Head-to-head test
EcoFlow DELTA Pro Ultra X vs BLUETTI Apex 300
These cost the same per kilowatt-hour of life to within a penny, so value can't decide this one; the only question that can is whether 3,840W of continuous output is enough house, because no expansion battery ever raises it.
Full profiles: EcoFlow DELTA Pro Ultra X → · BLUETTI Apex 300 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$7,999.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
$1,499.00 · direct from BLUETTI
down from $1,699 · 12% below usual
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
Ten cents against nineteen. Over its 6,000 rated cycles the $1,699 Apex 300 delivers a kilowatt-hour for about half what the $7,999 DELTA Pro Ultra X does over its 3,500. The $6,300 between them is quantity, but no longer quantity at the same rate.
Which kills the usual comparison. Neither unit is overpriced against the other, so price can't settle this, and the spec that can is the one number expansion never touches: 3,840W continuous on the Apex against 12,000W on the DELTA. Bolt batteries onto the Apex all afternoon and it still holds 3,840W.
Our answer is the Apex 300, with a condition attached. It clears five of the six load scenarios here, and one of those five, a 2,100Wh camping weekend, it clears by 250Wh. That's not a margin, it's a rounding error, and you should know it before you spend anything. But if your load list has something on it above 3,840W, this stops being close and the DELTA is the only one of the two still in the conversation.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Two Apexes and the box that joins them is $1,699 twice plus about $699, so $4,097 for 5,529.6Wh. That's 74 cents a watt-hour, above the DELTA's 65, and it still tops out at 7,680W continuous against 12,000W. You pay a premium to arrive somewhere smaller.
Apex 300: $1,699 for 2,764.8Wh, which is 61 cents a watt-hourDELTA Pro Ultra X: $7,999 for 12,288Wh, which is 65 cents a watt-hourApex 300 continuous output is 3,840W; linking two of them requires BLUETTI's Hub A1 parallel box at around $699B12
Why it mattersIf your plan is to start with one Apex and add another later, price the finished plan today rather than the first step, because the ladder costs more than the elevator.
rated cycles
So the sticker gap can't be read as a quality gap, which strips the decision down to one spec neither the price nor the warranty column reflects: 3,840W against 12,000W continuous. That number is fixed at purchase for both units, and it's the only thing here you genuinely cannot buy your way out of later.
DELTA Pro Ultra X: 12,288Wh across 3,500 cycles is 43,008 kWh over its life, at $7,999Apex 300: 2,764.8Wh across 6,000 cycles is 16,589 kWh over its life, at $1,699Both units carry the same 5-year warranty, but the Apex 300 is rated for 6,000 cycles against the DELTA's 3,500
Why it mattersStop comparing the stickers and go add up your simultaneous load. That figure, not your budget, tells you which of these two you're actually shopping for.
A firmware fault in a camping battery is an irritation. In the box wired to your critical loads it's a failure mode that surfaces on the one night the thing exists for. And the DELTA's clean record here is not a clean record, it's an empty one, so this is a known problem against an unmeasured one rather than a buggy unit against a solid one.
Four separate Apex 300 posts describe firmware updates causing trouble: a unit locked in Backup modeB1, a charge halting at 97% with Error 004B2, Bluetooth and Home Assistant links dropping after an updateB3, and an app looping an update it has already appliedB4Both units are bought as backup and both switch over in 10msThe DELTA Pro Ultra X file contains no owner posts at all, only manufacturer material and reviews written from itA1A2A3A4
Why it mattersBuy the Apex and treat firmware like a scheduled maintenance window: never during a storm week, and never with the update prompt sitting unanswered going into one.
The real gap between these isn't the $6,300, it's that one of them you unbox on a Saturday and the other comes with a calendar appointmentA4. That install is money bonded to a building. Spend it in a house you own for a decade and it disperses into nothing; spend it eighteen months before a move and you've improved someone else's property.
