Head-to-head test
EcoFlow DELTA 3800 Gen4 vs EcoFlow DELTA Pro Ultra XBatteries Get It Near Ultra X Storage. Do You Need the Power?
EcoFlow DELTA 3800 Gen4 vs EcoFlow DELTA Pro Ultra X: extra batteries take the DELTA 4 (3800) toward the Ultra X's 12,288 Wh, but never past 3,600 W or to a 240 V outlet, while the Ultra X runs 12,000 W with 240 V. Start with the DELTA 4 (3800) if everything you back up plugs into an ordinary outlet, and buy the Ultra X only if a 240 V load must run.
Black Friday · 23 days out
Price to beat:DELTA Pro Ultra X $7,699
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3800 Gen4 → · EcoFlow DELTA Pro Ultra X →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunner’s take
Whole-Home Backup Tester
Storage is the one thing the DELTA 4 (3800) can buy later.
It starts at 3,763 Wh in a 67.5 lb box, and its battery port takes up to two of EcoFlow's extra batteries, which EcoFlow puts at 4 to 12 kWh for the whole systemA6. The DELTA Pro Ultra X starts at 12,288 Wh. The storage gap closes in steps.
Watts and volts are the things it can't buy at all.
The DELTA 4 (3800) runs 3,600 W at 120 V and surges to 7,200 W. The Ultra X runs 12,000 W at 120 and 240 V and surges to 45,000 WB1. Extra batteries add hours to the smaller system and never add output, so a 240 V well pump needs the Ultra X however many batteries sit beside the DELTA 4.
That turns the price question into a question about your panel.
The DELTA 4 (3800) lists at $2,199 and the Ultra X at $7,999, $5,800 apart. The gap pays for 240 V, 12,000 W and a 10,000 W solar inputB3. If none of those is on your list, it pays for nothing you'll use.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
You don't have to buy the third night today. Buy the base unit for the outage you had, and add a battery when one outlasts it. EcoFlow already sells it as a kit with a DELTA 3 Max Plus extra battery, 6 kWh in allA10, while the Ultra X asks for its whole 12,288 Wh up front.
DELTA 4 (3800): 3,763 Wh base, up to two extra batteries, 4 to 12 kWh in all by EcoFlow's quoteA6DELTA Pro Ultra X: 12,288 Wh base8-Hour Blackout: the DELTA 4 (3800) ends with 1,554 Wh, 94% of a second night
Why it mattersIf your outages have been one-nighters so far, start with the base unit and let the next long one tell you whether to grow.
continuous output
Batteries buy runtime. They never buy starting current or a second voltage. An expanded DELTA 4 can keep a fridge, a furnace blower and the Wi-Fi going for days and still can't start a 240 V well pump or central air.
DELTA 4 (3800): 3,600 W continuous, 7,200 W surge, no 240 V outletDELTA Pro Ultra X: 12,000 W continuous, 45,000 W surge, 240 V outletsEcoFlow pitches the Ultra X as enough for a 5-ton air conditionerB1
Why it mattersIf one 240 V load is on the must-run list, don't start down the expansion path, because it ends in the wrong place.
solar input
Expand the DELTA 4 toward 12 kWhA6 and the same 2,000 W of panel inputA5 has three times the battery to refill, so a full recharge takes a whole good solar day. The Ultra X's input is sized for a roof. On sun alone, the inputs decide day three, not the battery.
DELTA 4 (3800): two solar inputs, 1,000 W each, 2,000 W totalA5DELTA Pro Ultra X: up to 10,000 W of solarB3DELTA 4 (3800) expanded: 4 to 12 kWh by EcoFlow's quoteA6
Why it mattersIf you expand for long outages, plan the panels at the same time, and accept that the DELTA 4 will store more than it can refill in a short winter day.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: Both take more batteries, so the question is how far each one goes and what it can't add.
solar input
The DELTA 4 (3800) grows one battery at a time. Its port takes EcoFlow's DELTA Pro 3 Smart Extra Battery or the DELTA 3 Max Plus extra battery at 2,048 Wh, up to two through EcoFlow's expansion adapterA6. EcoFlow quotes 4 to 12 kWh for the whole systemA6.
The Ultra X grows past anything a portable reaches. It goes to 61.44 kWh on one inverter and 184.32 kWh with threeB2. That's a house with a big array behind it. If your target sits under the DELTA 4's ceiling, you reach it without an install, and you pay for it as you go.
What the Specs Don't Tell You
Selected because: 45,000 W of surge against 7,200 W, and 240 V outlets only on the Ultra X.
rated cycles
The DELTA 4's limit is its inverter, and no battery moves it. It runs 3,600 W at 120 V and surges to 7,200 W, enough for a fridge, a sump pump and the furnace blower as long as they don't all start at once. The Ultra X runs 12,000 W and surges to 45,000 W, which EcoFlow credits to its Adaptive StartB1. That's the margin for central air, and nothing on the DELTA 4 side reaches it.
