Head-to-head test
EcoFlow DELTA 2 Max vs EcoFlow DELTA 3800 Gen4One Ends a Blackout Night Nearly Empty. Is the Other Worth It?
One of these finishes a blackout night nearly empty, and the other keeps most of a second night and takes twice the solar to refill. I'd buy the DELTA 4 (3800) for a house on solar, and the DELTA 2 Max if one night is all you plan for.
Black Friday · 23 days out
Price to beat:DELTA 2 Max $949
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 2 Max → · EcoFlow DELTA 3800 Gen4 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunner’s take
Whole-Home Backup Tester
After one eight-hour blackout, the DELTA 2 Max is nearly out.
The night needs 1,645 Wh. The DELTA 2 Max finishes with 96 Wh. The DELTA 4 (3800) finishes with 1,554 Wh, 94% of a second night, before the sun is even up.
The morning is where the second solar input pays.
The DELTA 4 (3800) takes 2,000 W of solar across two inputsB5, against 1,000 W on the DELTA 2 Max. It starts the day with more in hand and can refill twice as fast, if you own the panels to feed both inputs. It also weighs 67.5 lb to the DELTA 2 Max's 50.7, which is 16.8 lb you'll feel on any stairs.
That much more box costs more than double.
EcoFlow lists the DELTA 4 (3800) at $2,199 on its US storeB10, against $1,049 for the DELTA 2 Max. Per watt-hour it's a little dearer. What the gap buys is the second night, the second solar input, a 3,600 W inverter and twice the rated cycles.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
The DELTA 2 Max has to refill nearly all of its battery through 1,000 W before the next evening. The DELTA 4 (3800) starts the day with most of a night in hand and can take twice the panel watts. A run of grey days hurts it far less, because it has less to make up and a wider pipe to make it up through.
8-Hour Blackout needs 1,645 Wh: the DELTA 2 Max ends with 96 Wh, the DELTA 4 (3800) with 1,554 WhDELTA 4 (3800): two solar inputs, 11 to 60 V, 1,000 W eachB5DELTA 2 Max: 1,000 W of solar input
Why it mattersIf outages where you live run past one night and solar is the plan, this is the chain that decides it.
cost / lifetime kWh
Which of those numbers matters depends on how often the battery empties. A box on standby for storms never cashes in its cycle rating, so for that buyer the gap pays for the second night and nothing else. A box on solar duty every day does cash it in, and then the bigger unit is the cheaper one.
DELTA 2 Max: 2,048 Wh at $1,049DELTA 4 (3800): 3,763 Wh at $2,199, rated for twice the DELTA 2 Max's cyclesLifetime cost: $0.10 per kWh for the DELTA 4 (3800), $0.17 for the DELTA 2 Max
Why it mattersDecide on whether you need 3,763 Wh. If you'll cycle it daily, the price gap partly pays itself back.
weight
A tailgate uses about a fifth of the bigger box, and the DELTA 2 Max handles it with most of its battery left. The DELTA 2 Max also has the car socket a 12 V fridge-cooler plugs into. Away from home the extra capacity is just extra weight from the trunk. At home it's the second night.
DELTA 4 (3800): 67.5 lb, a handle at each end, folding cart sold separatelyB7DELTA 2 Max: 50.7 lb, with a 12 V car socket the DELTA 4 (3800) lacksTailgate Party needs 670 Wh: 38% of the DELTA 2 Max, 21% of the DELTA 4 (3800)
Why it mattersIf the box mostly travels, the DELTA 2 Max is the easier companion. If it mostly lives beside the fridge, the weight stops mattering after the first day.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Both get through an eight-hour blackout, and only the DELTA 4 (3800) has most of a second night left.
The DELTA 2 Max survives the night and wakes up broke. The eight-hour blackout needs 1,645 Wh. It finishes with 96 Wh left, 6% of a second night. The DELTA 4 (3800) finishes with 1,554 Wh, enough that a cloudy morning is an annoyance rather than a problem.
The camping weekend splits them the same way. The DELTA 2 Max comes up 359 Wh short of the 2,100 Wh weekend, and the DELTA 4 (3800) has 1,099 Wh to spare. Van Life Daily at 4,685 Wh beats both, though the bigger box gets within 1,486 Wh on its own battery.
Growth Path
Selected because: Both take extra batteries, and the DELTA 4 (3800) refills its bank through 2,000 W of solar against 1,000 W.
solar input
One extra battery adds a whole DELTA 2 Max's worth of storage. The DELTA 4 (3800) takes EcoFlow's DELTA 3 Max Plus extra battery, which holds 2,048 WhB6, the same as the DELTA 2 Max's entire battery. With one attached EcoFlow counts 6 kWh in allB10, and it quotes 4 to 12 kWh across what the port supportsB6.