DELTA Pro Ultra X weighs 298.7 lbs, and its 12,288Wh base is two 6,144Wh modulesA2EcoFlow's own pitch for it is a quick-connect installation ready in about seven daysA4Apex 300 weighs 83.78 lbs, and reviewers who handled it call the handles and modular design workable while also reporting they couldn't lift it onto a tableB6B8
Why it mattersIf you rent, or a move is anywhere on your horizon, the Apex wins on placement alone, before a single performance spec gets a vote.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The Apex 300 is rated for 6,000 cycles against the DELTA's 3,500 on the same five years, which puts its lifetime cost per kilowatt-hour at roughly half, so the $6,300 price gap buys quantity at a worse rate.
cost / lifetime kWh
Identical warranties but very different cycle ratings — 6,000 on the Apex 300 against 3,500 — are why these columns land nine cents apart, and the nine cents is the interesting part. EcoFlow isn't charging extra for the badge, but it isn't matching BLUETTI's rate either: the DELTA sells stored energy at about twice the price per lifetime kilowatt-hour, in wildly greater quantity, and the $6,300 buys that quantity rather than cheaper energy.
Where they genuinely diverge is the cost of guessing wrong. Guess low on the Apex and you're out $1,699 with an expansion path in front of you. Guess high on the DELTA and you've committed $7,999 plus a scheduled installA4 to capacity you will never cycle, and a battery you don't cycle is precisely the one that never reaches its 43,008 kWh. The cheap mistake here is recoverable and the expensive one is masonry.
Your Life, Your Pick
Selected because: Read for pass and fail instead of headroom, the Apex 300 clears five of these six loads and misses only the 4,685Wh van-life day, by 2,335Wh.
Read this board for pass and fail rather than headroom and it's five to one. The Apex 300 covers the camping weekend, the eight-hour blackout, the CPAP night, the workday and the tailgate. It fails van life, by 2,335Wh, and that's the only outright miss on the page. The DELTA covers all six with room to spare, which is what 12,288Wh is for, but headroom you never draw on isn't a feature you bought.
One thing worth knowing about the board itself: it has no category for an installed system. Weekend Camping and Tailgate Party are scored as though you drove there with the unit, and the logic behind them rewards the lighter box as the more convenient one. Both of these are things you place and wire, not things you load into a car. Take those two rows as pure capacity arithmetic and ignore everything they imply about a parking lot.
Portability & Form Factor
Selected because: At 298.7 lbs and 83.78 lbs these are both placement decisions, and one of them arrives with an installation schedule attached.
weight
Ask where it goes and who puts it there, not what it weighs. The Apex 300 is a one-person move if you're determined about it, which is why reviewers can simultaneously call the handles and modular design manageable and admit they couldn't get it onto a tableB6B8, and why the sensible home for it is a utility space, a cupboard under a sink, or an RV bay it doesn't leaveB9. The DELTA Pro Ultra X isn't a lift in any configuration. Its base is two 6,144Wh modulesA2 and EcoFlow's own selling point is a quick-connect install measured in days, about seven of themA4.
That's the difference the price tag hides, and it lands before any spec does. One of these is a purchase and the other is a project. If you own the house and you're staying, the project is fine and the seven days are a footnote. If you rent, or you're two years from a move, the Apex is the only one of the two you can take with you.
Growth Path
Selected because: Adding batteries to the Apex 300 buys hours, not watts: the 3,840W inverter is the same inverter afterward.
solar input
Both expand, into different things. Batteries bolt onto the Apex 300 and buy hours; they do not buy watts, and the 3,840W inverter is the same inverter the morning after. Getting more output means a second Apex and BLUETTI's parallel box at around $699B12, and that's where the value quietly inverts: $1,699 twice plus the box is $4,097 for 5,529.6Wh, roughly 74 cents a watt-hour, against the DELTA's $7,999 for 12,288Wh at 65 cents. The budget unit stops being the budget unit the second you need two of them.
The DELTA's ceiling is the murkier half of its own pitch. It scales by adding inverters as well as batteries, and the sources in our file disagree on the top-end figure depending on which one you openA2, so we're not printing a number we can't stand behind. If the ceiling is why you're buying, make EcoFlow write it onto your quote for your exact configuration. The part of its growth story that isn't in dispute is the solar: 10,000W of input against the Apex's 2,400W is the difference between feeding a bank as it grows and outgrowing your array in year two.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra X
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$6,300) than the Apex 300.
