Head-to-head test
EcoFlow DELTA 3 1500 vs EcoFlow DELTA 3 Ultra Plus
EcoFlow has stopped selling the 1500, so the only live question is the one underneath it: whether your loads end at a workday's 910Wh or a camping weekend's 2,100Wh, because that is the line these two fall on either side of.
Full profiles: EcoFlow DELTA 3 1500 → · EcoFlow DELTA 3 Ultra Plus →
Looking for a different matchup? EcoFlow DELTA 3 Ultra vs DELTA 3 Ultra Plus
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
The DELTA 3 1500 is no longer part of EcoFlow's range. There's no price and no buy button for it on this page, and the recommendation below has exactly one candidate. If you came here wanting roughly what the 1500 gave you, EcoFlow's nearest live unit to it is the DELTA 3 Max.
That still leaves a comparison worth making, because these two were never the same kind of purchase. Twice the battery, twice the inverter, and a bit over twice the weight: 1,536Wh and 1,800W in a 36 lb box against 3,072Wh and 3,600W in a 74.3 lb one. You're not picking a model here. You're picking a size class, and the only number that decides it is whatever your own loads add up to in one sitting.
The line falls between a workday and a weekend. Both units run a remote workday's 910Wh without thinking about it; only the Ultra Plus finishes a 2,100Wh camping weekend, where the 1500 stops 794Wh short. So add up one full cycle of what you actually run. If it clears about 1,300Wh, which is where the 1500 lands after the flat 85% derate this site applies to every unit, the small class is out of the conversation no matter which box you were looking at.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
solar input
That inverts the assumption most people bring to this decision, which is that the small unit is the nimble one. On any stretch longer than a single night, neither battery is big enough to coast on: the van-life row shows even the Ultra Plus running a daily deficit. What keeps that deficit from compounding isn't capacity, it's how much of a good solar day the unit can actually swallow, and the 1500's intake is the narrowest thing on this page.
DELTA 3 Ultra Plus: 3,072Wh capacity, 1,600W solar input ceilingDELTA 3 1500: 1,536Wh capacity, 500W solar input ceilingVan Life Daily needs 4,685Wh; neither unit covers it (Ultra Plus 2,074Wh short, about 56% covered)
Why it mattersIf your plan involves living off panels for more than a weekend, shop the input ceiling before you shop the battery.
weight
The size line sits somewhere between a workday and a weekend. Below about 1,300Wh of usable draw, the light unit wins on the carry and the heavy one is just a heavier way to get the same night. Above it, the light unit doesn't finish at all, and being easy to lift stops being a feature of anything. That's why this is a class decision and not a model decision: the question is which side of that number you live on, not which badge you prefer.
DELTA 3 1500: 36 lbs. DELTA 3 Ultra Plus: 74.3 lbsTailgate Party needs 670Wh (1500 at 51% used, Ultra Plus at 26%); Remote Workday needs 910Wh (70% vs 35%); CPAP Overnight needs 320Wh (25% vs 12%)Weekend Camping needs 2,100Wh against the 1500's 1,306Wh usable, leaving it 794Wh short
Why it mattersTotal one full cycle of your real loads. Under 1,300Wh, buy small and enjoy the trunk. Over it, no amount of carrying convenience buys back the watt-hours.
rated cycles
Neither unit has a settled long-term record you could buy on, but the two gaps are different in kind. With the 1500 you'd be betting on a platform posters had already flagged and that its maker has since stopped building. With the Ultra Plus you'd be betting on a unit nobody has owned long enough to vouch for yetB0. Thin evidence on a current product is a waiting problem. Thin evidence on a discontinued one is the end of the story.
DELTA 3 1500 rated for 3,000 cycles minimum (8.2 years at daily use); DELTA 3 Ultra Plus rated for 4,000 (11 years)Forum posters reported a neighbour losing three 1500 units in about eight monthsA1, with thread consensus putting the Delta 3 line ahead of the Delta 2 for failure reportsA2 and describing the 1500 as Delta 2 UPS electronics in a new caseA3The Ultra Plus ledger is entirely review-site testing over days to weeks, with no long-term owner accounts, no firmware reports and no cold-weather dataB0
Why it mattersIf you own a 1500 and it's working, this page is not an argument to replace it. If you're buying, the reliability question was settled by the listing coming down.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Four of the six modelled scenarios go to the Ultra Plus, one is a dead heat, and one defeats both units, which is the clearest map of where the size line actually falls.
