Head-to-head test
EcoFlow DELTA Pro Ultra + 2 Batteries vs Goal Zero Yeti 1000X
At 405.4 lbs of inverter and battery modules the DELTA Pro Ultra is a fixture you commission, and the 31.68 lb Yeti 1000X is luggage, so settle which of those you're buying before a single spec matters.
Full profiles: EcoFlow DELTA Pro Ultra + 2 Batteries → · Goal Zero Yeti 1000X →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$7,999.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
$999.95 · direct from Goal Zero
Last checked 3 days ago. Prices move — check before you buy.
Spec deltas
The DELTA Pro Ultra with two extra batteries holds 18,432Wh and costs $7,899. The Yeti 1000X holds 983Wh and costs $1,000. That settles the spec argument before it starts, which is why the useful question on this page is not which unit wins.
405.4 lbs is a system weight, not an object. The reviewer who weighed the pieces puts the inverter at 71 lbs and each extra battery at a two-person 115 lbsA8. Take the inverter off the total and 334.4 lbs of battery at roughly 115 lbs a module is three modules, so 18,432Wh split three ways is 6,144Wh a box. You do not lift this. You choose a floor near your panel and it stays there.
The Yeti is a genuinely well-built 31.68 lb box with a problem it cannot talk its way out of: 500 cycles, on NMC cells rather than LiFePO4B1, at $1.02 per Wh. Run both units to their rated cycle limits and the DELTA Pro Ultra's energy costs $0.12 per lifetime kWh against the Yeti's $2.03. If what you want is something you can carry, that is still the wrong thing to carry.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
So the purchase has a second half the price tag does not show. The flicker-free whole-home behaviour owners describe is the version with a home panel wired inA14A9, and for one of them that meant a hard-to-find electrician and a nine-hour day with drywall out of the wallA16A17. The Yeti's installation is setting it on the floor.
p1 weightLbs 405.4 and capacityWh 18,432 are system totals with no per-box fieldreviewer breakdown: 71 lb inverter, 115 lbs per Ultra Smart Extra Battery, two people to move oneA8one owner's electrician needed around nine hours, including cutting drywall to sink the panelA17the same owner found it challenging to find an electrician with experience with this gearA16
Why it mattersIf you cannot name the wall this goes against and the electrician who will wire it, you are not ready to spend $7,899 on it yet.
That makes Remote Workday the only row here where the Yeti's miss is an argument about conversion loss rather than a real gap. Everywhere else it is short by a whole battery or several: 1,264Wh on Weekend Camping, 809Wh on the 8-Hour Blackout, 3,849Wh on Van Life Daily.
the Remote Workday load is 910WhYeti 1000X nameplate capacity is 983Whthe model applies a flat 0.85 derate to every unit, putting the Yeti's usable figure at 836Whthe Yeti's computed shortfall on that scenario is 74Wh
Why it mattersA laptop-and-monitor day is inside the Yeti's real reach if you start full and keep nothing spare; a fridge, a weekend, or a van is not, and no careful use closes those.
rated cycles
And the Yeti's clock runs faster than its own paperwork. At one cycle a day its 500 cycles are spent in 1.4 years, inside the 2-year warranty; the DELTA Pro Ultra's 3,500 cycles take 9.6 years at the same rate, which is most of its 10-year coverage.
Yeti 1000X: 500 cycles, 983Wh, $1.02 per Wh, 2-year warrantyDELTA Pro Ultra: 3,500 cycles, 18,432Wh, $0.43 per Wh, 10-year warrantycomputed rated lifetime energy: 64,512kWh against 492kWhreviewers attribute the 500-cycle rating to NMC cells rather than LiFePO4B1
Why it mattersAnyone cycling daily, whether that is off-grid living, van life or solar time-shifting, should cross the Yeti off whatever else is on the other side of the page.
The specific dimensions that decide these two units — everything else is a tie.
Portability & Form Factor
Selected because: 405.4 lbs against 31.68 lbs is not a spec gap, it is the difference between an appliance you place once and a box you carry.
weight
The Yeti goes in a back seat and comes out with one hand. 31.68 lbs is a heavy carry-on, not a moving job, and it is the one category on this page the DELTA Pro Ultra concedes without argument.
The DELTA Pro Ultra's 405.4 lbs is not one object, so read it as a floor rating and a doorway measurement rather than a lift. It is an inverter plus the battery modules it feeds, and the heaviest single piece a reviewer weighed is 115 lbs against the inverter's 71A8. The practical spec is where it goes, and that decision is close to permanent.
