Head-to-head test
EcoFlow DELTA 2 vs Goal Zero Yeti 1500 (6th Gen)
EcoFlow retired the DELTA 2, so the axis isn't which unit is better: it's whether the Yeti 1500's 1,279Wh of usable energy and 3,600W ceiling are what you actually need, or whether you wanted a 27 lb box and should be shopping EcoFlow's replacement instead.
Full profiles: EcoFlow DELTA 2 → · Goal Zero Yeti 1500 (6th Gen) →
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
EcoFlow no longer sells the DELTA 2. Its store page now forwards to the DELTA 3, the replacement EcoFlow names itself, which leaves this comparison with exactly one buyable side: the Goal Zero Yeti 1500 (6th Gen), at $1,500. If you came here to pick between two units, a catalogue change has already picked for you.
The specs are still worth laying side by side, because plenty of DELTA 2s are sitting in closets, truck beds and basements, and the people who bought them are most of why this page still earns its traffic. The Yeti is the bigger box in every direction that matters: 1,505Wh against 1,024Wh, 2,000W continuous against 1,800W, a 3,600W surge ceiling against 2,700W, and 900W of solar input against 500W. It's also 52.75 lbs against 27, which is the whole trade in one line.
The Yeti's weak spots belong before the verdict rather than after it. It's sealed at 1,505Wh with no expansion path, its 6mm accessory port is proprietary and won't accept the older Yeti Tank batteriesB9, it publishes no noise figure at all, and a minority of retailer reviewers describe a unit that stopped accepting 120VAC, solar and 12V input alike, with slow support behind itB10B11. That's the box this page recommends, and part of why it recommends it is that you can still buy it.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
What the extra money buys isn't 481Wh of nameplate (1,505 minus 1,024), it's 409Wh of usable energy (1,279 minus 870), and that's the difference between trimming one small appliance and not thinking about it. Run the numbers further and the Yeti takes the 910Wh workday and a full 320Wh CPAP night back to back on one charge, 1,230Wh against 1,279Wh usable, with the DELTA 2 out of the running before dinner.
DELTA 2: 1,024Wh nameplate, 870Wh usable after the flat 85% derateRemote Workday profile needs 910WhYeti 1500 (6th Gen): 1,505Wh nameplate, 1,279Wh usable
Why it mattersIf your real daily load lands between 870Wh and 1,279Wh, stop comparing nameplates and compare the derated figures, because that band is exactly where these two separate.
continuous output
Nothing on this page's scenario list asks either box for more than 400W of startup, so that 900W of extra ceiling is insurance against the load you haven't written down: the microwave, the shop vac, the well pump that wants two to three times its rated draw for a half second. Fridge and AC compressors are the usual culprits, and 2,700W is a real ceiling too, just a lower one.
Yeti 1500 (6th Gen): 2,000W continuous, 3,600W surge, a 1.8x ratioDELTA 2: 1,800W continuous, 2,700W surge, a 1.5x ratioThe heaviest startup draw in any scenario on this page is 400W, at the tailgate
Why it mattersLook up the startup draw of the single heaviest motor you plan to run and check it against 2,700W and 3,600W. If nothing you own comes close, surge is not what should decide this.
Then the retirement removes even that. An upgrade path whose front door is a base unit the maker has stopped selling isn't a path anyone reading this can enter, which turns the DELTA 2's one structural advantage into a feature that only helps the people who already have one. For a new purchase the actual options are the Yeti's sealed 1,505Wh or EcoFlow's current range.
DELTA 2 accepts EcoFlow expansion batteries; the Yeti 1500 (6th Gen) is sealed at 1,505WhThe DELTA 2 starts 481Wh below the Yeti (1,024Wh against 1,505Wh)EcoFlow retired the DELTA 2 on 2026-09-18 and names the DELTA 3 as its replacement
Why it mattersIf you're shopping rather than deciding what to do with a unit you already own, take expandability off your comparison entirely, and size the box for the load you'll have in five years.
At CPAP load neither box is anywhere near the load where either one's fans were reported to spin upA1B1, so the missing figure costs the Yeti nothing for the use where noise matters most. The place it does cost you is the one nobody checks: recharging at full tilt in the same room, where the DELTA 2 at least gave you an app slider to trade charge speed for quietA2 and the Yeti gives you a number nobody has published.
