Head-to-head test
EcoFlow DELTA 3 Ultra vs BLUETTI Apex 300 + B300K
Whether the battery ever leaves the house: the DELTA 3 Ultra is a 72.1 lb box that travels with its own USB and 12V ports, and the Apex 300 + B300K is a 148.8 lb stack that earns its extra cost only when it's parked in one spot through outages longer than a night.
Full profiles: EcoFlow DELTA 3 Ultra β Β· BLUETTI Apex 300 + B300K β
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Buy the DELTA 3 Ultra unless this battery is going to live in one spot and carry a home through outages longer than a night. Per watt-hour the two are priced within a cent of each other, $0.46 against $0.47, so the $1,200 between them buys 2,457.6Wh more at the going rate rather than at a premium. The Apex 300 + B300K isn't overpriced. It's built for a different job.
That job is a long outage or a life off the grid, and the Apex is very good at it. It takes 2,400W of solar to the Ultra's 800W, has a 240V outlet the Ultra lacks, accepts more BLUETTI batteries, and is rated for 6,000 cycles against 4,000, which makes it the cheaper energy over its rated life. If your battery's permanent address is a utility room, those are real reasons to spend the difference.
The Ultra's case is that it goes places and arrives complete. It's one 72.1 lb box with 140W USB-C, two USB-A ports and a 12V car socket on its face. The Apex is a 148.8 lb stack, and every USB and DC output on it requires the separately sold Hub D1B1B2. The Ultra finishes five of the six days modeled here. The one it can't is a 4,685Wh van-life day, and nothing you buy later fixes that, because it's sealed.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
A lifetime figure is only collected by someone who uses the lifetime. Cycle both daily and the Ultra's rating runs out in year 11 while the Apex keeps going to 16.4. Use them on weekends and the ratings stretch to 38.5 and 57.7 years, both far past the point anyone keeps a power station, and spread over those years the Ultra costs $0.10 a day to the Apex's $0.12. A home-backup unit that sees a handful of outages a year never gets near either number.
Apex 300 + B300K: 6,000 cycles x 5,529.6Wh = 33,178 kWh of rated life, $0.08 per lifetime kWhDELTA 3 Ultra: 4,000 cycles x 3,072Wh = 12,288 kWh of rated life, $0.11 per lifetime kWhRated life at daily use: 16.4 years vs 11; at weekend use: 57.7 years vs 38.5, which spreads to $0.12 a day vs $0.10
Why it mattersCount the Apex's lifetime edge only if you'll drain it most days, off solar in a cabin or a van; otherwise it's a saving you never collect.
solar input
Refilling is where the gap compounds. At full rated input, replacing one 1,645Wh night takes the Ultra about 2 hours of strong sun (1,645Wh / 800W) and the Apex well under one (1,645Wh / 2,400W), provided you own enough panel to feed it. Grey days shrink both, and the Apex has three times the ceiling to catch whatever sun turns up. Add the 240V outlet and the reviewer who ran a washing machine and then a heat-pump dryer off the ApexB9B10, and it's the one of the two that behaves like a backup system rather than a big batteryB4.
8-Hour Blackout (1,645Wh): the Apex finishes with 3,055Wh left, 1.9 more nights; the Ultra with 966Wh left, 59% of a second nightSolar input: 2,400W on the Apex vs 800W on the Ultra240V outlets: 1 on the Apex, 0 on the Ultra
Why it mattersIf your outages are measured in days and the unit has a fixed home, buy the Apex.
weight
Away from a wall, those two choices decide everything. At a campsite or a tailgate the Ultra is complete out of the box, while the Apex can't charge a phone from a USB port without a second purchase, and reviewers who moved the stack put it near 150 lb and too heavy for most people to carry aloneB5B14. In a utility room none of that costs anything: chargers plug into AC, and the weight is paid once, on installation day.
