Head-to-head test
EcoFlow DELTA 3 1500 vs EcoFlow DELTA 3 Plus
The DELTA 3 1500 holds 512Wh more and costs $100 less than the Plus, so unless you recharge off solar — where the Plus's 1,000W input against the 1500's 500W refills a tank in a fraction of the time — the bigger, cheaper unit wins.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 3 1500
3,548Power Score · Appliance Class
$599.00 · direct from EcoFlow
Last checked 39 days ago. Prices move — check before you buy.
EcoFlow
DELTA 3 Plus
2,992Power Score · Appliance Class
$669.00 · direct from EcoFlow
down from $719 · 7% below usual
Last checked 6 days ago. Prices move — check before you buy.
Spec deltas
The DELTA 3 1500 holds 1,536Wh and costs $599. The DELTA 3 Plus holds 1,024Wh and costs $699. The cheaper unit is also the bigger one by 512Wh, which is an unusual place to start a comparison — normally you pay more to get more.
What the Plus's extra $100 actually buys is a different set of strengths, not more capacity. It takes 1,000W of solar input to the 1500's 500W, weighs 9 lbs less at 27 against 36, is rated for 4,000 charge cycles to 3,000, and switches over faster as a UPS, 10ms against 15ms. On paper that's a genuinely well-rounded unit — and it still costs more per lifetime kilowatt-hour, $0.17 against $0.13, because none of it closes the capacity gap.
There's a wrinkle in the Plus's quiet-UPS pitch, too. It publishes a 30dBA rating and markets itself as near-silent, but reviewers repeatedly report its fans activating even under light load and cycling on and off erraticallyB1. The 1500, for its part, lists no noise figure at all. One unit's quiet is contested; the other's is simply unlisted.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Even though the Plus is rated for more cycles, 4,000 against 3,000, the 1500's capacity-per-dollar is strong enough to stay cheaper per lifetime kilowatt-hour. The Plus's extra lifespan doesn't buy back the energy it's missing at any given moment.
The DELTA 3 1500 holds 1,536Wh against the Plus's 1,024Wh — 512Wh moreThe 1500 costs $599 to the Plus's $699 — $100 lessThe 1500 costs $0.13 per lifetime kWh against the Plus's $0.17
Why it mattersOn raw capacity and value the 1500 wins outright, which forces the Plus to justify its premium on something other than how much energy it stores.
solar input
Both facts push the same direction on recharge speed: twice the input filling two-thirds the battery means the Plus can go empty to full in a single strong solar window, where the 1500 needs most of a good solar day to do the same. Off-grid, where the sun is your only outlet, that's the spec that decides whether tomorrow starts with a full battery.
The DELTA 3 Plus accepts 1,000W of solar input against the 1500's 500WThe Plus holds 1,024Wh; the 1500 holds 1,536Wh
Why it mattersSolar-first buyers — van-lifers, off-grid cabins, anyone recharging from panels rather than a wall — should weight the Plus's 1,000W input heavily; it's the one place the smaller, pricier unit clearly earns its keep.
For a bedside CPAP or a desk UPS, erratic low-load fan cycling is exactly the failure a quiet rating is supposed to rule out, and reviewers believe it's a firmware issue EcoFlow could still patchB4. But the 1500's silence on the spec sheet isn't reassurance either — it's just untested. Neither unit is a safe bet for someone who needs guaranteed quiet today.
The Plus is rated 30dBA and marketed as near-silent, yet reviewers report its fans running even at low load and cycling erraticallyB1The erratic cycling also raises the risk of overheating under heavy loads, per those reviewsB2The 1500 publishes no noise figure at all
Why it mattersBuyers who truly need dependable low-load quiet should wait for the Plus's fan fix or shop outside this pair — the published 30dBA doesn't describe the unit reviewers actually ran.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: The 1500 wins every scenario with a winner on the strength of 512Wh more capacity — the core of the value case.
Every scenario that produces a winner goes to the 1500, and for one reason: it holds 512Wh more. The decisive case is the remote workday, which fits the 1500 at 70% of its capacity but overruns the smaller Plus at 105% — the Plus can't finish a full day of laptop, monitor, and router that the 1500 handles with margin to spare.
The lighter scenarios both units clear, the 1500 clears with more left over. That's the pattern: wherever capacity decides, the bigger tank wins, and the Plus's advantages sit outside the scenario table entirely. To see why anyone pays more for the Plus, you have to look at how it recharges, not how much it holds.
