Head-to-head test
EcoFlow DELTA 3 Max vs EcoFlow DELTA 3 Ultra Plus
The Ultra Plus is the Max scaled up by about half: battery, inverter and surge. The price grows by more than that. On top of the size, the extra money buys a solar port more than three times larger.
Full profiles: EcoFlow DELTA 3 Max β Β· EcoFlow DELTA 3 Ultra Plus β
Looking for a different matchup? EcoFlow DELTA 3 Max Plus vs DELTA 3 Ultra Plus Β· EcoFlow DELTA 3 Ultra vs DELTA 3 Ultra Plus Β· EcoFlow DELTA 3 Max Plus vs DELTA 3 Ultra
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Where I live, in a redwood canyon, a storm can take the power for days. So the first row I'd read on this pair is the 8-hour blackout. Both units get through the night. The DELTA 3 Max finishes with 96Wh left, close to empty. The DELTA 3 Ultra Plus finishes with 966Wh, more than half of a second night.
Then the sun comes up, and the solar port decides how much of the night you get back. The Ultra Plus takes up to 1,600W of panel and the Max takes 500W. In ideal sun, the Ultra Plus refills a battery half again as big in about half the time.
The rest of the Ultra Plus is the Max scaled up by about half. The battery, the inverter (the part that sets how much you can run at once) and the surge rating all grow by that much. The price grows by more: $700 on top of the Max's $899.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
Capacity
What the extra buys on top of size is the 1,600W solar port, a faster USB-C port and the option of expansion batteries.
DELTA 3 Ultra Plus capacity is 3,072Wh against the Max's 2,048WhDELTA 3 Ultra Plus price is $1,599 against the Max's $899The Ultra Plus's best USB-C port gives 140W to the Max's 100W
Why it mattersPrice the Ultra Plus on whether you'd use those extras.
solar input
A single folding panel gives both units the same trickle, and the Ultra Plus's bigger port mostly sits idle. The gap opens once there's a real array on a roof or a rack.
DELTA 3 Ultra Plus: 3,072Wh capacity, 1,600W solar ceilingDELTA 3 Max: 2,048Wh capacity, 500W solar ceiling
Why it mattersIf serious solar is in your plans, the port is worth paying for. If you own one folding panel, it isn't yet.
The specific dimensions that decide these two units β everything else is a tie.
Your Life, Your Pick
Selected because: The Ultra Plus wins four of six outright.
Four of the six scenarios go to the Ultra Plus. Weekend Camping is the clearest. It needs 2,100Wh, and after the allowance we take off every battery for conversion losses, the Max comes up 359Wh short. The Ultra Plus finishes with 511Wh to spare.
The blackout, the remote workday and the tailgate also go to the Ultra Plus, but the Max finishes all three. A CPAP night is a tie, since both cover it several times over. Van Life Daily beats them both.
Growth Path
Selected because: Solar refill and expansion batteries are what a multi-day outage runs on.
solar input
The Ultra Plus takes EcoFlow's expansion batteries, so it can grow past what it ships with. The DELTA 3 Max isn't expandable, so 2,048Wh is where it stays. The bigger solar port then fills the bigger bank.
If I were building a few days of outage cover, this is the line I'd pay for. With a real array on the roof, the Ultra Plus can win back what the night took.
Lifetime Value
Selected because: Both ownership-cost measures favor the Max.
cost / lifetime kWh
This is where the Max wins. Both carry 4,000 rated cycles and a 5-year warranty, so the price gap runs straight through the math. The Max works out at $0.11 per lifetime kWh and the Ultra Plus at $0.13. A lifetime kWh is the energy a battery should deliver across all of its rated cycles.
Portability & Form Factor
Selected because: At 74.3 lbs, the Ultra Plus changes who can move it.
weight
The Ultra Plus weighs 74.3 lbs, and one reviewer called that weight thunderousB9. The Max is the lighter of the two and still a two-hand lift.
How much that costs you depends on how often it moves. A unit that lives in the garage next to the transfer switch pays its weight once. One that goes in and out of a truck every weekend pays it every trip. Our spec record doesn't track wheels, so look at the photos before you plan on lifting it alone.