The DELTA 2 Max grows too, behind a narrower pipe. Every battery you add to it fills through the same 1,000 W of solar. The DELTA 4 (3800) has two inputs at 1,000 W eachB5, each taking 11 to 60 V. Check your panels' Voc, the open-circuit voltage printed on the back, before you count watts.
Portability & Form Factor
Selected because: 67.5 lb against 50.7 lb, for 1,715 Wh more battery.
weight
The DELTA 4 (3800) is a lift you plan. At 67.5 lb with a handle at each endB7, it's a two-hand carry with a straight back, and a short one. The DELTA 2 Max at 50.7 lb is the one I'd put in the truck for a weekend without thinking twice.
For a box that lives by the fridge, the weight stops mattering. EcoFlow sells a folding cart for the DELTA 4 separatelyB7. If it moves once a season, 16.8 lb more buys 1,715 Wh more battery, and I'd take that trade.
What the Specs Don't Tell You
Selected because: Switchover is rated no worse than 10 ms against 20 ms, and only the DELTA 2 Max has a car socket.
rated cycles
Car campers give something up on the DELTA 4 (3800). It has no 12 V car socketB3, the round port a 12 V fridge-cooler plugs into, and the DELTA 2 Max has one. The DELTA 4 answers with a 140 W USB-C port against the DELTA 2 Max's 100 W, which matters for a laptop that can draw more.
A PC on the backup circuit is happier on the DELTA 4 (3800). Its switchover is rated no worse than 10 ms against no worse than 20 ms on the DELTA 2 Max. Neither is a lab measurement, and a router rides through either.
In the makers’ pictures
What you’d actually be living with
Every port, labelled
What plugs in where, and how much it takes
EcoFlow DELTA 2 Max
Front panel
- 12× USB-A · 12 WOutTwo USB-A ports, 5 V at 2.4 A, 12 W max each, by EcoFlow’s specs.
- 22× USB-A fast · 18 WOutTwo blue USB-A ports printed FAST CHARGE: 5 V at 2.4 A, 9 V at 2 A or 12 V at 1.5 A, 18 W max each, by EcoFlow’s specs.
- 3USB-C · 100 WOutUp to 100 W (up to 20 V at 5 A), printed on the panel and in EcoFlow’s specs. A USB ON/OFF switch sits between the two USB-C ports.
- 4USB-C · 100 WOutThe second USB-C port, also up to 100 W.
The AC outlets, DC outputs and inputs are on the rear, and the battery ports on the side, mapped below.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s panel; ratings from the specs on EcoFlow’s US store page for the DELTA 2 Max.
Rear panel
- 12× Solar/car in · 1,000 WInTwo XT60 inputs under the flap, marked SOLAR/CAR INPUT on its cover: 11–60 V, 15 A, 500 W on one port and 1,000 W on both, by EcoFlow’s specs. They also charge from a 12 or 24 V car battery at 8 A.
- 2AC in · 1,800 WInThe AC inlet, marked X-STREAM CHARGE: 100–120 V, 15 A max, charging at up to 1,800 W by EcoFlow’s specs.
- 3Charge-speed switchInSets the AC charging speed, printed AC CHARGE SPEED. An overload-protection button printed 20A MAX sits below it.
- 46× 120 V outletsOutSix T-slot outlets sharing 2,400 W and a 4,800 W surge, switched by the AC ON/OFF switch below them. X-Boost runs heaters up to 3,400 W, by EcoFlow’s specs.
- 52× DC5521 · 38 WOutTwo DC barrel ports printed 3A MAX: 12.6 V at 3 A, 38 W max each, by EcoFlow’s specs.
- 612 V car socket · 10 AOutA capped 12 V car socket rated 12.6 V, 10 A, 126 W by EcoFlow’s specs, switched with the DC outputs by the 12V ON/OFF switch.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s panel and flap; ratings from the specs on EcoFlow’s US store page for the DELTA 2 Max.
Battery-port side
- 12× Battery portsIn · OutTwo covered ports on the side. EcoFlow says the DELTA 2 Max takes up to two DELTA 2 Max or DELTA Max Smart Extra Batteries.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. The ports read by us from EcoFlow’s picture; the batteries they take from the specs on EcoFlow’s US store page.
