Head-to-head test
EcoFlow DELTA Pro Ultra vs BLUETTI Apex 300 + B500K
Unlike every other matchup in this class, these two share an identical 3,500-cycle rating, so the price gap is pure capacity-per-dollar — and what the DPU's extra money actually buys is an inverter nearly double the size and a track record without the Apex system's firmware growing pains.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
EcoFlow
DELTA Pro Ultra
8,600Power Score · The AC & Fridge Zone
$3,999.00 list · direct from EcoFlow
BLUETTI
Apex 300 + B500K
7,760Power Score · The AC & Fridge Zone
$3,299.00 list · direct from BLUETTI
Spec deltas
The BLUETTI Apex 300 + B500K holds 7,884.8Wh for $3,199. The EcoFlow DELTA Pro Ultra holds 6,144Wh for $4,099. Both share an identical 3,500-cycle rating, so unlike the other comparisons in this class, there's no chemistry story explaining the gap — the Apex system is simply a bigger, cheaper battery.
What the DPU's extra $900 buys instead is a 7,200W continuous inverter against the Apex system's 3,840W, a solar ceiling more than double, and a track record without a documented pattern of firmware issues. The Apex system is new enough that no source describes six-plus months of ownership on this exact configuration.
Buy the Apex system if your loads are light, sequential, and you're comfortable troubleshooting an occasional firmware update. Buy the DPU if you need a bigger inverter or a platform that's already finished settling in.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
The DPU's higher price buys a 7,200W continuous inverter against the Apex system's 3,840W, nearly double the output for $900 more — a cleaner, more honest tradeoff than the cycle-life gaps that decide most other matchups in this class.
The Apex 300 + B500K holds 7,884.8Wh for $3,199 against the DPU's 6,144Wh for $4,099Both share an identical 3,500-cycle rating
Why it mattersBuyers who just need bulk cheap storage for light, sequential loads should take the Apex system's economics; buyers running anything that draws hard and steady need the DPU's bigger inverter regardless of the per-kWh math.
Both can be true if the praise describes lighter, more typical draw and the 45dB figure reflects genuine peak load. Either way, the manufacturer's own load-tested number is the one worth planning around, not the press impressions.
BLUETTI rates the Apex 300 + B500K at 45dB under load, against the DPU's 30dBMultiple independent reviewers separately describe the Apex 300's fan as notably quiet, even comparing it favorably to EcoFlow's unitsB1B2B13
Why it mattersIf you're running it near a bedroom or office at real output, plan for the rated 45dB, not the quieter anecdotal reports.
Layer in the Apex system's stripped port selection, no USB or DC ports beyond six AC outlets and a pair of high-voltage connectorsB12, and the picture is a young, still-settling platform: bigger and cheaper, but asking for an early adopter's patience in return.
Multiple independent owner threads describe firmware updates causing mode-lock, app connection failures, and inverter error codes on the Apex 300, several resolved only after further updates or support contactB7B8B9B10Owners running multiple Apex 300 units in parallel report uneven charge rates requiring unofficial community workaroundsB3B4
Why it mattersBuyers who want a platform that's already finished settling in should lean toward the DPU's established track record; buyers comfortable troubleshooting firmware updates get a real price break on the Apex system.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: Same cycle life on both sides makes this the cleanest capacity-per-dollar comparison in the class.
cost / lifetime kWh
Unusually for this class, cycle life isn't the story: both units share an identical 3,500-cycle rating, so the DPU's higher $0.19 per lifetime kWh against the Apex system's $0.12 comes down to pure capacity-per-dollar, 6,144Wh for $4,099 against 7,884.8Wh for $3,199.
Cost-per-warranty-year still tilts toward the DPU, $410 against $640, because its 10-year term is double the Apex system's 5. Buy for the long haul and the DPU's number looks better even though the per-kWh math favors the Apex system outright.
What the Specs Don't Tell You
Selected because: Weight is a wash for once — noise, output, and ports are what actually separate them.
The gotcha that usually decides these matchups is a wash here: 181.8 lbs for the DPU against 183 for the Apex system, essentially identical. What actually separates them is noise and output. BLUETTI rates the Apex system at 45dB under load against the DPU's 30dB, even though several independent reviewers separately call the Apex 300's fan notably quiet — plan around the rated number, not the anecdotes.
Output tells a cleaner story: 7,200W continuous for the DPU against 3,840W for the Apex system, and a 0ms true online UPS against the Apex system's under-10ms line-interactive switch. The Apex system's port selection is also worth knowing before you buy: six AC outlets and a pair of high-voltage connectors, no USB or DC without a separate hub.