EcoFlow publishes 50dB for the DELTA 2; Goal Zero publishes no noise figure for the Yeti 1500 (6th Gen)DELTA 2 fans trigger above about 120W and run continuously at roughly 48-55dB at 1,500-1,800WA1A CPAP is about 40W, so a night is roughly 320Wh, 37% of the DELTA 2's usable energy and 25% of the Yeti's
Why it mattersCPAP buyers can ignore the noise column here. Anyone who'll fast-charge in a bedroom or a studio apartment should listen to one before committing, or find someone who has, because the spec sheet won't answer it.
The specific dimensions that decide these two units — everything else is a tie.
Runtime: Will It Power Your Gear?
Selected because: The real gap is 409Wh of usable energy (1,279Wh against 870Wh after the flat 85% derate), which is the difference between clearing the 910Wh workday and missing it by 40Wh.
continuous output
Neither of these is a whole-house box, and the runtime table is where that stops being an opinion. The 8-hour blackout profile wants 1,645Wh: the Yeti covers 78% of it and the DELTA 2 53%, so the honest framing is how far into the evening you get before the fridge conversation starts, not whether you sail through. Weekend camping at 2,100Wh is 61% and 41% respectively. Both numbers come off a flat 85% usable allowance applied to every unit on the site, not a measurement of either one.
Where the Yeti earns the gap is the middle band. It clears the 910Wh workday with 369Wh left and the 670Wh tailgate with 609Wh left, which means one charge covers a working day and the evening that follows it. The DELTA 2 passes the tailgate with 200Wh in hand and comes 40Wh short of the workday. Size for the load you actually have and that 409Wh usable difference either decides everything or nothing at all.
Growth Path
Selected because: Expandability was the DELTA 2's structural card, and its front door is now a unit EcoFlow has stopped selling.
solar input
Expandable used to be the DELTA 2's answer to being the smaller box, and the arithmetic was always awkward: at 1,024Wh it starts 481Wh below the Yeti, so the first expansion battery mostly buys back capacity the Yeti includes in the base price. You only come out ahead past 1,505Wh, which is a long way to travel to win.
The retirement settles it. You can't start a growth path by buying a base unit the maker no longer sells, so the DELTA 2's expandability is now a fact about the installed base rather than an option for shoppers. The Yeti, for its part, makes no pretence: 1,505Wh sealed, no compatibility with the older Yeti Tank batteries, and a proprietary 6mm accessory portB9. Buy it at the size you need, because that size is permanent.
Portability & Form Factor
Selected because: 52.75 lbs against 27 is what the extra 481Wh costs, and it's paid every time the box leaves the house.
weight
52.75 lbs is a two-hands, bent-knees lift, and the 25.75 lbs it carries over the DELTA 2 (52.75 minus 27) is almost the entire weight of the DELTA 2 again. In practice that's the difference between a box you pick up on the way out the door and a box you plan a trip around: trunk to tailgate is fine, trunk to campsite twice is a decision, down basement stairs is a favour you ask someone.
What you get for the weight is a unit built to be treated badly. The aluminium enclosure came through rocky roads and an endless run of speed bumps intact and reads as tool-like rather than appliance-likeB6, which is the right trade for a truck bed and the wrong one for a hiking-adjacent campsite. The DELTA 2's 27 lbs was its best argument, and it's the argument that left the catalogue with it.
Brand Trust
Selected because: Both records carry five-year terms, but EcoFlow has retired its side of this page and offers no parts or service out of warranty, while Goal Zero's support has slipped from its old premium standard.
You're buying a repair relationship, not just a box, and this is where the two brands actually differ. Both records carry a five-year term, so coverage is a tie on paper. Behind the paper, EcoFlow offers no parts or service once a unit is out of warranty, which is worth knowing about a model the company has now retired, and Goal Zero's support has drifted from the premium standard that justified its pricing, with long waits and unanswered tickets through 2025 and 2026.