Four rows to the Ultra Plus and one to both reads like a rout until you notice what the rows are doing. On the CPAP night, the workday and the tailgate, both units finish and the Ultra Plus simply has more left over, and leftover charge is not a benefit you spend. The two rows where the 1500 actually fails, the camping weekend and the eight-hour blackout, are the ones carrying the whole argument.
The Van Life Daily row goes to neither unit, and it's the most useful line on the table. 4,685Wh a day is more than the Ultra Plus's 2,611Wh usable can reach, leaving it 2,074Wh short at about 56% covered, with the 1500 at about 28%. If that's your day, this page's honest answer is that you're shopping one shelf too low and no result here will change it.
Runtime: Will It Power Your Gear?
Selected because: 1,306Wh usable against 2,611Wh is what decides which loads finish and which stop early.
continuous output
Twice the battery doesn't buy twice the comfort on any one night. It buys a second night. A remote workday is 910Wh, which the 1500 covers at 70% of its usable charge and the Ultra Plus at 35%. Run it twice without touching a wall socket, 1,820Wh, and the 1500 is 514Wh past its 1,306Wh usable while the Ultra Plus still has 791Wh in hand. That's the split: the small unit wins nights, the big one wins stretches.
Both usable figures come off the same flat 85% derate this site applies to every unit, so read them as a consistent haircut rather than a measurement of either box. It's still the honest version of a nameplate, and it's why a 1,536Wh battery does a 1,306Wh job.
Portability & Form Factor
Selected because: 36 lbs against 74.3 is the one axis the smaller unit wins outright, and the reason anyone hesitates over the bigger one.
weight
36 lbs is a one-person lift out of a trunk with one hand free for the cooler. 74.3 lbs is two hands, bent knees, and a hard look at the stairs first, and one reviewer called it thunderousB9. Our spec record doesn't track wheels or a telescoping handle, and at this weight those change the job completely, so look at the product photos before you plan a walk from the car.
This is the Ultra Plus's one genuine loss, and it's worth sitting with rather than waving past. If your use is a tailgate and a porch, you will feel those 38 lbs every single time and the extra watt-hours exactly never. The counterargument isn't that the weight is fine. It's that the weekend you actually bought the thing for is the one the lighter box doesn't finish.
Growth Path
Selected because: Both take EcoFlow expansion batteries, but only one has a solar ceiling large enough to refill them.
solar input
Both units take EcoFlow expansion batteries, which makes the growth line look like a tie. It isn't, and the reason is the socket rather than the battery: whatever you bolt onto the 1500 still has to refill through the narrower of the two solar doors. Expansion you can't refill inside a day is storage, not capacity.
There's a blunter point underneath. One of these has an expansion path you can still buy into, and the other doesn't have a base unit you can still buy. The 1500's expandability is now a fact about a machine you may already own, not a reason to choose one.
What the Specs Don't Tell You
Selected because: Five cards fire on this pair; two of them are real differences and three only look like differences.
rated cycles
Two of these five cards look like differences and aren't. The warranty is the same five-year term on both records. The cycle-life card is mostly capacity wearing a hat: 4,000 cycles against 3,000 is a third more charges, but because a cycle is twice as large on the Ultra Plus, lifetime energy works out at roughly 12,288 kWh against 4,608. That's the size class showing up again, not a longevity story.
The UPS card is the one to read carefully, because both figures are ratings and neither is a measurement. Rated no worse than 10ms against no worse than 15ms, and forum discussion pegged the 1500's cutover at the slower end against a sub-10ms figure quoted for its own siblingsA5. If what's plugged in is a desktop with unsaved work, that class distinction is worth respecting. If it's a router and a modem, it's nothing.
Strengths & trade-offs
EcoFlow DELTA 3 1500
Strengths
- +Lighter by 38.3 lb
Trade-offs
- –Weaker inverter (-1,800W) limits appliance compatibility.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA 3 Ultra Plus's 4,000, so it wears out sooner.
EcoFlow DELTA 3 Ultra Plus
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Significantly heavier (+38.3 lbs), making it harder to move.