Strengths & trade-offs
EcoFlow DELTA 3 Max
Strengths
- +Costs $700 less
- +Lighter by 29.5 lb
Trade-offs
- βWeaker inverter (-1,200W) limits appliance compatibility.
- βSealed capacity β the DELTA 3 Ultra Plus can add batteries to grow past 2,048Wh; this one can't.
EcoFlow DELTA 3 Ultra Plus
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- βSubstantially more expensive (+$700) than the DELTA 3 Max.
- βSignificantly heavier (+29.5 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 Β· 2 nights Β· needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
DELTA 3 Ultra Plus
The DELTA 3 Max doesn't finish β 1,741Wh usable against the 2,100Wh this needs leaves it 359Wh short, about 83% of the scenario covered. The DELTA 3 Ultra Plus covers it with 511Wh to spare.
Battery budget usedlower = more headroom
LOADΒ Β Phone Charger 15WΓ6h Β· LED Lights 40WΓ8h Β· Box Fan 75WΓ14h Β· CPAP Machine 40WΓ16h
SCN-02 Β· 8 hours Β· needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
DELTA 3 Ultra Plus
Both survive the night. The DELTA 3 Ultra Plus finishes at 63% used with 966Wh left β 59% of a second night. The DELTA 3 Max finishes at 94% with 96Wh, 6% of a second night. If your outages tend to run past one evening, that difference is the whole argument between them.
Battery budget usedlower = more headroom
LOADΒ Β Fridge 150WΓ8h Β· Router + Modem 20WΓ8h Β· LED Lights (4 bulbs) 40WΓ6h Β· Phone Charger 15WΓ3h
SCN-03 Β· 8 hours Β· needs 320Wh
CPAP Overnight
Sleep therapy without interruption β the #1 medical use case
Either unit
A CPAP is about 40W for eight hours, so both of these cover the night several times over β capacity isn't the question here. Both happen to list 30dB β the same published figure twice, not a measured tie β so there is nothing in the noise column to separate them either. Buy whichever is cheaper or easier to carry.
Battery budget usedlower = more headroom
LOADΒ Β CPAP Machine 40WΓ8h
SCN-04 Β· 8 hours Β· needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
DELTA 3 Ultra Plus
The DELTA 3 Ultra Plus clears the workday at 35% used, banking 1,701Wh β late work, extra calls, or a second laptop charge without arithmetic. The DELTA 3 Max at 52% also finishes, with 831Wh of slack for the unplanned.
Battery budget usedlower = more headroom
LOADΒ Β Laptop 60WΓ8h Β· External Monitor 30WΓ8h Β· Router + Modem 20WΓ8h Β· Phone Charger 15WΓ2h
SCN-05 Β· 4 hours Β· needs 670Wh
Tailgate Party
Game day power for the crew
DELTA 3 Ultra Plus
Both handle game day, and the Ultra Plus keeps more in reserve, 26% used against 38%. It's a light load, so what you'd feel is the walk from the trunk. The Max is the lighter of the two.
Battery budget usedlower = more headroom
LOADΒ Β Blender 400WΓ0.5h Β· LED TV (55") 80WΓ4h Β· Bluetooth Speaker 15WΓ4h Β· Phone Charger (Γ3) 45WΓ2h
SCN-06 Β· 24 hours Β· needs 4,685Wh
Van Life Daily
A full day of mobile living β the ultimate endurance test
Neither unit
Neither unit covers this scenario's 4,685Wh: the DELTA 3 Max comes up 2,944Wh short (about 37% covered), the DELTA 3 Ultra Plus 2,074Wh (56%). Treat this as partial cover β enough for the essentials in it, not the whole list.
Battery budget usedlower = more headroom
LOADΒ Β Mini-Fridge 150WΓ24h Β· Laptop 60WΓ4h Β· Phone Charger 15WΓ3h Β· LED Lights 40WΓ5h Β· Fan 75WΓ8h
The Load Test
RUNTIME = (Wh Γ 0.85) Γ· 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 3 Ultra Plus runs 12.7h vs 8.5h.