DELTA 3 Ultra: 140W USB-C, 2 USB-A and a 12V car socket on the unit, 72.1 lbApex 300: every USB and 12V/DC output requires the separately sold Hub D1B1B2Apex 300 + B300K: 148.8 lb across two boxes, classed stationary in our record
Why it mattersIf the battery will ever ride in a vehicle, take the Ultra; if it's going in a basement to stay, the missing ports and the weight stop mattering.
The specific dimensions that decide these two units β everything else is a tie.
Portability & Form Factor
Selected because: At 72.1 lb the Ultra is one box you can load into a car; the Apex stack is 148.8 lb and built to stay where you put it, which settles this pair before capacity does.
weight
Seventy-two pounds is a bent-knees, two-hands lift into a hatchback: unpleasant, repeatable, and something one person can do on a Friday afternoon. The Apex stack is a different category of object. Reviewers who've moved it describe close to 150 lb of LFP that shifts with handles or a trolley but isn't something you casually take to a picnicB5, and one judged the Apex alone too big and heavy for most people to carry by themselvesB14. Our record classes it as stationary, and that's the honest reading. You place it once.
The ports tell the same story. The Ultra carries 140W USB-C, two USB-A and a 12V car socket on its own face, while every USB and DC output on the Apex requires the separately sold Hub D1 and the base unit is its six AC outlets plus high-voltage connectorsB1B2. In a utility room that costs nothing, since phone and laptop bricks plug into AC. At a campsite it means the bigger battery can't charge a phone over USB until you've bought something else.
Your Life, Your Pick
Selected because: The Ultra finishes five of the six modeled days and wins the three that travel; the Apex wins the three that reward reserve, including the van-life day the Ultra can't finish.
Three apiece, split along a clean line. The Ultra takes Weekend Camping, Tailgate Party and CPAP Overnight, the three that ask a battery to travel or sit beside a bed. The Apex takes the 8-Hour Blackout, Remote Workday and Van Life Daily, the three that reward reserve. On two of those the Ultra finishes anyway, at 63% used on the blackout and 35% on the workday. Winning on reserve and being the only unit that can do the job are different things.
Van Life Daily is the one row where capability rather than comfort decides. At 4,685Wh the Ultra comes up 2,074Wh short, about 56% of the day covered, and a sealed box has no way to close that. The Apex finishes with 15Wh left, which is a pass the way a coin balanced on its edge is standing up. Anyone buying the Apex for daily off-grid living should put a second B300K in the plan from day one, and the Hub D1 too if anything in the van runs on 12V or USB.
Lifetime Value
Selected because: The Apex is the cheaper energy over its rated life, $0.08 a lifetime kWh against $0.11, but only a buyer who cycles it daily ever collects that.
cost / lifetime kWh
Our pick loses this section, and it isn't close. Six thousand cycles across a pack that size gives the Apex nearly three times the Ultra's rated lifetime energy, which is why the more expensive box is the cheaper one per kilowatt-hour delivered.
The catch is the word lifetime. The Apex's advantage only starts paying once you've outlived the Ultra's rating, and at daily use that's year 11. At weekend duty the Ultra's rating stretches to 38.5 years, longer than anyone keeps a power station, and spread across that life it costs $0.10 a day to the Apex's $0.12. Cheaper energy is only cheaper if you actually draw it.
Growth Path
Selected because: The Ultra is sealed at 3,072Wh; the Apex starts at 5,529.6Wh and takes more BLUETTI batteries, which matters to anyone whose loads are still climbing.
solar input
A sealed box isn't a flaw when it covers you, and 3,072Wh covers five of the six days here. It counts against the Ultra in this pair because the rival's ceiling is genuinely higher: the Apex starts 2,457.6Wh above it and takes more BLUETTI batteries on top, each B300K adding about 2.7kWh by one tester's accountB13. Another reviewer tried a workaround to stretch the Apex's runtime and concluded that a proper B300K was the neat answerB11.