Both switch over in no worse than 10 ms. For a fridge and the router that's a blink nobody sees. EcoFlow's FAQ says the DELTA 4 doesn't support HID, the signal a UPS sends a computer so it can shut down cleanlyA8, so a desktop on it needs someone awake to save the work.
Your Life, Your Pick
Selected because: On its own battery the DELTA 4 (3800) finishes everything but Van Life Daily.
On one battery, the DELTA 4 (3800) covers every scenario but one. The camping weekend leaves it 1,099 Wh to spare, and the CPAP night, the workday and the tailgate barely move the gauge.
Van Life Daily leaves it 1,486 Wh short, and that's what the port is for. One DELTA 3 Max Plus extra battery adds 2,048 WhA6, more than the gap. The Ultra X covers the day out of the box, but nobody bolts 298.7 lb of house battery into a van.
Portability & Form Factor
Selected because: 67.5 lb against 298.7 lb: one leaves the house on weekends, the other becomes part of it.
weight
The base unit can keep a weekend job. It's 67.5 lb with a handle at each endA7, heavier than a full suitcase and still a one-person lift into the truck bed. Expand it, and the extra batteries can stay home by the fridge while the DELTA 4 goes to the cabin.
The Ultra X is 231 lb heavier and never meant to move. It goes in on EcoFlow's quick-connect installB4 and stays. I'd site it like a water heater: once, with the wiring in mind.
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 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.
EcoFlow DELTA Pro Ultra X
Front panel
- 12× 20 A outletsOutTwo NEMA 5-20 outlets, 120 V at 20 A each. All the outlets share 12,000 W.
- 2L14-30 · 120/240 VOutA NEMA L14-30 twist-lock, 120/240 V at 30 A.
- 314-50 · 120/240 V 50 AOutA NEMA 14-50 outlet, 120/240 V at 50 A: the same outlet a 50 A RV cord plugs into.
The covers are printed 120V 20A, 120V/240V 30A and 120V/240V 50A. Above them, under the screen: the AC output button and the power button. No USB ports and no DC output: EcoFlow’s spec table and manual list none.
Photo: EcoFlow · Product image, EcoFlow user manual · numbers and labels are ours. Outlet types and ratings from EcoFlow’s US spec table and manual; the cover printing read from EcoFlow’s store picture.
Rear and side panel
- 1Power In/Out · 50 AIn · OutEcoFlow’s Power In/Out port, 120/240 V at 50 A, 12,000 W. With EcoFlow’s cables it charges from a wall socket (1,800 W), an L14-30 outlet (7,200 W), or a 14-50 outlet or J1772 EV charger (12,000 W).
- 22× Battery portIn · OutTwo ports for DELTA Pro Ultra batteries, up to ten (61.4 kWh) on one inverter. EcoFlow says to use both, with the same number of batteries on each, to reach 12 kW.
- 32× High-PV in · 5,000 WInTwo high-voltage solar inputs (terminals printed PV1 and PV2): 80–500 V at 15 A, up to 5,000 W each and 10,000 W in all. Panels are wired into EcoFlow’s PV Switch Box (standard), whose cable plugs in here.
In use the ports sit behind covers; EcoFlow’s store picture shows the Power In/Out cover printed AC POWER IN/OUT PORT.
Photo: EcoFlow · Product image, EcoFlow user manual (EcoFlow’s callout lines removed) · numbers and labels are ours. Port names from EcoFlow’s manual; ratings from EcoFlow’s US spec table, manual and store FAQ; PV terminal names printed on the panel.
Strengths & trade-offs
EcoFlow DELTA 3800 Gen4
Strengths
- +Costs $5,800 less
- +Lighter by 231.2 lb
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-8,400W) limits appliance compatibility.
EcoFlow DELTA Pro Ultra X
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$5,800) than the DELTA 3800 Gen4.
- –Significantly heavier (+231.2 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 3,500 charge cycles vs the DELTA 3800 Gen4's 6,000, so it wears out sooner.
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 Pro Ultra X at 298.7 lbs is not a take-along — it rolls off a truck bed if it travels at all, so this scenario belongs to the DELTA 3800 Gen4 by default — and it earns it, covering the 2,100Wh with 1,099Wh to spare. Capacity was never the DELTA Pro Ultra X's problem here; getting to a campsite was.
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 Pro Ultra X
Both finish the 1,645 Wh night. The Ultra X takes the row on what's left: 8,800 Wh against 1,554 Wh, five more nights against most of one.