$1,599 list Β· direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sizedΒ β
Modeled from the spec record β same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.ΒΉ
Essentials
The basics you need runningscale 0β174.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β34.8hHigh-Draw Appliances
These reveal the real limitsscale 0β2.6hΒΉ Runtime = (capacity Γ 0.85) Γ· 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 β see methodology.
Conclusion
November 1, 2026
Verdict: the DELTA 3 Ultra Plus, on Power Score margin
Take the DELTA 3 Ultra Plus if your loads regularly run past what 2,048Wh can carry. It wins four of the six modeled scenarios outright, including Weekend Camping, where the Max comes up short. Its 1,600W solar input, against the Max's 500W, refills its bigger battery in about half the time, and that matters most once a blackout runs into a second night. The price grows faster than the hardware. The Max stays cheaper to own, at $0.11 per lifetime kWh against $0.13, and it's the easier one to move. If your draw fits inside the Max, stay there.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of November 1, 2026. The links below open EcoFlow's current price.
$1,599.00 Β· direct from EcoFlow
Last checked 28 days ago. Prices move β check before you buy.
or check the DELTA 3 Max price$899.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester Β· Station Arena Test Desk Β· Updated November 1, 2026
Black Friday Β· 26 days out
Prices to beat:DELTA 3 Max $799DELTA 3 Ultra Plus $1,499
The lowest we have recorded for each. A Black Friday price above it is a sale that unit has already had.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): CPAP, Apartment Balcony, Camping.
Full specifications
α΅ Derived: price Γ· rated capacity. See the data behind our comparisons β
Comparison ToolAdd more power stations, side by sideOpen Tool βHow these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it β no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews β see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity Γ 0.85 inverter efficiency) Γ· 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 βClass ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews β 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 5β . Here, DELTA 3 Max rates 4.1/5 (48th percentile of 28 Large-class units), and DELTA 3 Ultra Plus rates 4.9/5 (96th percentile of 28 Large-class units).
How the class ranking is computed βTest Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
DELTA 3 Ultra Plus: 74.3 lbs Is a Commitment
At 74.3 lbs, this is manageable but not fun to move. That's heavier than a large checked suitcase. How much it costs you depends on whether it rolls β wheels and a telescoping handle change the job completely at this weight, and our spec record doesn't track them, so look at the product photos before you plan on carrying it from the car.
DELTA 3 Max: Fixed Capacity
The DELTA 3 Max is sealed at 2,048Wh β fine if that covers you, but it's the ceiling. By contrast the DELTA 3 Ultra Plus can add expansion batteries, though the first thing it has over the DELTA 3 Max is its own 3,072Wh base β expansion is the step after that, for the buyer who would outgrow 3,072Wh as well.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the DELTA 3 Max works out at 5.6 years of cover per $1,000 spent against the DELTA 3 Ultra Plus's 3.1, but that spread is the price gap, not the terms.
Full record above β the Test Desk pick is the DELTA 3 Ultra Plus.
Check DELTA 3 Ultra Plus price βor check the DELTA 3 Max priceOwnership Analysis
What happens after you buy β 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
β warranty ends Β· Reaching the cycle rating means ~80% capacity remains β degraded, not dead.
Analyst note
Both units have similar long-term ownership costs ($0.11/kWh vs $0.13/kWh). The price difference is what you see on the sticker β neither is a hidden bargain or rip-off. One thing to know reading the table: both carry the same 4,000-cycle rating, so the lifetime rows are sticker price and capacity in disguise β the wear horizon is identical and decides nothing here.
Growth path
DELTA 3 Max
FIXED CAPACITYFixed at 2,048Wh β a sealed, complete system rather than a starting point. There's no expansion port, so that figure is the ceiling: check it against your longest unplugged stretch before you buy.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Adequate ports for most setups, but heavy users may want a power strip.
DELTA 3 Ultra Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 3,072Wh.
Accepts up to 1,600W 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.