- –Significantly heavier (+214.9 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 3,500 charge cycles vs the Apex 300's 6,000, so it wears out sooner.
BLUETTI Apex 300
Strengths
- +Costs $6,300 less
- +Lighter by 214.9 lb
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-8,160W) limits appliance compatibility.
- –Very 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 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Apex 300
Both clear a 2,100Wh weekend, and the DELTA takes the row on what's left afterward: 8,345Wh against the Apex's 250Wh. Sit with that 250Wh for a second. A CPAP night on this same page asks for 320Wh, so the Apex finishes the weekend without enough in the tank for the lightest overnight load we test. It's a pass. It just has no second act in it.
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 X
Both ride out eight hours on 1,645Wh, and the Apex ends the evening still holding 705Wh. The DELTA takes the row on 8,800Wh of spare, and what that spare actually buys is the five more eight-hour stretches after this one, not this one. For a single bad evening these two are equivalent; the extra money only starts working when the outage refuses to end.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
DELTA Pro Ultra X
A 320Wh night is a rounding error for both of these, so the percentages here are a formality and the fan-noise ratings aren't the right tiebreak either at a load this small. Break it on nights of autonomy instead. The Apex has 2,030Wh left after the first night, which is six more like it. The DELTA has 10,125Wh, which is thirty-one. That's the real gap: how long before somebody has to go find a generator.
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 X
910Wh is a working day's draw, and the Apex ends it at 39% with 1,440Wh in reserve, a second full day and change. The DELTA takes the scenario, and the win is both real and beside the point. Nobody buys 12,288Wh to get through a Tuesday.
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
Apex 300
670Wh is the lightest load on the board and both units shrug at it: 1,680Wh left in the Apex, 9,775Wh in the DELTA. The DELTA takes the row on headroom nobody at a tailgate will ever draw on, from a unit that weighs 298.7 lbs.
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 X
The Apex covers about half a van-life day and stops. 2,350Wh usable against 4,685Wh needed leaves it 2,335Wh short, and this is the only outright failure on the board. BLUETTI expansion batteries fix it, genuinely, but that's a purchase to make on day one rather than discover in month two. The DELTA finishes the same day with 5,760Wh still in it, more than twice everything the Apex holds usable when full.
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 X runs 51h vs 11.5h.
$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 0–696.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–139.3hHigh-Draw Appliances
These reveal the real limitsscale 0–10.4h¹ 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 BLUETTI Apex 300
Take the Apex 300 unless you can name the load that breaks it. At $1,699 it clears five of the six scenarios on this page, and the sixth, a 4,685Wh van-life day, it misses by 2,335Wh, which BLUETTI sells expansion batteries to fix. Over their rated lives the two units cost within a penny of each other per kilowatt-hour delivered, so the $6,300 between them is not a quality premium, it is four and a half times as much energy bought at the same rate. The DELTA Pro Ultra X becomes the right answer at exactly one trigger: a continuous draw the Apex's 3,840W inverter can't hold. Expansion won't get you there, because adding batteries adds hours, and scaling the Apex the other way costs more per watt-hour than the DELTA does. Two Apexes plus BLUETTI's parallel box at around $699B12 is $4,097 for 5,529.6Wh, about 74 cents a watt-hour, against $7,999 for 12,288Wh at 65 cents. So add up what has to run at the same moment: over 3,840W, stop pricing the Apex; under it, stop pricing the DELTA.
Today the Apex 300 is $1,499, $200 under its typical $1,699. The verdict weighs typical prices, not today's. Prices checked 1 day ago.
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 BLUETTI's current prices.
$1,499.00 · direct from BLUETTI
down from $1,699 · 12% below usual
Last checked 1 day ago. Prices move — check before you buy.
or check the DELTA Pro Ultra X price$7,999.00 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): UPS, RV Living, Solar Generator.
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 X rates 4.3/5 (61st percentile of 29 Whole-Home / Off-Grid-class units), and Apex 300 rates 5.0/5 (99th percentile of 26 Large-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.