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 of these cover the night several times over — capacity isn't the question here. The only published difference is fan noise, and it can't settle this: the DELTA Pro Ultra X is rated 30dB and the DELTA 3800 Gen4 40dB, but the DELTA Pro Ultra X's is its maker's best case and the DELTA 3800 Gen4's is EcoFlow's maximum under heavy charge and discharge, so at a 40W draw the real gap can only be narrower than it looks, and may even run the other way. Neither settles which box is quieter at a bedside. Buy whichever is cheaper or easier to carry.
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 Pro Ultra X
Both finish the 910 Wh day. The Ultra X wins on slack, 9,535 Wh against 2,289 Wh, though the workday never gets near either limit.
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
The DELTA Pro Ultra X at 298.7 lbs is not a take-along — it rolls off a truck bed if it travels at all, so this scenario belongs to the DELTA 3800 Gen4 by default — and it earns it, covering the 670Wh with 2,529Wh to spare. Capacity was never the DELTA Pro Ultra X's problem here; getting to a tailgate was.
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
DELTA Pro Ultra X
On its own battery the DELTA 4 (3800) falls 1,486 Wh short of the 4,685 Wh day, so the Ultra X takes the row with 5,760 Wh spare. The DELTA 4 closes that gap only with an extra battery on its port.
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 Pro Ultra X runs 51h vs 15.6h.
$7,999 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 0–696.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–139.3hHigh-Draw Appliances
These reveal the real limitsscale 0–10.4h¹ 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 3800 Gen4
If everything you'd back up plugs into a 120 V outlet, I'd start with the DELTA 4 (3800) and add batteries when the outages ask for them. On its own battery it finishes our eight-hour blackout with 1,554 Wh left, 94% of a second night. Its port takes up to two of EcoFlow's extra batteries, and EcoFlow quotes 4 to 12 kWh for the expanded systemA6, which brings its storage near the Ultra X's 12,288 Wh base. What no battery adds is the Ultra X's 12,000 W, its 240 V outlets or its 10,000 W solar input, so a 240 V well pump or central air sends you straight to the Ultra X. Price the extra batteries before you count on that path; EcoFlow ships the DELTA 4 (3800) in late NovemberA10.
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 Pro Ultra X price$7,899.00 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): UPS, RV Living, Solar Generator, Tailgating, 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 3800 Gen4 rates 4.1/5 (48th percentile of 22 Home Backup-class units), and DELTA Pro Ultra X rates 4.3/5 (61st percentile of 39 Whole-Home / Off-Grid-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.
231 lb Apart
The DELTA 4 (3800) is 67.5 lb, a one-person lift to the truck. The Ultra X is 298.7 lb across its boxes and gets set up once. Extra batteries add weight to the DELTA 4 too, but as separate pieces you can leave at home.
Batteries Don't Raise the Ceiling
The Ultra X surges to 45,000 W and the DELTA 4 (3800) to 7,200 W. A fridge compressor starts on either. Extra batteries give the DELTA 4 more hours at the same 7,200 W, so a big 240 V motor stays the Ultra X's job.
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 3800 Gen4 works out at 2.3 years of cover per $1,000 spent against the DELTA Pro Ultra X's 0.6, but that spread is the price gap, not the terms.
Rated Longer, Built Smaller
The DELTA 4 (3800) is rated for 6,000 cycles against 3,500, which is 16.4 years against 9.6 at a cycle a day. Each Ultra X cycle is bigger, so its rated life adds up to 43,008 kWh against 22,578 kWh. Backup that runs a few nights a year never gets near either rating.
Full record above — the Test Desk pick is the DELTA 3800 Gen4.
Check DELTA 3800 Gen4 price →or check the DELTA Pro Ultra X 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 3800 Gen4 wins on both sticker price and long-term value. At $0.10/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. One caution on the lifespan row: the DELTA 3800 Gen4 takes longer to reach its cycle rating, but a cycle moves a different amount of energy on each unit — the DELTA Pro Ultra X still delivers more over its shorter horizon (43,008 vs 22,578 kWh). Years measure wear, not usefulness.
Growth path
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.
DELTA Pro Ultra X
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 10,000W of solar. Enough for a serious multi-panel array.
Limited ports. You'll likely need a power strip or splitter.
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 Pro Ultra X's higher solar ceiling (10,000W vs 2,000W) 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 3800 Gen4
Nobody in the US has a DELTA 4 (3800) running yet. EcoFlow put it on sale November 4 and ships it in late NovemberA10, so this page leans on EcoFlow's US store page and our own arithmeticA5A6A9.
I'd want to prove the expansion path before I sold anyone on it. Hypothetically, I'd set up the kit EcoFlow sells with a DELTA 3 Max Plus extra battery, 6 kWh in allA10, hang a day of house loads on it, and watch how the two packs share the drain in the app.
“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
EcoFlow DELTA Pro Ultra X
For the Ultra X, our ledger is EcoFlow's figures as review sites passed them along. That's 12 kW from the base system, scaling to 36 kW with more invertersB1, storage up to 184.32 kWhB2 and a CES 2026 Innovation AwardB4. It holds no long-term owner reports yet.
