
26.6 × 18.7 × 9.06 in
Power
12kW, 100/200-120/240V, 50A
Warranty
See product page
Compliance
See product page
Full specifications14 data points across 4 categories

Dimensions

Inverter Dimensions26.6 × 18.7 × 9.06 in
Battery Dimensions26 × 18 × 8 in
Inverter Weight70.06 lbs
Battery Weight111.3 lbs

Power & Performance

Standard Capacity12.288kWh, 6144Wh x 2
Maximum Capacity (1 Inverter)61.440kWh, 6144Wh x 10
Maximum Capacity (3 Inverters)184.32kWh, 6144Wh x 30
AC Output12kW, 120/240V, 60Hz | Up to 36kW in 3 parallel units
AC OutletsNEMA 5-20 (x2) 120V 20A, NEMA L14-30 (x1) 120/240V 30A, NEMA 14-50 (x1) 120/240V 50A
Rated AC Input Power12kW, 100/200-120/240V, 50A
PV InputTotal 10kW, 2 ports | 80-500V/15A, 5000W Max Each

Materials

Battery ChemistryLFP

Compliance & Warranty

WarrantySee product page
ComplianceSee product page

The Off Grid Vault Promise

Every system we sell is backed by real support, not a ticket queue.

Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
Free ShippingShips free on all orders, including LTL freight — no surprise charges at checkout.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right. Uninstalled returns accepted within 30 days.

DELTA Pro Ultra X Whole-Home Backup Power

The EcoFlow DELTA Pro Ultra X is the ultimate whole-home backup power solution, designed to keep every appliance and essential circuit running seamlessly during any outage. Delivering a massive 12kW of output—expandable up to 36kW when multiple units are connected—it provides full 120V/240V service capable of powering your entire home, including heavy-duty systems like HVAC, refrigerators, and well pumps. With expandable storage from 6.1kWh to an impressive 180kWh, the Ultra X adapts to your energy needs, whether you’re looking for short-term emergency power or long-term off-grid reliability.

Setup is fast and flexible, featuring EcoFlow’s plug-and-play installation and smart home integration that can be ready in as little as seven days. The automatic transfer switch activates in less than 20 milliseconds, ensuring a smooth transition when the grid goes down. The system supports up to 10kW of solar input and is compatible with gas or propane generators for extended runtime, giving you complete control over how you power your home.


Engineered with advanced LFP battery technology, the DELTA Pro Ultra X offers safe, efficient, and long-lasting energy storage. A comprehensive Battery Management System (BMS) provides real-time monitoring, temperature regulation, and overcharge protection, while the weather-resistant enclosure makes it suitable for both indoor and outdoor installation. With intelligent load management and energy prioritization, the Ultra X ensures that your most critical systems stay powered longer without unnecessary energy waste.

Perfect for homeowners who want professional-grade backup power without the complexity of traditional systems, the EcoFlow DELTA Pro Ultra X combines high performance, scalability, and smart energy management in one future-ready solution. From everyday peace of mind to complete energy independence, it’s built to power your life—anytime, anywhere.

Inverter Includes: EcoFlow DELTA Pro Ultra X Inverter, EcoFlow PV Switch Box, EcoFlow AC Charging Cable, EcoFlow Battery Connection Cable (2.46ft), EcoFlow DELTA pro Ulta/Ultra X Portable Stand, 4 x EcoFlow Side Mount Casters. EcoFlow Solar Panel MC4 Disconnect Tool, User Manual

Battery Includes: EcoFlow Smart Extra Battery (Deltra Pro Ultra X), EcoFlow Battery Conneciton Cable (.65ft), and User Manual


DELTA Pro Ultra X Whole-Home Backup Power

EcoFlow DELTA Pro Ultra X Specs

  • Standard Capacity: 12.288kWh, 6144Wh x 2
  • Maximum Capacity with 1 inverter: 61.440kWh, 6144Wh x 10
  • Maximum Capacity with 3 inverters: 184.32kWh, 6144Wh x 30
  • AC Output: 12kW, 120/240V, 60Hz | Up to 36kW in 3 parallel units
  • Inverter Weight: 70.06 lbs
  • Battery Weight: 111.3 lbs
  • Inverter Dimensions: 26.6 × 18.7 × 9.06 in
  • Battery Dimensions: 26 × 18 × 8 in
  • Battery Chemistry: LFP
  • AC Outlets: NEMA 5-20 (x2) 120V 20A, NEMA L14-30 (x1) 120/240V 30A, NEMA 14-50 (x1) 120/240V 50A
  • Rated AC Input Power: 12kW,100/200-120/240V, 50A
  • PV Input: Total 10kW, 2 ports | 80-500V/15A, 5000W Max Each
  • IP Rating: IP54
  • Battery Temperature: −4°F to 113°F
  • Inverter Temperature: −4°F to 122°F



