Head-to-head test
EcoFlow DELTA 3 Ultra vs EcoFlow DELTA 3800 Gen4More Battery, Less Weight, Room to Grow. Worth the Extra?
EcoFlow DELTA 3 Ultra vs EcoFlow DELTA 3800 Gen4: the same 3,600W inverter, but the newer one holds 3,763Wh against 3,072Wh, takes 2,000W of solar against 800W and adds extra batteries. Buy the DELTA 3 Ultra if 3,072Wh covers you. Pick the newer one only when you'll add panels or a battery later.
Black Friday · 23 days out
Price to beat:DELTA 3 Ultra $1,199
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3 Ultra → · 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
The DELTA 4 (3800) is more Ultra in a lighter box.
It holds 3,763 Wh against 3,072 Wh and weighs 67.5 lb against 72.1 lb. Both run the same 3,600 W and surge to the same 7,200 WB2, so the inverter doesn't separate them.
Then comes the bill.
EcoFlow lists the DELTA 4 (3800) at $2,199, and the Ultra sells for $1,399. That's $800 for a little over a fifth more battery, plus two things the Ultra can't do at any price: take 2,000 W of solar and add extra batteriesB5B6.
So the question is whether you'll grow it.
If the box you buy is the box you keep, the Ultra finishes every job the DELTA 4 (3800) finishes. If you'll add panels or a battery, only one of them has room. The DELTA 4 (3800) ships in late NovemberB10, and the Ultra is on sale today.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
After an eight-hour blackout the DELTA 4 (3800) has nearly a second night left, and the Ultra a little over half of one. That's comfort in a long outage. On its own, it's an expensive way to buy comfort, because the same money could buy panels to refill the Ultra the next morning.
DELTA 4 (3800): 3,763 Wh; DELTA 3 Ultra: 3,072 Wh8-Hour Blackout: the DELTA 4 (3800) ends with 1,554 Wh left, the Ultra with 966 WhEvery scenario either unit finishes, the other finishes too; Van Life Daily beats both
Why it mattersIf one night is the outage you plan for, capacity alone doesn't justify the bigger box.
EcoFlow's kit with one DELTA 3 Max Plus battery comes to 6 kWh in allB10, which puts Van Life Daily's 4,685 Wh within reach. The Ultra's only route to that day is a second station: two inverters, two sets of cables and no shared battery.
DELTA 3 Ultra: sealed at 3,072 Wh, no expansion portDELTA 4 (3800): up to two extra batteries, the DELTA Pro 3 battery or the DELTA 3 Max Plus battery, through EcoFlow's adapterB6Van Life Daily needs 4,685 Wh: the Ultra is 2,074 Wh short, the DELTA 4 (3800) 1,486 Wh short
Why it mattersIf your needs might grow toward whole days off-grid or more of the house, the DELTA 4 (3800) is the one with a next step.
In a multi-day outage the sun is the only charger left, so refill speed decides whether day three starts full. But 2,000 W of input means owning 2,000 W of panels, which is a lot of glass to buy, mount and store. With 800 W of panels or fewer, the DELTA 4's second input sits empty.
DELTA 4 (3800): two solar inputs, 1,000 W each, 11 to 60 VB5DELTA 3 Ultra: 800 W of solarBattery sizes: 3,763 Wh against 3,072 Wh
Why it mattersCount the panels you own or will buy. Past 800 W, only the DELTA 4 (3800) can use them.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: The Ultra stops at 3,072Wh; the DELTA 4 (3800) takes EcoFlow's extra batteries.
solar input
The Ultra is finished the day it arrives. It's sealed at 3,072 Wh, so outgrowing it means buying a second station. The DELTA 4 (3800) takes up to two extra batteries, either EcoFlow's DELTA Pro 3 battery or its DELTA 3 Max Plus battery, through an expansion adapterB6.
This is the reason to pay more. EcoFlow quotes 4 to 12 kWh for the whole stackB6, which reaches from a long weekend into partial-home backup. If you can't picture yourself buying that first extra battery, this section is worth nothing to you, and neither is most of the price gap.
Your Life, Your Pick
Selected because: Both finish every scenario but Van Life Daily; the DELTA 4 (3800) ends the blackout with 1,554Wh left against 966Wh.