The evidence splits along the same line. The Yeti's professional reviews are consistently positive and the unit is new enough that nobody has a multi-year record of itB0, while a minority of retailer reviewers describe total charge failure across all three inputs and firmware updates that broke connectivityB10B11. The DELTA 2 has the deeper record, years of it, and its worst recurring complaint is fan noise rather than failureA0A1. That's the uncomfortable shape of this page: the better-documented unit is the one you can't buy, and its replacement, the DELTA 3, is where that track record continues.
What the Specs Don't Tell You
Selected because: Two cards here change decisions: the surge ceilings (3,600W against 2,700W) and the fact that the only published noise figure belongs to the unit that's no longer sold.
rated cycles
Read the surge cards as two ceilings rather than two grades of inverter. The Yeti's 1.8x surge-to-continuous ratio beats the DELTA 2's 1.5x, but neither clears the 2x rule of thumb, and what decides whether your fridge starts is the absolute number: 3,600W against 2,700W. Check the startup draw of the heaviest motor you own against both figures instead of trusting the ratio.
The cycle-life card is the one place the Yeti's price buys something durable. 4,000 rated cycles against 3,000 is 11 years of daily use against 8.2, but cycles are the wrong unit when the packs are different sizes: count energy instead and it's roughly 6,021 kWh over the Yeti's rated life against 3,072 kWh. Neither battery dies at the limit, it drops to about 80% of original capacity, which on a box this size is still a usable station.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Lighter by 25.8 lb
Trade-offs
- –Shorter-lived battery — rated for 3,000 charge cycles vs the Yeti 1500 (6th Gen)'s 4,000, so it wears out sooner.
Goal Zero Yeti 1500 (6th Gen)
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Significantly heavier (+25.8 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
Neither unit
Neither unit covers this scenario's 2,100Wh: the DELTA 2 comes up 1,230Wh short (about 41% covered), the Yeti 1500 (6th Gen) 821Wh (61%). Treat this as partial cover — enough for the essentials in it, not the whole list.
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
Neither unit
Neither unit covers this scenario's 1,645Wh: the DELTA 2 comes up 775Wh short (about 53% covered), the Yeti 1500 (6th Gen) 366Wh (78%). Either gets you most of the way, so this is a scenario you plan around rather than one you should rule them out for.
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, so eight hours is roughly 320Wh: 37% of the DELTA 2's 870Wh usable and 25% of the Yeti's 1,279Wh. Capacity decides nothing here, and neither does the noise column, since the only published figure belongs to the unit that's no longer sold. What's left is the margin at dawn. The Yeti still holds 959Wh, which is the next night and most of the one after, and it's the box you can still put on the nightstand.
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
Yeti 1500 (6th Gen)
910Wh is the load, and it lands in the one band where these two genuinely separate. The Yeti clears it with 369Wh to spare. The DELTA 2 finishes 40Wh under, and only because of the derate: its 1,024Wh nameplate covers the day, and the flat 15% conversion allowance is what tips it below the line. Forty watt-hours is one small appliance's worth across a day, useful to know if you own a DELTA 2 and no comfort to a shopper, because the unit that needs no trimming is also the only one still sold.
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
Yeti 1500 (6th Gen)
Game day is a light load, and both boxes take it: 670Wh against 1,279Wh usable on the Yeti and 870Wh on the DELTA 2, finishing with 609Wh and 200Wh respectively. So the figure you'll actually feel is the 52.75 lbs from the trunk to the setup spot, a two-hands lift where the DELTA 2's 27 lbs was a one-hand carry. The lighter box is the one that left EcoFlow's range, so plan the Yeti's weight in rather than around it.
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 unit covers this scenario's 4,685Wh: the DELTA 2 comes up 3,815Wh short (about 19% covered), the Yeti 1500 (6th Gen) 3,406Wh (27%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
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 1500 (6th Gen) runs 6.2h vs 4.2h.
