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Head-to-head test

EcoFlow DELTA 2 vs EcoFlow DELTA 3

EcoFlow has stopped selling the DELTA 2 and points its buyers to the DELTA 3. Same battery size, same body, more surge and a longer-rated pack. An owner can keep what they have.

Full profiles: EcoFlow DELTA 2 β†’ Β· EcoFlow DELTA 3 β†’

Written by Ian SchneiderUpdated

Solar & Off-Grid Tester, Station Arena Test Desk

Stack these against 100+ rivals
MethodologyReader-supported β€” we may earn from links (details)

Spec deltas

Capacity
1,024Wh
matched
1,024Wh
Output
1,800W
matched
1,800W
Weight
27 lb
matched
27 lb
Typical price
No longer sold
$629
Cost / Wh
β€”
$0.61
Cycle life
3,000
4,000
Solar input
500W
matched
500W
01

EcoFlow has stopped selling the DELTA 2. Its store page now forwards to the DELTA 3, which EcoFlow calls the replacement. So this page is really for two people. One owns a DELTA 2 and wonders whether to upgrade. The other has found a used or clearance unit and wonders whether it's still a sensible buy.

On paper the DELTA 3 is the same box with some parts swapped. 1,024Wh, 1,800W continuous and 27 lbs on both, and both take EcoFlow's extra batteries. The changes are inside: a higher surge ceiling for motors, a battery rated for more cycles, and a quicker switchover when the grid drops.

My cabin in Truckee runs on solar, so the first spec I look for is the solar input. Both take 500W. Either one would refill from the same panels on my roof at the same pace. That leaves three differences to weigh, and none of them is capacity.

02

What the Numbers Reveal

Each conclusion stated first β€” the numbers behind it on one line, the full analysis below.

F1

Surge is the short burst an inverter can give while a motor starts. A fridge or a pump wants two to three times its running watts for that instant. The DELTA 3 clears the usual 2x rule of thumb. The DELTA 2 sits under it, though 2,700W still starts plenty.

the DELTA 3 surges to 3,600W (2x its rating); the DELTA 2 surges to 2,700W (1.5x)both run 1,800W continuousmotors briefly draw two to three times their running watts at startup

Why it mattersIf your heaviest motor already starts on a DELTA 2, the extra surge buys you nothing you'd notice.

F2

The DELTA 2's fans reportedly wake past 120WA1. The DELTA 3's reportedly stay off below 200WB1. A laptop and a router live in that window. The published 50dB and 30dB ratings can't settle it alone, since EcoFlow's two figures may not describe the same conditions.

DELTA 2 fans switch on above 120W and run loud near maximum loadA1DELTA 3 fans often stay off under 200WB1EcoFlow rates the DELTA 2 at 50dB and the DELTA 3 at 30dB; the two ratings may not describe the same conditions

Why it mattersFor a bedroom or a quiet evening at a desk, the DELTA 3 is the calmer box, with the reports still earlyB0.

F3

rated cycles

A 3,000-cycle rating is more than eight years of daily use before the pack starts to fade. On a used unit, how hard it has been worked matters more than which generation it is. I'd ask the seller, and I'd listen to it under load before paying.

the DELTA 2 is rated for 3,000 cycles and the DELTA 3 for 4,000both hold 1,024Wh and both accept EcoFlow expansion batteriesa reviewer ran the DELTA 2 through 18 months of outages, camping and home-office useA3

Why it mattersOwners can keep their DELTA 2. Used buyers should judge one on its condition, because the hardware underneath is close to the DELTA 3's.

The specific dimensions that decide these two units β€” everything else is a tie.

Lifetime Value

Selected because: Same capacity, different cycle ratings, and only one of the two has a new price.

Both batteries hold 1,024Wh. The DELTA 3's is rated for 4,000 cycles and the DELTA 2's for 3,000. Cycled every day, that's about 11 years against 8.2. On weekend duty, both outlive the five-year warranty many times over.

New, the DELTA 3 works out to $0.15 per lifetime kWh. The DELTA 2 has no new price to set against it, because EcoFlow no longer sells it. On a used one, the useful question is how many of its rated cycles are already gone.

What the Specs Don't Tell You

Selected because: Surge, switchover and fan noise are the real differences; warranty is a tie.

rated cycles

Five cards fire on this pair. Warranty is a tie at five years. Surge, switchover and cycle life all go the DELTA 3's way. The surge card matters most for motors. A compressor that stalls at 2,700W may start at 3,600W.