The Ultra's only upgrade is a second power station, with its own panels and its own outlets. If your loads are climbing toward partial-home backup, that's the strongest reason on this page to spend the extra. If they aren't, you'd be paying for rooms you never move into.
Strengths & trade-offs
EcoFlow DELTA 3 Ultra
Strengths
- +Costs $1,200 less
- +Lighter by 76.7 lb
Trade-offs
- βSealed capacity β the Apex 300 + B300K can add batteries to grow past 3,072Wh; this one can't.
- βShorter-lived battery β rated for 4,000 charge cycles vs the Apex 300 + B300K's 6,000, so it wears out sooner.
BLUETTI Apex 300 + B300K
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 6,000 charge cycles β much longer battery lifespan
Trade-offs
- βSubstantially more expensive (+$1,200) than the DELTA 3 Ultra.
- βSignificantly heavier (+76.7 lbs), making it harder to move.
- βVery heavy unit that may be difficult for one person to lift.
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
The Ultra finishes a 2,100Wh weekend at 80% used with 511Wh to spare, and it's the only one of the two that realistically gets to the campsite. The Apex would come home with more than half its charge, but a 148.8 lb stationary stack is a moving job, not camping gear.
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
Apex 300 + B300K
Both get through the night. The Apex ends it at 35% used with enough left for 1.9 more nights like it; the Ultra ends at 63% with 59% of a second night in hand. For a single evening that's a tie in practice. For an outage that runs into day two, it's the whole argument.
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 night uses 12% of the Ultra and 7% of the Apex, so capacity settles nothing. The Ultra takes it as the one you'd actually put beside a bed: a single 72.1 lb box with the lower published noise rating, against a stationary stack. The two ratings come from different makers measuring differently, so look for hands-on reports before trusting either one near your pillow.
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
Apex 300 + B300K
Both finish the 910Wh workday easily: the Apex at 19% used, the Ultra at 35% with 1,701Wh still in hand. The Apex wins on reserve. Worth knowing before you plug in: its USB-C ports require the separately sold Hub D1, so out of the box the laptop runs off its AC brick, while the Ultra has 140W USB-C on its face.
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
A 670Wh tailgate uses 26% of the Ultra, and the Ultra is the one that fits in the trunk. The Apex holds about seven times this load (4,700Wh usable / 670Wh) and still loses, because none of that capacity helps it into a truck bed.
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
Apex 300 + B300K
Only the Apex finishes the 4,685Wh day, and only just, with 15Wh left. The Ultra comes up 2,074Wh short, about 56% of the day covered, and being sealed it has no way to close the gap. Buy the Apex for this life with a second B300K in the plan, plus the Hub D1 for anything that runs on 12V or USB.
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: Apex 300 + B300K runs 22.9h vs 12.7h.
$2,599 list Β· direct from BLUETTI
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 0β313.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β62.7hHigh-Draw Appliances
These reveal the real limitsscale 0β4.7hΒΉ 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
October 11, 2026
Verdict: the EcoFlow DELTA 3 Ultra
Buy the DELTA 3 Ultra unless the battery will live in one place and carry a home through outages longer than a night, or you'll drain it every day. The Apex 300 + B300K isn't overpriced: per watt-hour the two sit within a cent of each other, and the Apex brings 5,529.6Wh, 2,400W of solar input to the Ultra's 800W, a 240V outlet, expansion batteries and 6,000 rated cycles, enough to make it the cheaper energy over its rated life. But it's a 148.8 lb stationary stack, and every USB and DC output on it needs the separately sold Hub D1B1B2. The Ultra is one 72.1 lb box with 140W USB-C and a 12V socket built in, and it finishes five of the six days modeled here; the one it can't is a 4,685Wh van-life day. Confidence is 6 rather than higher because for a fixed home-backup install, the Apex is the better buy outright.