Weight Is a Placement Decision, Not a Lift
Neither of these is a lift you plan around. They're locations you commit to. The Apex 300 at 83.78 lbs is a both-hands, one-person, do-it-once move into a utility room or an RV bay, not something that comes out for the weekend. The DELTA Pro Ultra X at 298.7 lbs isn't a lift in any sense: it gets positioned, wired in, and left. Ask where it goes and who puts it there before you ask what it weighs.
45dB Is the Under-Load Number
45dB is what the Apex 300 is rated at under load, and under load is the operative half of that sentence. At an overnight CPAP-sized draw of 320Wh, neither unit is working hard enough for its fan rating to describe your bedroom. The DELTA Pro Ultra X's 30dB rating is genuinely the better number and we'd take it given the choice. It just isn't the evidence you want it to be about a trickle load.
Surge Ceiling: 45,000W Against 7,680W
The DELTA Pro Ultra X holds 45,000W of surge over 12,000W continuous. The Apex 300 holds 7,680W over 3,840W, which is exactly 2x. Worth being fair about that: 2x is the bar this check sets, and the Apex clears it rather than fails it. The figure that actually constrains you is the absolute one. 7,680W is a hard ceiling on how many motors can start in the same instant, and adding expansion batteries raises capacity, not that number.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. The Apex 300's figure is a maximum rather than a guarantee — it depends on buying direct from BLUETTI or registering the unit, since reseller purchases carry a shorter term. Worth saying because the per-dollar framing can suggest otherwise: the Apex 300 works out at 2.9 years of cover per $1,000 spent against the DELTA Pro Ultra X's 0.6, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The Apex 300 is rated for 6,000 cycles vs 3,500. In real life: at daily use, that's 16.4 vs 9.6 years. At weekend use (twice a week), it's 58 vs 34 years. One caution reading years across different sizes: a cycle is 2,765Wh on the Apex 300 and 12,288Wh on the DELTA Pro Ultra X, so count lifetime energy — roughly 16,589 kWh against 43,008 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
Full record above — the Test Desk pick is the Apex 300.
Check Apex 300 price →or check the DELTA Pro Ultra X 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 Apex 300 wins on both sticker price and long-term value. At $0.1/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. One caution on the lifespan row: the Apex 300 takes longer to reach its cycle rating, but a cycle moves a different amount of energy on each unit — the DELTA Pro Ultra X still delivers more over its shorter horizon (43,008 vs 16,589 kWh). Years measure wear, not usefulness.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the very top of the range, the DELTA Pro Ultra platform stacks batteries and inverters into whole-home backup — a flagship path, not a line-wide feature.
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 — 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 — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — 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 — 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 — 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 — no spare parts policy for some models. Some reports of erratic communication from support agents.
Analyst note
Both units carry the same five-year warranty, and neither company commits to much after it lapses: EcoFlow states no out-of-warranty parts or service, and BLUETTI has no spare-parts policy for some older models. On a box you wire into a building and expect to keep for a decade, that's the line to read twice. Day to day the difference is response time and channel. EcoFlow answers a US phone number with polarized results; BLUETTI answers email on China hours and is the more inconsistent of the two, though buying direct from them tends to produce better outcomes. That asymmetry matters more the larger the thing you've installed, which is one of the few arguments on this page running in the DELTA's favor.
Growth path
DELTA Pro Ultra X
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 10,000W 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.
Apex 300
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 2,765Wh.
Accepts up to 2,400W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the DELTA Pro Ultra X's higher solar ceiling (10,000W vs 2,400W) 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 X
There is no owner evidence for the DELTA Pro Ultra X. Not thin, none. Everything in our file traces back to EcoFlow's own material or to reviews written from it: 12kW continuous across every circuit including a 5-ton ACA1, a base of two 6,144Wh LFP packsA2, EV-grade cells under 24/7 BMS supervision with solar input to 10kWA3, a quick-connect install and a CES 2026 Innovation Award at $7,999A4. Those are capability claims, and capability claims are the thing manufacturers are best at. Not one of them is a report of the system still behaving in month nine.
Be precise about which way that absence cuts. It is not evidence the system is trouble-free, and it isn't evidence against it either. On a $7,999 purchase with an installation attached, it means you are an early adopter of a nearly unreviewed platform, and the sensible hedge is buying through a channel whose return policy you would actually be willing to use.