Your Life, Your Pick
Selected because: The Yeti clears two of the six loads modelled here, and the one it misses by 74Wh deserves separating from the one it misses by 3,849Wh.
The scoring model has no class for an installed system, and two rows show it. Weekend Camping and Tailgate Party score the DELTA Pro Ultra as though it drove itself to the site, and it takes both on headroom, spending 13% and 4% of usable capacity against the Yeti's 251% and 80%. A wired appliance sweeping the camping row is telling you about arithmetic, not about camping. That caveat applies to those two rows and nowhere else on this page.
Where the table earns its keep is the difference between a near miss and a rout. The Yeti's 74Wh shortfall on the Remote Workday is smaller than the 147Wh the flat 0.85 derate strips off its 983Wh nameplate, so on nameplate that day fits and once you allow for conversion loss it does not. Its Van Life shortfall is 3,849Wh against a 983Wh battery. Only one of those is an argument worth having.
Lifetime Value
Selected because: $0.12 per lifetime kWh against $2.03 is the table where the price difference reverses.
cost / lifetime kWh
3,500 cycles against 500 turns the $7,899 unit into the cheap one. Across the cycles each is rated for, that is 64,512kWh of lifetime energy against 492kWh, and the per-kWh cost lands at $0.12 against $2.03. The sticker price and the running cost point in opposite directions, and only one of them is still true in year three.
The honest caveat is that this table assumes you use the cycles. Buy the DELTA Pro Ultra for four outages a year and its 3,500 cycles stretch to 33.7 years at weekend use, which is longer than anyone wants the same battery. On that pattern the fairer number is what the price costs per year of coverage: $790 against the Yeti's $500. Cheap to own is a claim about use, not about the box.
What the Specs Don't Tell You
Selected because: Two cards decide this page: what 405.4 lbs actually describes, and what 500 cycles against 3,500 does to a 2-year warranty.
rated cycles
The weight card calls 405.4 lbs a two-person lift. It is not a lift at all. That figure covers an inverter and its battery modules, and the only genuine two-person job inside it is a single 115 lb moduleA8. The advice underneath is still right, for the wrong reason: pick your spot, because this is furniture.
The UPS card is the one to read slowly. The DELTA Pro Ultra does hold connected gear up through a grid cut and the Yeti 1000X has no UPS function, which is the correct call and a real difference. What supports the word seamless, though, is owner descriptionA14A9, not a rated transfer time anyone can hold it to. Believe the direction, discount the adverb.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra + 2 Batteries
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 3,500 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$6,999.1) than the Yeti 1000X.
- –Significantly heavier (+373.7 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
Goal Zero Yeti 1000X
Strengths
- +Costs $6,999.1 less
- +Lighter by 373.7 lb
Trade-offs
- –Weaker inverter (-5,700W) limits appliance compatibility.
- –Shorter-lived battery — rated for 500 charge cycles vs the DELTA Pro Ultra + 2 Batteries's 3,500, 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
Neither unit
Two nights comes to 2,100Wh in this model, and the Yeti's derated usable figure is 836Wh. That is 1,264Wh short, which is not a rationing problem, it is a Saturday-afternoon problem. The DELTA Pro Ultra covers the same weekend on 13% of what it holds, which is what 18,432Wh looks like against a two-night load.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
DELTA Pro Ultra + 2 Batteries
The load is 1,645Wh over eight hours, and the Yeti finishes 809Wh short of it on 836Wh usable, so it covers roughly half the outage. The DELTA Pro Ultra spends 10% of itself on the same eight hours and can carry connected gear through the cut, which the Yeti cannot do at all: anything plugged into it drops when the grid does.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
Either unit
A CPAP is about 40W for eight hours, so both cover the night with room to spare and capacity decides nothing. Fan noise would — but Yeti 1000X doesn't publish a figure, so there's nothing to hold it to. Buy on price, weight, and whether you can live with a fan you haven't heard.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
DELTA Pro Ultra + 2 Batteries
This is the row the Yeti nearly takes. A 910Wh workday fits inside its 983Wh nameplate with 73Wh to spare, and it is the flat 0.85 derate, which removes 147Wh, that leaves it 74Wh short. Read it as it reads: on nameplate the day fits, and once you allow for conversion loss it does not. The DELTA Pro Ultra spends 6% of itself on the same day.
