Head-to-head test
EcoFlow DELTA 3 Ultra vs Goal Zero Yeti 1500 (6th Gen)
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
EcoFlow
DELTA 3 Ultra
5,450Power Score · The AC & Fridge Zone
$1,199.00 list · direct from EcoFlow
Goal Zero
Yeti 1500 (6th Gen)
2,930Power Score · Appliance Class
$1,499.95 list · direct from Goal Zero
Spec deltas
The EcoFlow DELTA 3 Ultra (3,072Wh) and Goal Zero Yeti 1500 (6th Gen) (1,505Wh) sit in different weight classes. The real question: do your power needs justify the larger unit, or would you be overpaying for capacity that sits unused? We'd buy the DELTA 3 Ultra.
What the spec gap means in practice: the DELTA 3 Ultra's 3,600W inverter can run a window AC unit, a full-size fridge, or power tools. The Yeti 1500 (6th Gen)'s 2,000W inverter will flat-out refuse to start those appliances. On stamina, the DELTA 3 Ultra keeps a fridge alive for roughly 17 hours vs the Yeti 1500 (6th Gen)'s 9 hours. The cost? Portability. At 77.2 lbs, the DELTA 3 Ultra is heavy enough to make you think twice about moving it. The Yeti 1500 (6th Gen) at 52.8 lbs is more manageable, though still not light.
Pick the DELTA 3 Ultra if your primary use is weekend camping or 8-hour blackout. Go with the Yeti 1500 (6th Gen) if you need the heavier-duty specs for demanding loads. Most buyers overlook this: the DELTA 3 Ultra costs ~$0.1/kWh over its full lifespan, which adds up significantly over years of regular use. Keep scrolling for the full breakdown. The scenario verdicts below hold a few surprises.
Bench Notes
What each unit does well, where it falls short, and the trade-offs that matter.
EcoFlow DELTA 3 Ultra
With a massive 3,600W output (and 7,200W surge), the DELTA 3 Ultra can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 77.2 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion. A standout feature is the value proposition: at roughly $0.39 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Costs $301 less
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Significantly heavier (+24.5 lbs), making it harder to move.
Goal Zero Yeti 1500 (6th Gen)
The 2,000W inverter handles most daily devices like laptops, blenders, and TVs, but will struggle with heating elements that require over 1500W. Weighing in at 52.8 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion.
Strengths
- +Lighter by 24.5 lb
Trade-offs
- –Weaker inverter (-1,600W) limits appliance compatibility.
- –Sealed capacity — the DELTA 3 Ultra can add batteries to grow past 1,505.3Wh; this one can't.
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 3 Ultra
The Yeti 1500 (6th Gen) runs out of juice. It only has 1,279Wh usable, but this scenario needs 2,100Wh. The DELTA 3 Ultra covers it and still has 34h of phone charging left over.
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 3 Ultra
The Yeti 1500 (6th Gen) runs out of juice. It only has 1,279Wh usable, but this scenario needs 1,645Wh. The DELTA 3 Ultra covers it and still has 64h of phone charging left over.
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
DELTA 3 Ultra
Both are massively overpowered for CPAP. You're using 25% or less. Save $301 and buy the cheaper unit; the extra capacity is wasted on a 40W medical device. Instead, invest in a second battery for multi-night camping trips.
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 3 Ultra
The DELTA 3 Ultra gives you a comfortable buffer at 35%. Enough to work late, join extra video calls, or charge a second device without worry. The Yeti 1500 (6th Gen) at 71% works but leaves less room for the unexpected. For daily remote work, that peace of mind matters.
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 3 Ultra
Both handle it, but neither is stressed. Tailgating is a light load. The DELTA 3 Ultra's extra margin is nice but not decisive here. Consider weight instead: you're carrying this to a parking lot, and 24 lbs makes a real difference when loading up.
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 can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
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 six 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 3 Ultra runs 12.7h vs 6.2h.
$1,199 list · direct from EcoFlow
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 0–174.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–34.8hHigh-Draw Appliances
These reveal the real limitsscale 0–2.6h¹ 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
July 10, 2026
Verdict: the DELTA 3 Ultra
The DELTA 3 Ultra outperforms the Yeti 1500 (6th Gen) in key areas. It offers more battery capacity (+1,566.7Wh) and higher output (+1,600W). Crucially, it costs $301 less, making it the smarter financial choice.
Overall score margin: 5,450 vs 2,930 (+86.0%)
List prices as of July 10, 2026. The links below open EcoFlow's and Goal Zero's current prices.
$1,199.00 list · direct from EcoFlow
or check the Yeti 1500 (6th Gen) price$1,499.95 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 10, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, Apartment Balcony.