EcoFlow DELTA Pro Ultra X Features

  • High Power. High IQ.: DELTA Pro Ultra X scales from 12 to 36kW. With a new Adaptive Start algorithm, it intelligently identifies connected appliances and tailors startup for each, seamlessly handling surges up to 45kW and high-demand appliances like a 5-ton AC.
  • Smart Extreme-Weather Protection: Heats batteries in extreme cold for safe charging and longer runtime, while high-temp protection allows charging even at up to 45°C (113°F).
  • 12–180kWh Capacity, Power That Lasts : Start with 12kWh. Scale instantly to 180kWh
    with up to 30 plug-in expansion batteries, no tools, no hassle. Power grows with your needs. The wide-body inverter and battery are a stand-alone, off-grid unit, no wall mounting required. Its flexible design allows for faster, simpler approval than grid-tied systems. The exclusive quick-connect makes plug-and-play with the Smart Home Panel 3 or Smart Gateway effortless.
  • During the Storm: Extended Backup Time: With the Optional Smart Home Panel 3, tag appliances by priority in the app. Essentials stay powered while non-essentials are throttled—extending backup time by up to 42%. EcoFlow AI Assistant fine-tunes power use in real time, adapting to weather, usage, and solar input.
  • Durable battery pack: Perfectly matched cells ensure identical capacity, voltage, and resistance, minimizing wear and maximizing battery life. 24/7 Self-Maintenance: Automatic SOC balancing maximizes efficiency across the battery’s entire lifespan.
  • EV-grade full-tab cells: The first EV-grade full-tab cells deliver higher capacity with lower resistance, less heat, and longer-lasting performance. 25% More Efficient power flow (thanks to lower resistance: 1.5 mΩ vs. 2 mΩ) 25% Less Self-Heating
  • No Wasted Watts: With the EcoFlow Current Sense Transformer, every extra watt is redirected to your DELTA Pro Ultra X Smart Extra battery, never wasted or sold back to the grid for pennies.
  • 3-Level System Safety Architecture: Power Protection: 1.2M circuit samples/sec, millisecond-level anomaly detection for inverter and battery. Connection Monitoring: Intelligent cable and interface safeguards track heat, recognize faults, and allow instant shutdown for total electrical security. Load Isolation: Continuous voltage/current monitoring with triple-layer isolation. Faulty devices are cut off automatically while critical loads stay powered.
  • When the Storm Hits: Lights Stay On: EcoFlow DELTA Pro Ultra X, paired with the Smart Home Panel 3 or Smart Gateway, switches your whole home from grid to battery power in under 20ms—faster than a blink. The lights stay on, Wi-Fi stays up, and even the game console keeps running. Zero delays. Zero disruptions.
  • Dual BMS Protection: Local BMS – X-Guard® System: 44+ safeguards and comprehensive monitoring ensures all-around safety. Safeguards: overcharge/discharge, extreme temperatures, short circuits, component failures, and more Cloud BMS – Big Data Protection: 100+ anomaly detectors run 24/7, with instant alerts, local service response, and remote emergency support.



Your Satisfaction with EcoFlow is Guaranteed:

  • 5-Year Limited Warranty
  • Lowest Price Guarantee

Additional information

Bundle Options

1 x Delta Pro Ultra X Inverter + 2 x Batteries, 1 x Delta Pro Ultra X Inverter + 2 x Batteries + Smart Gateway 200A, 1 x Delta Pro Ultra X Inverter + 2 x Batteries + Smart Home Panel 3, 2 x Delta Pro Ultra X Inverters + 4 x Batteries + Smart Home Panel 3

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About ecoflow Portable Power Stations

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

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