Lifetime Value
Selected because: The 1500 is cheaper per lifetime kWh despite the Plus's higher cycle rating — the counterintuitive result worth explaining.
cost / lifetime kWh
The Plus is rated for 4,000 cycles against the 1500's 3,000, which stretches to about 11 years of daily use against 8.2 — a real durability edge. And it still loses on cost per lifetime kilowatt-hour, $0.17 against $0.13, because the 1500 delivers 4,608 lifetime kilowatt-hours to the Plus's 4,096 off a bigger battery bought for less money.
That's the whole value story in one line: more cycles can't out-earn more capacity at a lower price. The Plus lasts longer per charge cycle, but each of those cycles moves less energy, and the 1500 started $100 cheaper. Longevity is the Plus's, economics are the 1500's.
Growth Path
Selected because: The Plus's 1,000W solar ceiling against 500W is its one decisive advantage and belongs front and center.
solar input
Both units expand, so neither is a dead end — but the growth stories differ in a way that matters off-grid. The Plus accepts 1,000W of solar against the 1500's 500W, so as you bolt on capacity you can also feed it from twice as many panels, keeping a growing bank charged. The 1500 can grow its battery but not how fast the sun refills it.
For a wall-charged unit that lives in a closet, the solar ceiling is irrelevant and the 1500's bigger, cheaper base is the obvious pick. For a unit that earns its living from panels, the Plus's 1,000W input is the difference between a bank that keeps up with the day's draw and one that falls behind it. Same brand, two genuinely different tools.
What the Specs Don't Tell You
Selected because: UPS speed, cycle life, and the 1500's missing noise disclosure are the concrete spec-true differentiators.
rated cycles
The UPS gap favors the Plus: a 10ms line-interactive cutover against the 1500's 15ms standby, both quick, the Plus quicker and steadier for sensitive gear. Cycle life favors the Plus too, 4,000 against 3,000. Warranty is a tie at five years, so it settles nothing.
The flag that lands on the 1500 is disclosure: EcoFlow publishes a 30dBA figure for the Plus and none for the 1500. On its own that would tilt the quiet question to the Plus — except the Plus's real-world fan behavior is the very thing reviewers call outB1, which turns a clean-looking spec advantage into a wash. Two units, neither of which you'd buy sight-unheard for a silent bedroom.
Portability & Form Factor
Selected because: The Plus is 9 lbs lighter, and the bedside-quiet question — its real fan behavior — lives here too.
weight
At 27 lbs the Plus is the easier haul by 9 lbs — a one-hand-and-go unit against the 1500's two-hand lift, and a real difference for anyone loading it into a truck or carrying it to a campsite often. Same 1,800W output on both, so the Plus's lighter build costs you nothing in what it can run, only in what it can store.
The bedside experience is the other half of living with these. The Plus's fans cycling on at low loadB1 is exactly what a light sleeper two feet from the unit would notice at 3 a.m., and it's the thing its 30dBA rating implies won't happen. Until EcoFlow ships the fix reviewers expectB4, a buyer who needs silence should treat the Plus's quiet claim as provisional.
Strengths & trade-offs
EcoFlow DELTA 3 1500
Strengths
- +Costs $70 less
- +Larger battery capacity
Trade-offs
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA 3 Plus's 4,000, so it wears out sooner.
EcoFlow DELTA 3 Plus
Strengths
- +Lighter by 9 lb
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –No major technical downsides compared to rival.
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
Neither covers a full weekend, and the gap is wide — 161% of the 1500's capacity against 241% of the Plus's. The Plus's answer to multi-day off-grid isn't holding more, it's refilling faster from the sun; pair it with panels rather than expecting either to coast through.
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
Neither unit
Neither unit covers this scenario's 1,645Wh: the DELTA 3 1500 comes up 339Wh short (about 79% covered), the DELTA 3 Plus 775Wh (53%). Either gets you most of the way, so this is a scenario you plan around rather than one you should rule them out 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 for eight hours, so both cover the night with room to spare and capacity decides nothing. Fan noise would — but DELTA 3 1500 doesn't publish a figure, so there's nothing to hold it to. Buy on price, weight, and whether you can live with a fan you haven't heard.
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 1500
The capacity break. A remote workday fits the 1500 at 70% of its tank but overruns the Plus at 105% — the smaller Plus battery can't finish a full day the 1500 handles with margin. If that's your real load, the bigger tank takes it outright.
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 1500
Both finish a tailgate comfortably — 51% of the 1500's capacity, 77% of the Plus's — so the load isn't the deciding factor. This one comes down to whether you'd rather carry the lighter Plus or keep the 1500's spare capacity and cash.
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 this scenario's 4,685Wh: the DELTA 3 1500 comes up 3,379Wh short (about 28% covered), the DELTA 3 Plus 3,815Wh (19%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
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 1500 runs 6.4h vs 4.2h.
