EcoFlow DELTA Pro Ultra X
EcoFlow DELTA Pro Ultra X: our review of whole-home backup, battery configuration, installation planning and the limits of its sourced specifications.
- AC delivered · est.
10,445 Wh. Show source
estimated sourceus.ecoflow.com ↗2026-07-04- output
12,000 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- weight
135.5 kg. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Excellent
#1 of 5
in the Whole-home / mega class · small class (n=5)
Lifted by Durability & longevity and Charging & solar; held back by portability.
Check current availability and pricing at the retailer.
See alternatives to the EcoFlow DELTA Pro Ultra X →At a glance
We review EcoFlow DELTA Pro Ultra X as a whole-home / mega model. Use output, delivered capacity and startup limits to check your appliances. It supplies 12,000 W of continuous AC output. BatteryRank scores it 80 out of 100 within its size class.
EcoFlow DELTA Pro Ultra X specs at a glance
Find the reading you need, then follow its source in the full specifications below.
- How much does the EcoFlow DELTA Pro Ultra X weigh?
135.5 kg (298.7 lb), manufacturer-claimed, without accessories.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- What are the dimensions of the EcoFlow DELTA Pro Ultra X?
675 × 475 × 230 mm (26.6 × 18.7 × 9.1 in), length × width × height, manufacturer-claimed.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- How many watts can the EcoFlow DELTA Pro Ultra X output?
12,000 W continuous AC output, manufacturer-claimed. Appliance startup demand must stay within the relevant limit.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- How much solar input can the EcoFlow DELTA Pro Ultra X accept?
10,000 W maximum solar input, manufacturer-claimed. Actual harvest depends on panel compatibility, sun, orientation, temperature, and conversion losses.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- How far can the EcoFlow DELTA Pro Ultra X expand?
Up to 61,440 Wh with compatible expansion hardware, manufacturer-claimed. The base-unit capacity and expansion-system capacity are shown separately.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Our verdict on the EcoFlow DELTA Pro Ultra X
We review the DELTA Pro Ultra X as a whole-home backup system, not a carry-to-camp battery. Our tracked configuration holds 12,288 Wh with 12,000 W continuous output and a total 135.5 kg system weight. EcoFlow’s standard US bundle pairs an inverter with two batteries; confirm the exact bundle and home connection before comparing specifications. Its 10,000 W sourced solar ceiling describes input capability, not daily harvest. The useful purchase decision is which circuits need backup, for how long, and what installation they require.
- You are replacing a standby generator rather than supplementing oneThe tracked 12,000 W continuous rating and 12,288 Wh pack support planning for multiple circuits. Backup duration depends on their average energy demand; the capacity figure does not guarantee several days of operation, and motor startup still needs checking.
- You have roof capacity you actually intend to useThe 10,000 W solar ceiling is the highest we hold by a factor of nearly two, and it is the only figure on this unit that makes the storage size coherent.
- You want anything resembling portability135.5 kg is more than double the 61 kg of the largest Jackery we track, and the absent 12 V socket confirms the design never intended vehicle or field use. The DELTA Pro Ultra is 82.4 kg against 135.5 kg for comparable architecture.
- You need a 12 V DC output for a fridge, pump or vehicle accessoryThis model has zero 12 V car sockets. Every 12 V load would have to run through an inverter and a separate adapter, wasting energy on a double conversion. The 5000 Plus provides a 12 V DC socket, which this unit omits entirely.
The trade-off to weigh: Whole-home backup is a system purchase: inverter count, battery count, connection hardware and installation affect the result. Our current record lacks a sourced surge rating and cycle-life figure. Those gaps matter when assessing motor startup and long-term use, so confirm the current configuration’s documentation before buying on its scale alone.
What our data can’t tell you: Our sourced record has no surge figure, cycle rating or depth-of-discharge threshold for this configuration. Continuous output and rated capacity remain useful for sizing, but neither establishes a motor’s startup compatibility or lifetime battery retention. We distinguish these record gaps from a claim that the manufacturer publishes no such information; check the current manual for the bundle you intend to install.
- — Identified the system configuration behind the headline ratings and removed an unconditional multi-day backup claim. Missing fields describe our record, not the manufacturer’s entire documentation.
- — Added a single-versus-system buying checklist for the exact configuration queries; surge and cycle-life gaps remain open in our record.
BatteryRank Engineering Team · Last reviewed · Method
Sources checked for this review:EcoFlow US bundle and installation details
Where to buy
Affiliate links: we may earn a commission if you buy, at no extra cost to you. Commission never affects our rankings.
EcoFlow DELTA Pro Ultra X
Capacity truth
The watt-hour number on the box isn't what reaches your devices. Rated on the label vs what actually leaves an outlet.
12,288 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04The marketing number — total cell capacity.
10,445 Wh. Show source
estimated sourceestimate = battery-side usable capacity × 85% inverter efficiencyWhat reaches an AC outlet — about 15% is lost turning battery power into household AC. How we estimate.
