Head-to-head test
EcoFlow DELTA Pro Ultra + 1 Battery vs EcoFlow DELTA Pro Ultra X
Both hold 12,288Wh and tie every one of the six scenarios we test, so the $2,100 gap between them isn't buying more power you'll use — it's buying a 45,000W surge ceiling you'll need exactly once, or never.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
EcoFlow
DELTA Pro Ultra + 1 Battery
10,756Power Score · Whole-Home Capable
$5,999.00 · direct from EcoFlow
Last checked 6 days ago. Prices move — check before you buy.
EcoFlow
DELTA Pro Ultra X
12,800Power Score · Whole-Home Capable
$7,999.00 · direct from EcoFlow
Last checked 6 days ago. Prices move — check before you buy.
Spec deltas
Both of these hold exactly 12,288Wh, and both of them clear every one of the six scenarios we model — Weekend Camping, an 8-Hour Blackout, even Van Life Daily's 4,685Wh, our single biggest test, which still uses only 45% of either battery. When two products tie on every scenario on the page, that's not a coincidence of similar engineering. It's a sign the scenarios stopped being the test that matters.
So the fight moves to where it actually happens: $5,899 against $7,999, a 10-year warranty against 5, and a surge ceiling of 10,800W against 45,000W. The DELTA Pro Ultra + 1 Battery is the cheaper unit to own by every measure we track — $0.12 per lifetime kWh against $0.19, $590 per warranty year against $1,600. The DELTA Pro Ultra X answers a different question entirely: it delivers 12,000W continuous, well past the Ultra + 1 Battery's 7,200W, for the homes whose breaker panel actually asks for it.
We're not manufacturing a winner here. If your heaviest simultaneous load fits inside 7,200W continuous, the Ultra + 1 Battery is strictly better: cheaper, longer warranty, more cycles, and still untouched by anything in our test scenarios. If it doesn't, the Ultra X is the only one of these two that was ever actually in the running.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
At this capacity tier the scenario model has nothing left to discriminate on — both units clear every load with more than half their tank still full, so a six-scenario tie isn't a coincidence, it's a ceiling effect of testing two identical-sized batteries.
Both units hold 12,288Wh of usable base capacityThe largest scenario we model, Van Life Daily, needs 4,685Wh — 45% of that capacity for both units
Why it mattersStop reading the scenario grid for a winner here and go straight to price, warranty, and surge headroom instead — that's where this comparison actually lives.
That premium isn't buying peace of mind — it's buying headroom: 12,000W continuous and a 45,000W surge ceiling against the smaller unit's 7,200W and 10,800W, the kind of gap that only a well pump or a 5-ton AC compressor's startup draw will ever touchB1.
The Ultra + 1 Battery costs $5,899 with a 10-year warranty, $590 per warranty yearThe Ultra X costs $7,999 with a 5-year warranty, $1,600 per warranty year
Why it mattersIf your panel will never ask for more than 7,200W at once, the X's extra cost buys a shorter warranty and nothing you'll use. If it will, the Ultra + 1 Battery was never a real option regardless of price.
continuous output
That's not an error in either score. PowerScore rewards raw electrical headroom; lifetime-cost rewards cheap, long-lived Wh. This is the rare pair where picking one winner means picking which of those two questions you actually care about.
The Ultra X scores 14,944 on our PowerScore bench against 11,691 for the Ultra + 1 BatteryThe gap traces to output, surge, and solar ceiling: 12,000W/45,000W/10,000W against 7,200W/10,800W/5,600W
Why it mattersDon't average the two scores in your head. Decide first whether your panel's peak draw sits closer to 7,200W or genuinely needs the X's 12,000W ceiling, then let that answer choose which metric to trust.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: All six scenarios tie because both hold the same 12,288Wh — establishes upfront that this section won't decide anything, so the reader moves to what does.
All six scenarios we model resolve the same way: both units clear the load, and both have most of their capacity left over afterward. That's not a coincidence of similarly sized batteries — it's the same battery. Both hold 12,288Wh, so a same-size ruler measures them identically every time, from a 320Wh CPAP night at 3% of capacity to a 4,685Wh Van Life Daily at 45%.
That means this section, unusually, tells you nothing about which one to buy. Read it as confirmation that neither unit is undersized for your use case, then move to lifetime cost and the gotchas below for the decision that actually separates them.
What the Specs Don't Tell You
Selected because: Four Test Notes fire (weight, surgeRatio, ups, warranty); surgeRatio is the one with a hard capability gate behind it, not just a preference.
rated cycles
Four things separate these two once you look past the identical 12,288Wh headline: weight, switchover speed, surge headroom, and warranty. Weight and switchover speed turn out to be close to a wash — 293.6 lbs against 298.7, 0ms against 10ms. Surge headroom and warranty are where the real gap sits.