$599 list · direct from EcoFlow
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 0–87hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–17.4hHigh-Draw Appliances
These reveal the real limitsscale 0–1.3h¹ 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 18, 2026
Verdict: the DELTA 3 1500
For most buyers the DELTA 3 1500 is the better deal: it holds 1,536Wh against the Plus's 1,024Wh, costs $100 less, and works out cheaper per lifetime kilowatt-hour at $0.13 against $0.17 — even though the Plus is rated for more cycles. It also wins every scenario that has a winner, because the bigger tank finishes more jobs. The Plus earns its higher price on exactly one axis that matters, and it's a big one for the right buyer: 1,000W of solar input against the 1500's 500W, which refills its smaller battery far faster off-grid. It's also 9 lbs lighter and switches over quicker as a UPS. But you pay $100 more for 512Wh less, and the Plus's headline flaw is real — reviewers repeatedly flag fans that cycle erratically even at low load, undercutting its quiet-UPS marketingB1B2. Buy the Plus if solar recharge or carry weight rules your decision. Otherwise the 1500 is more battery for less money.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 18, 2026. The links below open EcoFlow's current price.
$599.00 · direct from EcoFlow
Last checked 39 days ago. Prices move — check before you buy.
or check the DELTA 3 Plus price$669.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 18, 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 3 1500 rates 5.0/5 (99th percentile of 24 Everyday-class units), and DELTA 3 Plus rates 4.3/5 (61st percentile of 24 Everyday-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.
UPS Switchover: ≤10ms vs ≤15ms
Both list a UPS mode, at different rated speeds. The DELTA 3 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: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here.
Four Thousand Cycles Against Three
The Plus is rated for 4,000 charge cycles to the 1500's 3,000 — roughly 11 years of daily use against eight. It's the Plus's clearest durability edge. It just doesn't close the capacity gap: the 1500 still costs less per lifetime kilowatt-hour because it holds 512Wh more.
The Quiet One Won't Say How Quiet
The Plus advertises a 30dBA rating; the 1500 lists no noise figure at all. It's a strange pair — one unit's quiet is on paper, the other's is anyone's guess — and neither number should settle a decision your own ears will make in the first five minutes.
Full record above — the Test Desk pick is the DELTA 3 1500.
Check DELTA 3 1500 price →or check the DELTA 3 Plus priceOwnership 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 wins on both sticker price and long-term value. At $0.13/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. One caution on the lifespan row: the DELTA 3 Plus takes longer to reach its cycle rating, but a cycle moves a different amount of energy on each unit — the DELTA 3 1500 still delivers more over its shorter horizon (4,608 vs 4,096 kWh). Years measure wear, not usefulness.
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 Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 1,000W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
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 3 Plus's higher solar ceiling (1,000W vs 500W) 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 3 1500
The most-repeated owner observation about the 1500 is what it is under the hood: posters describe it as a Delta 2 / Delta 3 hybrid, carrying older UPS-cutover electronics in a new case with what one called larger grade-B cellsA3. It reads as the odd one out in the DELTA 3 line — neither the standard unit nor the Plus, but a bigger-battery variant stitched from both.
Past that, the field record is thin and a little unsettled. Idle draw is still debated, with no consensus on whether the 1500 received the firmware fix that lowered it on other Delta 3 unitsA4, and there are scattered early reliability complaintsA1A2. It's a newer SKU without much accumulated history, so treat its owner sentiment as preliminary rather than proven.
“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 Plus
The Plus is the better-documented unit, and the documentation keeps circling one flaw. It's marketed as near-silent, but reviewers consistently report the fans activating even under low loads and cycling on and off erratically, which undercuts its usefulness as a quiet UPSB1. The same erratic cycling raises the risk of the unit running hot under heavy loadsB2 — a real, repeatedly-cited quirk, not a one-off complaint.
Everything around that flaw is strong. Reviewers describe a well-designed unit with very fast recharge and a sub-10ms UPS handoff that keeps sensitive gear alive through an outageB3, and they expect EcoFlow can resolve the fan behavior in a software update, as it has on other stations after releaseB4. Buy it for the charging and the UPS; go in clear-eyed about the fans until that patch lands.
“Otherwise well-designed, with very fast recharge times and a seamless sub-10ms UPS switchover for uninterrupted power.”
Sources
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
- 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]
- The DELTA 3 Plus's headline weakness is fan behavior — fans run even at low load and cycle erratically, undercutting its quiet-UPS marketing. [DELTA 3 Plus · 3 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]
- B1
“Marketed as near-silent, but real-world fan performance is a significant flaw: the fans activate even under low loads and cycle on and off erratically, which limits its effectiveness as a quiet UPS.”