The noise card needs care. EcoFlow rates the DELTA 2 at 50dB and the DELTA 3 at 30dB, but the two figures may not describe the same operating conditions. The field reports are more useful. The DELTA 2's fans reportedly come on past 120WA1, and the DELTA 3's reportedly stay off under light loadB1.

Your Life, Your Pick

Selected because: Every row lands identically, so the useful part is which jobs 1,024Wh covers.

The two hold the same energy, so every row lands on the same percentage. A CPAP night uses about 37% of either. A tailgate fits with 200Wh to spare. A full remote workday misses by 40Wh, which one trimmed appliance fixes.

The eight-hour blackout is the row I'd plan around. It wants 1,645Wh, and each unit comes up 775Wh short. A new base unit doesn't change that. If I owned a DELTA 2, I'd put the upgrade money toward an EcoFlow extra battery instead.

Growth Path

Selected because: Both expand the same way, which matters most to an owner deciding whether to stay put.

Both grow the same way. Each takes EcoFlow's extra batteries to climb past 1,024Wh, and both cap solar at 500W. On the growth path they're a tie.

That tie favours the owner who stays put, since an existing DELTA 2 can still grow. A buyer starting fresh will find the DELTA 3 is the base EcoFlow still sells.

Strengths & trade-offs

EcoFlow DELTA 2

Strengths

  • Solid all-rounder with standard specs.

Trade-offs

  • –Shorter-lived battery β€” rated for 3,000 charge cycles vs the DELTA 3's 4,000, so it wears out sooner.

EcoFlow DELTA 3

Strengths

  • +Rated for 4,000 charge cycles β€” much longer battery lifespan

Trade-offs

  • –No major technical downsides compared to rival.
03

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 Β· 2 nights Β· needs 2,100Wh

Weekend Camping

Two nights off-grid with essential comfort

Neither unit

Two nights want 2,100Wh, and either unit comes up 1,230Wh short. Both refill from 500W of solar at the same rate, so a sunny afternoon helps them equally.

Camping power station guide β†’

Battery budget usedlower = more headroom

LOADΒ Β Phone Charger 15WΓ—6h Β· LED Lights 40WΓ—8h Β· Box Fan 75WΓ—14h Β· CPAP Machine 40WΓ—16h

SCN-02 Β· 8 hours Β· needs 1,645Wh

8-Hour Blackout

Keep the essentials running through a night without power

Neither unit

Each comes up 775Wh short of the 1,645Wh night. An EcoFlow extra battery closes the gap on either. The DELTA 3's faster rated switchover is the only difference when the grid drops.

Emergency blackout power guide β†’

Battery budget usedlower = more headroom

LOADΒ Β Fridge 150WΓ—8h Β· Router + Modem 20WΓ—8h Β· LED Lights (4 bulbs) 40WΓ—6h Β· Phone Charger 15WΓ—3h

SCN-03 Β· 8 hours Β· needs 320Wh

CPAP Overnight

Sleep therapy without interruption β€” the #1 medical use case

Either unit

A 40W CPAP for eight hours uses about 37% of either, with 550Wh left by morning. Capacity isn't the question. The published noise ratings can't say which is quieter at that draw, and only the DELTA 3 is still sold new.

Battery budget usedlower = more headroom

LOADΒ Β CPAP Machine 40WΓ—8h

SCN-04 Β· 8 hours Β· needs 910Wh

Remote Workday

Full work day off-grid without power anxiety

Neither unit

A 910Wh desk day misses by 40Wh on both. Let the laptop run on its own battery for the last hour and either one gets there.

UPS & desk backup guide β†’

Battery budget usedlower = more headroom

LOADΒ Β Laptop 60WΓ—8h Β· External Monitor 30WΓ—8h Β· Router + Modem 20WΓ—8h Β· Phone Charger 15WΓ—2h

SCN-05 Β· 4 hours Β· needs 670Wh

Tailgate Party

Game day power for the crew

Either unit

Both carry the 670Wh day with 200Wh to spare, at the same 27 lbs. Only the DELTA 3 is still sold new, so it's the one to plan around.