The surge gap has teeth. EcoFlow's own materials point to a 5-ton AC compressor as exactly the load that needs the Ultra X's surge ceilingB1 — its 45,000W clears that easily, where the Ultra + 1 Battery's 10,800W is a much tighter fit. If your panel carries a load like that, that settles the comparison outright. If it doesn't, the extra $2,100 buys headroom you'll never touch.
Lifetime Value
Selected because: cheaperToOwn is p1 by every computed measure — needs to be stated plainly and reconciled honestly against the tie verdict.
cost / lifetime kWh
Here's where the two actually separate. The Ultra + 1 Battery costs $5,899 with a 10-year warranty — $590 per warranty year. The Ultra X costs $7,999 with a 5-year warranty — $1,600 per warranty year, nearly three times as much for half the coverage. Cost per lifetime kWh tells the same story: $0.12 against $0.19.
More cycles compound the gap: 4,000 against 3,500, so the Ultra + 1 Battery is also rated to outlast the X by 500 charge cycles on top of costing less and carrying twice the warranty. By every economic measure in our model, the Ultra + 1 Battery is the cheaper unit to own, and not narrowly.
Growth Path
Selected because: Both expand identically on paper; the computed recommendation's solar-ceiling gap is the one real difference worth surfacing.
solar input
Both expand — this pairing already assumes a stacked build, since the Ultra + 1 Battery is the two-battery configuration of its platform, matched here against the Ultra X's own two-battery base. Neither one caps you at 12,288Wh if your needs grow later.
The difference is how fast you can refill a bigger bank once you've built one: the Ultra X accepts up to 10,000W of solar, the Ultra + 1 Battery tops out at 5,600W. If you're buying at this size because you plan to keep adding batteries and panels for years, that solar ceiling is the one column here where paying more buys a longer runway.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra + 1 Battery
Strengths
- +Costs $2,000 less
- +Lighter by 5.1 lb
- +Longer warranty
Trade-offs
- –Weaker inverter (-4,800W) limits appliance compatibility.
- –Very heavy unit that may be difficult for one person to lift.
EcoFlow DELTA Pro Ultra X
Strengths
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$2,000) than the DELTA Pro Ultra + 1 Battery.
- –Very heavy unit that may be difficult for one person to lift.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
SCN-01 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
A 2,100Wh weekend uses 20% of either battery's 12,288Wh — both come home with four-fifths still in the tank. Camping was never going to be the test that separates these two; save the deliberation for price and warranty.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
Either unit
1,645Wh over eight hours is 16% of capacity for both units — a blackout this size barely dents either one. If your outages ever run longer or your panel draws harder, that's a surge and runtime question these two answer identically; the $2,100 price gap is the one that doesn't.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
Either unit
A CPAP pulling 320Wh overnight uses 3% of either unit's capacity — both are wildly oversized for this job alone. Buying either as a dedicated CPAP backup means most of the battery sits idle every night; that's a decision about whole-home backup, not sleep apnea.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Either unit
910Wh for a remote workday is 9% of capacity on both — laptops and monitors don't come close to finding a difference between these two. The gap that matters for a home office is whether the wiring behind it can handle 12,000W of continuous draw elsewhere in the house, not which battery is bigger.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
Neither unit
670Wh for a tailgate is 6% of either battery — both shrug this off with room to run it back for a second game. This is the easiest scenario on the page for both units, and the least useful one for choosing between them.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Either unit
4,685Wh a day is the heaviest scenario we model, and it's still only 45% of capacity for both — the single biggest test on this page and neither one breaks a sweat. If daily van life is the real use case, the question isn't whether either battery is big enough; it's whether you want to carry a 293.6-lb system in a rig at all.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
Dead heat — both run this 205W load for roughly 51h. Pick on price, weight, or ports.
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–696.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–139.3hHigh-Draw Appliances
These reveal the real limitsscale 0–10.4h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
July 28, 2026
Verdict: the DELTA Pro Ultra + 1 Battery
Every number that measures day-to-day use comes back identical: both hold 12,288Wh, and all six load scenarios tie because of it. Where they split is economics against headroom. By our lifetime-cost model the Ultra + 1 Battery is cheaper to own on every measure — price, cost per lifetime kWh, cost per warranty year — and we're not softening that. But cheaper only matters once a unit can do the job, and the Ultra X's 12,000W continuous rating and 45,000W surge ceiling exist for panels the Ultra + 1 Battery's 7,200W and 10,800W physically can't serve. That's a real fork in what these two units are for, not a coin flip, which is why this is a tie we're calling with conviction rather than a tie because we couldn't decide.
Editor-assigned confidence, based on cited owner research and spec analysis.