Realistic full solar rechargeat 70% of rated panel output β see methodology
Analyst note
Only the Ultra Plus takes expansion batteries, and its 1,600W solar ceiling can feed a bigger bank. The DELTA 3 Max stays at 2,048Wh.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 3 Max
Reviewers describe the DELTA 3 Max as whisper-quiet under moderate loadA1. The EcoFlow app is a big part of why people move to the brandA2. It adds a custom charge-speed limit and a quiet mode that go well beyond the buttons on the unitA2.
In one hands-on review, capacity held steady from the first month to the third. The unit rode in a truck bed, sat in a hot garage and ran near freezing without troubleA3. The same review rated it one of the better values in its classA4.
βWhisper-quiet under moderate load β essentially silent at conversational distance; the app adds a low-power quiet mode and a custom charge-speed limit if fan noise bothers you. Fans rise under heavy load but stay quieter than most competitors in the 2kWh class.β
Sources
backuppowerhub.com Β· thesolarlab.com Β· androidguys.com
EcoFlow DELTA 3 Ultra Plus
Reviewers describe the Ultra Plus as quiet even when it's pushed hardB1B13, and one puts it closer to EcoFlow's big DELTA Pro Ultra than to older DELTAsB2. One reviewer worked a full eight-hour remote day on it, with a laptop, a desktop workstation and monitors, and still had plenty left at the endB5.
The build reads as solid, with nothing that feels cheapB8, and the app's Storm Guard tops the battery up when severe weather is on the wayB12. It's a recent release, and our research found no long-term owner reports yetB0.
βeven when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Maxβ
Sources
thesolarlab.com Β· postperspective.com Β· appleinsider.com Β· digitaltrends.com Β· storagereview.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
- Reviewers consistently praise practical quietness (with app-based quiet/charge-limit modes) and the EcoFlow app/ecosystem as differentiators. [DELTA 3 Max Β· 2 entries]
- Professional reviewers consistently describe the fan noise as very quiet even under heavy load, comparable to EcoFlow's premium DELTA Pro Ultra line. [DELTA 3 Ultra Plus Β· 3 entries]
- Reviewers report solid UPS/pass-through charging performance with no noticeable switchover issues or output throttling tied to input wattage. [DELTA 3 Ultra Plus Β· 2 entries]
- The unit's high weight (~74 lbs) and premium MSRP are repeatedly flagged as drawbacks, though discounted street pricing is seen as making the value proposition much stronger. [DELTA 3 Ultra Plus Β· 3 entries]
- Build quality/durability is praised as substantial and non-fragile across multiple independent reviews. [DELTA 3 Ultra Plus Β· 2 entries]
- A1
βWhisper-quiet under moderate load β essentially silent at conversational distance; the app adds a low-power quiet mode and a custom charge-speed limit if fan noise bothers you. Fans rise under heavy load but stay quieter than most competitors in the 2kWh class.β
backuppowerhub.com β EcoFlow DELTA 3 Max Review; thesolarlab.com β DELTA 3 Max Review Β· 2026 Β· [positive]
- A2
βThe EcoFlow app is one of the main reasons people migrate to the ecosystem: deep control including a custom charge-speed limit and quiet mode, well beyond the on-device interface.β
androidguys.com / thesolarlab.com β EcoFlow DELTA 3 Max line Β· 2026 Β· [positive]
- A3
βCapacity stayed consistent between 1-month and 3-month tests (within measurement error). The unit survived truck-bed transport, storage in a ~105Β°F garage, and operation near freezing (~34Β°F) without issue.β
backuppowerhub.com β EcoFlow DELTA 3 Max Review (hands-on) Β· 2026 Β· [positive]
- A4
βRated 8.5/10 overall β strong across nearly every metric in the 2kWh class, with fast recharge and LFP longevity called one of the best value propositions in the segment.β
backuppowerhub.com β EcoFlow DELTA 3 Max Review Β· 2026 Β· [positive]
- B1
βeven when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Maxβ
thesolarlab.com β EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? Β· unknown Β· [positive]
- B2