Battery budget usedlower = more headroom

LOADΒ Β Blender 400WΓ—0.5h Β· LED TV (55") 80WΓ—4h Β· Bluetooth Speaker 15WΓ—4h Β· Phone Charger (Γ—3) 45WΓ—2h

SCN-06 Β· 24 hours Β· needs 4,685Wh

Van Life Daily

A full day of mobile living β€” the ultimate endurance test

Neither unit

A van-life day wants 4,685Wh, more than four times what either holds. That's a job for a larger station, not a choice between these two.

Battery budget usedlower = more headroom

LOADΒ Β Mini-Fridge 150WΓ—24h Β· Laptop 60WΓ—4h Β· Phone Charger 15WΓ—3h Β· LED Lights 40WΓ—5h Β· Fan 75WΓ—8h

The Load Test

RUNTIME = (Wh Γ— 0.85) Γ· 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

DELTA 24.2h
dead in 4.2h β€” before your 8h window ends
DELTA 34.2h
dead in 4.2h β€” before your 8h window ends

Dead heat β€” both run this 205W load for roughly 4.2h. Pick on price, weight, or ports.

Planning for more than this? Describe your whole setup and get it sizedΒ β†’

Modeled from the spec record β€” same math as the tables below. Methodology

Runtime by appliance

Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.ΒΉ

Essentials

The basics you need runningscale 0–58h
ApplianceDELTA 2DELTA 3
CPAP Machine40W draw
DELTA 2 & DELTA 3: 21.8h Β· same2 full nights
Phone Charger15W draw
DELTA 2 & DELTA 3: 58h Β· same
Router + Modem20W draw
DELTA 2 & DELTA 3: 43.5h Β· same
Starlink75W draw
DELTA 2 & DELTA 3: 11.6h Β· same
LED Lights (4 bulbs)40W draw
DELTA 2 & DELTA 3: 21.8h Β· same
Laptop (Working)60W draw
DELTA 2 & DELTA 3: 14.5h Β· same

Comfort & Convenience

Makes off-grid life actually enjoyablescale 0–11.6h
ApplianceDELTA 2DELTA 3
Box Fan75W draw
DELTA 2 & DELTA 3: 11.6h Β· same
LED TV (55")80W draw
DELTA 2 & DELTA 3: 10.9h Β· same
Mini-Fridge150W draw
DELTA 2 & DELTA 3: 5.8h Β· same
Electric Blanket200W draw
DELTA 2 & DELTA 3: 4.4h Β· same0 full nights

High-Draw Appliances

These reveal the real limitsscale 0–0.9h
ApplianceDELTA 2DELTA 3
Coffee Maker1000W draw
DELTA 2 & DELTA 3: 0.9h Β· same
Microwave1200W draw
DELTA 2 & DELTA 3: 0.7h Β· same
Space Heater1500W draw
DELTA 2 & DELTA 3: 0.6h Β· same

ΒΉ Runtime = (capacity Γ— 0.85) Γ· 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 β€” see methodology.

Conclusion

October 25, 2026

Verdict: the EcoFlow DELTA 3

Buy the DELTA 3. EcoFlow no longer sells the DELTA 2 and names the DELTA 3 as its replacement. The two share 1,024Wh, 1,800W continuous output, 500W of solar input, a 27 lb body and a five-year warranty. The DELTA 3 adds a 3,600W surge ceiling to the DELTA 2's 2,700W, a 4,000-cycle rating against 3,000, and a switchover rated at 10ms or less instead of 20ms or less. Reviewers' main complaint about the DELTA 2 is fan noise once loads climbA1, and the DELTA 3's fans reportedly stay off under light loadB1. A DELTA 2 owner has little reason to switch; the DELTA 3 is the one to buy new.

Today the DELTA 3 is $599, $30 under its typical $629. The verdict weighs typical prices, not today's. Prices checked 28 days ago.

β– β– β– β– β– β– β– β– β– β–‘9/10

Editor-assigned confidence, based on cited owner research and spec analysis.

List prices as of October 25, 2026. The links below open EcoFlow's current price.

Check DELTA 3 price

$599.00 Β· direct from EcoFlow

down from $629 Β· 5% below usual

Last checked 28 days ago. Prices move β€” check before you buy.

Written by Ian Schneider, Solar & Off-Grid Tester Β· Station Arena Test Desk Β· Updated October 25, 2026

Black Friday Β· 26 days out

Price to beat:DELTA 3 $519

The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.

EcoFlow Black Friday deals β†’
04

Measured Data

Benchmark scores and the full spec record, side by side.