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 28, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, DELTA Pro Ultra + 1 Battery rates 3.7/5 (25th percentile of 29 Whole-Home / Off-Grid-class units), and DELTA Pro Ultra X rates 4.3/5 (61st percentile of 29 Whole-Home / Off-Grid-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
293.6 lbs vs 298.7 lbs — Both Need a Dolly
A 5.1-lb difference is noise when both units already weigh about as much as a loaded washing machine. Plan a hand truck and a clear path to the install spot for either one — this isn't a spec that should move the decision.
Surge Headroom: 1.5x vs 3.75x Rated Output
The Ultra + 1 Battery surges to 10,800W against a 7,200W continuous rating — 1.5 times. The Ultra X surges to 45,000W against 12,000W continuous — 3.75 times. That extra headroom is what lets a compressor or a well pump kick on without tripping the inverter.
0ms vs 10ms Switchover
The Ultra + 1 Battery is a true double-conversion UPS — a 0ms gap, power never actually interrupts. The Ultra X switches over in under 10ms, fast enough that most electronics ride through it without a blink, but it isn't the same zero-gap guarantee.
10-Year Warranty vs 5-Year Warranty
The Ultra + 1 Battery is covered twice as long — 10 years against 5 — and at $590 per warranty year against $1,600, it's the cheaper coverage by a wide margin even before counting the $2,100 lower purchase price.
Ownership Analysis
What happens after you buy — true cost of ownership, brand trust, and growth potential.
Lifetime value
Service lifeyears at one full cycle per day
Lifetime energy delivered
Cost per delivered kWh
│ warranty ends · Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
Analyst note
The DELTA Pro Ultra + 1 Battery wins on both sticker price and long-term value. At $0.12/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Growth path
DELTA Pro Ultra + 1 Battery
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 5,600W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
DELTA Pro Ultra X
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 10,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the DELTA Pro Ultra X's higher solar ceiling (10,000W vs 5,600W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA Pro Ultra + 1 Battery
Owner commentary on this exact '+1 Battery' stacked configuration barely exists — nearly everything available discusses the base DELTA Pro Ultra alone, and even that record is thin. The clearest pattern is unreliable state-of-charge metering: one owner watched the display drop from 90% down to 8% after a few days of overnight use and rechargingA9, and a separate owner flagged that the app has no SoC history graph at all, despite charting input and output over timeA8.
Support experience is the second recurring theme. One owner called EcoFlow's manual superficialA5; another reported the unit interfering with ham radio frequencies whenever it's powered on and says support's suggested fix was a faraday cageA6A7; a third, commenting on the brand more broadly, described some hardware issues and lots of firmware issuesA10. The bluntest summary comes from an owner who called the whole unit kind of meh and said they were unlikely to ever expand it into their houseA4 — sentiment about the base unit, not a verdict on the two-battery configuration priced on this page.
“When the fans are not on, the inverter emits zero noise...even when I put my ear against the case.”
Sources
windinmyface.com · diysolarforum.com
EcoFlow DELTA Pro Ultra X
Independent owner commentary on the Ultra X barely exists yet — it's a new CES 2026 honoree, and everything in the record so far traces back to EcoFlow's own materials and early reviews rather than owner forumsB4. Treat the following as manufacturer-stated capability, not field-tested experience: a base configuration delivering 12,000W continuous across every circuit in a home, including a 5-ton AC compressor, with surge handling to 45,000W through what EcoFlow calls Adaptive StartB1.
The cells are described as EV-grade full-tab LFP with a multi-layer safety architecture and continuous BMS oversight, plus solar input up to 10,000WB3. None of that has an independent owner complaint thread to weigh against it yet, the way the older DPU does. That cuts both ways — no red flags on record, but also no track record.
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
Sources
ecoflow.com · outboundpower.com · bobvila.com · thesolarlab.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- SoC/battery metering appears unreliable, with reported percentage dropping much faster than expected after resuming charge cycles [DELTA Pro Ultra + 1 Battery · 2 entries]
- Support interactions were unhelpful or dismissive when owners raised specific technical issues (manual gaps, RFI, missing SoC graph) [DELTA Pro Ultra + 1 Battery · 3 entries]
- Fan behavior/noise is a recurring point of owner scrutiny, though direct DPU-specific noise data is thin and partly inferred from sibling EG4 units [DELTA Pro Ultra + 1 Battery · 3 entries]
- Whole-home 12kW output, massive scalability (to 184kWh), EV-grade LFP, 10kW solar, and fast install are the standout features. [DELTA Pro Ultra X · 3 entries]
- A4
“Pulled the trigger on an EcoFlow Delta Pro Ultra (DPU) and I'm kind of meh on it and unlikely to expand or integrate it into the house.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A5
“No real manual. All they have is the web user guide which is superficial if I'm being generous.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A6
“Even when the inverter is not running, it interferes with common frequencies like 146.520MHz... Turn off the DPU, emission goes away.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A7
“I contacted EcoFlow support and they told me I could put it in a "faraday cage".”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A8
“No State of Charge graph in the app. Figured if they were showing charts of Input and Output over time, they must have a SoC chart. Nope.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A9
“After a few days of using it overnight and letting it charge back up to "90%", it'd go from "90%" down to "8%".”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A10
“They're great for certain use cases but some hardware issues and lots of firmware issues.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' (reply from another EcoFlow product owner, D2M, discussing brand-wide pattern) · 2024-02 · [negative]
- B1
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X review · 2026 · [positive]
- B3
“EV-grade full-tab LFP cells with a multi-layer safety architecture and 24/7 BMS oversight; solar charging up to 10kW.”