Also independently measured
- Solar performance
—. Show source
verified sourceOEM supports 10kW solar per inverter (2x High-PV 5000W, 80-500V)2026-07-04
OEM supports 10kW solar per inverter (2x High-PV 5000W, 80-500V)
What it can run
Same sourced device assumptions used by our calculators, applied to this model's usable AC energy. Actual runtime varies with load, temperature, and standby draw.
| Device | Estimated runtime | Sourced assumption |
|---|---|---|
| CPAP (humidifier off) | about 145.1 nights | 9 W · |
| CPAP (heated humidifier on) | about 23.3 nights | 56 W · |
| Refrigerator (full-size) | about 166 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 580 hours | 18 W · |
| Laptop (65W charger) | about 321 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 522 full charges | 20 W · |
Who it fits
Mechanical matches against this model's own sourced specs — never invented sentiment, never a guess on a spec we don't have.
10445 Wh AC-delivered (est.) → multiple CPAP nights per charge
12000 W inverter, 10445 Wh AC-delivered (est.) → runs a fridge through an outage
12288 Wh, expandable → long off-grid stays
How it scores
Four buyer pillars over seven sub-scores — computed from sourced data with a published formula, price-independent by design.
Power
Battery-side usable capacity and how much you can run at once.
Usable watt-hours and how far you can grow it with add-on batteries, versus its size class.
Continuous and surge wattage, outlet count, and USB-C fast-charging.
Trust
42% dataOwner reputation, safety record, warranty, and build durability.
Owner ratings, brand reputation, recall record, and warranty backing.
Rated cycle life, warranty length, cell chemistry, and weather sealing.
Charging
est.Wall and solar recharge speed.
Wall recharge speed, solar input, and multi-source charging.
Livability
62% dataLightweight, portable, and quiet enough to live with.
Weight, footprint, handle, and wheels, versus its size class.
Fan noise under load — quieter is better for bedrooms and CPAP use.
How this score is computed
We score the hardware using sourced specifications and independently attributed measurements. Seven sub-scores form a 0–100 composite, grouped into four buyer pillars. The score is price-independent: a sale changes what you pay, while this analysis evaluates the station's capabilities within its size class.
| Pillar | Built from |
|---|---|
| Power | Capacity & expansion + Output & versatility |
| Trust | Trust & reliability + Durability & longevity |
| Charging | Charging & solar |
| Livability | Portability + Quiet / livability |
Scores are cohort-relative — each model is ranked against others in its size class. Missing inputs renormalize out rather than scoring zero. Incomplete evidence can leave a sub-score unavailable; it does not establish that a model performs well. Any figure resting on a documented estimate is tagged est. Read our scoring and evidence methodology.
Full specifications
Manufacturer-claimed unless marked verified (FCC/UL/DOE/lab). Tap or focus a figure to view its source.
Capacity & battery
- Battery-side usable capacity
12,288 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Battery chemistry
LiFePO4. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Max capacity with expansion
61,440 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Rated capacity
12,288 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Energy available from the battery before output-conversion losses. AC-delivered capacity is shown separately in Capacity Truth.
The type of battery cell. LiFePO4 (LFP) cells last far more cycles and are more thermally stable than older lithium-ion (NMC) cells.
The largest total capacity this unit can reach once you add every supported expansion battery.
The battery's nameplate energy capacity — the headline number on the box. Battery-side usable and AC-delivered capacity are shown separately.
Power output
- Continuous power output
12,000 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- AC outlets
4 outlets. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- 12V car ports
0 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- DC barrel ports
0 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Max combined output
12,000 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
The most power you can draw at once, sustained — this has to be higher than the running wattage of whatever you're plugging in.
How many standard wall-style outlets are built in.
How many car-socket (cigarette-lighter) style 12V outputs are built in. Match the device or its supported converter to the port's voltage and current limits; a CPAP needs its exact model's documented power connection.
How many round barrel-style DC outputs are built in, used by routers, some lights, and older electronics.
The most power the unit can deliver across ALL ports at the same time — can be lower than the AC rating plus every USB port added up.
Charging & solar
- AC recharge speed
12,000 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Max solar input
10,000 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
How fast the unit recharges from a wall outlet — higher means shorter waits between uses.
The most solar panel wattage the unit can accept — undersized panels just mean slower charging, not damage, but oversizing this is wasted money.
Reliability & durability
- UPS switchover time
10 ms. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
How fast the unit takes over when grid power cuts out. Under ~20ms is fast enough that most electronics — including many CPAP machines — won't even blip.
Size & portability
- Weight
135.5 kg. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
How much the unit weighs on its own, without accessories — relevant for portability and carrying it up stairs during an outage.
What reviewers & owners report
Named outlets and marketplaces, each rating credited where it was published.