Today the DELTA 3 Ultra is $1,299, $100 under its typical $1,399. The verdict weighs typical prices, not today's. Prices checked 28 days ago.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of October 11, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$1,299.00 Β· direct from EcoFlow
down from $1,399 Β· 7% below usual
Last checked 28 days ago. Prices move β check before you buy.
or check the Apex 300 + B300K price$2,599.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester Β· Station Arena Test Desk Β· Updated October 11, 2026
Black Friday Β· 26 days out
Prices to beat:DELTA 3 Ultra $1,199Apex 300 + B300K $2,364
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): UPS, RV Living, Tailgating.
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 Ultra rates 4.7/5 (85th percentile of 28 Large-class units), and Apex 300 + B300K rates 4.2/5 (53rd percentile of 20 Home Backup-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.
72.1 lb You Lift, 148.8 lb You Place
Neither is grab-and-go. The Ultra is one box: a bent-knees, two-hands lift into a car that one person can repeat next weekend. The Apex 300 + B300K is 148.8 lb split across two stacked boxes, so it moves in pieces and it's built to be placed once. That's a 76.7 lb difference, and on the Apex you pay it on installation day rather than every trip.
Two Noise Ratings, Two Rulebooks
The Apex is rated 45dB and the Ultra 30dB, each by its own maker under its own conditions, so the two figures aren't a like-for-like comparison and neither describes a light overnight load. In a utility room it won't matter either way. If the unit is going in a bedroom or a small van, look for hands-on reports before trusting either number.
The DELTA 3 Ultra Is Sealed at 3,072Wh
That's fine while it covers you, and it covers five of the six days modeled here. But there's no expansion port, so the only upgrade is a second power station. The Apex starts at 5,529.6Wh and takes more BLUETTI batteries on top. If your loads are already climbing, this is the honest case against our pick.
Apex 300 + B300K: Power Lifting to 7,680W
The Apex 300 + B300K has BLUETTI's Power Lifting mode, which runs a resistive appliance rated up to 7,680W from its 3,840W inverter. It does that by delivering less power than the appliance asks for, not more than the inverter has: the heater still works, it just heats more slowly. Two things follow. BLUETTI scopes the mode to purely resistive loads β a heater, a kettle, an incandescent lamp β so it does nothing for a fridge compressor, a pump or a power tool, and this record publishes no surge figure at all, so read the mode as a resistive-load feature rather than as starting ability. And it is not a reason to size down, because running a load that big from 5,530Wh is a short session either way. Genuinely useful if a heater or a kettle is why you're buying; beside the point otherwise. The DELTA 3 Ultra publishes no equivalent.
Five Years Each, With One Condition
Both carry 5 years, so the term doesn't break the tie. EcoFlow's 5 years is stated plainly. BLUETTI's is up to 5 years with registration or a direct purchase, since reseller purchases carry a shorter term, so buy the Apex direct if you buy it. Worth knowing on the other side: EcoFlow offers no parts or service once its warranty ends.
Battery Lifespan in Real Years
The Apex 300 + B300K is rated for 6,000 cycles vs 4,000. In real life: at daily use, that's 16.4 vs 11 years. At weekend use (twice a week), it's 58 vs 38 years. One caution reading years across different sizes: a cycle is 5,530Wh on the Apex 300 + B300K and 3,072Wh on the DELTA 3 Ultra, so count lifetime energy β roughly 33,178 kWh against 12,288 kWh over the rated life. After hitting the cycle limit, the battery doesn't die β it drops to ~80% of original capacity, which is still very usable.
Full record above β the Test Desk pick is the DELTA 3 Ultra.
Check DELTA 3 Ultra price βor check the Apex 300 + B300K 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
The DELTA 3 Ultra is cheaper to buy, but the Apex 300 + B300K is cheaper to own. At $0.08/kWh over its lifetime vs $0.11/kWh, the Apex 300 + B300K's higher cycle life and capacity make each dollar go further over the years.
Brand trust
EcoFlow
Ecosystem
Largest in portable power β 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 β 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 β Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) Β· 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 β flagship paths, not line-wide features.