Sold on Amazon
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 0–85.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–17.1hHigh-Draw Appliances
These reveal the real limitsscale 0–1.3h¹ 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
September 19, 2026
Verdict: the Goal Zero Yeti 1500 (6th Gen)
Buy the Goal Zero Yeti 1500 (6th Gen), and know that it wins partly by being the only unit here EcoFlow hasn't retired. On merit it still holds up for anything running a real load: 1,279Wh usable against the DELTA 2's 870Wh clears the 910Wh remote-workday profile with 369Wh in reserve where the DELTA 2 finishes 40Wh under, and 4,000 rated cycles against 3,000 works out to roughly 6,021 kWh of lifetime energy against 3,072. Two things should send you elsewhere. If what drew you to the DELTA 2 was a 27 lb expandable box rather than 1,505Wh, start with EcoFlow's named replacement, the DELTA 3, instead of paying premium money for capacity you won't use. And if you're buying the Yeti, go in knowing Goal Zero's support reputation has slipped from its old premium standard, and that a minority of retailer reviewers report units that stopped accepting charge on every inputB10B11.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open Goal Zero's current price.
Sold on Amazon · today’s price is on the listing
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated September 19, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): Camping.
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 rates 4.1/5 (50th percentile of 27 Everyday-class units), and Yeti 1500 (6th Gen) rates 3.4/5 (4th percentile of 27 Everyday-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.
DELTA 2: 50dB Published
50dB is about as loud as moderate rainfall. It is EcoFlow's own rating rather than a reading on a shared bench — makers differ on whether they quote a best case or a figure under load, so treat it as a starting point rather than what you would hear at a bedside. For most people, fan noise around 45dB and up is where sleep starts to suffer.
Yeti 1500 (6th Gen): Fixed Capacity
The Yeti 1500 (6th Gen) is sealed at 1,505Wh, and that is the ceiling. Normally the counterpoint would be that the DELTA 2 can add expansion batteries, but that isn't a live option here: the DELTA 2 is no longer sold, and EcoFlow points owners to the DELTA 3. For a new purchase the expansion question doesn't arise between these two, so the Yeti 1500 (6th Gen)'s fixed 1,505Wh is simply what you get.
Surge Power: Inverter Quality Indicator
The Yeti 1500 (6th Gen) has a 1.8× surge-to-continuous ratio vs the DELTA 2's 1.5×, and the higher absolute ceiling with it — 3,600W against 2,700W. Neither clears the 2× rule of thumb usually quoted for motor startups, so read these as two ceilings rather than two grades of inverter. What decides whether a given motor starts is the ceiling, not the ratio: the DELTA 2 still surges to 2,700W, so check the startup draw of the heaviest thing you plan to run against that figure rather than assuming it trips.
UPS: Two Rated Ceilings, No Measurements
Both units list a UPS mode with a published ceiling: no worse than 15ms on the Yeti, no worse than 20ms on the DELTA 2. Neither is a lab result, and five milliseconds of rated difference is not something you'll perceive. What you will notice is whether the desktop under your desk rides through the handover, because the fussiest PC power supplies sit right around this class on both units. For a router, a modem, a NAS or anything on a wall wart, both are fine on paper.
Warranty: Same Five Years, Different Futures
Both records carry a five-year term, so the paper coverage is identical and it decides nothing. What differs is what stands behind it. The Yeti's five years start the day you buy it, from a maker still selling the model, still stocking its accessories, and still answering tickets about it. The DELTA 2's five years run from whenever it was bought, on a model EcoFlow has now retired, and EcoFlow's published terms offer no parts or service once a warranty has expired. Same number on both rows. Only one of them is still a promise you can take out.
Battery Lifespan in Real Years
The Yeti 1500 (6th Gen) is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. One caution reading years across different sizes: a cycle is 1,505Wh on the Yeti 1500 (6th Gen) and 1,024Wh on the DELTA 2, so count lifetime energy — roughly 6,021 kWh against 3,072 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.
Yeti 1500 (6th Gen): Noise Level Not Disclosed
The DELTA 2 publishes its noise level (50dB); the Yeti 1500 (6th Gen) doesn't publish one. That isn't evidence the Yeti 1500 (6th Gen) is louder — it means there's no figure to hold it to, and no way to compare the two on this without hearing them. If you're buying for a bedroom, a CPAP, or an apartment, treat the DELTA 2's 50dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the Yeti 1500 (6th Gen) before deciding.
Full record above — the Test Desk pick is the Yeti 1500 (6th Gen).