EcoFlow DELTA 3800 Gen4
Front panel
- 1USB-C · 140 WOutUp to 140 W (USB-PD up to 28 V at 5 A). The port for a laptop.
- 22× USB-C · 65 WOutUp to 65 W each. EcoFlow says these two and the USB-A share 16 W when two or more are in use at once.
- 3USB-A · 36 WOutUp to 36 W (5, 9 or 12 V at 3 A).
- 430 A twist-lockOutA three-slot twist-lock marked 30A MAX, rated 30 A at 120 V on the US unit.
- 54× 20 A outletsOutFour T-slot 120 V outlets rated 20 A each, sharing 3,600 W continuous and a 7,200 W surge.
Photo: EcoFlow · Product image, EcoFlow Japan store · numbers and labels are ours. Ratings from EcoFlow’s US spec table; outlet shapes read by us from EcoFlow’s picture, taken of the Japanese unit, which shares the US panel.
Input side
- 12× Solar/DC in · 1,000 WInTwo inputs, each 11 to 60 V, up to 20 A, 1,000 W: 2,000 W of panels in all.
- 2AC in · 1,800 WIn100–120 V at 15 A. Charges at up to 1,800 W, which at 120 V is the whole of an ordinary 15 A circuit.
- 3Battery portIn · OutTakes up to two of EcoFlow’s DELTA 3 Max Plus or DELTA Pro 3 extra batteries; EcoFlow quotes 4–12 kWh.
Photo: EcoFlow · Product image, EcoFlow Japan store · numbers and labels are ours. Ratings from EcoFlow’s US spec table and the panel’s own printing.
Strengths & trade-offs
EcoFlow DELTA 2 Max
Strengths
- +Costs $1,150 less
- +Lighter by 16.8 lb
Trade-offs
- –Weaker inverter (-1,200W) limits appliance compatibility.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA 3800 Gen4's 6,000, so it wears out sooner.
EcoFlow DELTA 3800 Gen4
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$1,150) than the DELTA 2 Max.
- –Significantly heavier (+16.8 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 3800 Gen4
The DELTA 2 Max doesn't finish — 1,741Wh usable against the 2,100Wh this needs leaves it 359Wh short, about 83% of the scenario covered. The DELTA 3800 Gen4 covers it with 1,099Wh 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 3800 Gen4
Both get through the night. The DELTA 2 Max ends it with 96 Wh, and the DELTA 4 (3800) with 1,554 Wh, nearly a whole second night.
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 320 Wh night is a small slice of either battery. The noise ratings can't break the tie: the DELTA 2 Max publishes a best-case floor, and EcoFlow rates the DELTA 4 (3800) as a ceiling under loads far heavier than a CPAP's 40 W. For a bedside box, the lighter DELTA 2 Max is the easier one to live with.
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 3800 Gen4
The DELTA 3800 Gen4 clears the workday at 28% used, banking 2,289Wh — late work, extra calls, or a second laptop charge without arithmetic. The DELTA 2 Max at 52% also finishes, with 831Wh 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 3800 Gen4
Both handle game day; the DELTA 3800 Gen4 keeps more in reserve (21% used vs 38%). Tailgating is a light load, though, so the number you'll feel is weight: 50.7 lbs for the DELTA 2 Max against 67.5 lbs for the DELTA 3800 Gen4, 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 covers 4,685 Wh on its own battery. The DELTA 4 (3800) gets closest at 1,486 Wh short, and both take extra batteries to close the rest.
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 3800 Gen4 runs 15.6h vs 8.5h.
$2,199 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 0–213.2hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–42.6hHigh-Draw Appliances
These reveal the real limitsscale 0–3.2h¹ 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
November 4, 2026
Verdict: the DELTA 3800 Gen4, on Power Score margin
For a house that rides out long outages on solar, I'd buy the DELTA 4 (3800). It holds 3,763 Wh to 2,048 Wh, takes 2,000 W of solar across two inputs to 1,000 WB5, and comes out of an eight-hour blackout with 1,554 Wh left against 96. Both take extra batteries, so growth doesn't split them. It costs $1,150 more and a little more per watt-hour, but it's rated for twice the cycles, so per lifetime kWh it's the cheaper one to own. The price is why my confidence stops at five: if one night is the longest outage you plan for, the DELTA 2 Max does that job for less than half the money.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of November 4, 2026. The links below open EcoFlow's current price.
$2,199.00 · direct from EcoFlow
or check the DELTA 2 Max price$1,029.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated November 4, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): CPAP.
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 2 Max rates 3.8/5 (32nd percentile of 29 Large-class units), and DELTA 3800 Gen4 rates 4.1/5 (48th percentile of 22 Home Backup-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.