Growth Path
Selected because: Solar ceiling gap plus real reports of uneven charging when scaling past one unit.
solar input
Both systems expand, but the DPU's solar ceiling is more than double the Apex system's, 5,600W against 2,400W. That's a real gap in refill speed during a multi-day outage, on top of the DPU's larger continuous-output advantage.
Owners running multiple Apex 300 units in parallel report uneven charge rates between units, with unofficial community workarounds needed to keep them synced — worth knowing if your growth plan involves scaling past one unit.
Brand Trust
Selected because: BLUETTI's value proposition vs EcoFlow's speed and track record is the real cross-brand story here.
BLUETTI's lineup is the broadest in the category, and its capacity-to-price ratio is the best of any major brand, which is exactly what shows up in this matchup's lifetime-cost numbers. EcoFlow's own strength is speed: faster charging tech and the largest community in the space.
Support is BLUETTI's acknowledged weak point, heavily email-based with real timezone delays, though buying direct from BLUETTI tends to produce better outcomes than through third-party retailers. EcoFlow's support is more polarized than uniformly worse, but neither brand here is the strong-support pick.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra
Strengths
- +Lighter by 1.2 lb
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI Apex 300 + B500K
Strengths
- +Costs $700 less
- +Larger battery capacity
Trade-offs
- –Weaker inverter (-3,360W) 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
Either unit
Both handle two nights comfortably. The DELTA Pro Ultra uses 40% and the Apex 300 + B500K uses 31%. With this little difference, pick based on weight and portability instead. The lighter unit wins for car camping.
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
Either unit
Both survive the blackout with similar margin. Since the capacity difference doesn't matter here, focus on which unit has UPS mode — seamless switchover protects your router and PC from the split-second power gap.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
Either unit
Both are wildly overqualified for CPAP. You're using 6% or less. Save your money and buy whichever is cheaper; the extra capacity is completely wasted on a 40W overnight load. Put the savings toward a second battery for multi-night trips.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Either unit
Both power your workstation all day without breaking a sweat. At these utilization levels, prioritize the unit with better USB-C output for direct laptop charging. It's more convenient than using the AC inverter and wastes less energy.
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
Either unit
Both handle game day easily. Since capacity isn't the deciding factor, consider weight: the lighter unit is easier to load into a truck bed. Also check if either has Bluetooth speaker-level noise. Fan sound matters in social settings.
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
Apex 300 + B500K
The Apex system wins this one on paper, using 70% of its tank against the DPU's 90% for the same day. That capacity still has to move through a 3,840W inverter, nearly half the DPU's continuous output, so check what's actually plugged in before leaning on the number alone.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the six scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: Apex 300 + B500K runs 32.7h vs 25.5h.
$3,299 list · direct from BLUETTI
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 0–446.8hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–89.4hHigh-Draw Appliances
These reveal the real limitsscale 0–6.7h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
July 14, 2026
Verdict: the EcoFlow DELTA Pro Ultra
The Apex 300 + B500K wins the lifetime-cost math outright: $0.12 per kWh against the DPU's $0.19, on more capacity for $900 less. But this is a new platform, and its ledger reads like one — multiple independent owner threads describe firmware updates causing mode-lock, app errors, and inverter error codes, plus uneven charging when running units in parallel. Layer that on top of a 3,840W continuous inverter, nearly half the DPU's 7,200W, and a total absence of USB or DC ports, and the DPU's higher price buys a bigger, more capable, and more proven machine. Take the Apex system for cheap bulk storage on light loads if you're comfortable being an early adopter; otherwise take the DPU.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 14, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$3,999.00 list · direct from EcoFlow
or check the Apex 300 + B500K price$3,299.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 14, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
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 rates 4.9/5 (93rd percentile of 16 Home Backup-class units), and Apex 300 + B500K rates 3.6/5 (19th percentile of 17 Whole-Home / Off-Grid-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.
181.8 lbs vs 183 — A Rare Wash
For once the weight gotcha doesn't decide anything: these two are within a pound and a half of each other. Neither is a solo lift regardless of which one you choose.
Apex 300 + B500K: 45dB Under Load
That's 15dB louder than the DPU's rated 30dB, audible in a quiet room. That figure sits oddly next to reviewer praise calling the fan notably quiet under lighter loads. Plan around the rated number for real output.
Surge Power: Inverter Quality Indicator
The DPU surges to 10,800W, 1.5 times its 7,200W continuous rating. The Apex system surges to 7,680W, exactly double its own 3,840W continuous rating — a bigger multiplier off a smaller base, similar in shape to the DPU's own headroom but at a lower absolute ceiling.