Worth knowing
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
BLUETTI
Ecosystem
One of the broadest lineups β 15-20+ models from budget (AC2A) to flagship portable (Apex 300, 2764.8Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The most inconsistent support in the space. Heavily email-based with China timezone delays. Some users get smooth, efficient service; others report weeks of troubleshooting runarounds, being offered discounts on new units instead of repairs, and confusing third-party purchase claim processes. Buying direct from Bluetti's website tends to produce better support outcomes.
Community
Active and growing β Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android β tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
Among the best capacity-to-price ratios available β several Elite and Apex units are the lowest $/Wh in the catalog. Widest product diversity including industry-firsts like sodium-ion cold-weather units and dual solar+alternator vehicle hubs. LFP across the rest of the range, though rated cycle life spans 2,500 (EB3A) to 6,000, and it varies WITHIN the Elite range rather than tracking it β the Elite 300 and Elite 200 V2 are rated 6,000 while the Elite 30 V2, Elite 10 Mini, Elite 320 and Elite 400 are rated 3,000+ and the Elite 100 V2 4,000+, so check the specific model. Dual-voltage (120V/240V) in flagships.
Worth knowing
Customer support inconsistency is the #1 risk factor. Older/discontinued units may become unrepairable β no spare parts policy for some models. Some reports of erratic communication from support agents.
Analyst note
On a system that may become your home's backup, support is part of the product. EcoFlow's is inconsistent but has a US phone line behind it. BLUETTI's is mostly email on China time and the least consistent in the category, and buying direct from BLUETTI's own site tends to produce better outcomes. If you buy the Apex, buy it direct, so a claim has the shortest path to a person.
Growth path
DELTA 3 Ultra
FIXED CAPACITYFixed at 3,072Wh 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 800W of solar. Suitable for a 1-2 panel setup.
Adequate ports for most setups, but heavy users may want a power strip.
Apex 300 + B300K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 5,530Wh.
Accepts up to 2,400W of solar. Enough for a serious multi-panel array.
Limited ports. You'll likely need a power strip or splitter.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Realistic full solar rechargeat 70% of rated panel output β see methodology
Analyst note
The DELTA 3 Ultra is sealed at 3,072Wh, which is fine if that covers you. The Apex 300 + B300K starts at 5,530Wh and can grow beyond it with BLUETTI expansion batteries β real headroom the DELTA 3 Ultra doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 3 Ultra
Field evidence for the base DELTA 3 Ultra is thin and mostly borrowed: our research found that 13 of 15 entries come from reviews of the Ultra Plus, a sibling with the same capacity, output and chassis but more solar input and an expansion portA0. Read what follows as reviewer character notes, not an owner track record. Reviewers describe the fans as much quieter than older EcoFlow units like the DELTA 2 Max, and never annoying even with the inverter pushed to its maximumA1A2. Testers who pulled the wall plug mid-session saw no dip and no shutdown, one comparing it to the APC gear they'd worked with for a careerA5A6, and it doesn't clamp its output to the input wattage while passing power throughA4.
The gripes are small. One tester couldn't read the display in direct sun without cupping a hand over itA11. Build quality draws repeated praise, from the shell and the AC cable to the rear port doors that slide out of the wayA9A15. One reviewer worked a full eight-hour day off it, laptop plus desktop workstation and monitors, and finished with 40% leftA8.
βEven when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max.β
Sources
thesolarlab.com Β· postperspective.com Β· appleinsider.com Β· digitaltrends.com Β· popsci.com
BLUETTI Apex 300 + B300K
The Apex 300 + B300K is new enough that its record is reviewer test units, not owners, and our research found no long-term reliability, fan-noise or idle-drain reports for this bundleB0. What reviewers agree on is heavy appliances. One ran a washing-machine cycle that took the Apex from 100% to 65%, then put a heat-pump dryer on it and watched it fall to 20%B9B10. Another called it one of the few systems they'd tested that could genuinely replace a generator, without the noise, fumes or maintenanceB4. A third had it recharged and ready again in under an hourB12.
