Product images: EcoFlow official store
EcoFlow · Whole-home backup system
EcoFlow DELTA Pro Ultra X
Whole-home backup that starts at 12kWh and scales to 180kWh
WattLab Score
How good it is for its size · method
- 12,288 WhCapacity
- 12,000 WAC continuous
- 292.6 lbWeight
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Overview
The DELTA Pro Ultra X pairs a 12kW, 120/240V inverter with two 6,144Wh LFP batteries (12,288Wh) and up to 10kW of solar input. It switches over in under 10 ms and expands to 61kWh per inverter.
Ideal for
Homeowners who want generator-free whole-home backup with solar, including central AC and 240V appliances, and room to expand.
Skip it if
Renters, campers or anyone who needs portable power; a 2–4kWh station is far cheaper for essentials-only backup.
Editor's ratings · 0–10
Score profile
Seven axes on fixed scales, so scores compare directly across every model on WattLab Review.
What's inside the 7.1 WattLab Score
- Charging speed—
- Battery technology6.0
- Energy density (Wh/lb)8.0
- Solar refill speed9.1
- Value (Wh per $)7.1
- Versatility (ports & features)5.2
How long will it run?
Estimated runtimes on a full charge for common devices.
| Device | Typical load | Estimated runtime |
|---|---|---|
| Smartphone charge | 15 Wh each | ~696 charges |
| Wi-Fi router + modem | 15 W | ~696 hr |
| CPAP (no humidifier) | 40 W | ~261 hr |
| Laptop | 60 W | ~174 hr |
| 12V camping fridge (avg) | 35 W | ~298 hr |
| 32" LED TV | 50 W | ~209 hr |
| Full-size fridge (avg) | 150 W | ~70 hr |
| Coffee maker | 1,000 W | ~10 hr |
Estimates use 85% of rated capacity to account for inverter losses. Real runtimes vary with temperature, battery age and how often appliances cycle.
Full specifications
Battery
| Capacity | 12,288 Wh |
|---|---|
| Battery chemistry | LiFePO4 |
| Rated cycle life | — |
Output
| AC output (continuous) | 12,000 W |
|---|---|
| Surge / peak | — |
| Power Lifting (resistive loads) | — |
| AC outlets (120V, pure sine) | 4 |
| USB-C ports | 0 |
| Max USB-C output | — |
| USB-A ports | 0 |
| 12V car outlet | — |
| DC5521 barrel ports | 0 |
Charging
| Max AC charging input | 12,000 W |
|---|---|
| AC charge time (standard) | — |
| Fastest full charge | — |
| Max solar input | 10,000 W |
| Solar input spec | 2 high-voltage ports, 80–500V, 15A, 5,000W each (via the included EcoFlow PV Switch Box) |
| Solar charge time | — |
| Car charge time | — |
Size & build
| Weight | 292.6 lb (135.5 kg) |
|---|---|
| Dimensions | Inverter 26.6 × 18.7 × 9.1 in; each battery 26 × 18 × 8 in |
| Rated noise | ≤30 dB |
| Charging temperature | -4–113°F (-20–45°C, battery) |
| Discharge temperature | -4–113°F (-20–45°C, battery) |
Smart features & warranty
| UPS switchover | ≤10 ms |
|---|---|
| App control | EcoFlow app |
| Expandable battery | Yes |
| Warranty | 5 years |
Value
| Reference price* | $7,899.00 |
|---|---|
| Wh per dollar* | 1.56 Wh/$ |
Other details
| System | 1 inverter + 2 × 6,144Wh LFP batteries |
|---|---|
| Expansion | Up to 10 batteries (61.4kWh) per inverter; up to 3 inverters and 30 batteries (184kWh, 36kW) |
| AC outlets detail | 2 × NEMA 5-20 (120V), 1 × L14-30 (120/240V 30A), 1 × 14-50 (120/240V 50A) |
| Weight detail | Inverter 70.1 lb + 2 batteries at 111.3 lb each |
| UPS | <10 ms standalone; <20 ms with Smart Home Panel 3 |
| Start-up surge | EcoFlow says its Adaptive Start handles surges up to 45kW, enough for a 5-ton AC |
| Noise detail | <30 dB at 0.5 m at 4kW output |
| IP rating | IP54 |
- Fast charging: EcoFlow quotes about 80% in roughly 1 hour under controlled conditions; it accepts up to 12kW of AC input at 240V/50A.
