Head-to-head test
EcoFlow DELTA 3800 Gen4 vs Goal Zero Yeti PRO 400048 lb Lighter and 2,000 More Cycles. Where Does the Yeti Win?
Same inverter, both take extra batteries, and the EcoFlow is 48 lb lighter with a higher cycle rating. I'd build on the DELTA 4 (3800), unless you're feeding a fixed array past 2,000 W or you need power before it ships.
Black Friday · 23 days out
Price to beat:Yeti PRO 4000 $4,000
We have never seen it discounted, so any real cut would be a first.
Full profiles: EcoFlow DELTA 3800 Gen4 → · Goal Zero Yeti PRO 4000 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunner’s take
Whole-Home Backup Tester
With the inverters tied, the Yeti PRO 4000 has to win on something else.
Both run 3,600 W and surge to 7,200 WA2, and both take extra batteriesA6. Goal Zero's Yeti holds 3,994 Wh at 115.7 lb. EcoFlow's DELTA 4 (3800) holds 3,763 Wh at 67.5 lbA1A7, 231 Wh less for 48 lb less.
What the Yeti has left is sun and a head start on the calendar.
It takes 3,000 W of solar against 2,000 W, and it's on sale now. EcoFlow ships the DELTA 4 (3800) in late NovemberA10.
The EcoFlow answers on cost and on life.
At $2,199 against $4,000, it costs a little over half as much per watt-hour, and EcoFlow rates it for 6,000 cycles against 4,000A9.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Once you plan to add batteries, the base unit stops being the system and becomes its first piece. EcoFlow sells the DELTA 4 (3800) as a kit with one Max Plus battery, about 6 kWh in allA10, and quotes 4 to 12 kWh with expansionA6. What's left to compare between the two bases is what each weighs and how long its cells are rated to last, and the EcoFlow leads on both.
Both take extra batteries; the DELTA 4 (3800) takes up to two through EcoFlow's expansion adapterA6One DELTA 3 Max Plus extra battery adds 2,048 WhA6Base units: 3,763 Wh and 3,994 Wh
Why it mattersIf you're building in steps, start with the lighter base and put the difference into batteries.
solar input
At the full 2,000 W, the DELTA 4 (3800)'s own 3,763 Wh refills from empty in a little under two hours of strong sun. Add extra batteries and that ceiling stays put while the bank grows, so a big EcoFlow system needs a long, clear day. A fixed array past 2,000 W is the one setup where the Yeti's 3,000 W input does real work and the EcoFlow leaves the extra on the roof.
DELTA 4 (3800): two solar inputs, 11 to 60 V, 1,000 W each, 2,000 W totalA5Yeti PRO 4000: 3,000 W solar input; Goal Zero and a reviewer put a full solar charge under two hoursB2DELTA 4 (3800): 3,763 Wh before any extra battery
Why it mattersIf your array is already bigger than 2,000 W, the Yeti uses all of it. If it isn't, the solar gap never leaves the spec sheet.
rated cycles
That puts the DELTA 4 (3800) at $0.10 a lifetime kWh against $0.25 for the Yeti. On a system that cycles daily off solar, the Yeti reaches its rating in 11 years and the EcoFlow in 16.4. On a box that waits for storms, neither rating ever arrives, and weight and solar decide instead.
DELTA 4 (3800): rated for 6,000 cyclesA9; Yeti PRO 4000: 4,000Rated lifetime energy: 22,578 kWh against 15,976 kWh$2,199 against $4,000
Why it mattersIf the system will work every day, the DELTA 4 (3800) is the cheaper energy by a wide margin.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: Both take extra batteries, so the 231 Wh between the base units is only a starting gap.
solar input
I'd plan an EcoFlow system around EcoFlow's batteries. The DELTA 4 (3800) takes one or two extra batteries through EcoFlow's expansion adapter, either the DELTA Pro 3 battery or the DELTA 3 Max Plus battery, and EcoFlow quotes 4 to 12 kWh in allA6. If a DELTA Pro 3 battery already sits in your garage, that settles it.