Check Yeti 1500 (6th Gen) price →Ownership 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 is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the Yeti 1500 (6th Gen) works out at $0.25/kWh over its rated life. If you already own the DELTA 2, the hardware comparison still holds: over its rated life the DELTA 2 delivers about 3,072 kWh and the Yeti 1500 (6th Gen) about 6,021 kWh.
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
The clause that matters on this page: EcoFlow offers no parts or service once a unit is out of warranty. That's a general policy, not a reaction to any one model, but it lands differently on a station the company has stopped selling, so a second-hand DELTA 2 is a box you should expect to own as-is.
Goal Zero
Ecosystem
Focused rather than broad. The current catalogue is the 6th-gen Yeti and Yeti Pro stations, Sherpa power banks for the under-100Wh tier, Nomad and Ranger solar panels, Alta coolers and vehicle integration kits. It's a narrow line by this category's standards, and it's built to hang together as a Yeti-Ready kit rather than to cover every price point.
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
One of these brands still sells the unit in the column beside it, and on this page that's most of the brand story. Past that, the two are mirror images: EcoFlow has the deeper current range, the faster innovation cadence and by far the larger user community to search when something goes wrong, while Goal Zero is the older US company with a narrow, rugged line, a shuttered community forum and a support reputation that no longer justifies the premium the way it once did. Neither picture is flattering in the same place, so weigh whichever you'd lean on: a big community and no out-of-warranty service, or a small one and a service desk that has been slow to answer.
Growth path
DELTA 2
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Yeti 1500 (6th Gen)
FIXED CAPACITYFixed at 1,505Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 900W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Growth only counts if you can still buy in, and the DELTA 2 is no longer sold (EcoFlow points owners to the DELTA 3). That leaves the Yeti 1500 (6th Gen): it is sealed at 1,505Wh, so buy the size that covers you now. The DELTA 2's expandability still matters if you already own one, but it isn't a reason to pick it over the Yeti 1500 (6th Gen).
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 2
Fan noise is the DELTA 2's one repeated complaint, and it's specific rather than vague. The fans trigger above about 120W, and at 1,500-1,800W they run continuously at roughly 48-55dB, which is why powering medical gear above 120W in a bedroom turns into a choice between listening to it and running an extension cord out of the roomA1. At 1,200W of charging one reviewer put it at gaming-laptop volume, with the app's charge-speed slider as the fixA2. EcoFlow said it intended to address the noise in firmware, a promise worth treating as unresolved now that the model has left the rangeA4.
Otherwise the record is good and, more usefully, deep, which is what years on the market buy. Months of outages, camping trips and daily home-office use came back citing fast charging, LiFePO4 reliability and expandability as the headline strengthsA3, and our own coverage note reads reviewer consensus as consistent on reliability and value with fan noise as the lone recurring gripeA0.
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
Sources
portablepowerlab.com
Goal Zero Yeti 1500 (6th Gen)
The Yeti 1500 (6th Gen) launched around March 2026, so there is no long-term ownership record yet and what exists comes from hands-on reviewers plus a small retailer review aggregate rather than multi-year ownersB0. What they found matches Goal Zero's claims: a wall charge from empty in just over an hourB2, a CPAP night that ended with more than 60% still in the packB4, and a mains-to-battery handover that kept a modem and router alive through a winter stormB5. The aluminium enclosure survived rocky roads and speed bumps and feels tool-like in the hand, though one reviewer found the styling dated next to its competitorsB6B7.
Two cautions. Solar is where the marketing outran the field: against a claimed 4.5-hour recharge, 6 to 8 hours was called realistic once clouds and imperfect panel angles entered the pictureB3, and the fans become audible near the 2,000W limit, described as noticeable in a quiet room rather than loudB1. The sharper one is reliability. A minority of retailer reviewers report a unit that stopped accepting 120VAC, solar and 12V input alike alongside unsatisfying service, and connectivity and charging trouble after a firmware updateB10B11. Against an otherwise positive professional consensus that's a minority signal, but it's the one to weigh at this price.
“When pushing the inverter near its 2,000W limit, the internal cooling fans become audible — not loud, but noticeable in a quiet room.”
