EcoFlow DELTA Pro Ultra X
- usable
- 12,288 Wh
- output
- 12,000 W
- weight
- 135.5 kg
#1 of 4
in the Whole-home / mega class · small class (n=4)
Lifted by Durability & longevity and Charging & solar; held back by portability.
$2,598 below its $10,597 list price (25% off)
Verdict computed from this model's own tracked price history.
Capacity truth
The watt-hour number on the box isn't what reaches your devices. Same scale, three readings.
The marketing number — total cell capacity.
Also independently measured
- Solar performance
- —
OEM supports 10kW solar per inverter (2x High-PV 5000W, 80-500V)
How it scores
Four buyer pillars over seven sub-scores — computed from sourced data with a published formula, price-independent by design.
Power
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
The BatteryRank score is computed from sourced data with a published formula — ranked by data, not lab testing. Seven sub-scores blend into a 0–100 composite, grouped into four buyer pillars. Price is deliberately not a scoring input: prices move daily, so value intelligence lives in the price section above, judged against this model's own history.
| Pillar | Built from | Weight |
|---|---|---|
| Power | Capacity & expansion + Output & versatility | 38% |
| Trust | Trust & reliability + Durability & longevity | 33% |
| Charging | Charging & solar | 16% |
| Livability | Portability + Quiet / livability | 13% |
Scores are cohort-relative — each model is ranked against others in its size class. Missing inputs renormalize out rather than scoring zero (a model is never penalized for a spec nobody in its class publishes), and any figure resting on a documented estimate is tagged est. A full methodology page is coming.
Full specifications
Manufacturer-claimed unless marked verified (FCC/UL/DOE/lab). Hover any figure for its source.
Capacity & battery
- Usable capacity
- 12,288 Wh
- Battery chemistry
- LiFePO4
- Max capacity with expansion
- 61,440 Wh
- Rated capacity
- 12,288 Wh
How much energy you can actually pull out of a full charge — the number that determines real runtime, not a marketing headline figure.
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. Real runtime comes from usable capacity and conversion losses, shown separately.
Power output
- Continuous power output
- 12,000 W
- AC outlets
- 4 outlets
- 12V car ports
- 0 ports
- DC barrel ports
- 0 ports
- Max combined output
- 12,000 W
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 — what CPAPs and car fridges plug into for the most efficient overnight running.
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
- Max solar input
- 10,000 W
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
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
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
Aggregated from named outlets and marketplaces — we own no hardware and never fabricate impressions.
- NA — not clearly listed standalone on Amazon US (new whole-home model); OEM positions as fastest-install 12kW/240V whole-home with huge 184kWh system scaling — Amazon reviewers
- largest EcoFlow whole-home system: 12kW/240V (36kW in 3 parallel), 12.288kWh standard scaling to 184.32kWh; fast-install design; 10kW solar; <10ms UPS; NEMA 14-50 + L14-30; 5-yr warranty; quiet — Across reviewers
- NA — brand-new; requires professional install + Smart Home Panel 3; very high cost — Amazon reviewers
- very high cost; requires professional install + Smart Home Panel 3; heavy modular components; brand-new so limited independent testing/owner data — Across reviewers
- Wirecutter: none
- Popular Mechanics: none
- newest EcoFlow whole-home flagship; early coverage emphasizes fast install & 12kW/36kW scaling; 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