The Yeti grows too, and that's where our record goes quiet. It takes Goal Zero's expansion batteries, but our catalogue doesn't carry how far it grows. Its 3,000 W solar input is the stronger case for a big off-grid bank, since a bigger bank needs more sun to refill.
Lifetime Value
Selected because: 6,000 rated cycles against 4,000, from batteries 231 Wh apart.
cost / lifetime kWh
Over a whole battery life, the EcoFlow costs well under half as much per kWh. Spread each price over the energy its rated cycles deliver and the DELTA 4 (3800) comes to $0.10 a kWh against $0.25. The cycle ratings do that work, 6,000 against 4,000, on batteries 231 Wh apart.
It counts only if the system works for a living. Run it daily off solar and the Yeti reaches its rating in 11 years, when the EcoFlow still has 5.4 years left on its own. A box that waits at full charge for storms never gets near either.
Portability & Form Factor
Selected because: 67.5 lb against 115.7 lb, and the inverters are identical.
weight
I'd move the DELTA 4 (3800) alone and the Yeti with a friend. At 67.5 lb with a handle at each endA7, the EcoFlow is a straight-back lift into a hatchback. The Yeti is 115.7 lb, a two-person move by a reviewer's accountB1.
On a transfer switch, the weight is paid once. A transfer switch connects a battery to chosen house circuits, and a Yeti wired beside one only has to get there. Taken to the cabin every month, it's 48 lb more every trip for the same 3,600 W.
Brand Trust
Selected because: One is on sale today from a Salt Lake City company, and both support records carry real caveats.
Goal Zero's case is a US company with the unit on shelves now. It's based in Salt Lake City and owned by NRG Energy, and a reviewer singles out its US-based supportB1. Its recent support record is weaker than its reputation, with long waits and tickets left open for weeks.
EcoFlow's support is bigger and less predictable. It runs US phone, email and chat support, and its record splits between easy prepaid-label replacements and long waits. It also offers no parts or service once the warranty ends, which matters on a box rated for 6,000 cycles. Both warranties run 5 years, EcoFlow's with app registrationA9.
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.
Goal Zero Yeti PRO 4000
Front panel
- 12× 6 mm 12 V out · 10 AOutTwo 6 mm 12 V outputs, 135 W each (13.5 V, 10 A continuous) by Goal Zero’s specs. All the 12 V outputs share 375 W.
- 212 V car socket · 12 AOutA 12 V car socket, 162 W (13.5 V, 12 A continuous) by Goal Zero’s specs.
- 34× 20 A outletsOutFour T-slot 120 V outlets, 20 A and up to 2,400 W each by Goal Zero’s specs. All the AC shares 3,600 W continuous and 7,200 W peak, as printed on the panel.
- 43× USB-A · 18 WOutThree USB-A ports printed 18W QC, 54 W together by Goal Zero’s specs.
- 5USB-C · 100 WOutOne USB-C port printed 100W PD (5 to 20 V, up to 5 A).
- 62× USB-C · 30 WOutTwo USB-C ports printed 30W PD. The three USB-C ports share 160 W by Goal Zero’s specs.
The inputs, the RV outlet and the battery port are on the back, mapped below.
Photo: Goal Zero · Product image, Goal Zero store · numbers and labels are ours. Ratings printed on Goal Zero’s panel and in the tech specs on Goal Zero’s US store page.
Back panel
- 1Solar in (HPP) · 3,000 WInGoal Zero’s high-voltage input: up to 3,000 W, 13.3 to 150 V, up to 30 A by its specs. The panel prints Never exceed 145V.
- 28 mm DC in · 275 WInAn 8 mm low-voltage input: up to 275 W, 12.3 to 28 V, up to 10 A by Goal Zero’s specs. The panel prints Never exceed 30V.
- 3Input limit switchInA switch printed INPUT LIMIT, LOW and HIGH.
- 4AC in · 1,800 WInThe AC charging inlet: up to 1,800 W (90 to 144 V, up to 15 A) by Goal Zero’s specs.
- 512 V HPP out · 30 AOutA 12 V high-power port printed 12V DC OUT: 405 W (13.5 V, 30 A continuous) by Goal Zero’s specs.