Sources
exploreandrenovate.com · wattsourcer.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Fan noise under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 · 3 entries]
- Real-world charging speed, CPAP endurance, and UPS backup performance consistently match or beat Goal Zero's marketing claims in hands-on tests, though solar recharge time runs slower than advertised once conditions aren't ideal. [Yeti 1500 (6th Gen) · 4 entries]
- Reviewers flag the unit's price and near-60-lb weight as barriers, and its proprietary 6mm port ecosystem plus incompatibility with older Yeti Tank batteries as an ecosystem lock-in concern. [Yeti 1500 (6th Gen) · 2 entries]
- A minority of REI buyers report serious reliability failures (total charging failure across all input types) paired with unsatisfying customer service, plus firmware-update-triggered connectivity problems — a contrast to the otherwise positive professional-review consensus. [Yeti 1500 (6th Gen) · 2 entries]
- A1
“Fans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld — EcoFlow Delta 2 review · 2026 · [negative]
- A2
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
PCWorld — EcoFlow Delta 2 power station review · 2026 · [mixed]
- A3
“After 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use · 2026 · [positive]
- A4
“EcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”
portablepowerlab.com — EcoFlow Delta 2 Review · 2026 (dated claim — may be partially addressed) · [mixed]
- B1
“When pushing the inverter near its 2,000W limit, the internal cooling fans become audible — not loud, but noticeable in a quiet room.”
exploreandrenovate.com — "Goal Zero Yeti 1500 Worth Buying? Honest Pros & Cons Analysis" · 2026 · [mixed]
- B2
“A full charge from 0 to 100% completes in just over an hour via wall power.”
Popular Science — "Goal Zero Yeti 1500 6G review: A rugged portable power station that isn't afraid to get dirty" · 2026 · [positive]
- B3
“Goal Zero claims a 4.5-hour full recharge from solar, but in more typical conditions with some cloud movement and sub-optimal angles, 6-8 hours is a more realistic expectation.”
exploreandrenovate.com — "Goal Zero Yeti 1500 Worth Buying? Honest Pros & Cons Analysis" · 2026 · [mixed]
- B4
“I ran a CPAP machine overnight, which left me with more than 60% capacity in the morning.”
Popular Science — "Goal Zero Yeti 1500 6G review: A rugged portable power station that isn't afraid to get dirty" · 2026 · [positive]
- B5
“The transition from mains to power bank worked seamlessly as you'd hope — it kept the modem and router running through a winter storm.”
Popular Science — "Goal Zero Yeti 1500 6G review: A rugged portable power station that isn't afraid to get dirty" · 2026 · [positive]
- B6
“The aluminum enclosure gives a premium, tool-like feel, and the unit survived rocky roads and over the seemingly endless number of speed bumps without issue.”
Popular Science — "Goal Zero Yeti 1500 6G review: A rugged portable power station that isn't afraid to get dirty" · 2026 · [positive]
- B7
“The design isn't as modern or appealing as other competitors.”
Popular Science — "Goal Zero Yeti 1500 6G review: A rugged portable power station that isn't afraid to get dirty" · 2026 · [negative]
- B9
“The 6mm port ecosystem is proprietary, limiting accessory options, and the unit is not compatible with older Yeti Tank expansion batteries.”
wattsourcer.com — "Goal Zero Yeti 1500 Review (2026)" · 2026 · [negative]
- B10
“The unit stopped accepting charges via 120VAC, solar, and 12V inputs, resulting in complete system failure, and the owner reported less than satisfactory customer service from Goal Zero.”
REI customer reviews — Goal Zero Yeti 1500 Portable Power Station product page (review aggregate) · unknown · [negative]
- B11
“Experienced connectivity and charging issues after a firmware update.”
REI customer reviews — Goal Zero Yeti 1500 Portable Power Station product page (review aggregate) · unknown · [negative]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA 2 if you…
- →You already own a DELTA 2 and you're wondering whether the Yeti is the upgrade: not unless your loads have climbed past 870Wh usable. At 3,000 cycles, weekend use runs about 28.8 years, so the box you own is not the thing about to fail.