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
Sources
ecoflow.com · outboundpower.com · bobvila.com · 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
- 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]
- Whole-home 12kW output, massive scalability (to 184kWh), EV-grade LFP, 10kW solar, and fast install are the standout features. [DELTA Pro Ultra X · 3 entries]
- A5
“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]
- A6
“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]
- A7
“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]
- A8
“Switches to backup within 10 ms when the grid drops; EcoFlow's FAQ says it does not support HID communication. Noise by EcoFlow's figures: 40 dB or less at up to 1,800 W, 50 dB or less at the full 3,600 W. IP20.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- A9
“Rated for 6,000 cycles (EcoFlow: "15+ years"). Charges at 32–113°F (0–45°C), runs at 14–113°F (−10–45°C). Wi-Fi and Bluetooth with the EcoFlow app. Warranty: 3 years plus a 2-year extension when registered 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]
- A10
“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]
- B1
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X review · 2026 · [positive]
- B2
“Base 12.288kWh of LFP storage (6,144Wh x 2), expandable to 61.44kWh with one inverter and up to 184.32kWh with three inverters and thirty batteries.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X · 2026 · [positive]
- B3
“EV-grade full-tab LFP cells with a multi-layer safety architecture and 24/7 BMS oversight; solar charging up to 10kW.”
ecoflow.com / bobvila.com — DELTA Pro Ultra X review · 2026 · [positive]
- B4
“A quick-connect design cuts installation time and cost by up to 80%, ready in about 7 days; a CES 2026 Innovation Award Honoree at a $7,999 base price.”
ecoflow.com / thesolarlab.com — DELTA Pro Ultra X review · 2026 · [positive]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 3800 Gen4 if you…
- →Everything on your list plugs into a 120 V outlet. A fridge, a furnace blower, a sump pump and the Wi-Fi.
- →You'd rather buy storage in steps. Start at 3,763 Wh and add up to two extra batteries as the outages teach youA6.
- →The base unit has a weekend job. At 67.5 lb it goes to the cabin, and the extra batteries can stay home.
- →You want it before the holidays. EcoFlow ships it in late NovemberA10.
Buy the DELTA Pro Ultra X if you…
- →A 240 V load is on the must-run list. A well pump, central air or an electric range needs its 240 V outlets.
- →You want every circuit, not a short list. It runs 12,000 W against the DELTA 4's 3,600 W.
- →The roof is the generator. It takes 10,000 W of solar against 2,000 W.
If neither fits
If the plan is one night of a fridge and a router, both are more than the job. The smaller DELTA 4 covers that, and you never have to price an extra battery.
The Bottom Line
If your house runs on 120 V outlets, I'd start with the DELTA 4 (3800) and let the outages decide how many batteries it gets. It grows toward the Ultra X's storageA6 without an install, and the base unit still goes camping.
If something on a two-pole breaker has to run, skip the steps and buy the Ultra X. No number of extra batteries gives the DELTA 4 a 240 V outlet or a bigger inverter.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the DELTA 4 (3800) be expanded to match the DELTA Pro Ultra X?
On storage it gets close, on power it doesn't. With up to two EcoFlow extra batteries, EcoFlow quotes 4 to 12 kWh for the system, against the Ultra X's 12,288 Wh base. Its output stays at 3,600 W with no 240 V outlet, while the Ultra X runs 12,000 W with 240 V outlets.
How much is the DELTA 4 (3800), and when does it ship?
EcoFlow lists it at $2,199 in the US. It went on sale November 4, 2026, and EcoFlow says it ships in late November. The DELTA Pro Ultra X lists at $7,999.
Can the DELTA 4 (3800) run central air or a 240 V well pump?
No. Its outlets are 120 V and it runs 3,600 W, and extra batteries don't change either. The DELTA Pro Ultra X has 240 V outlets, 12,000 W and a 45,000 W surge, and EcoFlow pitches it for a 5-ton air conditioner.
Which one charges faster from solar?
The DELTA Pro Ultra X, which takes up to 10,000 W of solar. The DELTA 4 (3800) takes 2,000 W across two inputs at 11 to 60 V each, and that stays the same when you add batteries.
What extra batteries work with the DELTA 4 (3800)?
EcoFlow lists two: the DELTA Pro 3 Smart Extra Battery and the DELTA 3 Max Plus Smart Extra Battery at 2,048 Wh. It takes up to two through EcoFlow's Smart Extra Battery Expansion Adapter.
Where to buy
EcoFlow DELTA 3800 Gen4Pick
$2,199.00
$2,199.00 · direct from EcoFlow
EcoFlow DELTA Pro Ultra X
$7,899.00
$7,899.00 · direct from EcoFlow
Last checked 31 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.