- 6TT-30R RV outlet · 30 AOutA TT-30R RV outlet, 120 V, 30 A, 3,600 W by Goal Zero’s specs. A camper’s shore-power cord plugs straight in.
- 7Power+ · 3,600 WIn · OutGoal Zero’s Power+ port: 3,600 W out at 120 V, 30 A, or pass-through; it also charges the unit at up to 1,800 W.
- 8Battery portIn · OutPrinted EXPANSION: for Goal Zero’s Tank PRO 4000 batteries (100 A, 100 V max). Goal Zero says up to four tanks, 20 kWh in all.
- 9AC breakersOutTwo breakers printed AC OUT BREAKERS.
Photo: Goal Zero · Product image, Goal Zero store · numbers and labels are ours. Port names printed on Goal Zero’s panel; ratings from the tech specs on Goal Zero’s US store page and the panel’s printing.
Strengths & trade-offs
EcoFlow DELTA 3800 Gen4
Strengths
- +Costs $1,800.9 less
- +Lighter by 48.2 lb
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –No major technical downsides compared to rival.
Goal Zero Yeti PRO 4000
Strengths
- +Larger battery capacity
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$1,800.9) than the DELTA 3800 Gen4.
- –Significantly heavier (+48.2 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 4,000 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 Yeti PRO 4000 at 115.7 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 Yeti PRO 4000'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
Either unit
Both finish the 1,645 Wh night, the Yeti with 1,750 Wh left and the DELTA 4 (3800) with 1,554 Wh. That gap doesn't pick a winner. The switchover ratings lean the EcoFlow's way, no worse than 10 ms against 15 ms.
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
Both cover the 320 Wh night with most of the battery untouched. Only EcoFlow publishes a noise limit for its unit, and Goal Zero publishes none for the Yeti, so that's the thing to check before either sits by the bed.
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. At these utilization levels the real difference is USB-C for direct laptop charging — 140W on the DELTA 3800 Gen4 against 100W — which beats the inverter for convenience and wastes less energy.
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 cover the 670 Wh with room left. The 67.5 lb box goes to the game and the 115.7 lb one stays home.
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 Yeti is 1,290 Wh short and the DELTA 4 (3800) 1,486 Wh. Both take extra batteries, so plan on one for either.
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: Yeti PRO 4000 runs 16.6h vs 15.6h.
$3,999.95 list · direct from Goal Zero
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 0–226.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–45.3hHigh-Draw Appliances
These reveal the real limitsscale 0–3.4h¹ 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 DELTA 3800 Gen4
I'd build on the DELTA 4 (3800) unless you already run a big fixed array. Both run 3,600 W with a 7,200 W surge and both take extra batteriesA2A6, so the Yeti PRO 4000's 231 Wh head start is smaller than one EcoFlow extra battery. The EcoFlow weighs 67.5 lb against 115.7 lb, is rated for 6,000 cycles against 4,000, and comes to $0.10 per lifetime kWh against $0.25. The Yeti's real edge is solar, 3,000 W of input against 2,000 W, which only a fixed array past 2,000 W will use. That array, or an outage season that can't wait for EcoFlow's late-November shippingA10, flips the call to the Yeti.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of November 4, 2026. The links below open EcoFlow's and Goal Zero's current prices.
$2,199.00 · direct from EcoFlow
or check the Yeti PRO 4000 price$3,999.95 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, 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 Yeti PRO 4000 rates 3.5/5 (14th 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.
Weight Reality Check
Neither unit is grab-and-go. The DELTA 3800 Gen4 (67.5 lbs) is manageable solo but heavier than a large checked suitcase. The Yeti PRO 4000 (115.7 lbs) is firmly a two-person lift. It goes where you put it and stays there. That's a 48 lb difference, and it is paid once — getting the heavier one into position, not every time you move it.
10 ms Against 15 ms, on Paper
The DELTA 4 (3800) is rated no worse than 10 ms and the Yeti PRO 4000 no worse than 15 ms. A router rides through either. A desktop PC with a fussy power supply is where the faster rating is the safer bet. Neither figure is a measurement.