Full specifications
| Specification | DELTA 3 Ultra★ Our pick | Yeti 1500 (6th Gen) |
|---|---|---|
| Price | $1,199.00 Check latest price | $1,499.95 Check latest price |
| Capacity (Wh) | 3072 | 1505.28 |
| Output (W) | 3600 | 2000 |
| Surge Peak | 7200W | 3600W |
| AC Outlets | 6 | 4 |
| USB-C Charging Outputs | 100W | 140W |
| Solar Input (W) | 1600 | 900 |
| Weight (lbs) | 77.2 | 52.75 |
| UPS | Yes (10ms) | Not Specified |
| Charging Cycles | 4000 | 4000 |
| Chemistry | LiFePO4 | LiFePO4 |
| Warranty (Years) | 5 | 5 |
| Battery Expansion Feasibility | Yes | No |
| App Control | Yes | Yes |
| $/Watt Hour | $.39 | $1.00 |
| Noise Level (db) | 30 | Not Specified |
| Solar Input Type | XT60 | HPP 600W + 8mm 300W |
| USB-A Ports | 2 | 2 |
| USB-C Ports | 2 | 4 |
| Cost per Whᵈ | $0.39/Wh | $1.00/Wh |
ᵈ Derived: price ÷ rated capacity.
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.
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.
Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
DELTA 3 Ultra: 77.2 lbs Is a Commitment
At 77.2 lbs, this is manageable but not fun to carry. That's heavier than a large checked suitcase. Moving it from your car to a campsite requires some effort and flat terrain.
Yeti 1500 (6th Gen): Fixed Capacity
The Yeti 1500 (6th Gen) is sealed at 1,505Wh — fine if that covers you, but it's the ceiling. The DELTA 3 Ultra starts at 3,072Wh and can add expansion batteries, so if your needs may climb toward partial-home backup, it has room to grow the Yeti 1500 (6th Gen) doesn't.
UPS Speed: line-interactive (<10ms) vs basic standby
The DELTA 3 Ultra switches to battery in 10ms (line-interactive (<10ms)), while the Yeti 1500 (6th Gen) takes 25ms (basic standby). Safe for desktop PCs, routers, and CPAP machines. NAS drives are protected. This matters if you're using it as a home UPS for always-on equipment.
Yeti 1500 (6th Gen): Noise Level Not Disclosed
The DELTA 3 Ultra publishes its noise level (30dB), but the Yeti 1500 (6th Gen) doesn't. Brands that don't disclose noise specs often have louder units. If noise matters to you (CPAP users, apartment dwellers), this is worth investigating before buying.
Full record above — the Test Desk pick is the DELTA 3 Ultra.
Check DELTA 3 Ultra price →or check the Yeti 1500 (6th Gen) 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.
| Metric | DELTA 3 Ultra | Yeti 1500 (6th Gen) |
|---|---|---|
| Purchase price | $1,199.00 | $1,499.95 |
| Lifetime energy delivery | 12,288 kWh | 6,021 kWh |
| Cost per lifetime kWh | $0.10 | $0.25 |
| Cost per warranty year | $240/yr | $300/yr |
| Battery lifespan | 11yr daily · 38.5yr weekends · 76.9yr weekly | 11yr daily · 38.5yr weekends · 76.9yr weekly |
Analyst note
The DELTA 3 Ultra wins on both sticker price and long-term value. At $0.1/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Delivers each lifetime kWh for $0.15 less — check the DELTA 3 Ultra 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. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also 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 — 5-6 active portable power station models across Yeti and Yeti Pro series, 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 (IPX4). Integrated "Yeti-Ready" ecosystem with coolers, lights, and vehicle kits.
Worth knowing
Widely acknowledged as the most expensive brand (lowest Wh per dollar). 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 3 Ultra
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,072Wh.
Accepts up to 1,600W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
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
The Yeti 1500 (6th Gen) is sealed at 1,505Wh, which is fine if that covers you. The DELTA 3 Ultra starts at 3,072Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the Yeti 1500 (6th Gen) doesn't have if your needs climb toward partial-home backup.
The Bottom Line
The full picture comes down to this. The DELTA 3 Ultra edges ahead on our overall analysis, but the margin is narrow enough that your specific use case should drive the decision. Review the scenario verdicts above — if the Yeti 1500 (6th Gen) wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the DELTA 3 Ultra nor the Yeti 1500 (6th Gen) feels like the right fit, your power needs probably sit outside what these two target. Use our comparison tool above to explore alternatives that better match your specific wattage and runtime requirements. Prices on portable power stations fluctuate frequently. Both EcoFlow and Goal Zero discount regularly, so check the current price before committing. Prime Day and Black Friday pricing typically drops 20-30%.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Yeti 1500 (6th Gen) worth $301 more than the DELTA 3 Ultra?
A tough sell. The Yeti 1500 (6th Gen) offers 24.5 lbs lighter despite higher specs — better engineering, not just bigger batteries, but $301 is a steep premium for a single upgrade. At $0.39/Wh, the DELTA 3 Ultra delivers better bang for your buck. Unless that advantage is non-negotiable, save the cash. Better yet, put it toward a solar panel that pays for itself in free charges.