The complaints cluster on what isn't there. The base unit has no USB or DC ports at all; they live on the separately sold Hub D1, which one reviewer called steep for what it addsB1B2, and another pointed out the bundle price doesn't include the hub or a trolleyB3. Weight is the other constant: near 150 lb stacked, movable with handles or a trolleyB5, with the Apex alone too heavy for most people to carry soloB14.
βThe Apex 300 doesn't have USB ports, DC ports, or much of anything beyond its six AC plugs and high-voltage connectors.β
Sources
thesolarlab.com Β· techspective.net Β· digitalreviews.net Β· thesolarpit.com Β· cleantechnica.com Β· trustedreviews.com Β· bluettipower.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 the quiet fan operation of the Ultra-tier unit compared to older EcoFlow models, though this is described in professional test conditions rather than long-term ownership. [DELTA 3 Ultra Β· 2 entries]
- UPS/switchover performance is repeatedly called seamless with no observed dips or shutdowns during power interruption tests. [DELTA 3 Ultra Β· 3 entries]
- The unit's substantial 74 lb weight is flagged across multiple reviews as a portability drawback, mitigated somewhat by wheels and handle design. [DELTA 3 Ultra Β· 2 entries]
- Build quality/durability (casing, cable, port covers) is repeatedly highlighted as premium and well-engineered. [DELTA 3 Ultra Β· 2 entries]
- Reviewers consistently flag that the base Apex 300 has no USB/DC ports and requires a separate paid Hub D1 accessory, which some feel is overpriced for what it offers. [Apex 300 + B300K Β· 3 entries]
- Multiple sources note the extreme weight/bulk of the stacked Apex 300 + B300K system, making 'portable' a stretch despite handles/trolley options. [Apex 300 + B300K Β· 2 entries]
- Reviewers praise fast recharge and the system's ability to genuinely replace a generator for home backup and heavy loads like washers/dryers. [Apex 300 + B300K Β· 4 entries]
- A1
βEven when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max.β
thesolarlab.com β EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? Β· 2025-09/10 (approx) Β· [positive]
- A2
βEven when you're pushing the inverter to its maximum output, the fans never become annoying or distracting.β
thesolarlab.com β EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? Β· 2025-09/10 (approx) Β· [positive]
- A4
βMany power stations limit you to the input wattage when outputting power, but this EcoFlow power station does not.β
thesolarlab.com β EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? Β· 2025-09/10 (approx) Β· [positive]
- A5
βOver my career I have become accustomed to APC batteries immediately switching on when there is a power hit or power shut-off, and the EcoFlow Delta 3 Ultra Plus works in the exact same way.β
postperspective.com β Review: EcoFlow Delta 3 Ultra Plus Portable Power Station Β· 2026-04 Β· [positive]
- A6
βI didn't experience any shut-offs or dips when I unplugged the EcoFlow from the wall.β
postperspective.com β Review: EcoFlow Delta 3 Ultra Plus Portable Power Station Β· 2026-04 Β· [positive]
- A8
βI was able to work remotely for an eight-hour day with 40% power left, which included running my laptop, desktop workstation and monitors.β
postperspective.com β Review: EcoFlow Delta 3 Ultra Plus Portable Power Station Β· 2026-04 Β· [positive]
- A9
βIt does not feel cheap or fragile. Everything from the outer shell case to the plastic buttons and the AC cable feels substantial and durable enough to withstand day-to-day wear and tear.β
appleinsider.com β EcoFlow Delta 3 Ultra Plus review: Premium, but solid power Β· 2025-11-16 Β· [positive]
- A11