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 Yeti PRO 4000's 1.3, 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.
One Noise Number, and It's a Ceiling
EcoFlow publishes a noise limit for the DELTA 4 (3800) at moderate loads, a level it stays under rather than a best case. Goal Zero publishes no figure for the Yeti PRO 4000. That isn't proof the Yeti is louder. For a bedroom or a CPAP, only the EcoFlow has a number to hold it to.
Full record above — the Test Desk pick is the DELTA 3800 Gen4.
Check DELTA 3800 Gen4 price →or check the Yeti PRO 4000 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.
Delivers each lifetime kWh for $0.15 less — check the DELTA 3800 Gen4 price →
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
Worth knowing
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Goal Zero
Ecosystem
Focused — a compact current line (6th-gen Yeti and Yeti Pro series), the previous-gen X series now out of stock across every model on Goal Zero's own store (checked 2026-09-13: 200X, 500X, 1000X, 1500X, 3000X, 6000X, some listed only as open-box), so buying one new means finding retailer stock, Sherpa power banks for the under-100Wh tier, plus Alta coolers, Nomad/Ranger solar panels, and vehicle integration kits
Support
US-based company (Salt Lake City, owned by NRG Energy). Historically considered premium support, but 2025-2026 reports describe long wait times, unresponsive email communication, and tickets going unaddressed for weeks. The "premium support justifies premium pricing" argument is weakening.
Community
Small but loyal — strong following in overlanding and preparedness communities. Official community forums were recently shuttered, frustrating long-time users.
App experience
Rated 4.4/5 iOS (~1,200 ratings) but recent reviews skew negative — recurring connectivity issues, crashes, and stability problems.
Unique strength
Pioneer of the portable power market — strongest brand heritage. US-based company with ruggedized, weather-resistant designs (IP ratings vary by model). Integrated "Yeti-Ready" ecosystem with coolers, lights, and vehicle kits.
Worth knowing
Typically the priciest brand per watt-hour — though individual pairings vary, and on some pages the Yeti is the cheaper energy. Support quality has declined from its "premium" standard. Perceived as competitively stagnant vs. faster-innovating Chinese competitors. Reliability reports on newer models are concerning.
Analyst note
EcoFlow and Goal Zero are close competitors. Both have established support channels and growing ecosystems. Compare their specific warranty terms and community size for your peace of mind.
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.
Yeti PRO 4000
EXPANDABLESupports Goal Zero expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,994Wh.
Accepts up to 3,000W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are Goal Zero-specific. You're investing in the Goal Zero ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the Yeti PRO 4000's higher solar ceiling (3,000W 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 owns a DELTA 4 (3800) yet. EcoFlow put it on sale in the US on November 4 and ships it in late NovemberA10, so this page works from EcoFlow's US store page and our own arithmeticA1A5A6.
I'd want to see two solar strings feed a grown system. Hypothetically, I'd hang one string on each input, add a DELTA 3 Max Plus battery, and watch whether a clear day holds near the 2,000 W EcoFlow listsA5 and how warm the box runs doing it. That's the test that tells you whether the EcoFlow can keep a bigger bank topped up without the Yeti's extra input.
“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
Goal Zero Yeti PRO 4000
What exists on the Yeti comes mostly from reviewers. They describe a very durable build, a well-liked app and US-based supportB1, and recommend it for RV and camping backupB4. Goal Zero and one reviewer put a full solar charge under two hours on its 3,000 W inputB2.
The owner complaint on file is about 12 V errors. Owner reviews describe a replaced unit and another that stopped charging from solar after a 12 V errorB3. One entry isn't a pattern, but on a box bought for solar it's the one I'd watch.
“Weighs about 115.7 lbs — a two-person unit to move — with one of the most durable builds reviewers have seen, backed by American-based support and a great app.”