- largest EcoFlow whole-home system: 12kW/240V (36kW in 3 parallel), 12.288kWh standard scaling to 184.32kWh — Across reviewers ·
- fast-install design — Across reviewers ·
- 10kW solar — Across reviewers ·
- <10ms UPS — Across reviewers ·
- NEMA 14-50 + L14-30 — Across reviewers ·
- 5-yr warranty — Across reviewers ·
- quiet — Across reviewers ·
- very high cost — Across reviewers ·
- requires professional install + Smart Home Panel 3 — Across reviewers ·
- heavy modular components — Across reviewers ·
- brand-new so limited independent testing/owner data — Across reviewers ·
- Wirecutter: none
- Popular Mechanics: none
- newest EcoFlow whole-home flagship — YouTube reviewers ·
- early coverage emphasizes fast install & 12kW/36kW scaling — YouTube reviewers ·
- no measured consensus yet as of 2026-07-04 — YouTube reviewers ·
Brand reputation: 2025/2026 newest whole-home flagship; too new for meaningful owner/reliability data as of 2026-07-04. Brand-level: EcoFlow DELTA Max 2000 (EFD310, older gen) fire recall 2025-10 (separate product)
Sources: us.ecoflow.com/products/delta-pro-ultra-x (full on-page Specs) accessed 2026-07-04; amazon.com search (no clear standalone US listing) 2026-07-04; saferproducts.gov (EcoFlow) checked 2026-07-04
What else to consider instead of the EcoFlow DELTA Pro Ultra X
Same or adjacent size class, ordered by the price-independent composite. Every alternative is better than the EcoFlow DELTA Pro Ultra X at something and worse at something else, so each row states both halves — each one arithmetic on two sourced readings, with a dimension skipped rather than guessed when either side is missing a figure.
- Pecron F5000LFPscore 69 · same size class
- Why you would switch
- The Pecron F5000LFP is 59% lighter (56.2 kg vs 135.5 kg).
- What you give up
- The EcoFlow DELTA Pro Ultra X delivers 140% more usable AC energy (10,445 Wh vs 4,352 Wh).
- EcoFlow DELTA Pro Ultrascore 57 · same size class
- Why you would switch
- The EcoFlow DELTA Pro Ultra is 39% lighter (82.4 kg vs 135.5 kg).
- What you give up
- The EcoFlow DELTA Pro Ultra X delivers 100% more usable AC energy (10,445 Wh vs 5,222 Wh).
- Jackery Explorer 5000 Plusscore 56 · same size class
- Why you would switch
- The Jackery Explorer 5000 Plus is 55% lighter (61 kg vs 135.5 kg).
- What you give up
- The EcoFlow DELTA Pro Ultra X delivers 144% more usable AC energy (10,445 Wh vs 4,284 Wh).
- Zendure SuperBase V6400score 46 · same size class
- Why you would switch
- Nothing in the sourced data separates it from the EcoFlow DELTA Pro Ultra X by a margin worth acting on.
- What you give up
- The EcoFlow DELTA Pro Ultra X delivers 91% more usable AC energy (10,445 Wh vs 5,472 Wh).
- EcoFlow DELTA Pro 3score 76 · one class over
- Why you would switch
- The EcoFlow DELTA Pro 3 is 62% lighter (51.5 kg vs 135.5 kg).
- What you give up
- The EcoFlow DELTA Pro Ultra X delivers 176% more usable AC energy (10,445 Wh vs 3,790 Wh).
Quick answers
Each answer restates a sourced figure from elsewhere on this page — nothing new, nothing guessed.
- How many milliamp-hours (mAh) is the EcoFlow DELTA Pro Ultra X?
- Its manufacturer-claimed capacity is 12,288 Wh. A mAh conversion also needs the battery's nominal voltage: mAh = Wh × 1,000 ÷ V. Our record has no sourced nominal battery voltage, so we leave the mAh figure unspecified. USB output voltage is not a substitute for battery voltage. Compare watt-hours across power stations. Use the mAh to Wh converter.
- How much capacity does the EcoFlow DELTA Pro Ultra X deliver through an AC outlet?
- About 10,445 Wh of the rated 12,288 Wh reaches an AC outlet from a full charge — an estimate after our published 15% inverter-loss constant (marked est. on this page).
- Can the EcoFlow DELTA Pro Ultra X work as a UPS?
- Its manufacturer-claimed transfer time is 10 ms. Confirm that your connected equipment tolerates that transfer time; this is not the same as a zero-transfer online UPS.
Questions from our review
Our model-specific analysis, with the sources checked for each answer.
- Am I buying one battery or a whole-home system?
- A system. We review the tracked 12,288 Wh / 12,000 W / 135.5 kg configuration as one inverter paired with two batteries in EcoFlow’s standard US bundle — confirm that exact bundle, the battery count and the home connection before comparing numbers. Base and expanded capacity are different figures, and a single unit’s rating never describes the whole install. It is not portable, it has no 12 V car socket, and installation planning is part of the purchase, not an accessory to it.
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