T3 — EcoFlow DELTA 3 Plus review: Lightning-fast charging with a noisy flaw; thesolarlab.com — DELTA 3 Plus Review · 2026 · [negative]
- B2
“Part of why it stays quiet is that the internal fans aren't always doing their job properly — the erratic cycling raises the risk of the unit overheating when running heavy loads.”
thesolarlab.com — EcoFlow DELTA 3 Plus Review: Amazing, but One Big Quirk? · 2026 · [negative]
- B3
“Otherwise well-designed, with very fast recharge times and a seamless sub-10ms UPS switchover for uninterrupted power.”
T3 / thesolarlab.com — DELTA 3 Plus reviews · 2026 · [positive]
- B4
“Reviewers note EcoFlow should be able to resolve the fan behavior with a software update, as it has done for other power stations after release.”
thesolarlab.com — DELTA 3 Plus Review · 2026 (dated claim — may be partially addressed by firmware) · [mixed]
Research compiled July 18, 2026.
Who Should Buy Which
Buy the DELTA 3 1500 if you…
- →Buyers who want the most battery per dollar — 1,536Wh for $599 and $0.13 a lifetime kilowatt-hour, the cheapest energy in this pair
- →Anyone whose loads need capacity past 1,024Wh, like a full remote workday the Plus can't finish
- →Wall-charging users who don't need the Plus's solar speed and would rather keep the $100 and the extra 512Wh
Buy the DELTA 3 Plus if you…
- →Solar-first and off-grid buyers who'll use the 1,000W input to refill fast — the Plus's one decisive edge
- →Anyone who carries the unit often and wants the lighter 27 lb build and the faster 10ms UPS cutover
- →Buyers who value the higher 4,000-cycle rating and can wait out or tolerate the reported fan behaviorB1 until a firmware fixB4
If neither fits
A full weekend of camping, an eight-hour whole-home blackout, or daily van-life draw defeats both — the 1500 needs up to 359% of its capacity, the Plus up to 538%. That's a larger unit's job; if you like the Plus's solar speed for that duty, plan on panels and expansion rather than expecting the base unit to coast.
The Bottom Line
The DELTA 3 1500 is the value pick and it isn't especially close: 512Wh more capacity than the Plus, $100 cheaper, and less per lifetime kilowatt-hour despite the Plus's higher cycle rating. It wins every scenario that capacity decides.
The Plus is worth its premium on one axis and a couple of nice-to-haves: 1,000W solar input that refills it in a fraction of the time off-grid, a lighter 27 lb build, and a faster UPS — set against 512Wh less storage and fan behavior that reviewers keep flagging against its own quiet marketingB1. Buy the Plus for the sun. Buy the 1500 for everything else.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
DELTA 3 1500 or DELTA 3 Plus — which should I buy?
The 1500 for most people: it holds 512Wh more, costs $100 less, and is cheaper per lifetime kilowatt-hour. Choose the Plus if you recharge from solar — its 1,000W input against the 1500's 500W refills far faster off-grid — or if the lighter 27 lb build and quicker UPS outweigh capacity for you.
Why does the DELTA 3 Plus cost more but hold less than the 1500?
You're paying for everything except capacity. The Plus adds 1,000W solar input, a 4,000-cycle rating, a 10ms UPS cutover, and a 9-lb-lighter build. The 1500 counters with 512Wh more storage at $100 less, which is why it's the cheaper unit both to buy and per kilowatt-hour.
Which recharges faster from solar, the DELTA 3 1500 or the Plus?
The Plus, decisively. It accepts 1,000W of solar against the 1500's 500W, and it's filling a smaller 1,024Wh battery, so it goes from empty to full in a fraction of the time off-grid. For anyone living off panels, that's the single strongest reason to pick the Plus.
Is the DELTA 3 Plus actually quiet?
Its 30dBA rating says so, but reviewers repeatedly report the fans running even at low load and cycling erratically, which contradicts the near-silent marketing. Reviewers think a firmware update could fix it. The 1500 publishes no noise figure at all, so neither unit is a safe pick if guaranteed quiet is your priority.
Which lasts longer, the DELTA 3 1500 or the DELTA 3 Plus?
The Plus on paper — 4,000 charge cycles and about 11 years of daily use against the 1500's 3,000 and 8.2 years. But the 1500 still costs less per lifetime kilowatt-hour, $0.13 against $0.17, because it stores 512Wh more per charge. More cycles, less energy each; the math favors the bigger battery.
Where to buy
EcoFlow DELTA 3 1500Pick
$599.00
$599.00 · direct from EcoFlow
Last checked 39 days ago. Prices move — check before you buy.
EcoFlow DELTA 3 Plus
$669.00
$669.00 · direct from EcoFlow
down from $719 · 7% below usual
Last checked 6 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.