Both finish the night. The bigger one finishes with more to spare. The eight-hour blackout needs 1,645 Wh. The DELTA 4 (3800) ends it with 1,554 Wh left, nearly a second night. The Ultra ends with 966 Wh.
Camping tilts the same way, and Van Life Daily beats both. The Ultra ends the weekend with 511 Wh, the DELTA 4 (3800) with 1,099 Wh. Van Life Daily needs 4,685 Wh, and only the DELTA 4 (3800) can add a battery to get there.
What the Specs Don't Tell You
Selected because: The Ultra keeps a 12 V car socket and an RV outlet; the DELTA 4 (3800) takes 2,000W of solar against 800W.
rated cycles
The Ultra has the sockets for a vehicle. It carries a 12 V car socket and a 30 A RV outlet. The DELTA 4 (3800) has no car socket, and its 30 A outlet is a three-slot twist-lockB3, so a camper's shore cord needs an adapter.
The DELTA 4 (3800) has the inputs for a roof. Two solar inputs at 1,000 W eachB5 against the Ultra's 800 W, and up to 1,800 W from the wallB4. That wall rate is all 15 A of a standard circuit at 120 VB4, so on a shared kitchen circuit I'd dial it down in the app.
Portability & Form Factor
Selected because: More battery in the lighter box: 67.5 lb against 72.1 lb.
weight
The bigger battery is the lighter box. 67.5 lb against 72.1 lb, so the extra capacity rides along without costing your back anything. The DELTA 4 (3800) has a handle at each end, and EcoFlow sells a folding cart for it separatelyB7.
Neither is a casual carry. Both are a straight-back, one-person lift into a hatchback for a few steps. I carry heavier things than this for work, but not down basement stairs if a cart is on offer.
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 3 Ultra
Front panel
- 1USB-C · 140 WOutUp to 140 W, printed on the panel.
- 22× USB-C · 45 WOutUp to 45 W each, printed on the panel.
- 3USB-A · 18 WOutUp to 18 W, printed on the panel.
- 44× 20 A outletsOutFour T-slot 120 V outlets, sharing 3,600 W continuous and a 7,200 W surge.
- 530 A RV outletOutAn RV outlet marked 30A MAX. A camper’s shore-power cord plugs straight in.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port ratings printed on EcoFlow’s panel; output totals from our catalogue.
Rear panel
- 1AC inInThe AC charging inlet.
- 2Charge-speed switchInSwitches the AC charging speed.
- 3Solar/DC in · 800 WInUp to 800 W of solar.
- 412 V car socketOutA 12 V car socket with its own on/off button, for a car fridge.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s panel; the solar figure from our catalogue.
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 3 Ultra
Strengths
- +Costs $800 less
Trade-offs
- –Sealed capacity — the DELTA 3800 Gen4 can add batteries to grow past 3,072Wh; this one can't.
- –Shorter-lived battery — rated for 4,000 charge cycles vs the DELTA 3800 Gen4's 6,000, so it wears out sooner.
EcoFlow DELTA 3800 Gen4
Strengths
- +Lighter by 4.6 lb
- +Larger battery capacity
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$800) than the DELTA 3 Ultra.
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
Both cover the 2,100 Wh, but the DELTA 4 (3800) finishes with 1,099 Wh against 511 Wh. A cold night only worries the Ultra.
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 finish. The DELTA 4 (3800) ends with 1,554 Wh left, nearly a second night. The DELTA 3 Ultra ends with 966 Wh.
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
Either one runs a 40 W CPAP for many nights. Noise can't split them: EcoFlow's figure for the DELTA 4 (3800) is a ceiling under heavier load, and neither figure was taken at a CPAP's draw. Decide on price or weight.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Either unit
Both power your workstation all day without strain, and their USB-C output is a wash — pick on weight, ports, or price.
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
Either unit
Both handle game day easily. Since capacity isn't the deciding factor, weight is: at 67.5 lbs the DELTA 3800 Gen4 is the one you'll be glad you brought. Fan noise under load is worth a listen too — it's audible in the lulls between songs.
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 alone. The DELTA 4 (3800) can add an extra battery to get there. The DELTA 3 Ultra can't.
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 12.7h.