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
DELTA 3 Ultra Plus
The DELTA 3 1500 doesn't finish — 1,306Wh usable against the 2,100Wh this needs leaves it 794Wh short, about 62% of the scenario covered. The DELTA 3 Ultra Plus covers it with 511Wh to spare.
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
DELTA 3 Ultra Plus
Eight hours of fridge, lights and devices comes to 1,645Wh, and the 1500 has 1,306Wh usable. It doesn't get you to morning. It's 339Wh short, and with 1,645Wh spread across eight hours that's roughly the last hour and a half spent in the dark wondering what you got wrong. The Ultra Plus finishes the same eight hours with 966Wh still in the bank, which is most of a second evening you didn't plan for.
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 is about 40W, so a night runs near 320Wh and both units sleep straight through it: the 1500 at a quarter of its usable charge, the Ultra Plus at an eighth. Capacity decides nothing here, so the decision moves to eighteen inches from your head. The Ultra Plus lists 30dB, a spec-sheet figure rather than a measurement, and the 1500 lists nothing at all. That's not evidence it's louder; it's a fan you'd be meeting at 2 a.m. for the first time.
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
DELTA 3 Ultra Plus
The DELTA 3 Ultra Plus clears the workday at 35% used, banking 1,701Wh — late work, extra calls, or a second laptop charge without arithmetic. The DELTA 3 1500 at 70% also finishes, with 396Wh of slack for the unplanned.
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
DELTA 3 Ultra Plus
Both handle game day; the DELTA 3 Ultra Plus keeps more in reserve (26% used vs 51%). Tailgating is a light load, though, so the number you'll feel is weight: 36 lbs for the DELTA 3 1500 against 74.3 lbs for the DELTA 3 Ultra Plus, from the trunk to the setup spot.
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
Neither unit
Neither unit covers a van day's 4,685Wh. The 1500 gets about 28% of the way and the Ultra Plus about 56%, still 2,074Wh short. Read that as partial cover rather than a near miss: you'd be running the essentials off either box and topping up from somewhere every single day, which is a different kind of life than the one you were picturing. If this is the plan, the answer isn't on this page. It's a bigger bank and a roof full of panels.
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
For this load: DELTA 3 Ultra Plus runs 12.7h vs 6.4h.
$1,599 list · direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sized →
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 0–174.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–34.8hHigh-Draw Appliances
These reveal the real limitsscale 0–2.6h¹ 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
September 19, 2026
Verdict: the DELTA 3 Ultra Plus, on Power Score margin
Take the DELTA 3 Ultra Plus. It's the only one of the two EcoFlow still sells, and it's also the one the scenarios favour: 2,611Wh usable finishes a 2,100Wh camping weekend with 511Wh spare and an eight-hour blackout with 966Wh spare, both of which the 1500 misses. The decision underneath is a size class rather than a model. The 1500's 1,306Wh usable covers a CPAP night, a tailgate and a remote workday, and stops there. If that's genuinely all you run, the smaller class is the right shelf, and the DELTA 3 Max is EcoFlow's nearest live unit to what the 1500 covered. If anything you run reaches past a single workday, the Ultra Plus is the buy, and its 74.3 lbs is the honest price of it.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open EcoFlow's current price.
$1,599.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Price to beat:DELTA 3 Ultra Plus $1,499
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): CPAP, Apartment Balcony, Camping.
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 3 1500 rates 5.0/5 (99th percentile of 27 Everyday-class units), and DELTA 3 Ultra Plus rates 4.9/5 (96th percentile of 26 Large-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.
74.3 lbs Is the Bill for the Bigger Battery
This is the real cost of the size class, and it should be said plainly about the unit we're recommending. 74.3 lbs is a two-handed, bent-knees lift, and it is not something to walk down basement stairs alone. The 1500 is 36 lbs, a genuine one-person pick-up. Our spec record doesn't track wheels or a telescoping handle, and at this weight those change the job completely, so look at the product photos before you plan on carrying it from the car to the site.
UPS Switchover: ≤10ms vs ≤15ms
Both list a UPS mode, at different rated speeds. The DELTA 3 Ultra Plus is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The DELTA 3 1500 is rated ≤15ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: Five Years Each, One Clock You Can Start
Both units carry a five-year term on our record, so on terms alone coverage is not a tiebreaker. Where it matters is simpler than the terms: a warranty is only as good as the purchase it attaches to, and one of these two is no longer sold new. If you're buying, you're buying the Ultra Plus and its five years from the day it arrives. If you already own a 1500, the five years on our record describes the model, not your unit. Check what's left of yours against your own receipt and registration.