True UPS vs Line-Interactive
0ms on the DPU means connected electronics never see a gap. The Apex system's line-interactive switchover is under 10ms, fine for most loads but not the same guarantee as a true online UPS.
Full record above — the Test Desk pick is the DELTA Pro Ultra.
Check DELTA Pro Ultra price →or check the Apex 300 + B500K 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 + B500K wins on both sticker price and long-term value. At $0.12/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
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 tech in the category and the deepest ecosystem for future expansion.
Worth knowing
A 2025 recall on a different EcoFlow model for overheating risk is worth knowing about, and support experiences are polarized between smooth and slow.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship (Apex 300, 3072Wh). 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
The best capacity-to-price ratio of any major brand in this category, with the widest model lineup from budget to flagship.
Worth knowing
Support is heavily email-based with real timezone delays; buying direct from BLUETTI tends to produce better outcomes than through third-party retailers.
Analyst note
BLUETTI wins on raw value and lineup breadth. EcoFlow wins on charging speed and a longer, more established track record on this specific class of unit.
Growth path
DELTA Pro Ultra
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 6,144Wh.
Accepts up to 5,600W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Apex 300 + B500K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 7,885Wh.
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's higher solar ceiling (5,600W 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
The headline claim on the DPU is scale: a single battery expandable to 90kWh across a system for whole-home backup, well past a month of essential circuitsA1 — a growth ceiling the newer Apex platform doesn't yet have an established track record to match.
That claim is backed by consistent, specific praise: reviewers describe quick setup, strong solar input, and an inverter that runs a 3-ton central AC without issueA4, plus a genuinely fast charge time and near-silent operation under moderate loadsA3.
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
Sources
ecoflow.com · homedepot.com · autoboosting.com · ecogadgethub.com
BLUETTI Apex 300 + B500K
This is a new platform with thin, still-forming field data. Most available commentary comes from forums and a GitHub issue tracker rather than long-term reviews, and no source found describes six-plus months of ownership on this exact configuration. What's there is genuinely mixed: independent reviewers separately praise the Apex 300's fan as notably quietB1B2B13, while owners report real firmware issues — mode-lock after an update, app connection failures, inverter error codes — mostly resolved after further updates or support contactB7B8B9B10.
The stripped-down design draws its own complaints: no USB or DC ports beyond six AC outlets and a pair of high-voltage connectorsB12, real weight that one reviewer says they could barely lift onto a tableB11, and uneven charge rates when running multiple units in parallel that owners have worked around themselves rather than through an official fixB3B4.
“Turns out the Apex 300's noise control is on par with the quietest power stations on the market, like those on offer from EcoFlow and DJI.”
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 scale (to 90kWh), 7,200W output, online UPS, silent operation under load, and industry-fast charging are the standout features. [DELTA Pro Ultra · 2 entries]
- Multiple independent reviewers describe the dual-fan cooling as noticeably quiet/even for a unit of this output class, even under load. [Apex 300 + B500K · 3 entries]
- Firmware and app updates have repeatedly caused mode-lock, download failures, or inverter error codes; several threads show the issue eventually resolved after further updates or support contact. [Apex 300 + B500K · 4 entries]
- When running multiple Apex 300 units or expansion batteries in parallel, owners report uneven charge rates between units, with community-devised (unofficial) workarounds needed to keep them in sync. [Apex 300 + B500K · 2 entries]
- The stripped-down, modular design draws criticism for real-world handling: extreme weight makes it hard to move, and lack of native USB/DC ports forces reliance on a separate paid hub accessory. [Apex 300 + B500K · 2 entries]
- A1
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
ecoflow.com / homedepot.com — DELTA Pro Ultra · 2026 · [positive]
- A3
“Industry-fast 8,800W charging tops up two batteries in about 2 hours; an online UPS protects sensitive electronics round the clock, and it runs at 0 dB (silent) for draws under 2,000W.”
ecoflow.com / ecogadgethub.com — DELTA Pro Ultra review · 2026 · [positive]
- A4
“Owners call it a powerful, easy-to-use whole-home backup with quick setup, strong solar input, and good app monitoring; its 7,200W inverter can power a 3-ton central AC.”
homedepot.com owner reviews — DELTA Pro Ultra · 2026 · [positive]
- B1
“Turns out the Apex 300's noise control is on par with the quietest power stations on the market, like those on offer from EcoFlow and DJI.”
The Solar Lab — "Bluetti Apex 300 Review: Cheap, Practical Home Backup?" · unknown · [positive]
- B2
“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]
- B3
“The Apex 300 have some major charging problems... When the units are charging from the grid they charge at different rates and not together.”
