Head-to-head test
EcoFlow DELTA 3 Ultra Plus vs BLUETTI Apex 300 + B300K
The DELTA 3 Ultra Plus weighs less than half as much as the Apex 300 + B300K (77.2 lbs against 148.8) and runs 15dB quieter, but the Apex covers every real-world scenario tested — including Van Life Daily, which the Ultra Plus misses by 79 percentage points of its own tank.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
EcoFlow
DELTA 3 Ultra Plus
5,220Power Score · The AC & Fridge Zone
$1,499.00 list · direct from EcoFlow
BLUETTI
Apex 300 + B300K
6,552Power Score · The AC & Fridge Zone
$2,599.00 list · direct from BLUETTI
Spec deltas
The EcoFlow DELTA 3 Ultra Plus weighs 77.2 lbs; the BLUETTI Apex 300 + B300K weighs 148.8 lbs stacked — the Apex is nearly twice as heavy for a unit that costs $1,100 more.
That extra weight buys 5,529.6Wh of capacity against the Ultra Plus's 3,072Wh, and it shows up in the scenario math: the Apex wins five of the six tested scenarios outright, missing only a tie on CPAP Overnight, where both have capacity to spare.
The Ultra Plus answers with a genuinely quiet fan profile — reviewers repeatedly compare its noise under load to EcoFlow's premium DELTA Pro Ultra lineA1A2 — and a lower cost per lifetime kWh. It's the better unit for anyone whose daily draw fits its tank; it's the wrong unit for anyone whose daily draw doesn't.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
weight
Weight and noise both compound the same way: a lighter, quieter unit gets moved and used more often, while a heavy, louder one tends to get set down once and left alone.
The Apex 300 + B300K weighs 148.8 lbs stacked; the DELTA 3 Ultra Plus weighs 77.2 lbsThe Apex is rated 45dB under load; the Ultra Plus is rated 30dB, and reviewers describe its fans as never becoming 'annoying or distracting' even at maximum outputA2
Why it mattersAnyone who needs to relocate the unit regularly, or who cares about fan noise in a shared space, should weight the Ultra Plus heavily despite its smaller tank.
Capacity
A lighter, cheaper unit that can't complete the day's actual job isn't a value pick for that job; it's the wrong tool.
Van Life Daily needs 4,685Wh; the Ultra Plus's 3,072Wh capacity needs 179% of its own tank to cover that dayThe Apex 300 + B300K's 5,529.6Wh capacity covers the identical day at exactly 100%
Why it mattersFull-time van lifers or anyone with a comparable daily load should go straight to the Apex regardless of the Ultra Plus's price and weight advantages.
cost / lifetime kWh
Cost-per-kWh only tells you what a watt-hour costs, not whether the unit holds enough watt-hours to do the job — the Apex's larger tank and faster solar input matter more than the extra penny once the scenario outgrows the Ultra Plus.
The Ultra Plus costs $0.12 per lifetime kWh against the Apex's $0.13The Apex wins five of six tested scenarios outright, and its solar ceiling (2,400W) is 800W higher than the Ultra Plus's 1,600W
Why it mattersBuyers should size the tank to the job first and treat the cost-per-kWh gap as a tiebreaker only after confirming the smaller unit actually covers their real use case.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Apex wins five of six tested scenarios, the clearest signal on the page.
The Apex wins Weekend Camping, the 8-Hour Blackout, Remote Workday, Tailgate Party, and Van Life Daily outright. The two units tie only on CPAP Overnight, where both have enough spare capacity that the extra tank goes unused either way.
Van Life Daily is the decisive one: the Ultra Plus needs 179% of its own 3,072Wh tank to cover a full day's 4,685Wh draw, meaning it simply cannot finish without recharging mid-day. The Apex covers that identical day at exactly 100%.
Portability & Form Factor
Selected because: Nearly 2x weight and 15dB noise gap in the Ultra Plus's favor, worth its own section.
weight
The Ultra Plus weighs 77.2 lbs against the Apex's 148.8 lbs stacked — under half the weight for a unit that costs $1,100 less. It's also the quieter of the two by 15dB, 30dB against 45dB under load, and reviewers repeatedly liken its fan behavior at full output to EcoFlow's premium DELTA Pro Ultra lineA1A2.
The Apex's extra weight buys 2,457.6Wh more capacity. If the job fits inside the Ultra Plus's tank, there's no reason to carry the extra 71.6 lbs to get there.
Lifetime Value
Selected because: Ultra Plus is cheaper to own, the honest counterweight to the scenario losses.
cost / lifetime kWh
The Ultra Plus costs $0.12 per lifetime kWh against $0.13 for the Apex, and $300 per warranty year against $520 — genuinely cheaper to own, watt-hour for watt-hour.
That edge is real but small next to the scenario gap. A one-cent-per-kWh saving doesn't help if the tank runs out mid-task; it only pays off for buyers whose daily draw actually fits inside 3,072Wh.