67.5 Pounds, a Handle at Each End
The DELTA 4 (3800) weighs 67.5 lb, 16.8 lb more than the DELTA 2 Max, for 1,715 Wh more battery. It carries by a handle at each end. For a box that lives in one place, that's a lift you make once.
UPS Switchover: ≤10ms vs ≤20ms
Both list a UPS mode, at different rated speeds. The DELTA 3800 Gen4 is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The DELTA 2 Max is rated ≤20ms — 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. The DELTA 3800 Gen4's figure is a maximum rather than a guarantee — it depends on registering the unit in the EcoFlow app, which adds two years to a three-year standard term. Worth saying because the per-dollar framing can suggest otherwise: the DELTA 2 Max works out at 4.8 years of cover per $1,000 spent against the DELTA 3800 Gen4's 2.3, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The DELTA 3800 Gen4 is rated for 6,000 cycles vs 3,000. In real life: at daily use, that's 16.4 vs 8.2 years. At weekend use (twice a week), it's 58 vs 29 years. One caution reading years across different sizes: a cycle is 3,763Wh on the DELTA 3800 Gen4 and 2,048Wh on the DELTA 2 Max, so count lifetime energy — roughly 22,578 kWh against 6,144 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.
Full record above — the Test Desk pick is the DELTA 3800 Gen4.
Check DELTA 3800 Gen4 price →or check the DELTA 2 Max 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 2 Max is cheaper to buy, but the DELTA 3800 Gen4 is cheaper to own. At $0.10/kWh over its lifetime vs $0.17/kWh, the DELTA 3800 Gen4's higher cycle life and capacity make each dollar go further over the years.
Growth path
DELTA 2 Max
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 2,048Wh.
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.
DELTA 3800 Gen4
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,763Wh.
Accepts up to 2,000W 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 3800 Gen4's higher solar ceiling (2,000W vs 1,000W) 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 2 Max
The DELTA 2 Max has a track record, if a short one. Its file comes from reviewers rather than long-term ownersA0. One found the LFP cells as solid after six months as on day oneA3, and reviewers clock a full wall charge at about 80 minutesA2.
Expect fan noise when it works hard. Reviewers describe loud fans under heavy loads and while charging, with a Quiet Charging mode that trades noise for timeA1. Their verdict is still worth buying, with caveatsA4.
“Fast AC wall charging — 0 to 80% in about 50 minutes and a full charge in roughly 80 minutes.”
Sources
powerstationadvisor.com · pcworld.com · thesolarlab.com · protoolsadvisor.com · trailandkale.com
EcoFlow DELTA 3800 Gen4
Nobody has lived with a DELTA 4 (3800) yet. EcoFlow put it on sale in the US on November 4 and says it ships in late NovemberB10, so this side rests on EcoFlow's US store and manual and on our arithmeticB0B5.
I'd want to see what the second solar input adds on a short winter day. I'd put a string of panels on each input, run a DELTA 2 Max off a matching string beside it, and compare the two batteries at sunset. If the bigger box isn't well ahead by dinner, the second input isn't earning its money where you live.
“Capacity 3,763 Wh, LFP (LiFePO4) cells. EcoFlow sells it as the DELTA 3800 Gen4; buyers and the press call the pair the DELTA 4.”
Sources
us.ecoflow.co · jp.ecoflow.co
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Solid LFP durability, fast charging, and ecosystem/expandability are the praise; loud fans under heavy load or charging are the recurring complaint. [DELTA 2 Max · 3 entries]
- Launch-day ledger: every entry is EcoFlow's own US store and documentation, or our labelled arithmetic. No owner or reviewer evidence exists yet. [DELTA 3800 Gen4 · 12 entries]
- A1
“Fan noise is a significant issue — cooling fans can get loud, around 52 dB during heavy loads or charging; a Quiet Charging mode reduces noise but extends charge time, and giving it 6 inches of clearance helps airflow.”
powerstationadvisor.com / pcworld.com — DELTA 2 Max review · 2025-2026 · [negative]
- A2
“Fast AC wall charging — 0 to 80% in about 50 minutes and a full charge in roughly 80 minutes.”
thesolarlab.com / protoolsadvisor.com — DELTA 2 Max review · 2025-2026 · [positive]
- A3
“LiFePO4 chemistry rated for 3,000+ cycles to 80% with superior thermal stability; after 6 months of real use there was no structural degradation and it felt as solid as day one.”