DIY Solar Power Forum — "Bluetti Apex 300 problems" · 2025-09 · [negative]
- B4
“I have found a simple way to get around some of the solar charging limitations with multiple APEX 300s hooked up in parallel... So far, I have not had any problems with my setup.”
DIY Solar Power Forum — "Bluetti Apex 300 problems" · 2025-09 · [mixed]
- B7
“I updated my Apex 300 to the latest firmware yesterday. Now it's stuck in 'Backup' mode... when I go into the app to try to change it back, it flashes to...”
BLUETTI Community — "Apex 300 stuck in Backup mode after last firmware update" · 2025-11 · [negative]
- B8
“There was an update on my Apex 300 a few days ago IOT v8026.12... Problem is every time I connect to the power st[ation]... Edit - This seems fixed now hooray!”
BLUETTI Community — "Check For Update App issue" · 2025-09 · [mixed]
- B9
“After the update completed, the charging stopped and I received Error 004... I have error E004 Inverter Output Failure.”
BLUETTI Community — "Error E004 Apex 300" · 2025-11 · [negative]
- B10
“I had a power outage in the middle of the night, so I hooked everything (Hub A1 and all 300's) back up and now HA is populating. YEA!!!”
GitHub bluetti-official/bluetti-home-assistant — "APEX 300 and Hub A1 now working" (Issue #95) · 2026-05 · [mixed]
- B11
“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]
- B12
“The Apex 300 doesn't have USB ports, DC ports, or much of anything beyond its six AC plugs and high-voltage connectors.”
The Solar Lab — "Bluetti Apex 300 Review: Cheap, Practical Home Backup?" · unknown · [negative]
- B13
“Fan noise remains even, with no distracting pitch or rattle. This makes the Apex 300 usable near sleeping areas or indoor workspaces without disturbance.”
Yanko Design — "BLUETTI Apex 300 Review" · 2025-05 · [positive]
Research compiled July 14, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra if you…
- →You want an established, long-track-record platform — the DPU's ledger is uniformly positive with no comparable pattern of firmware issues.
- →You need to run something that draws hard and steady; the DPU's 7,200W continuous output is nearly double the Apex system's 3,840W.
If neither fits
If you need to charge phones and small electronics directly from the unit, the Apex system's total absence of USB or DC ports rules it out without a separate hub purchaseB12 — and if that's your main use case, a smaller unit with a full port selection serves you better than either of these.
The Bottom Line
Both units share an identical 3,500-cycle rating, so unlike the other matchups in this class, the price gap here is pure capacity-per-dollar: the Apex system holds more for less and wins the lifetime-cost math outright, $0.12 per kWh against $0.19.
What the DPU buys instead is an inverter nearly double the size, a solar ceiling more than double, and a track record without the firmware issues multiple Apex owners have already hit. Take the Apex system for cheap bulk storage on light loads; take the DPU if you want the platform that's already finished settling in.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the BLUETTI Apex 300 + B500K cheaper to own than the EcoFlow DELTA Pro Ultra?
Yes, on paper — $0.12 per lifetime kWh against $0.19, with both units sharing an identical 3,500-cycle rating so the gap is pure capacity-per-dollar rather than a chemistry difference. The DPU's higher price buys a 7,200W continuous inverter against the Apex system's 3,840W, and a more established track record.
Is the Apex 300 actually quiet?
It depends which source you trust. BLUETTI's own spec rates it at 45dB under load, louder than the DPU's 30dB, but multiple independent reviewers separately describe its fan as notably quiet, even comparing it favorably to EcoFlow. Plan around the manufacturer's rated number for real output, not the anecdotal praise.
Can I charge a phone directly from the Apex 300 + B500K?
Not without a separate hub. Its port selection is six AC outlets and a pair of high-voltage connectors, no USB or DC ports at all — a real gap if small electronics are part of your use case.
Are there known reliability issues with the Apex 300?
Multiple independent owner threads describe firmware updates causing mode-lock, app connection failures, or inverter error codes, most resolved after further updates or support contact. It's a new platform, and the ledger reads like one — real bugs, not a single isolated complaint.
How much better is the DPU's solar recharging?
Its 5,600W solar ceiling is more than double the Apex system's 2,400W, meaningfully faster during a multi-day outage where you're relying on panels rather than a wall outlet.
Where to buy
EcoFlow DELTA Pro UltraPick
$3,999.00
$3,999.00 list · direct from EcoFlow
BLUETTI Apex 300 + B500K
$3,299.00
$3,299.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.