βBut, while facing the sun, I had to employ the classic "cup hands cover" maneuver to get a clear look at the screen status.β
appleinsider.com β EcoFlow Delta 3 Ultra Plus review: Premium, but solid power Β· 2025-11-16 Β· [negative]
- A15
βI really love how the rear panel doors for the input ports slide into protective slots when in use.β
popsci.com β EcoFlow DELTA 3 portable power station series first impressions Β· 2025-09-29 Β· [positive]
- B1
βThe Apex 300 doesn't have USB ports, DC ports, or much of anything beyond its six AC plugs and high-voltage connectors.β
thesolarlab.com β Bluetti Apex 300 Review: Cheap, Practical Home Backup? Β· unknown (2025/2026) Β· [mixed]
- B2
βThat Bluetti D1 Power Hub that gives you your DC and USB ports costs about $300, which is a steep price for what you're getting.β
thesolarlab.com β Bluetti Apex 300 Review: Cheap, Practical Home Backup? Β· unknown (2025/2026) Β· [negative]
- B3
βThe bundle runs nearly $2,700, which puts it solidly in "serious investment" territoryβand that is not including the Hub D1 or foldable trolley if you want the full package.β
techspective.net β Bluetti Apex 300 with B300K Review Β· 2025-09-21 Β· [mixed]
- B4
βIt's one of the few systems I've tested that feels like it could genuinely replace a generator, without the noise, fumes, or maintenance.β
techspective.net β Bluetti Apex 300 with B300K Review Β· 2025-09-21 Β· [positive]
- B5
βStacked, you're near 150 pounds of lithium iron phosphate and inverter muscleβmovable with the built-in handles or a trolley... but not something you'll casually lug to a picnic.β
techspective.net β Bluetti Apex 300 with B300K Review Β· 2025-09-21 Β· [mixed]
- B9
βResults: 1 wash took about 1 hour and drained the Apex from 100% down to 65%.β
digitalreviews.net β Bluetti Apex 300 Power Station Tests (Australia) Part II Β· 2025-09 Β· [positive]
- B10
βJust for fun we then turned on our heat pump dryer to see that over 1Β½ hours it would further drain it down to 20%.β
digitalreviews.net β Bluetti Apex 300 Power Station Tests (Australia) Part II Β· 2025-09 Β· [mixed]
- B11
βYou can see, that whilst this works in a very roundabout way, it is not as neat and efficient as having a proper B300K battery to double the capacity.β
digitalreviews.net β Bluetti Apex 300 Power Station Tests (Australia) Part II Β· 2025-09 Β· [mixed]
- B12
βDuring my testing, the recharge speed was astonishing. In under an hour, I had a system ready to go again.β
thesolarpit.com β Bluetti Apex 300 Review Β· 2025-10-28 Β· [positive]
- B13
βFor van lifers, the Apex 300 is a great base station, and the ability to add another 2.7kWh of capacity by simply purchasing another B300K expansion pack is a game-changer.β
cleantechnica.com β The Bluetti Apex 300 & B300K Portable Power Station Tested Β· 2025-08-05 Β· [positive]
- B14
βAs will you: it weighs in at 38kg, and is probably much too big and heavy for most people to carry alone.β
trustedreviews.com β Bluetti Apex 300 Review Β· 2025-10-10 Β· [negative]
Research compiled October 11, 2026.
Who Should Buy Which
Buy the DELTA 3 Ultra if youβ¦
- βThe battery has to do the blackout and the camping trip. It finishes an 8-hour outage at 63% used and a 2,100Wh weekend at 80%, and at 72.1 lb one person can still get it into a car.
- βIt's going beside a bed. A CPAP night uses 12% of it, Ultra Plus reviewers describe its fans as quiet even at full outputA1A2, and the Apex stack isn't going up anyone's stairs.
- βYou want to plug a phone or laptop straight into the box. The 140W USB-C and the 12V socket are on the unit, where the Apex needs the Hub D1 for bothB1B2.
- βYour outages last hours, not days, and the wall outlet is your charger.