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 1000X
Both units run game day. The Yeti does it at 80% of its 836Wh usable, leaving 166Wh, which is enough margin for the load you planned and none for the one that shows up. The DELTA Pro Ultra spends 4%, so if a second cooler or a griddle appears, only one of these notices.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
DELTA Pro Ultra + 2 Batteries
4,685Wh a day is the load, and the Yeti is 3,849Wh short of it, a gap almost four times the size of its own 983Wh battery. Nothing about careful use closes that. The DELTA Pro Ultra runs the day on 30% and still holds 10,982Wh, another two days of the same 4,685Wh load before anything has to recharge.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: DELTA Pro Ultra + 2 Batteries runs 76.4h vs 4.1h.
$7,999 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 0–1044.5hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–208.9hHigh-Draw Appliances
These reveal the real limitsscale 0–15.7h¹ 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
August 9, 2026
Verdict: the DELTA Pro Ultra + 2 Batteries, on Power Score margin
Buy the DELTA Pro Ultra if you have a house, a spot for it, and an electrician. It holds 18,432Wh behind a 7,200W inverter, covers all six loads modelled here with at least 10,982Wh still in reserve, and at 3,500 cycles and a 10-year warranty it is the cheaper unit to own even at $7,899 against $1,000. The condition is not decoration: the whole-home behaviour people buy this for arrived, for one owner, after a hard-to-find electrician spent around nine hours and cut into drywallA16A17. The Yeti 1000X only makes sense if you have already decided you want a carryable box, and even then 500 cycles at $1.02 per Wh is the weak end of what reviewers benchmark it againstB1B4.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 9, 2026. The links below open EcoFlow's and Goal Zero's current prices.
$7,999.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
or check the Yeti 1000X price$999.95 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated August 9, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): Home Backup, Solar Generator, Tailgating, Food Truck, Apartment Balcony, 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 Pro Ultra + 2 Batteries rates 3.9/5 (36th percentile of 29 Whole-Home / Off-Grid-class units), and Yeti 1000X rates 3.5/5 (11th percentile of 20 Compact-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.
405.4 lbs Is a Floor Plan, Not a Lift
That figure covers the whole system, an inverter plus the battery modules it feeds, not one carryable object. Nobody picks up 405.4 lbs and nobody moves this twice. What the number really tells you is what the floor has to carry, how wide the doorway needs to be, and that the spot you pick is the spot it lives. Pick it near your electrical panel.
Surge Power: Ratio and Ceiling Disagree
The Yeti 1000X holds the higher surge-to-continuous ratio (2× vs 1.5×), but the DELTA Pro Ultra + 2 Batteries holds the higher absolute surge ceiling — 10,800W against 3,000W. These measure different things. The ratio says how much headroom an inverter keeps above its own rating; the ceiling says how big a startup spike it can actually swallow. A motor draws a number of watts at switch-on, not a multiple of someone else's rating, so on raw starting ability the DELTA Pro Ultra + 2 Batteries is the stronger unit here — while the Yeti 1000X is the one running further below its own limit at steady state.
Only One of These Rides Out the Cut
The DELTA Pro Ultra can hold connected gear up through a grid outage. The Yeti 1000X has no UPS function, so a PC, a router or a CPAP plugged into it drops when the power does, and that is the whole comparison. One caution on the word seamless: there is no rated transfer time here worth printing for either unit, so treat this as gear that stays up rather than a number you can hold anyone to.
Warranty Comparison
The DELTA Pro Ultra + 2 Batteries is covered for 10 years against the Yeti 1000X's 2 years. The cheaper Yeti 1000X does buy more warranty per dollar (2 years per $1,000 against 1.3), but that is a statement about price, not about coverage — if a fault appears in year 3, only one of these is still covered. An underrated factor if you're keeping this unit for years.
3,500 Cycles Against 500, and What a Cycle Costs
Cycle counts only compare cleanly when a cycle means the same thing on both units, and here it does not: one DELTA Pro Ultra cycle moves 18,432Wh and one Yeti cycle moves 983Wh, so the years below understate the gap rather than exaggerate it. Run each at a cycle a day and the Yeti reaches its 500-cycle rating in 1.4 years, inside its own 2-year warranty, while the DELTA Pro Ultra takes 9.6 years to reach 3,500. Neither battery dies at that point, both settle to roughly 80% of original capacity. The part that matters is that one of them gets there while it is still under warranty.