Battery Lifespan in Real Years
The DELTA 3 Ultra Plus is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. One caution reading years across different sizes: a cycle is 3,072Wh on the DELTA 3 Ultra Plus and 1,536Wh on the DELTA 3 1500, so count lifetime energy — roughly 12,288 kWh against 4,608 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
DELTA 3 1500: Noise Level Not Disclosed
The DELTA 3 Ultra Plus publishes its noise level (30dB); the DELTA 3 1500 doesn't publish one. That isn't evidence the DELTA 3 1500 is louder — it means there's no figure to hold it to, and no way to compare the two on this without hearing them. If you're buying for a bedroom, a CPAP, or an apartment, treat the DELTA 3 Ultra Plus's 30dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the DELTA 3 1500 before deciding.
Full record above — the Test Desk pick is the DELTA 3 Ultra Plus.
Check DELTA 3 Ultra Plus 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 3 1500 is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the DELTA 3 Ultra Plus works out at $0.13/kWh over its rated life. If you already own the DELTA 3 1500, the hardware comparison still holds: over its rated life the DELTA 3 1500 delivers about 4,608 kWh and the DELTA 3 Ultra Plus about 12,288 kWh.
Growth path
DELTA 3 1500
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,536Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
DELTA 3 Ultra Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,072Wh.
Accepts up to 1,600W 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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Growth only counts if you can still buy in, and the DELTA 3 1500 is no longer sold (EcoFlow points owners to the DELTA 3 Max). That leaves the DELTA 3 Ultra Plus: it starts at 3,072Wh and takes EcoFlow expansion batteries, so the ceiling moves if your needs do. The DELTA 3 1500's expandability still matters if you already own one, but it isn't a reason to pick it over the DELTA 3 Ultra Plus.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 1500
Field evidence on the 1500 is thin and secondhand, and our researcher says so outright: nothing specific to this SKU surfaced on Reddit, in YouTube comments or in Amazon reviews, and the two forum threads that do discuss it wouldn't load for direct capture, so what we have are paraphrases of indexed snippets rather than quotesA0. What's there isn't warm. One poster's neighbour went through three 1500s in roughly eight monthsA1, and the wider thread leaned toward the Delta 3 line drawing more failure reports than the Delta 2, with one poster noting their two Delta 2 units never gave a single problemA2. Posters also described the 1500 as a hybrid: Delta 2 UPS-cutover electronics in a new case, around what one called larger grade B cellsA3.
Two questions never got settled. Idle draw for the line was argued between roughly 25 to 30W and a firmware fix said to cut about 40W down to 17W, with nobody sure the 1500 ever received it, and our researcher flags that this thread may be describing a sibling SKU, so read it for character rather than as a specA4. Cutover time drew the same shrugA5. A small sample, no long-term owners, and a unit now out of production: that's the entire record.
“Posters described the Delta 3 1500 as essentially a Delta 2/Delta 3 hybrid — UPS-cutover electronics carried over from the Delta 2, housed in a new case with what one called "larger grade B cells."”
Sources
diysolarforum.com
EcoFlow DELTA 3 Ultra Plus
The Ultra Plus has coverage but not owners. Everything in its ledger comes from review sites working over days or weeks, with no forum threads, no cold-weather accounts, no firmware reports and nothing at the six-month markB0. Inside that limit the reviews agree on the two things buyers ask about first. Noise: reviewers consistently describe it as very quiet even under sustained load, one putting it near EcoFlow's DELTA Pro UltraB1B2B13. Build: one review says flatly that it doesn't feel cheap or fragileB8, and another notes it's rated for a 0.2m drop with moisture resistance aimed at overnight dewB14.
Two findings the spec sheet doesn't carry. It doesn't throttle its output down to match whatever it's drawing in at the wall, which plenty of stations doB4, and pulling it off wall power produced no dip or shut-off in one reviewer's testingB6. One reviewer worked a full eight-hour day on it, laptop and desktop workstation and monitors, and finished with 40% leftB5. The consistent complaint is the screen: in direct sun it washes out badly enough that a reviewer cupped their hands around it to read the statusB7.