Buy the Apex 300 + B300K if youβ¦
- βThe unit has one home, a garage, basement or utility room, and your outages run past a night. It ends an 8-hour blackout with 1.9 more nights banked.
- βYou'll drain it daily off solar. That's when 2,400W of input earns its keep and the cheaper lifetime energy actually gets collected.
- βYou need a 240V outlet on the battery, which only the Apex has.
- βYou live in a van on purpose and will add a second B300K. It's the only one of the two that finishes the 4,685Wh day, and it does so with nothing to spare.
If neither fits
Close this tab if you pictured carrying it to a campsite with one hand. Both of these are heavy, and a smaller portable covers a weekend at a fraction of the weight and the money. Close it too if what you want is the whole house on a transfer switch for days at a stretch: that's a permanently installed home battery or a standby generator, and stretching a portable to cover it costs more and does less.
The Bottom Line
Buy the DELTA 3 Ultra. It finishes five of the six days modeled here, carries its own USB and 12V ports, rides in a car, and costs $1,200 less for capacity priced at the same rate per watt-hour. The Apex 300 + B300K is the bigger, longer-lived system, and the right one for two buyers: the one whose battery lives in a utility room and has to cover outages measured in days, and the one who drains it every day off solar.
If that's you, the Apex is the better buy and its cheaper lifetime energy is real. If it isn't, you'd be paying to bank energy you never draw. Take the Ultra and let it go camping.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the BLUETTI Apex 300 + B300K worth the extra money over the EcoFlow DELTA 3 Ultra?
Only if it stays in one place and your outages run past a night, or you'll drain it daily. Per watt-hour the two are priced within a cent ($0.46 against $0.47), so the $1,200 buys capacity at the going rate: 2,457.6Wh more, three times the solar input, a 240V outlet and an expansion path. If the battery has to travel or your worst day fits inside 3,072Wh, keep the difference.
Does the BLUETTI Apex 300 have USB ports?
Not on the unit. Every USB-C, USB-A and 12V/DC output on the Apex 300 requires the separately sold Hub D1, and the base unit offers its six AC outlets and high-voltage connectors. The USB figures in the spec table describe that hub, not the box. The DELTA 3 Ultra has 140W USB-C, two USB-A and a 12V car socket built in.
Will the EcoFlow DELTA 3 Ultra get through an 8-hour blackout?
Yes. The modeled outage draws 1,645Wh and the Ultra finishes at 63% used with 966Wh left, 59% of a second night. Switchover is rated no worse than 10ms, and Ultra Plus reviewers who pulled the plug mid-session saw no dip. Past one night, the Apex's extra reserve and its 2,400W solar ceiling start to matter.
Which is better for van life, the DELTA 3 Ultra or the Apex 300 + B300K?
The Apex 300 + B300K, because it's the only one that finishes: the modeled 4,685Wh day leaves the Ultra 2,074Wh short. But the Apex finishes with just 15Wh left, its 12V and USB outputs require the Hub D1, and at 148.8 lb it's an installation, not luggage. Plan on a second B300K if your days run heavy.
Which one is quieter to sleep next to?
The DELTA 3 Ultra is the better bedroom unit, but not because the noise ratings prove it. Each maker publishes its own figure measured its own way, so the two aren't a like-for-like comparison. Ultra Plus reviewers describe its fans as quiet even at maximum output, and our research found no fan-noise reports on the Apex either way. A CPAP night uses 12% of the Ultra, so capacity gives no reason to bring the bigger stack into a bedroom.
Where to buy
EcoFlow DELTA 3 UltraPick
$1,299.00
$1,299.00 Β· direct from EcoFlow
down from $1,399 Β· 7% below usual
Last checked 28 days ago. Prices move β check before you buy.
BLUETTI Apex 300 + B300K
$2,599.00
$2,599.00 Β· direct from BLUETTI
Last checked 28 days ago. Prices move β check before you buy.
Prices may vary by retailer and are subject to change.