ecoflow.com / bobvila.com — DELTA Pro Ultra X review · 2026 · [positive]
- B4
“A quick-connect design cuts installation time and cost by up to 80%, ready in about 7 days; a CES 2026 Innovation Award Honoree at a $7,999 base price.”
ecoflow.com / thesolarlab.com — DELTA Pro Ultra X review · 2026 · [positive]
Research compiled July 28, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra + 1 Battery if you…
- →Buy the Ultra + 1 Battery if your panel's heaviest simultaneous draw stays comfortably under 7,200W continuous and 10,800W surge — the two ceilings it's actually built to. At $5,899 with a 10-year warranty and 4,000 cycles, it's the cheaper unit to own by every measure in our lifetime-cost model, and none of the six scenarios we test come close to stressing it.
Buy the DELTA Pro Ultra X if you…
- →Buy the Ultra X if you already know your panel needs more than 7,200W continuous or more than 10,800W surge — a large central AC, a well pump, or several heavy circuits running together. That's a job the Ultra + 1 Battery physically cannot do, and no price or warranty advantage changes that. You're also buying the stronger off-grid growth path: a 10,000W solar ceiling against 5,600W, worth it if you plan to keep adding panels and batteries for years.
If neither fits
Neither is the right buy if you don't need whole-home backup at all — these are 12,288Wh, 290-plus-pound systems built to run a house, and a portable station a tenth the size and price covers camping, a home-office outage, or a CPAP with plenty of room to spare.
The Bottom Line
Six scenarios, six ties — at 12,288Wh apiece, neither unit ever gets tested by anything we model, so the real decision is a $2,100 price gap, a warranty that's twice as long (10 years against 5), and a surge ceiling more than four times larger (45,000W against 10,800W). If your panel's peak draw stays under 7,200W continuous, the Ultra + 1 Battery wins on every dollar and every warranty year. If it doesn't, the Ultra X was the only one actually competing.
Call this a tie on conviction, not on indecision — the facts point in two clear directions depending on one number this page can't see: your own breaker panel.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Do the DELTA Pro Ultra + 1 Battery and DELTA Pro Ultra X have the same capacity?
Yes — both are 12,288Wh at this configuration, which is exactly why every scenario we model comes out tied. The difference between them isn't storage, it's how fast each one delivers and refills that storage.
Which is cheaper to own long-term, the Ultra + 1 Battery or the Ultra X?
The Ultra + 1 Battery, by a clear margin. It costs $5,899 against $7,999, carries a 10-year warranty against 5, and works out to $0.12 per lifetime kWh against $0.19. If your power needs fit inside what it can deliver, there's no economic case for paying more.
Why does the DELTA Pro Ultra X cost $2,100 more?
Surge and continuous output. The Ultra X delivers 12,000W continuous and surges to 45,000W, against 7,200W and 10,800W for the Ultra + 1 Battery. If your home has a load large enough to need that — a big central AC or a well pump — the cheaper unit isn't an option at any price. It just can't do the job.
Does the Ultra X's 10ms switchover matter for a UPS use case?
For most electronics, no — 10ms is fast enough that computers, routers, and modern appliances ride through it on internal capacitors without a blink. The Ultra + 1 Battery's 0ms is a true double-conversion UPS with zero gap, which only matters for equipment that's genuinely intolerant of any interruption, like certain lab or medical gear.
Is there real owner feedback yet on the '+1 Battery' expansion configuration?
Not much. Available commentary covers the base DELTA Pro Ultra rather than this exact stacked configuration, and coverage of the Ultra X is almost entirely manufacturer and review-site material since it's a new CES 2026 release. Neither ledger says much yet about how these two specific configurations hold up after a year of real use.
Related comparisons
Where to buy
EcoFlow DELTA Pro Ultra + 1 Battery
$5,999.00
$5,999.00 · direct from EcoFlow
Last checked 6 days ago. Prices move — check before you buy.
EcoFlow DELTA Pro Ultra X
$7,999.00
$7,999.00 · direct from EcoFlow
Last checked 6 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.