“even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max”
Sources
thesolarlab.com · postperspective.com · appleinsider.com · digitaltrends.com · storagereview.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
- Forum posters flagged the Delta 3 1500 as less reliable than EcoFlow's earlier Delta 2, both from direct failure reports and from its unusual hybrid Delta 2/Delta 3 hardware platform. [DELTA 3 1500 · 3 entries]
- Idle power draw and UPS cutover time are both discussed as possible regressions or open questions relative to the standard Delta 3 / Delta 3 Plus, without firm confirmation for the 1500 variant specifically. [DELTA 3 1500 · 2 entries]
- Professional reviewers consistently describe the fan noise as very quiet even under heavy load, comparable to EcoFlow's premium DELTA Pro Ultra line. [DELTA 3 Ultra Plus · 3 entries]
- Reviewers report solid UPS/pass-through charging performance with no noticeable switchover issues or output throttling tied to input wattage. [DELTA 3 Ultra Plus · 2 entries]
- The unit's high weight (~74 lbs) and premium MSRP are repeatedly flagged as drawbacks, though discounted street pricing is seen as making the value proposition much stronger. [DELTA 3 Ultra Plus · 3 entries]
- Build quality/durability is praised as substantial and non-fragile across multiple independent reviews. [DELTA 3 Ultra Plus · 2 entries]
- A1
“A poster's neighbor had three separate Delta 3 1500 units fail on him over roughly eight months.”
diysolarforum.com — "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" · 2026-02 · [negative]
- A2
“Forum consensus leaned toward the Delta 3 line seeing more failure reports than the Delta 2 — one poster said their two Delta 2 units never gave them a single issue by comparison.”
diysolarforum.com — "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" · 2026-02 · [negative]
- A3
“Posters described the Delta 3 1500 as essentially a Delta 2/Delta 3 hybrid — UPS-cutover electronics carried over from the Delta 2, housed in a new case with what one called "larger grade B cells."”
diysolarforum.com — "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" · 2026-02 · [mixed]
- A4
“Idle power draw for the Delta 3 line was debated — some cite roughly 25-30W, others said a firmware update cut it from about 40W to 17W — and posters weren't sure whether the 1500 specifically had received that fix.”
diysolarforum.com — "EcoFlow Delta 3 1500? Any user experiences" and "...refurbed from EF for $360pt" threads · 2026-02 to 2026-03 · [mixed]
- A5
“The Delta 3 1500's UPS cutover was pegged at 15ms in forum discussion, versus a sub-10ms cutover reported for the standard Delta 3 and Delta 3 Plus.”
diysolarforum.com — "EcoFlow Delta 3 1500? Any user experiences" · 2026-03 · [mixed]
- B1
“even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- B2
“we'd probably say the noise it creates is similar to what you hear when you run the DELTA Pro Ultra, which is pretty amazing”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- B4
“Many power stations limit you to the input wattage when outputting power, but this EcoFlow power station does not”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- B5
“I was able to work remotely for an eight-hour day with 40% power left, which included running my laptop, desktop workstation and monitors”
postperspective.com — Review: EcoFlow Delta 3 Ultra Plus Portable Power Station · 2026-04 · [positive]
- B6
“I didn't experience any shut-offs or dips when I unplugged the EcoFlow from the wall”
postperspective.com — Review: EcoFlow Delta 3 Ultra Plus Portable Power Station · 2026-04 · [positive]
- B7
“while facing the sun, I had to employ the classic "cup hands cover" maneuver to get a clear look at the screen status”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [mixed]
- B8
“It does not feel cheap or fragile. Everything from the outer shell case to the plastic buttons and the AC cable feels substantial and durable”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [positive]
- B9
“Weighing in at a thunderous 74 pounds, the Ultra is not considered lightweight by any standards”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [mixed]
- B13
“Each unit operates quietly at under 25dB, remaining unobtrusive even during sustained loads”
storagereview.com — EcoFlow DELTA 3 Max Plus & Ultra Plus Review · 2025-09-30 · [positive]
- B14
“the Delta 3 Ultra Plus can withstand drops of up to 0.2m, and both models feature moisture resistance to mitigate risks from overnight dew”
storagereview.com — EcoFlow DELTA 3 Max Plus & Ultra Plus Review · 2025-09-30 · [positive]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA 3 1500 if you…
- →You already own one and it still works. Nothing here is an argument to replace a running unit. 36 lbs, 1,800W, 3,000 cycles minimum: none of that changed when the listing came down.
