EcoFlow DELTA Pro Ultra X Whole-Home Backup Power System 12kW 12.3kWh
EcoFlow DELTA Pro Ultra X Whole-Home Backup Power System 12kW 12.3kWh
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The EcoFlow DELTA Pro Ultra X Whole-Home Backup Power System delivers up to 12kW of continuous output, combining a high-performance inverter with a 6kWh LFP battery for reliable home energy. Its modular design supports expansion up to 61.4kWh with a single inverter or 184.3kWh with three, making it suitable for whole-home backup, off-grid living, or commercial use.
Built with durable LiFePO₄ cells, the system offers ultra-fast UPS switching under 10ms, smart app control, and seamless solar integration with up to 10kW DC input for hybrid operation.
Key Features
| Brand | EcoFlow |
| Model | EFYJ751-BP |
| Product Type | Portable Power Station |
| Standard Capacity | 12.288kWh, 6144Wh x 2 |
| AC Output | 12kW, 120/240V, 60Hz | Up to 36kW in 3 parallel units |
| Battery Chemistry | LFP (LiFePO₄) |
| Inverter Weight | 34.5 kg |
| Battery Weight | 50.5 kg |
| Inverter Dimensions | 675 × 475 × 230 mm |
| Battery Dimensions | 660 × 455 × 204 mm |
| 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 |
| DC Input | Total 10kW, 2 ports | 80-500V/15A, 5000W Max Each |
| UPS Switchover | <10ms standalone, <20ms with Smart Home Panel 3 |
| Noise Level | <30 dB at 0.5 m (ambient temperature 25 °C, 4 kW output) |
| IP Rating | IP54 |
| Inverter Operating Temperature | −20°C to 50°C |
| Battery Operating Temperature | −20°C to 45°C |
| Operating Humidity | <90% |
| Maximum Altitude | <3000 m |
| Maximum Capacity (1 Inverter) | 61.440kWh, 6144Wh x 10 |
| Maximum Capacity (3 Inverters) | 184.32kWh, 6144Wh x 30 |
| Protection Type | Overvoltage, Overload, Overtemperature, Short Circuit, Low Temperature, Low Voltage, Overcurrent |
| Warranty | 5 years |
Highlights
Whole-Home Power Capacity - Deliver up to 12kW of continuous AC output or expand with three inverters (36kW total) — powerful enough to run HVAC systems, EV chargers, and all major home appliances simultaneously.
Expandable Energy Storage - Pair with up to 10 Smart Extra Batteries per inverter for a total capacity of 61.4kWh, or scale to 184.3kWh with three inverters — ideal for long-term backup or full off-grid living.
Smart, Seamless UPS - Experience <10ms switchover time (standalone) or <20ms with the Smart Home Panel 3. Home power remains active during grid outages.
Durable LFP Battery Chemistry - Built with LiFePO₄ (LFP) cells for safety, stability, and an extended life cycle — ensuring long-term performance with over 3,500 cycles to 80% capacity.
Intelligent System Management - Monitor, control, and optimize the power system through the EcoFlow app or the integrated LCD screen for real-time performance tracking.
Modular Design for Every Home - Stackable batteries, portable stands, and simple installation make scaling up the system effortless — from a small home setup to a complete solar-integrated powerhouse.
Compatibility
Compatible with EcoFlow Smart Home Panel 3 for automated transfer, load balancing, and real-time energy control. Supports up to three inverters in parallel and up to 10 Smart Extra Batteries per inverter.
How to use
Connect the inverter to your home's electrical panel or use the AC outlets directly. Add Smart Extra Batteries for extended storage. Pair with solar panels via the DC input ports for hybrid charging. Monitor and control the system through the EcoFlow app or the integrated LCD screen.
Warranty
- 5-year manufacturer's warranty
What's included
Included components:
- 1 x EcoFlow Delta Pro Ultra X Inverter
- 1 x EcoFlow PV Switch Box
- 1 x EcoFlow Charging Cable
- 1 x EcoFlow Battery Connection Cable (2.465ft)
- 1 x EcoFlow Delta Pro Ultra / Ultra X Portable Stand
- 4 x EcoFlow Side Mount Caster
- 1 x EcoFlow Solar Panel MC4 Disconnect Tool
- 1 x EcoFlow Smart Extra Battery (DELTA Pro Ultra X)
- 1 x EcoFlow Battery Connection Cable (0.65)
- 1 x User Manual & Warranty Card
Frequently asked questions
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Do I have to pay for shipping?
Do I have to pay for shipping?
Not at all! We offer Free Standard Shipping on all orders within the United States. There are absolutely no hidden fees or extra costs—the price you see at checkout is the final price delivered to your door.
How long will it take for my order to arrive?
How long will it take for my order to arrive?
We work hard to get your equipment to you as fast as possible. Most orders are processed within 1 business day, and transit typically takes 2-4 business days. On average, you can expect your package at your doorstep within 3-5 business days.
Can I track my order?
Can I track my order?
Yes, definitely! As soon as your order ships, we’ll send you a confirmation email with your tracking number.
You can follow your delivery anytime by clicking the “Track Your Order” icon in our website menu. Simply enter your tracking number to see the latest updates on your package’s journey to your door.
Trusted by Our Customers
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Michael T⭐⭐⭐⭐⭐
We’ve already had one power outage since installing our home battery, and it worked exactly as expected. The transition was quick and it kept our refrigerator, lights, Wi-Fi, and a few other essentials running. Very happy with the purchase and the service from the store.
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James S⭐⭐⭐⭐⭐
I wanted something more convenient than relying on a gas generator every time the power goes out. The battery system has been quiet, easy to manage, and dependable so far. Delivery was smooth and everything arrived well packaged.
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Sarah N⭐⭐⭐⭐⭐
I spent quite a bit of time comparing home backup options before ordering. So far, I’m impressed with the build quality and overall performance. The ordering process was simple, shipping updates were clear, and the unit arrived in excellent condition.