Benchmark scores

DELTA 2DELTA 3
Overall Power Score
2,994
3,017
UPSResponse & Reliability
2,718
3,436
RV LivingEnergy Density & Output
2,793
2,826
Home BackupCapacity & Resilience
2,918
3,171
CPAPSleep Therapy Reliability
2,721
3,476
Solar GeneratorSolar Input & Efficiency
2,684
2,622
TailgatingOutlets & Portability
2,936
2,783
Food TruckSustained Heavy Output
2,931
2,888
Apartment BalconyCompact Solar Living
2,814
2,797
CampingLightweight & Versatile
2,627
2,661

Full specifications

DELTA 2
No longer sold
DELTA 3
$599β˜… our pick
Updated Oct 25
See live price β†’
Capacity (Wh)
1024
1024
Output (W)
1800
1800
Surge Peak
2700W
3600W
AC Outlets
6
6
240V Outlets
0
0
30A RV Outlets
0
0

ᡈ Derived: price Γ· rated capacity. See the data behind our comparisons β†’

Comparison ToolAdd more power stations, side by sideOpen Tool β†’
How these numbers are produced

Numeric verification

Every figure on this page traces to our spec database or arithmetic on it β€” no estimated numbers.

Owner claims

Statements about owner experience are cited to published reviews β€” see Sources & Research Notes below.

Runtime model

Runtime = (rated capacity Γ— 0.85 inverter efficiency) Γ· 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 β†’

Class ranking (the star rating)

Each unit's star score is a category ranking, not customer reviews β€” 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 5β˜…. Here, DELTA 2 rates 4.1/5 (50th percentile of 27 Everyday-class units), and DELTA 3 rates 4.5/5 (73rd percentile of 27 Everyday-class units).

How the class ranking is computed β†’

Test Notes & Caveats

Hidden gotchas and advantages we spotted that you won't find on the product page.

[NOTE]

Two ratings, one complaint

EcoFlow rates the DELTA 2 at 50dB and the DELTA 3 at 30dB. The two figures may not describe the same operating conditions, so read them as a hint. Field reports put the DELTA 2's fans on above about 120W, and the DELTA 3's often off under 200W.

[ADVANTAGE]

More headroom for motors

Both run 1,800W continuous. The DELTA 3 surges to 3,600W, double its rating, and the DELTA 2 to 2,700W. Fridges, pumps and power tools pull two to three times their running watts for the first instant, so the DELTA 3 is more likely to start a stubborn compressor. If yours already starts on a DELTA 2, nothing changes.

[NOTE]

A quicker rated handoff

The DELTA 3 is rated to switch to battery in 10ms or less, the DELTA 2 in 20ms or less. Both are ceilings, not lab results. A laptop won't notice either. A desktop or a NAS without its own battery is where the faster rating helps.

[NOTE]

Warranty: No Difference

Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here.

[NOTE]

Battery Lifespan in Real Years

The DELTA 3 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. After hitting the cycle limit, the battery doesn't die β€” it drops to ~80% of original capacity, which is still very usable.

Full record above β€” the Test Desk pick is the DELTA 3.

Check DELTA 3 price β†’
05

Ownership Analysis

What happens after you buy β€” true cost of ownership, brand trust, and growth potential.

Lifetime value

DELTA 2DELTA 3

β”‚ warranty ends Β· Reaching the cycle rating means ~80% capacity remains β€” degraded, not dead.

DELTA 2
DELTA 3
Purchase price
No longer sold
$599.00
Lifetime energy delivered
3,072 kWh
4,096 kWh
Cost per lifetime kWh
β€”
$0.15
Cost per warranty year
β€”
$126/yr
Battery lifespan
8.2yr daily Β· 28.8yr weekends Β· 57.7yr weekly
11yr daily Β· 38.5yr weekends Β· 76.9yr weekly

Analyst note

The DELTA 2 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 works out at $0.15/kWh over its rated life. If you already own the DELTA 2, the hardware comparison still holds: over its rated life the DELTA 2 delivers about 3,072 kWh and the DELTA 3 about 4,096 kWh.

Growth path

DELTA 2

EXPANDABLE

Supports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β€” useful if your needs may climb past 1,024Wh.

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

EXPANDABLE

Supports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β€” useful if your needs may climb past 1,024Wh.

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 2DELTA 3

Analyst note

Growth only counts if you can still buy in, and the DELTA 2 is no longer sold, replaced by the DELTA 3 beside it. That leaves the DELTA 3: it starts at 1,024Wh and takes EcoFlow expansion batteries, so the ceiling moves if your needs do. The DELTA 2's expandability still matters if you already own one, but it isn't a reason to pick it over the DELTA 3.