- →You wanted exactly what it covered, 1,536Wh in a body one person can carry, and you want it new. That's a real profile, and the answer to it is the DELTA 3 Max, EcoFlow's nearest current unit to what the 1500 did. It isn't anything on this page.
- →You've found leftover retailer stock. Judge it on the specs here rather than on the assumption that discontinued means bargain, and weigh it against the failure reports posters raised about this platformA1A2.
Buy the DELTA 3 Ultra Plus if you…
- →You want one box that finishes a camping weekend. 2,611Wh usable covers the 2,100Wh version of that weekend with 511Wh spare, which is the difference between a weekend and a weekend spent watching a percentage.
- →Your blackout plan is a fridge, lights and devices for a full evening. Eight hours at 1,645Wh with 966Wh still in the bank means you ride it out instead of rationing, and there's a second evening in what's left.
- →You're building toward solar. This is the unit on the page with the intake to actually use panels, and the only one still sold, which turns the expansion path into a plan rather than a hope.
- →A desktop with unsaved work sits on the circuit. Rated no worse than 10ms, it's the faster of the two classes on paper, which is all either rating ever was.
If neither fits
If your day looks like the Van Life row, 4,685Wh of fridge, laptops, lights and cooking, every day, neither of these finishes it: the Ultra Plus covers about 56% and the 1500 about 28%. Close the tab and price a hardwired home backup or a proper van build with alternator charging, because you're shopping one shelf too low. And at the other end, if the biggest thing you'll ever run is a CPAP and a phone charger, both of these are batteries you'd never reach the bottom of. Buy smaller and keep the money.
The Bottom Line
Buy the DELTA 3 Ultra Plus, and buy it understanding you're choosing a size class rather than winning an argument. The 1500 isn't sold any more, so the recommendation had one candidate before anyone opened the spec table. The specs would have pointed the same way for anybody whose loads run past a single workday: 1,306Wh usable finishes a CPAP night, a tailgate and a remote day, and it does not finish a camping weekend or an eight-hour blackout. Being 38 lbs lighter doesn't buy those watt-hours back.
If you already own a 1500, keep it. It starts everything these scenarios throw at it and a retired listing doesn't change what's in the box. If you wanted that unit and can't have it, the DELTA 3 Max is EcoFlow's nearest live equivalent and the right place to look next. But if you're standing here with two sizes in front of you, take the one that gets you to Sunday.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 3 1500 discontinued?
Yes. EcoFlow has taken it out of its range, which is why this page shows no price and no buy button for it. The nearest current EcoFlow unit to what it covered is the DELTA 3 Max. Its specs are still accurate and still worth comparing if you own one or turn up leftover retailer stock.
How much more power does the DELTA 3 Ultra Plus have than the DELTA 3 1500?
Exactly twice: 3,072Wh against 1,536Wh, with 3,600W of output against 1,800W. After the flat 85% derate this site applies, that's 2,611Wh usable against 1,306Wh. In practice it's the difference between finishing a 2,100Wh camping weekend and landing 794Wh short of one.
Can the DELTA 3 1500 run a fridge and lights through an 8-hour blackout?
Not the version of that night we model. It needs 1,645Wh and the 1500 has 1,306Wh usable, so it comes up 339Wh short: the tail of the evening rather than the whole night, but the tail is when you'd notice. The Ultra Plus covers the same eight hours and still has 966Wh in reserve.
Is the DELTA 3 Ultra Plus too heavy to carry?
74.3 lbs is a careful two-handed lift out of a trunk and a two-person job on stairs; one reviewer called it thunderous. Our spec record doesn't track wheels or a telescoping handle, so check the product photos before you plan a long carry. The 1500 is 36 lbs, and that is the single axis where the smaller unit wins outright.
How loud is the EcoFlow DELTA 3 1500?
Nobody publishes a figure for it, EcoFlow included, so there's nothing to hold it to. The Ultra Plus lists 30dB, a spec-sheet number rather than a measurement, and reviewers describe it as very quiet even under sustained load. An absent figure is not evidence the 1500 is loud. It just means you'd be finding out for yourself.
Where to buy
EcoFlow DELTA 3 1500
No longer sold
EcoFlow DELTA 3 Ultra PlusPick
$1,599.00
$1,599.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.