- Solar time: Requires a high-voltage solar array, typically installed by a professional.
- Cycle life: EcoFlow doesn't list a cycle rating on the DELTA Pro Ultra X spec page.
- * Reference price from the manufacturer's US store on the date shown. Amazon's price may be different.
- — means the manufacturer doesn't publish that figure. We never estimate missing specs.
Spec sources
EcoFlow DELTA Pro Ultra X
See today's price and availability on Amazon.com
Our take
The DELTA Pro Ultra X sits at the very top of EcoFlow's range. It isn't something you take camping; it's a modular home battery system built from a 12kW split-phase inverter and stackable 6,144Wh LiFePO4 battery packs. The base kit (one inverter, two batteries) stores 12,288Wh, enough to run a typical home's essentials for a day or more, and its 12kW output can carry central AC, a well pump, an electric range and the rest of the house at once.
Solar capacity is serious: two high-voltage inputs (80–500V) take up to 10kW combined, which means a rooftop or ground-mount array can refill it in a single sunny day. From the grid it accepts up to 12kW at 240V, and EcoFlow quotes about 80% in roughly an hour under controlled conditions. It also works with standard 3–12kW generators.
As backup, it switches over in under 10 ms on its own, or under 20 ms with EcoFlow's Smart Home Panel 3, which manages up to 32 circuits. Outlets on the inverter (two 5-20, an L14-30 and a 14-50) let it run appliances directly or feed an RV or EV, and the battery is rated IP54 with quiet operation under 30 dB at 4kW.
The trade-offs are cost, weight and installation. The base kit weighs about 293 lb across three pieces, the full benefits need a smart panel installed by an electrician, and there's no USB or 12V output. For homes that want generator-free whole-home backup with room to grow to 184kWh, it's one of the most capable systems you can buy.
Pros
- 12kW split-phase output (120/240V) for whole-home loads
- 12,288Wh to start, expandable to 61kWh per inverter and 184kWh total
- 10kW solar input across two high-voltage ports
- <10 ms UPS switchover; IP54 and under 30 dB
- Accepts generator and 12kW AC charging
Cons
- Expensive, and whole-home use needs a smart panel and an electrician
- About 293 lb across inverter and batteries
- No USB or 12V DC outputs
- EcoFlow doesn't publish a battery cycle rating
What owners and reviewers say
Independent reviews
The DELTA Pro Ultra X is a CES 2026 Innovation Awards honoree, according to EcoFlow's product imagery. We haven't found independent hands-on reviews of the X model yet. We'll add Amazon buyer feedback themes once we can verify them.
Compare it head-to-head
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BLUETTI
BLUETTI Elite 30 V2
The pocket-sized LiFePO4 pick with a real 600W inverter
- 288 WhCapacity
- 600 WAC output
- LiFePO4Battery
- 9.48 lbWeight
$289.99reference price*
Jackery
Jackery Explorer 1000 v2
The 1kWh sweet spot for home backup that still fits in a car trunk
- 1,070 WhCapacity
- 1,500 WAC output
- LiFePO4Battery
- 23.8 lbWeight
$559.00reference price*
Jackery
Jackery Explorer 300
The proven ultralight for cameras, drones and weekend camping
- 293 WhCapacity
- 300 WAC output
- Li-ion (NMC)Battery
- 7.1 lbWeight
$289.00reference price*
Ready to decide?
EcoFlow DELTA Pro Ultra X on Amazon.com