Sources
bestgeneratorsolar.com · thesolarlab.com · goalzero.com · business.walmart.co · techradar.com · cleantechnica.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]
- Strong solar input, a great app, American-based support, and a durable build are the praise; heavy weight and some owner reliability reports (12V errors) are the caveats. [Yeti PRO 4000 · 3 entries]
- A1
“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]
- A2
“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]
- 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]
- 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
“Weighs about 115.7 lbs — a two-person unit to move — with one of the most durable builds reviewers have seen, backed by American-based support and a great app.”
bestgeneratorsolar.com / thesolarlab.com — Yeti PRO 4000 review · 2026 · [mixed]
- B2
“3,000W solar input recharges 0-100% in under 2 hours off-grid, with impressive surge and idle efficiency; fully expandable.”
goalzero.com / thesolarlab.com — Yeti PRO 4000 review · 2026 · [positive]
- B3
“Owner reliability is mixed — some report 12V errors, including a first unit returned or replaced and a second that had a 12V error and would not charge from solar.”
business.walmart.com reviews / oliver owner forums — Yeti PRO 4000 · 2026 · [negative]
- B4
“Roughly 3,994Wh capacity; praised for RV and camping backup.”
techradar.com / cleantechnica.com — Yeti PRO 4000 review · 2026 · [positive]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 3800 Gen4 if you…
- →You'll grow it in steps. It takes up to two extra batteries, 4 to 12 kWh in all by EcoFlow's figureA6.
- →It has to move. 67.5 lb against 115.7 lb, for 231 Wh less.
- →The system will cycle daily. 6,000 rated cycles against 4,000.
- →You already own a DELTA Pro 3 extra battery. It plugs into the DELTA 4 (3800) through EcoFlow's adapterA6.
Buy the Yeti PRO 4000 if you…
- →You run a fixed array past 2,000 W. The Yeti takes 3,000 W of solar.
- →It needs to be in the house before late November. EcoFlow ships the DELTA 4 (3800) thenA10, and the Yeti is on sale now at $4,000.
- →You want a US company on the other end of the phone. Goal Zero is based in Salt Lake City.
If neither fits
If all you need is a CPAP and a phone overnight, both are far more than you need. The CPAP night uses 10% of the DELTA 4 (3800)'s usable battery. A much smaller unit does that job at a fraction of the weight.
The Bottom Line
If you'll add batteries anyway, I'd build on the DELTA 4 (3800). It runs the same 3,600 W, grows the same way and weighs 48 lb less, with a higher cycle rating on top.
If your array is already past 2,000 W, or your outage season starts before late November, buy the Yeti PRO 4000. EcoFlow ships the DELTA 4 (3800) thenA10. The Yeti soaks up more sun, and you can buy it today.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
How much is the DELTA 4 (3800) in the US, and when does it ship?
EcoFlow lists it at $2,199 on its US store. It went on sale on November 4, 2026, and EcoFlow says it ships in late November. The Yeti PRO 4000 sells for $4,000.
Can the DELTA 4 (3800) and the Yeti PRO 4000 both add batteries?
Yes. The DELTA 4 (3800) takes up to two of EcoFlow's DELTA Pro 3 or DELTA 3 Max Plus extra batteries, 4 to 12 kWh in all by EcoFlow's figure. The Yeti PRO 4000 takes Goal Zero expansion batteries.
Which one charges faster from solar?
The Yeti PRO 4000, if you have the panels. It accepts 3,000 W against 2,000 W for the DELTA 4 (3800), which splits its input across two ports of 11 to 60 V each. Below 2,000 W of panels, both charge as fast as the panels allow.
Which battery lasts longer?
On paper, the DELTA 4 (3800). EcoFlow rates it for 6,000 cycles and Goal Zero rates the Yeti PRO 4000 for 4,000. At one full cycle a day, that's 16.4 years against 11.
Is the Yeti PRO 4000 worth the extra weight?
Only if you'll use its 3,000 W solar input or need it before the DELTA 4 (3800) ships. It weighs 115.7 lb against 67.5 lb and holds 231 Wh more, and both run 3,600 W.
Where to buy
EcoFlow DELTA 3800 Gen4Pick
$2,199.00
$2,199.00 · direct from EcoFlow
Goal Zero Yeti PRO 4000
$3,999.95
$3,999.95 · direct from Goal Zero
Last checked 31 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.