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
Sources
ecoflow.com · outboundpower.com · bobvila.com · thesolarlab.com
BLUETTI Apex 300
The Apex 300's field record is short and tilted toward complaints, and where it comes from matters: BLUETTI's own support forum and a GitHub issue trackerB1B2B3B4, which are the places people go when something is broken. As a failure rate that sample is meaningless. As a pattern it's specific and consistent, and it's four separate posts about firmware rather than hardware. A unit stuck in Backup mode after an updateB1. A charge that halted at 97% with Error 004B2. Bluetooth and Home Assistant links dropping after a firmware pushB3. An app that keeps offering an update it has already installedB4.
The rest reads like early reviews of a well-built box. Fans described as tame next to units that sound like small jet enginesB5. The weight called manageable-with-handles by one reviewer and barely-liftable by anotherB6B8. An app still sluggish next to EcoFlow'sB10. Rubber port bungs that are excellent under a sink and irritating with an oversized plugB9. One conflict we can't resolve: reviewers who handled the unit describe no USB or DC ports on its face plus a roughly $300 hub to add themB7B11, while the spec sheet in front of us lists 100W USB-C. Until that's settled, don't let ports decide this either way. Confirm what's physically on the chassis with whoever is selling it to you.
“I was using Bluetti-bt until the latest Bluetti firmware update. I then started having disconnects.”
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Whole-home 12kW output, massive scalability (to 184kWh), EV-grade LFP, 10kW solar, and fast install are the standout features. [DELTA Pro Ultra X · 3 entries]
- Multiple owners report firmware updates causing app glitches, mode-lock issues, error codes, or Bluetooth/Home Assistant disconnects shortly after updating. [Apex 300 · 4 entries]
- Reviewers consistently flag the lack of built-in USB/DC ports as a design tradeoff requiring costly add-on accessories (Hub D1, Hub A1). [Apex 300 · 4 entries]
- The unit's extreme weight (~85 lbs) is repeatedly described as making it barely 'portable' and hard to carry alone. [Apex 300 · 2 entries]
- A1
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X review · 2026 · [positive]
- A2
“Base 12.288kWh of LFP storage (6,144Wh x 2), expandable to 61.44kWh with one inverter and up to 184.32kWh with three inverters and thirty batteries.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X · 2026 · [positive]
- A3
“EV-grade full-tab LFP cells with a multi-layer safety architecture and 24/7 BMS oversight; solar charging up to 10kW.”
ecoflow.com / bobvila.com — DELTA Pro Ultra X review · 2026 · [positive]
- A4
“A quick-connect design cuts installation time and cost by up to 80%, ready in about 7 days; a CES 2026 Innovation Award Honoree at a $7,999 base price.”
ecoflow.com / thesolarlab.com — DELTA Pro Ultra X review · 2026 · [positive]
- B1
“I updated my Apex 300 to the latest firmware yesterday. Now it's stuck in 'Backup' mode... Now when I go into the app to try to change it back, it flashes to...”
BLUETTI Community forum — 'Apex 300 stuck in Backup mode after last firmware update' · 2025-11 · [negative]
- B2
“When the system reached 97% charge, I decided to install the firmware updates. After the update completed, the charging stopped and I received Error 004.”
BLUETTI Community forum — 'Error E004 Apex 300' · 2025-11 · [negative]
- B3
“I was using Bluetti-bt until the latest Bluetti firmware update. I then started having disconnects.”
GitHub bluetti-official/bluetti-home-assistant issue #95 — 'APEX 300 and Hub A! now working' · 2026-05 · [mixed]
- B4
“Problem is every time I connect to the power station it shows that I still have an update, and I need to tap to upgrade which then tells me I am up to date.”
BLUETTI Community forum — 'Check For Update App issue' · 2025-09 · [negative]
- B5
“Some units sound like small jet engines under load, but the Apex 300's fans are relatively tame.”
Techspective — 'Bluetti Apex 300 with B300K Review' · 2025-09 · [positive]
- B6
“It's heavy, no question, but the handles and modular battery design make it manageable.”