$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 EcoFlow DELTA 3 Ultra
I'd buy the DELTA 3 Ultra, unless you plan to add a battery or more than 800 W of panels. Both run 3,600 W and surge to 7,200 WB2. For $800 more, the DELTA 4 (3800) adds 691 Wh, 2,000 W of solar against 800 W, a port for up to two extra batteriesB6 and a box 4.6 lb lighter. Every scenario we run that one finishes, the other finishes too, so only the solar and the battery port change what you can do with it. If you'll use neither, the Ultra covers the same nights for $1,399 and is on sale now, while the DELTA 4 (3800) ships in late NovemberB10. If a sale shrinks the gap to a fraction of what it is, I'd take the bigger box.
Today the DELTA 3 Ultra is $1,299, $100 under its typical $1,399. The verdict weighs typical prices, not today's. Prices checked 31 days ago.
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.
$1,299.00 · direct from EcoFlow
down from $1,399 · 7% below usual
Last checked 31 days ago. Prices move — check before you buy.
or check the DELTA 3800 Gen4 price$2,199.00 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): Apartment Balcony.
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 Ultra rates 4.6/5 (79th 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.
The Bigger Battery Weighs Less
The DELTA 4 (3800) is 67.5 lb with 3,763 Wh. The DELTA 3 Ultra is 72.1 lb with 3,072 Wh. Neither is grab-and-go, but the newer one asks less of your back for more battery.
The Ultra's Ceiling Is 3,072 Wh
No expansion port, so growing means a second station. The DELTA 4 (3800) takes EcoFlow's extra batteries, and that's the strongest reason on this page to pay more for it.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Both figures are maximums rather than guarantees — they depend 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 3 Ultra works out at 3.6 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 4,000. In real life: at daily use, that's 16.4 vs 11 years. At weekend use (twice a week), it's 58 vs 38 years. 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 3 Ultra.
Check DELTA 3 Ultra price →or check the DELTA 3800 Gen4 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 Ultra is cheaper to buy, but the DELTA 3800 Gen4 is cheaper to own. At $0.10/kWh over its lifetime vs $0.11/kWh, the DELTA 3800 Gen4's higher cycle life and capacity make each dollar go further over the years.
Growth path
DELTA 3 Ultra
FIXED CAPACITYFixed at 3,072Wh — a sealed, complete system rather than a starting point. There's no expansion port, so that figure is the ceiling: check it against your longest unplugged stretch before you buy.
Accepts up to 800W of solar. Suitable for a 1-2 panel setup.
Adequate ports for most setups, but heavy users may want a power strip.
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
The DELTA 3 Ultra is sealed at 3,072Wh, which is fine if that covers you. The DELTA 3800 Gen4 starts at 3,763Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the DELTA 3 Ultra doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Ultra
The reviews are mostly of the Ultra Plus, so I take them as character. Our research flags that the Plus shares the Ultra's capacity, inverter and chassis but differs on solar, expansion and weightA0. On what they share, reviewers found the fans quiet even pushed hardA1A2 and the switchover seamless when they pulled the plugA5A6.
Two quirks came up. One reviewer saw the 30 A port shut off first under overloadA3. Another had to cup a hand over the screen in direct sunA11. A third noted it doesn't cap what you can draw at whatever is coming in while it chargesA4.
“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 · popsci.com
EcoFlow DELTA 3800 Gen4
Nobody owns one yet. The DELTA 4 (3800) went on sale in the US on November 4 and ships in late NovemberB10, so everything here is EcoFlow's US store page and our arithmetic on itB1B5.
I'd want to see both solar inputs earn their rating. On a clear afternoon I'd hang panels on each input and watch whether the display gets anywhere near 2,000 WB5. Most of this unit's case against the Ultra rests on that number and the battery portB6, so those are the first two things I'd check.
“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
- Reviewers consistently praise the quiet fan operation of the Ultra-tier unit compared to older EcoFlow models, though this is described in professional test conditions rather than long-term ownership. [DELTA 3 Ultra · 2 entries]
- UPS/switchover performance is repeatedly called seamless with no observed dips or shutdowns during power interruption tests. [DELTA 3 Ultra · 3 entries]
- The unit's substantial 74 lb weight is flagged across multiple reviews as a portability drawback, mitigated somewhat by wheels and handle design. [DELTA 3 Ultra · 2 entries]
- Build quality/durability (casing, cable, port covers) is repeatedly highlighted as premium and well-engineered. [DELTA 3 Ultra · 2 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
“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? · 2025-09/10 (approx) · [positive]
- A2
“Even when you're pushing the inverter to its maximum output, the fans never become annoying or distracting.”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · 2025-09/10 (approx) · [positive]
- A3
“One weird thing we noticed was the fact that the unit always seems to shut down the 30A port first when you overload the unit.”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · 2025-09/10 (approx) · [mixed]
- A4
“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? · 2025-09/10 (approx) · [positive]
- A5
“Over my career I have become accustomed to APC batteries immediately switching on when there is a power hit or power shut-off, and the EcoFlow Delta 3 Ultra Plus works in the exact same way.”