βwe'd probably say the noise it creates is similar to what you hear when you run the DELTA Pro Ultra, which is pretty amazingβ
thesolarlab.com β EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? Β· unknown Β· [positive]
- B5
βI was able to work remotely for an eight-hour day with 40% power left, which included running my laptop, desktop workstation and monitorsβ
postperspective.com β Review: EcoFlow Delta 3 Ultra Plus Portable Power Station Β· 2026-04 Β· [positive]
- B8
βIt does not feel cheap or fragile. Everything from the outer shell case to the plastic buttons and the AC cable feels substantial and durableβ
appleinsider.com β EcoFlow Delta 3 Ultra Plus review: Premium, but solid power Β· 2025-11 Β· [positive]
- B9
βWeighing in at a thunderous 74 pounds, the Ultra is not considered lightweight by any standardsβ
appleinsider.com β EcoFlow Delta 3 Ultra Plus review: Premium, but solid power Β· 2025-11 Β· [mixed]
- B12
βEcoFlow's companion app adds genuinely useful features like Storm Guard, which automatically charges the unit when severe weather is detectedβ
digitaltrends.com β EcoFlow DELTA 3 Ultra Plus Review: Portability meets serious firepower Β· unknown Β· [positive]
- B13
βEach unit operates quietly at under 25dB, remaining unobtrusive even during sustained loadsβ
storagereview.com β EcoFlow DELTA 3 Max Plus & Ultra Plus Review Β· 2025-09-30 Β· [positive]
Research compiled November 1, 2026.
Who Should Buy Which
Buy the DELTA 3 Max if youβ¦
- βYour loads fit inside 2,048Wh. The Max does those jobs for $700 less and costs less to own.
- βYou move the unit often. It's the lighter of two heavy boxes.
- βYou charge from the wall or one modest panel, where the Ultra Plus's bigger solar port would sit idle.
Buy the DELTA 3 Ultra Plus if youβ¦
- βYour outages run past one night. The Ultra Plus finishes an 8-hour blackout with more than half a second night left.
- βYou have, or plan, enough solar to use a 1,600W port.
- βYou want room to add expansion batteries. Only the Ultra Plus takes them.
If neither fits
If your day looks like Van Life Daily's 4,685Wh, neither unit covers it. The Ultra Plus gets a little over halfway and the Max a bit over a third. That's a job for a bigger system.
The Bottom Line
The Ultra Plus is a bigger Max with a solar port more than three times larger, and it costs more than the size alone explains.
Buy the Ultra Plus if your outages run past one night and you have the solar to refill it. For anything that fits inside 2,048Wh, the Max does the job for $700 less and is the easier lift.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA 3 Ultra Plus worth $700 more than the DELTA 3 Max?
Yes, if your loads regularly exceed 2,048Wh or you will charge from more than 500W of solar. It wins four of six modeled scenarios outright, including Weekend Camping, where the Max falls short. If not, the Max is cheaper to own: $0.11 per lifetime kWh against $0.13, and less per year of warranty.
Does the Ultra Plus's extra capacity mean a longer solar refill?
No. The Ultra Plus accepts up to 1,600W of solar and the Max 500W. In ideal sun, the Ultra Plus fills its 3,072Wh battery in about half the time the Max needs to fill its 2,048Wh.
Which one is easier to move around?
The DELTA 3 Max, the lighter of the two. The Ultra Plus weighs 74.3 lbs, and one reviewer called that weight thunderous.
Which one is cheaper to own?
The Max, on both measures. It costs $0.11 per lifetime kWh against the Ultra Plus's $0.13, and less per year of warranty. Both carry 4,000 rated cycles and a 5-year warranty.
Is the DELTA 3 Ultra Plus new? Is there long-term owner data on it?
It's a recent release, and our research found little long-term owner data yet. Most of the evidence comes from professional reviews rather than months of field use.
Related comparisons
Related buying guides
Where to buy
EcoFlow DELTA 3 Max
$899.00
$899.00 Β· direct from EcoFlow
Last checked 28 days ago. Prices move β check before you buy.
EcoFlow DELTA 3 Ultra PlusPick
$1,599.00
$1,599.00 Β· direct from EcoFlow
Last checked 28 days ago. Prices move β check before you buy.
Prices may vary by retailer and are subject to change.