Yeti 1000X: Noise Level Not Disclosed
The DELTA Pro Ultra + 2 Batteries publishes its noise level (30dB); the Yeti 1000X doesn't publish one. That isn't evidence the Yeti 1000X 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 Pro Ultra + 2 Batteries's 30dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the Yeti 1000X before deciding.
Full record above — the Test Desk pick is the DELTA Pro Ultra + 2 Batteries.
Check DELTA Pro Ultra + 2 Batteries price →or check the Yeti 1000X 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 Yeti 1000X is cheaper to buy, but the DELTA Pro Ultra + 2 Batteries is cheaper to own. At $0.12/kWh over its lifetime vs $2.03/kWh, the DELTA Pro Ultra + 2 Batteries's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $1.91 less — check the DELTA Pro Ultra + 2 Batteries 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
EcoFlow's advantage on this page is architectural. The DELTA Pro Ultra is an inverter plus battery modules rather than a sealed box, and it accepts 5,600W of solar input, so the bank and the array can both grow without replacing what you already own. Behind it sits the deepest catalogue in portable power and the fastest charging technology in the category.
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 still widely sold, 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
Two companies solving different halves of the problem. EcoFlow ships more models, iterates faster, and builds toward wired home backup with smart panels and modular banks. Goal Zero runs a focused lineup of ruggedised, weather-resistant units with heritage that predates most of the category and an ecosystem of coolers, panels and vehicle kits around it. Neither brand profile decides this page, because these two products are not competing for the same corner of a house.
Growth path
DELTA Pro Ultra + 2 Batteries
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 18,432Wh.
Accepts up to 5,600W 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 1000X
EXPANDABLESupports Goal Zero expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 983Wh.
Accepts up to 600W of solar. Suitable for a 1-2 panel setup.
Adequate ports for most setups, but heavy users may want a power strip.
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 DELTA Pro Ultra + 2 Batteries's higher solar ceiling (5,600W vs 600W) 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 Pro Ultra + 2 Batteries
Field record for this exact two-battery build is thin, and what exists comes from one forum owner, a handful of retailer reviews and press testers rather than people several years inA1A10A15. What that thin record agrees on is the thing you would buy it for. One owner ran a central air conditioner, refrigerator and well pump at once without a flickerA9; another runs most of a house on the two-battery build with no flicker at the changeoverA14; a third says the second battery doubled his runtime and took the anxiety out of an outageA13.
The complaints cluster, and they are worth reading before you spend. Documentation and support are the loudest: no real manual beyond a thin web guide, with support answering the complaint by pointing back at the guide, twiceA2; a suggestion to solve radio interference by putting the unit in a Faraday cageA4; no state-of-charge graph in the app, and support unable to produce one eitherA5. On standby draw, one owner watched the pack read 90% and then fall to 8%A6, and a tester put the system's own idle consumption high enough to empty its 6kWh battery in about 60 hours with no inputA7. Heat is the other theme: one owner measured about 10 degrees between the stacked batteriesA11, and a summer garage reaching 98 is the reason he caredA12. On noise, the one tester who mentioned it never heard a fan at allA15.
“This means that without any grid or solar input, the system would fully drain its own 6kWh battery in about 60 hours. For off-grid use, this parasitic drain must be carefully factored into your energy budget.”
Goal Zero Yeti 1000X
There is no owner record for the Yeti 1000X here, only review-site assessments, so read the next sentence as testing rather than living with itB1B2B3B4. They converge on one verdict: excellent premium build, reliable in both cold and heat, twelve hours on a mini fridge in one testB2, set against a chemistry and price problem it cannot argue away, with NMC cells rated 500 cycles in a market where rivals are quoted at 3,000-plusB1 and a price near $1.02 per Wh that reviewers call out directlyB4.
One practical note beyond that: expansion runs through the Yeti Link system and needs extra cables and adaptersB3. Expandable here means a parts order, not a plug.
“Excellent premium build at about 31.68 lbs; performs reliably — ran a mini fridge for 12 hours and worked in both cold and hot conditions.”