How does the 1,566.7Wh capacity difference actually affect daily use?
The DELTA 3 Ultra's 3,072Wh battery keeps a mini-fridge running for roughly 17 hours vs the Yeti 1500 (6th Gen)'s 9 hours. Where it really matters: during an 8-hour blackout running your fridge, router, lights, AND charging your phone simultaneously (about 1,645Wh total), the DELTA 3 Ultra handles it while the Yeti 1500 (6th Gen) runs dry. What specs don't mention: runtime drops 20-30% in cold weather (below 32°F/0°C) as battery chemistry slows down. The DELTA 3 Ultra's extra capacity provides a critical cold-weather buffer. For occasional phone and laptop charging, both are overkill. This gap only matters for sustained, multi-appliance use.
Can I actually carry the DELTA 3 Ultra, or is the Yeti 1500 (6th Gen) the only portable option?
Neither is "portable" in any hiking sense. The Yeti 1500 (6th Gen) (52.8 lbs) and the DELTA 3 Ultra (77.2 lbs) are both appliances you place and leave. The 24.5-lb difference matters when loading into a vehicle or moving between rooms, but that's about it. If true portability is your priority, look at units under 20 lbs in a different class entirely.
How fast can each unit recharge from solar panels in real conditions?
On paper, the DELTA 3 Ultra accepts 1,600W vs the Yeti 1500 (6th Gen)'s 900W of solar input. What the spec sheet won't tell you: solar panels typically deliver only 60-80% of their rated output due to panel angle, cloud cover, and temperature. In realistic conditions, expect full recharge in about 2.7 hours for the DELTA 3 Ultra and 2.4 hours for the Yeti 1500 (6th Gen). That gap widens on cloudy days, when the DELTA 3 Ultra's higher input ceiling captures more of whatever sunlight is available. One more thing: summer gives you ~7 productive solar hours per day. Winter drops to ~4. If solar is your primary recharge method, the DELTA 3 Ultra's advantage is substantial.
Can I use the DELTA 3 Ultra as a home UPS to protect my electronics during blackouts?
Yes. The DELTA 3 Ultra has UPS mode with true 0ms switchover (double-conversion). Even hospital-grade equipment won't notice. Plug in your desktop PC, router, NAS, or CPAP machine and it switches to battery seamlessly when the grid drops. The Yeti 1500 (6th Gen) does not have this feature. Without UPS, a blackout means: your PC reboots (potentially corrupting unsaved work), your NAS may corrupt its drive array, your CPAP alarms and wakes you up, and your security cameras go dark until you manually switch them over. If always-on power protection matters, this is a dealbreaker advantage for the DELTA 3 Ultra.
What if I need more capacity than the Yeti 1500 (6th Gen)'s 1,505.3Wh later?
The Yeti 1500 (6th Gen) is sealed at 1,505.3Wh, so if you expect your needs to climb, the DELTA 3 Ultra is the more future-proof pick: it starts at 3,072Wh and adds EcoFlow-compatible batteries without replacing the base unit. That said, "not expandable" isn't a flaw on its own — if 1,505.3Wh comfortably covers your loads, the Yeti 1500 (6th Gen) is a complete unit, not a downgrade.
Is EcoFlow or Goal Zero more reliable for long-term ownership?
Both brands have strengths and trade-offs. EcoFlow: Mixed. 2-5 years depending on model (DELTA Pro Ultra line gets 10 years). Some users report smooth claims; others report runarounds. Register your product to extend coverage. Goal Zero: 5 years on LFP models, 2 years on older NMC models. Battery must be charged within 7 days of purchase and every 6 months to maintain warranty (strict). Product reliability concerns have increased — repeat "Battery Fault" errors reported even on newer Yeti Pro 4000. One piece of advice from the power station community: regardless of brand, buy from Costco or Amazon. Their return policies provide a safety net that manufacturer warranties alone can't match, especially for a product you'll rely on in emergencies. Both brands use LFP (lithium iron phosphate) batteries in their current lineup, the most proven chemistry for longevity and safety.
Bottom line: should I buy the DELTA 3 Ultra or the Yeti 1500 (6th Gen)?
We'd buy the DELTA 3 Ultra. Cheaper and more capable. That combination is rare. The Yeti 1500 (6th Gen) doesn't offer a compelling reason to spend more unless you specifically need a feature unique to the Goal Zero ecosystem (expansion batteries, app integrations). Otherwise, clear call.
Where to buy
EcoFlow DELTA 3 UltraPick
$1,199.00
$1,199.00 list · direct from EcoFlow
Goal Zero Yeti 1500 (6th Gen)
$1,499.95
$1,499.95 list · direct from Goal Zero
Prices may vary by retailer and are subject to change.