Techspective — 'Bluetti Apex 300 with B300K Review' · 2025-09 · [mixed]
- B7
“Not having DC or USB ports on the face is a tradeoff. The Hub D1 solves the problem—but it's an additional $300 accessory that you then have to bolt on after the fact.”
Techspective — 'Bluetti Apex 300 with B300K Review' · 2025-09 · [negative]
- B8
“In fact, it's so heavy I can hardly carry it more than a few feet at a time and have been unable to lift it onto a table.”
T3 — 'Bluetti Apex 300 review: transform your off-grid life' · 2025-11 · [negative]
- B9
“Each is protected by a rubber bung, which is good if you've got the Apex 300 below the sink in a utility room or RV. It can be annoying when it comes to inserting oversized plugs or adaptors, though.”
Trusted Reviews — 'Bluetti Apex 300 Review' · 2025-10 · [mixed]
- B10
“The Bluetti app is still a little sluggish compared to the EcoFlow or Anker apps, but it lets you toggle power modes, monitor stats, and tweak settings from a distance.”
TheSolarLab — 'Bluetti Apex 300 Review: Cheap, Practical Home Backup?' · unknown · [mixed]
- B11
“That 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.”
TheSolarLab — 'Bluetti Apex 300 Review: Cheap, Practical Home Backup?' · unknown · [negative]
- B12
“Say you want to connect multiple Apex 300 power stations together, you'll need to buy the Bluetti Hub A1 Parallel Box, which retails for around $699!”
TheSolarLab — 'Bluetti Apex 300 Review: Cheap, Practical Home Backup?' · unknown · [negative]
Research compiled August 9, 2026.
What Owners Actually Report
Drawn from 30 comments on independent review channels — not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.
EcoFlow DELTA Pro Ultra X
11 claims from 7 comments · 2 from owners · 0 with figures
- Shipping
- 1 · 100% negative
- Build quality
- 2 · 82% negative
- Price & value
- 3 · 100% negative
- Solar input
- 2 · 48% negative
- Expandability
- 2 · 0% negative
What owners complain about
Ordered a DPUX at launch and was shipped a plain DPU battery instead; returned it.
Shippingowner9 agreedsource →
Refuses to use the included DC isolator rotary switch over arc-fault fire risk; uses own breakers.
Build qualityowner1 agreedsource →
Believes EcoFlow relabeled the DPU battery as DPUX and raised the price.
Price & value9 agreedsource →
What owners praise
Says it is the exception among portables that is not solar-input limited, at a much higher price.
Solar input6 agreedsource →
An excellent whole-home backup alternative to a traditional generator.
Other4 agreedsource →
Adding batteries or a second inverter is plug-and-stack versus bus bars, fuses and conduit.
Expandability5 agreedsource →
BLUETTI Apex 300
36 claims from 23 comments · 18 from owners · 6 with figures
- Price & value
- 10 · 8% negative
- Solar input
- 6 · 53% negative
- Inverter & surge
- 2 · 0% negative
- Build quality
- 2 · 0% negative
- Runtime
- 2 · 100% negative
What owners complain about
TV, router, Tablo and Firestick drain it from 100% in 7-9 hours; runtime figures are lies.
Runtimemeasuredownersource →
Dropping to a 60V PV max is a deal killer versus the 150V per string they run on the AC300.
Solar inputowner1 agreedsource →
App is portrait-only.
App & firmwareownersource →
What owners praise
Two paralleled units give 7,680W and run dryer, 2-ton AC or oven plus fridges and sump pump.
Inverter & surgemeasuredowner5 agreedsource →
$2,600 for two units plus $659 for the Hub A1 was worth the extra over the Anker.
Price & valuemeasuredowner5 agreedsource →
Three Apex 300s with a Hub A1 give him 18kW solar input and 12kW output.
Solar inputmeasuredownerafter 1 months10 agreedsource →
Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results — for measurements we ran ourselves, see the methodology.
Who Should Buy Which
Buy the DELTA Pro Ultra X if you…
- →You've added up everything that must run at the same moment and it clears 3,840W. That's the entire DELTA case, and when it's true it isn't close: 12,000W continuous with 45,000W of surge behind it.