Sources
thepowerpick.com · batteryskills.com · offgridbenchmark.com · pcworld.com · bestgeneratorsolar.com · appleinsider.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
- Owners repeatedly report EcoFlow customer support gives dismissive or unhelpful answers to specific technical questions (manual gaps, RFI interference, app charting). [DELTA Pro Ultra + 2 Batteries · 3 entries]
- The unit's idle/parasitic self-consumption is a recurring theme, both as a documented SoC anomaly and as an acknowledged spec-level drain figure from a tester. [DELTA Pro Ultra + 2 Batteries · 2 entries]
- Multiple owners note the extra battery packs are extremely heavy (100+ lbs each), requiring two people, and one owner separately observed uneven heat between stacked batteries raising summer overheating concerns. [DELTA Pro Ultra + 2 Batteries · 3 entries]
- Real owners with 2-battery setups consistently praise seamless/flicker-free UPS switchover and confirm the system genuinely runs whole-home loads (AC, well pump, most of house). [DELTA Pro Ultra + 2 Batteries · 3 entries]
- Adding a second battery is described by owners as meaningfully extending real-world runtime for whole-home backup, matching expectations. [DELTA Pro Ultra + 2 Batteries · 2 entries]
- Premium build and reliable performance, but held back by 500-cycle NMC chemistry, high price per Wh, and expansion needing extra hardware. [Yeti 1000X · 3 entries]
- A1
“Pulled the trigger on an EcoFlow Delta Pro Ultra (DPU) and I'm kind of meh on it and unlikely to expand or integrate it into the house.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A2
“No real manual. All they have is the web user guide which is superficial if I'm being generous. I asked support about it and they pointed me at the web guide I was complaining about. Twice.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A4
“I contacted EcoFlow support and they told me I could put it in a 'faraday cage'.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A5
“No State of Charge graph in the app... I contacted support and twice they told me to go to the app screen with the charts, which only has input and output.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A6
“After a few days of using it overnight and letting it charge back up to '90%', it'd go from '90%' down to '8%'.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A7
“This means that without any grid or solar input, the system would fully drain its own 6kWh battery in about 60 hours. For off-grid use, this parasitic drain must be carefully factored into your energy budget.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [mixed]
- A8
“The main inverter is a manageable 71 lbs, but each Ultra Smart Extra Battery is a dense 115 lbs, requiring two people for safe movement.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [mixed]
- A9
“We powered a central air conditioner, refrigerator, and well pump simultaneously without a flicker.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [positive]
- A10
“I own two Delta Pro Ultra's with two batteries each... We have experienced matchless performance, scalability, flexibility. It cools/heats itself in temperature extremes-simply awesome!”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A11
“I noticed the battery closest to the inverter seems to run hotter than the one below. About 10 degrees warmer. I switched the batteries around to ensure that it wasn't the battery and got the same results.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [negative]
- A12
“My garage could get up to 98 degrees during the summer, that means my batteries can overheat.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [negative]
- A13
“I originally bought my Delta Pro Ultra with the single battery, worked great is able to power my entire home for about 4 to 5 hours during peak times... I bought a second battery... My run time has doubled eliminating the anxiety.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A14
“With the home panel, there is no flicker when the power changes. I bought a unit with 2 batteries and it runs my most of my house.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A15
“I was pleased to discover the DPU runs completely silent; if a fan kicked on at some point, I never heard it.”
Yahoo Tech — 'EcoFlow Delta Pro Ultra whole home battery backup review' · 2024-06 · [positive]
- A16
“In my neck of the woods (suburban Detroit), it was a bit challenging finding one who had experience with this kind of gear.”
Yahoo Tech — 'EcoFlow Delta Pro Ultra whole home battery backup review' · 2024-06 · [mixed]
- A17
“Sure enough, the job went smoothly; it took him around nine total hours to complete, which included cutting out portions of drywall in order to sink the panel into the wall.”
Yahoo Tech — 'EcoFlow Delta Pro Ultra whole home battery backup review' · 2024-06 · [mixed]
- B1
“Uses lithium NMC cells, not LiFePO4, rated for only 500 cycles to 80% — a disadvantage in a LiFePO4 world where rivals last 3,000+ cycles.”
thepowerpick.com / batteryskills.com — Yeti 1000X review · 2026 · [negative]
- B2
“Excellent premium build at about 31.68 lbs; performs reliably — ran a mini fridge for 12 hours and worked in both cold and hot conditions.”
thepowerpick.com / offgridbenchmark.com — Yeti 1000X review · 2026 · [positive]
- B3
“Expandable via the Yeti Link system to chain multiple units for more capacity, though it requires additional cables and adapters.”
pcworld.com / bestgeneratorsolar.com — Yeti 1000X review · 2026 · [mixed]
- B4
“At about $1.02 per Wh it's pricey — reviewers note LFP rivals offer more capacity for less, charge faster, and last far longer; some also flag middling specs and too few ports.”
appleinsider.com / thepowerpick.com — Yeti 1000X review · 2026 · [negative]
Research compiled August 9, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra + 2 Batteries if you…
- →You own the house, you have sat through a multi-day outage, and you want the fridge, the well pump and the furnace to stay on without anyone going outside to a generator. Owners on the two-battery build describe exactly thatA9A14.