postperspective.com — Review: EcoFlow Delta 3 Ultra Plus Portable Power Station · 2026-04 · [positive]
- A6
“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]
- A11
“But, 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 · 2025-11-16 · [negative]
- B1
“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.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B2
“US unit: 120 V AC, 60 Hz; rated 3,600 W continuous with a 7,200 W surge. It supports X-Boost (EcoFlow refers to the manual for the US X-Boost figure); X-Boost is unavailable while the unit charges from the wall or runs in bypass.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [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]
- B4
“AC input 100–120 V, 15 A, 50/60 Hz; X-Stream charging up to 1,800 W from a US wall outlet. Our arithmetic: 1,800 W at 120 V is 15 A, the full rating of an ordinary 15 A circuit, so on a shared circuit you would set the charge rate lower in the EcoFlow app.”
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 3 Ultra if you…
- →3,072 Wh already covers your outage. It finishes every scenario the DELTA 4 (3800) does, for $800 less.
- →You own 800 W of panels or fewer. The DELTA 4's second input would sit empty.
- →It lives in a van or an RV. A 12 V car socket and a 30 A RV outlet.
- →You need it now. It's on sale at $1,399.
Buy the DELTA 3800 Gen4 if you…
- →You'll add a battery. Up to two of EcoFlow's extra batteries, 4 to 12 kWh by EcoFlow's figureB6.
- →You have, or will buy, a big array. Two inputs, 2,000 W of solar in allB5.
- →Your outages run past one night. It ends the eight-hour blackout with 1,554 Wh left.
- →You'll carry it now and then. More battery than the Ultra at 67.5 lb against 72.1 lb.
If neither fits
If you want the Ultra's size with a battery port, look at the DELTA 3 Ultra Plus. Our research notes it's the Ultra with expansion and more solarA0.
The Bottom Line
If the box you buy is the box you keep, I'd buy the DELTA 3 Ultra. The same inverter, every scenario the bigger one finishes, and $800 left over.
If you'll add panels or a battery, buy the DELTA 4 (3800). It's the only one of the two with room to grow, and it's the lighter box while it does it.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA 4 (3800) worth the extra money over the DELTA 3 Ultra?
Only if you'll use what the money buys. Both run 3,600 W with a 7,200 W surge. The DELTA 4 (3800) adds 691 Wh, 2,000 W of solar against 800 W, and a port for up to two extra batteries. If you won't add panels or a battery, the Ultra finishes the same jobs for less.
How much does the DELTA 4 (3800) cost?
EcoFlow lists it at $2,199 in the US and says it ships in late November. The DELTA 3 Ultra sells for $1,399.
Can the DELTA 3 Ultra add an extra battery?
No. It is sealed at 3,072 Wh. The DELTA 4 (3800) takes up to two extra batteries, the DELTA Pro 3 battery or the DELTA 3 Max Plus battery, through EcoFlow's adapter.
Which one charges faster from solar?
The DELTA 4 (3800). It takes 1,000 W on each of two inputs, 2,000 W in all, at 11 to 60 V. The DELTA 3 Ultra takes 800 W.
Which one is heavier, the DELTA 3 Ultra or the DELTA 4 (3800)?
The DELTA 3 Ultra, at 72.1 lb against 67.5 lb, even though it holds less: 3,072 Wh against 3,763 Wh.
Where to buy
EcoFlow DELTA 3 UltraPick
$1,299.00
$1,299.00 · direct from EcoFlow
down from $1,399 · 7% below usual
Last checked 31 days ago. Prices move — check before you buy.
EcoFlow DELTA 3800 Gen4
$2,199.00
$2,199.00 · direct from EcoFlow
Prices may vary by retailer and are subject to change.