- →You own the house and you're staying in it. A seven-day quick-connect installA4 amortizes beautifully over a decade and miserably over two years.
- →You're building out serious solar. 10,000W of input against the Apex's 2,400W is the difference between a bank you can keep feeding and an array you outgrow.
Buy the Apex 300 if you…
- →You want an eight-hour outage to be a non-event. That's 1,645Wh on this page's math, and the Apex finishes it still holding 705Wh, for $1,699.
- →It's going into a utility room, a cupboard, or an RV bay and living thereB9. For a thing you position once and forget, the weight is a one-afternoon problem.
- →You rent. Nothing about the Apex is a fixture, and it goes in the car when the lease ends.
- →You want backup now and more of it later, and you're willing to buy the expansion batteries as part of the same decision rather than discovering you need them in month two.
If neither fits
If you pictured carrying this to a campsite or across a parking lot, close the tab and go look at the class of unit you can pick up one-handed. The lighter of these two weighs 83.78 lbs and a reviewer still couldn't get it onto a tableB8. And if you need a 4,685Wh van-life day on a tight budget, neither base unit answers it: the Apex is 2,335Wh short and the DELTA is a house-scale installation. Price the Apex plus expansion batteries as one purchase and compare that against a wired van system before you commit to either.
The Bottom Line
Take the Apex 300. It's about half the cost per kilowatt-hour over its life, a quarter of the price today, and it handles five of the six loads on this page, with the one miss covered by expansion batteries BLUETTI already sells. The DELTA Pro Ultra X simply sells more energy, at close to twice the rate per lifetime kilowatt-hour, which is exactly why buying it without a load above 3,840W on your list is $7,999 spent on headroom you'll never cycle.
So do the boring thing before you do the expensive one and add up what has to run at the same moment. Under 3,840W, the Apex was always the answer and everything above it on this page is a distraction. Over 3,840W, the Apex was never in the running, and no amount of expansion changes that. The number you need is on your breaker panel, not on this page.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Why is the DELTA Pro Ultra X almost five times the price of the Apex 300?
Because it holds four and a half times as much energy — though the two aren't priced at the same rate. Over its rated 3,500 cycles the DELTA works out to 19 cents per kilowatt-hour delivered, against 10 cents for the Apex 300 over its 6,000. You're buying a much bigger quantity, at close to twice the price per kilowatt-hour.
Can the Apex 300 run a whole house?
It runs 3,840W continuously with 7,680W of surge, which handles a normal set of household essentials but is nowhere near a full panel. The DELTA Pro Ultra X runs 12,000W with 45,000W of surge and is built for every circuit including a 5-ton AC. The honest test is to add up what has to run simultaneously: if that number is over 3,840W, the Apex was never a candidate.
Can I just buy an Apex 300 now and expand it up to DELTA territory later?
Not economically, and not in the dimension that matters. Expansion batteries add hours, not watts, so the inverter stays at 3,840W. Adding output means a second Apex plus BLUETTI's parallel box at around $699, which comes to $4,097 for 5,529.6Wh, about 74 cents a watt-hour against the DELTA's 65, and still only 7,680W continuous. If you already know you'll need the bigger system, buying it twice is the expensive route.
How much can the DELTA Pro Ultra X actually expand to?
It scales by adding inverters as well as batteries, so the ceiling depends on the configuration you buy, and the sources in our research file give different top-end figures. We won't quote one we can't verify. If maximum capacity is the reason you're choosing this system, ask EcoFlow to state the ceiling for your specific inverter and battery count in writing before you order.
Does the Apex 300 have USB and DC ports built in?
Our spec sheet lists 100W USB-C, but reviewers who physically handled the unit report no USB or DC on the face and a roughly $300 BLUETTI hub to add them. We can't reconcile those two accounts, so we've built no part of this comparison on ports. Confirm the port layout of the exact SKU with the seller before you order, especially if you were planning to charge devices directly from it.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow DELTA Pro Ultra X
$7,999.00
$7,999.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
BLUETTI Apex 300Pick
$1,499.00
$1,499.00 · direct from BLUETTI
down from $1,699 · 12% below usual
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.