- →You own one and want more capacity: the EcoFlow expansion battery route is still the DELTA 2's own path and the only way that unit grows. Go in knowing the first battery largely buys back capacity a 1,505Wh unit ships with, so it's worth it only if you're heading well past that.
Buy the Yeti 1500 (6th Gen) if you…
- →You work a full day off the grid and want the evening too: the remote-workday profile comes to about 910Wh, and 1,279Wh usable clears it with 369Wh spare instead of leaving you 40Wh short and rationing.
- →The box lives in a truck bed and gets treated like a tool: the aluminium enclosure came through rocky roads and speed bumps without complaintB6, and 52.75 lbs is fine when it's a tailgate lift rather than a walk.
- →You want the modem, router and a lamp to ride through a storm without anyone noticing: the Yeti is rated no worse than 15ms on the handover, and in testing it carried a modem and router through a winter stormB5.
If neither fits
If your day looks like the van-life profile at 4,685Wh, close the tab. The Yeti covers 27% of it and the DELTA 2 19%, and no amount of careful planning fixes a 3,406Wh shortfall. You want a station built for that load, or a wired 12V lithium house bank with a proper inverter. And if what you actually wanted was the DELTA 2 specifically, a 27 lb box you could add to later, don't pay Yeti money for 1,505Wh you won't use and don't go hunting leftover retailer stock on a discontinued model. Start with EcoFlow's named replacement, the DELTA 3.
The Bottom Line
Take the Yeti 1500 (6th Gen), because it's the only one of these two you can buy and because it's the right box for the loads people actually bring to this comparison. The 409Wh of extra usable energy is the whole argument: it turns a 910Wh workday from a 40Wh miss into a day with 369Wh still in reserve, and it does it with 900W of solar input to put back what you took out.
The DELTA 2 was a good unit and the record says so, fan noise and all. It just isn't a recommendation any more, and the unit that inherits the recommendation is the DELTA 3. If 1,505Wh is more than your evening needs, go read about that one instead. If it isn't, buy the Yeti and plan for the 52.75 lbs before it's in your hands rather than after.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 2 discontinued?
Yes. EcoFlow retired it on 2026-09-18 and its store page now forwards to the DELTA 3, which EcoFlow names as the like-for-like replacement. Retailer stock may still turn up, but the maker has moved on, and EcoFlow offers no parts or service once a unit is out of warranty. That's the fact to weigh before buying old stock at any price.
Can the Goal Zero Yeti 1500 (6th Gen) run a CPAP all night?
Comfortably. A CPAP draws about 40W, so eight hours is roughly 320Wh against 1,279Wh usable, leaving 959Wh in the pack at dawn, and a reviewer who ran one overnight finished with more than 60% left. The one thing you can't check on the spec sheet is fan noise, because Goal Zero doesn't publish a figure for this unit.
Does the Yeti 1500 (6th Gen) work as a UPS for a computer?
It lists a UPS mode rated no worse than 15ms, which is a published ceiling rather than a measured result. Routers, modems and most consumer electronics ride through that class without noticing, and in testing the handover kept a modem and router alive through a winter storm. The fussiest desktop power supplies sit right around this line, so if unsaved work is the thing you're protecting, treat it as probable rather than guaranteed.
Can you add a battery to the Yeti 1500 (6th Gen)?
No. It's sealed at 1,505Wh with no expansion option, it isn't compatible with the older Yeti Tank expansion batteries, and its 6mm accessory port is proprietary, which narrows your accessory choices too. Buy it at the capacity you need, because that's the capacity you keep.
What should I buy instead of the DELTA 2?
EcoFlow points DELTA 2 shoppers at the DELTA 3, so that's the first place to look if you wanted that size and shape of unit. If you need more than 1,024Wh of nameplate capacity or a 3,600W surge ceiling, the Yeti 1500 (6th Gen) is the live answer on this page. Between them, the deciding question is whether you need 1,505Wh or you needed 27 lbs.
Where to buy
EcoFlow DELTA 2
No longer sold
Goal Zero Yeti 1500 (6th Gen)Pick
Sold on Amazon · today’s price is on the listing
Prices may vary by retailer and are subject to change.