06

What Owners Report

Patterns from published owner reports and long-term reviews β€” every claim cited to its source below.

EcoFlow DELTA 2

The DELTA 2 has a long file. One reviewer ran it through 18 months of outages, camping trips and home-office days, and came away praising its fast charging, its LFP battery and its expansion pathA3. LFP is lithium iron phosphate, a chemistry chosen for long life.

The recurring gripe is the fans. Testers report them switching on above 120W and running loud near maximum load, enough to make a bedroom awkward for medical gearA1. At fast charging speeds one review compared them to a gaming laptop, though the app can slow the charge to quiet themA2. EcoFlow said it planned a firmware fixA4.

β€œWhen charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
β€” PCWorld β€” EcoFlow Delta 2 power station review, 2026

Sources

portablepowerlab.com

EcoFlow DELTA 3

Field data on the standard DELTA 3 is thin. Most testing so far covers its Plus, Max and Ultra siblings, so our research treats owner sentiment as preliminaryB0.

What exists is about quiet. Reviewers report the fans often staying off under 200W and barely audible at moderate loadB1. On the thing DELTA 2 owners complained about most, the early signs are good. They are also early.

β€œAt low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”
β€” portablepowernerd.com β€” EcoFlow Delta 3 Tested: 2026 Hands-On Review; thesolarlab.com, 2026

Sources

portablepowernerd.com Β· thesolarlab.com Β· outputreport.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

  • Fan noise under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 Β· 3 entries]
  • A1

    β€œFans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”

    portablepowerlab.com β€” EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld β€” EcoFlow Delta 2 review Β· 2026 Β· [negative]

  • A2

    β€œWhen charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”

    PCWorld β€” EcoFlow Delta 2 power station review Β· 2026 Β· [mixed]

  • A3

    β€œAfter 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”

    portablepowerlab.com β€” EcoFlow Delta 2 Review: 6 Months of Real Use Β· 2026 Β· [positive]

  • A4

    β€œEcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”

    portablepowerlab.com β€” EcoFlow Delta 2 Review Β· 2026 (dated claim β€” may be partially addressed) Β· [mixed]

  • B1

    β€œAt low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”

    portablepowernerd.com β€” EcoFlow Delta 3 Tested: 2026 Hands-On Review; thesolarlab.com Β· 2026 Β· [positive]

Research compiled October 25, 2026.

07

What Owners Actually Report

Drawn from 181 comments on independent review channels β€” not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.

EcoFlow DELTA 2

224 claims from 155 comments Β· 178 from owners Β· 60 with figures

Runtime
32 Β· 13% negative
Price & value
38 Β· 4% negative
Charging
17 Β· 23% negative
Durability
22 Β· 67% negative
Warranty & support
22 Β· 59% negative

What owners complain about

  • Ignores solar unless he unplugs it from the wall, so he switched to the AC180.

    Solar inputowner63 agreedsource β†’

  • His Delta 2 went bad three months after purchase and EcoFlow agreed it was defective.

    Durabilityownerafter 3 months236 agreedsource β†’

  • Past 30 days the five-year warranty only gets a refurbished unit covered for 30 days.

    Warranty & supportowner236 agreedsource β†’

What owners praise

  • DELTA 2 plus extra battery and 600W solar cost ~$1200 and paid for itself in under 2 years in California.

    Price & valuemeasuredowner736 agreedsource β†’

  • Batteries still hold 98%+ capacity, ahead of the 80%-at-10-years warranty curve.

    Durabilitymeasuredowner736 agreedsource β†’

  • Gets 180-190W into it from a 100Ah LiFePO4 via XT60i cable, no converter needed.

    Chargingmeasuredowner106 agreedsource β†’

EcoFlow DELTA 3

34 claims from 26 comments Β· 17 from owners Β· 7 with figures

Solar input
5 Β· 27% negative
Runtime
3 Β· 66% negative
Price & value
4 Β· 11% negative
Build quality
2 Β· 100% negative
Inverter & surge
2 Β· 0% negative

What owners complain about

  • At 30% charge it ran a 12V cool box for only 30 minutes against a claimed 12 hours at full charge.

    Runtimemeasuredowner1 agreedsource β†’

  • AC-port surge protection is rated only 150 joules versus 1,800 on his UPS, so he chained both.