powerstationadvisor.com / trailandkale.com — DELTA 2 Max review · 2025-2026 · [positive]
- A4
“Reviewers say it's still worth buying but with caveats — a versatile unit with expandability and ecosystem compatibility.”
thesolarlab.com / powerstationadvisor.com — DELTA 2 Max review · 2025-2026 · [mixed]
- B3
“AC outlets: 5 total, four rated 20 A max and one rated 30 A max (on EcoFlow's product images, four T-slot outlets and a three-slot twist-lock). USB-A: one port, 36 W max. USB-C: one at 140 W max and two at 65 W max; the two 65 W ports share circuitry with the USB-A, limited to 16 W total when used together. No 12 V car socket.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B5
“Solar: two inputs, 11–60 V DC at up to 20 A and 1,000 W each, 2,000 W total (XT60i; two XT60i-to-LP60 cables are in the box). EcoFlow lists six charging methods; its 800 W Alternator Charger is limited to 500 W through the Solar/DC port.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B6
“Extra Battery Port: up to two extra batteries through EcoFlow's Smart Extra Battery Expansion Adapter. Compatible: the DELTA Pro 3 Smart Extra Battery and the DELTA 3 Max Plus (2,048 Wh) Smart Extra Battery. EcoFlow quotes 4–12 kWh of expandable capacity.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B7
“Weight 67.5 lb (30.6 kg); 16.77 × 11.36 × 12.09 in without handles, 18.76 in long with them. A handle at each end; EcoFlow sells a folding transport cart separately ($109 at launch, listed at $199). EcoFlow calls it the smallest and lightest portable power station in its class (3–4 kWh and 3,600 W).”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B10
“On sale at us.ecoflow.com from November 4, 2026 at $2,199; EcoFlow says it ships in late November. Kits: with two 160 W solar panels $2,899; with a DELTA 3 Max Plus extra battery (6 kWh in all) $2,999. EcoFlow also sells it in Japan, where it went on sale October 30 at ¥240,900.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 2 Max if you…
- →Your budget stops near $1,049. The DELTA 4 (3800) is $1,150 more.
- →One night is the longest outage you plan for. It gets through eight hours with a little left.
- →It travels more than it parks. 50.7 lb against 67.5.
- →You run a cooler off a car socket. The DELTA 2 Max has one and the DELTA 4 (3800) doesn't.
Buy the DELTA 3800 Gen4 if you…
If neither fits
If all you need is a CPAP on camping trips, both are more box than the job. The CPAP night uses 320 Wh, a small slice of either battery. A smaller, lighter unit does it for far less money.
The Bottom Line
If this is backing up a house and the sun is your recharge, I'd buy the DELTA 4 (3800). It comes out of the first night with most of a second one left, and it takes twice the solar to refill.
If one night is all you plan for, or your budget stops at the DELTA 2 Max, buy the DELTA 2 Max. It's lighter, it grows too, and it costs less than half as much.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
How much is the EcoFlow DELTA 4 (3800) in the US?
EcoFlow lists it at $2,199 on its US store, and says it ships in late November. The DELTA 2 Max sells for $1,049.
Is the DELTA 4 (3800) worth more than twice the price of the DELTA 2 Max?
For home backup through outages longer than a night, yes. It holds 3,763 Wh against 2,048 Wh and takes twice the solar input. For one-night outages, camping or tailgates, the DELTA 2 Max does the job for less than half the money.
Can the DELTA 2 Max and the DELTA 4 (3800) both add extra batteries?
Yes. The DELTA 2 Max takes EcoFlow's expansion batteries. The DELTA 4 (3800) takes up to two DELTA 3 Max Plus or DELTA Pro 3 extra batteries through an adapter, and EcoFlow quotes 4 to 12 kWh in all.
Which one charges faster from solar?
The DELTA 4 (3800). It has two solar inputs at 1,000 W each, 2,000 W in all, against 1,000 W on the DELTA 2 Max. You need enough panels on both inputs to use all of it.
How heavy is the DELTA 4 (3800) compared with the DELTA 2 Max?
The DELTA 4 (3800) weighs 67.5 lb and the DELTA 2 Max 50.7 lb, a difference of 16.8 lb. EcoFlow sells a folding cart for the DELTA 4 separately.
Where to buy
EcoFlow DELTA 2 Max
$1,029.00
$1,029.00 · direct from EcoFlow
Last checked 31 days ago. Prices move — check before you buy.
EcoFlow DELTA 3800 Gen4Pick
$2,199.00
$2,199.00 · direct from EcoFlow
Prices may vary by retailer and are subject to change.