- →You cycle the battery daily, whether that is off-grid living, a workshop running on stored power, or shifting solar into the evening. 3,500 cycles is 9.6 years at a cycle a day, and 18,432Wh means an ordinary day never reaches the bottom of the pack.
- →You have both a place for it and an electrician lined up. That is a real condition, not a footnote: one owner spent around nine hours of a pro's time and some drywall getting it commissionedA16A17.
Buy the Yeti 1000X if you…
- →You want one box you can carry to a campsite, a job site or a tailgate, you will use it a couple of weekends a month, and you like that it is built like a toolB2. At weekend use its 500 cycles run 4.8 years, which may be all you were asking of it.
- →You already own Goal Zero gear, the Nomad or Ranger panels, a Yeti-Ready cooler, a vehicle kit, and staying inside that ecosystem is worth more to you than the price per watt-hour.
If neither fits
If you want a carryable battery and you are not already invested in Goal Zero, close both tabs. The Yeti's $1.02 per Wh and 500 cycles sit at the weak end of what reviewers compare it against, where LFP rivals are quoted at 3,000-plus cycles and more capacity for less moneyB1B4, and the DELTA Pro Ultra is not portable at any weight you would accept. Shop the 1-2kWh LiFePO4 portables instead and spend twenty minutes on cycle ratings before you spend anything else.
The Bottom Line
Take the DELTA Pro Ultra if what you are actually buying is a house battery. It covers all six loads on this page with at least 10,982Wh still in reserve, and priced across the 3,500 cycles it is rated for its energy costs $0.12 per lifetime kWh against the Yeti's $2.03. The catch is the one the spec line hides: 405.4 lbs describes a stack of modules you commission in place, not a unit that starts working the day it arrives.
And if you came here wanting the smaller box, take the honest answer rather than the winner. The Yeti 1000X is well madeB2 and it is 31.68 lbs, but 500 cycles at $1.02 per Wh is a lot to pay for a battery you will be replacing while the DELTA Pro Ultra is still inside its first decade. Buy a modern LiFePO4 portable and stop comparing these two.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can I move the DELTA Pro Ultra with 2 batteries by myself?
No. The 405.4 lb figure is the whole system, and the heaviest single piece a reviewer weighed is a 115 lb battery module that takes two people. Pick a permanent spot on a solid floor near your electrical panel and treat relocating it as a project rather than an afternoon.
Will the Yeti 1000X get my fridge through an overnight outage?
Not the eight-hour blackout modelled here. That load is 1,645Wh and the Yeti's derated usable figure is 836Wh, leaving it 809Wh short, roughly half the outage. Its 1,500W continuous rating and 3,000W surge ceiling are about starting a compressor; the 809Wh is about how long it keeps running afterwards.
Why is the Yeti 1000X so expensive per watt-hour?
$1.02 per Wh buys 500 cycles of NMC chemistry rather than the LiFePO4 rivals reviewers benchmark it against. Spread over the cycles it is rated for, its stored energy works out to $2.03 per lifetime kWh against the DELTA Pro Ultra's $0.12. The premium build is real, but you are paying for the box, not for the energy.
Do I need a home panel to make the DELTA Pro Ultra worth buying?
You need something like it for the whole-home behaviour most people buy this for. Owners describe running most of a house with no flicker at the changeover with a home panel in place, and one owner's install ran around nine hours with an electrician and drywall work. Budget that before you compare the two prices on this page.
Both units say they are expandable. Does that change the answer?
Not here. The Yeti 1000X expands through Yeti Link, which needs additional cables and adapters, and it is expanding out from 983Wh. The DELTA Pro Ultra is already a stack of modules and accepts 5,600W of solar input against the Yeti's 600W, so growth on that side means more panels feeding a bigger bank rather than a second unit sitting beside the first.
Related comparisons
Where to buy
EcoFlow DELTA Pro Ultra + 2 BatteriesPick
$7,999.00
$7,999.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
Goal Zero Yeti 1000X
$999.95
$999.95 · direct from Goal Zero
Last checked 3 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.