    Build qualitymeasuredownersource β†’

  • Four 12V 100W panels in series give an overload error despite a 60V input rating.

    Solar inputmeasuredownersource β†’

What owners praise

  • The same pressure washer ran on their DELTA 3 with no errors.

    Inverter & surgemeasuredowner1 agreedsource β†’

  • Charges 0-100% in 1 hour on 1,000W of solar; 800W takes only 20 minutes longer.

    Solar inputmeasuredowner1 agreedsource β†’

  • Bought a DELTA 3 from a Costco sale for $389 to replace a 1500VA UPS.

    Price & valuemeasuredownersource β†’

Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results β€” for measurements we ran ourselves, see the methodology.

08

Who Should Buy Which

Buy the DELTA 2 if you…

  • β†’You already own one. It has the same capacity, inverter rating and solar input as its successor, plus long reviewer testing behind itA3.
  • β†’You've found a used or clearance unit in good condition at a price that beats a new DELTA 3 by enough to matter. Ask how hard it has been worked, and confirm who honours the warranty, since EcoFlow no longer lists it.
  • β†’Your loads stay light, so the fans rarely wakeA1, and 2,700W of surge is plenty for what you run.

Buy the DELTA 3 if you…

  • β†’You're buying new. The DELTA 2 is no longer sold, and the DELTA 3 is EcoFlow's named replacement.
  • β†’You need to start a compressor, such as a fridge, a freezer or a pump, that wants more than the DELTA 2's 2,700W surge.
  • β†’It'll run near a bed or a desk, where early reports of fans staying off under light load matterB1.
  • β†’You're protecting a desktop or a NAS, a small home file server, where a switchover rated at 10ms or less is the safer side of the line.

This is you β€” check the DELTA 3 price

If neither fits

You need a full blackout night or a weekend off-grid from the base unit alone. Both hold 1,024Wh and both come up short on those. Add an EcoFlow extra battery, or step up to a larger station.

09

The Bottom Line

If you're buying new, buy the DELTA 3. The DELTA 2 has left EcoFlow's range, and its replacement is the same 1,024Wh, 1,800W box with more surge, a longer-rated battery and a quicker rated switchover. Early reports say it's quieter at light loads tooB1.

If you already own a DELTA 2, it still does the job it did yesterday. Upgrade only if a motor won't start on it or the fans keep you upA1. A used one in good shape is a fair buy, as long as the price allows for a battery that has already spent some of its cycles.

10

Frequently Asked Questions

Answers drawn from the spec record and cited owner research.

Is the EcoFlow DELTA 2 discontinued?

Yes. EcoFlow no longer sells the DELTA 2, and its store page forwards to the DELTA 3, which EcoFlow names as the replacement. Some retailers may still have stock.

EcoFlow DELTA 2 or DELTA 3: which should I buy?

The DELTA 3, if you're buying new. It matches the DELTA 2's 1,024Wh and 1,800W continuous output and adds a 3,600W surge ceiling against 2,700W, a 4,000-cycle rating against 3,000, and a switchover rated at 10ms or less instead of 20ms or less. The DELTA 2 is no longer sold new.

Should I upgrade my DELTA 2 to a DELTA 3?

Only if you need what changed. Capacity, continuous output, solar input and weight are the same. You'd gain surge headroom for motors, a faster rated switchover and, by early reports, quieter fans under light load. If you want more runtime, an EcoFlow extra battery adds it and a new base unit does not.

Is the DELTA 3 quieter than the DELTA 2?

By reviewers' accounts, yes. The DELTA 2's fans reportedly switch on above about 120W, while the DELTA 3's often stay off under 200W. EcoFlow rates them at 50dB and 30dB, but those ratings may not describe the same conditions, so treat them as a guide rather than a measured gap.

Can either run my house during a blackout?

Not on the base unit alone. An eight-hour blackout load of about 1,645Wh leaves either one 775Wh short. Both accept EcoFlow expansion batteries, so a base plus a battery is the practical setup.

Check DELTA 3 price β†’

Where to buy

DELTA 2

EcoFlow DELTA 2

No longer sold

DELTA 3

EcoFlow DELTA 3Pick

$599.00

Check current price

$599.00 Β· direct from EcoFlow

down from $629 Β· 5% below usual

Last checked 28 days ago. Prices move β€” check before you buy.

Prices may vary by retailer and are subject to change.

No longer soldDELTA 2