What the Specs Don't Tell You
Selected because: Weight, noise, and warranty cards fire and reinforce the portability story.
rated cycles
Weight fires as a warning and it's the Ultra Plus's clearest structural win — nearly half the mass of the Apex stacked. Noise is informational here: the Apex's 45dB rating under load is respectable on its own, it just isn't as quiet as the Ultra Plus's 30dB.
The warranty card is informational too: both carry 5-year coverage, and the Ultra Plus costs less per warranty year mainly because it costs less to buy.
Strengths & trade-offs
EcoFlow DELTA 3 Ultra Plus
Strengths
- +Costs $1,100 less
- +Lighter by 71.6 lb
Trade-offs
- –No major technical downsides compared to rival.
BLUETTI Apex 300 + B300K
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$1,100) than the DELTA 3 Ultra Plus.
- –Significantly heavier (+71.6 lbs), making it harder to move.
- –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 + B300K
The DELTA 3 Ultra Plus cuts it close at 80%. One cold night or an unexpected device and you're rationing power. The Apex 300 + B300K finishes at 45%, leaving real headroom for spontaneous use. If you camp in variable weather, that buffer keeps you relaxed instead of checking your battery app every 20 minutes.
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
Apex 300 + B300K
Both survive, but the Apex 300 + B300K finishes at just 35% used. That's enough reserve for a second blackout night. The DELTA 3 Ultra Plus at 63% leaves little margin if the outage runs longer than expected. In storm-prone areas, that remaining capacity is insurance.
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 12% 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
Apex 300 + B300K
The Apex 300 + B300K gives you a comfortable buffer at 19%. Enough to work late, join extra video calls, or charge a second device without worry. The DELTA 3 Ultra Plus at 35% works but leaves less room for the unexpected. For daily remote work, that peace of mind matters.
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 + B300K
Both handle game day, and the Apex 300 + B300K does it with more in reserve — 14% used against 26%. Tailgating is a light load, so that headroom counts for less here than the 72 lbs you'll actually carry across the parking lot.
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 + B300K
The DELTA 3 Ultra Plus needs 179% of its own tank to cover a full van-life day, meaning it can't finish without a mid-day recharge. The Apex 300 + B300K covers the identical day at exactly 100% — no margin, but it gets there.
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 + B300K runs 22.9h vs 12.7h.
$2,599 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 0–313.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–62.7hHigh-Draw Appliances
These reveal the real limitsscale 0–4.7h¹ 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 15, 2026
Verdict: the Apex 300 + B300K, on Power Score margin
The DELTA 3 Ultra Plus is cheaper to own — $0.12 per lifetime kWh against $0.13 — and dramatically lighter and quieter: 77.2 lbs against 148.8, and 30dB against 45dB under load. But the scenario math doesn't split the way the price does. The Apex 300 + B300K wins Weekend Camping, the 8-Hour Blackout, Remote Workday, Tailgate Party, and Van Life Daily outright; the two tie only on CPAP Overnight. Van Life Daily needs 4,685Wh, and the Ultra Plus's 3,072Wh tank covers just 66% of that on its own capacity, needing 179% of its own tank to finish — it simply can't. The Apex covers that same day at exactly 100%. For anyone whose use case is a full day's real draw, that gap outweighs the DELTA 3 Ultra Plus's weight and noise advantages. For lighter, shorter, or quieter-environment use, the Ultra Plus is the smarter buy — see who_should_buy below.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 15, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$2,599.00 list · direct from BLUETTI
or check the DELTA 3 Ultra Plus price$1,499.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 15, 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, Tailgating.
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 3 Ultra Plus rates 4.9/5 (96th percentile of 25 Large-class units), and Apex 300 + B300K rates 4.4/5 (67th percentile of 16 Home Backup-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.
77.2 Pounds Against 148.8
The Ultra Plus is under half the Apex's stacked weight. For anyone moving the unit regularly rather than parking it permanently, that gap decides the matchup on its own.
30 Decibels Against 45
The Apex's 45dB is respectable for a unit this size; the Ultra Plus is simply quieter still, and reviewers compare its fan behavior to EcoFlow's premium DELTA Pro Ultra line even at full output.
Same Five Years, Different Price Tags
Both carry 5-year coverage. The Ultra Plus costs less per warranty year mostly because it costs less to buy — $300 against $520 — not because either warranty runs deeper.
Full record above — the Test Desk pick is the Apex 300 + B300K.
Check Apex 300 + B300K price →or check the DELTA 3 Ultra Plus 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
Both units have similar long-term ownership costs ($0.12/kWh vs $0.13/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off.
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. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also 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 (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
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. Full LFP standardization across lineup (3,500-6,000+ cycles). 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
EcoFlow positions itself as a mid-to-premium brand with stronger support infrastructure, while BLUETTI competes on value. The question is whether the EcoFlow ecosystem and support premium is worth it for your use case.
Growth path
DELTA 3 Ultra Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,072Wh.
Accepts up to 1,600W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Apex 300 + B300K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 5,530Wh.
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 Apex 300 + B300K's higher solar ceiling (2,400W vs 1,600W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Ultra Plus
Reviewers consistently single out how quiet the DELTA 3 Ultra Plus stays under real load — even pushing the inverter toward maximum output, testers describe the fan noise as never becoming annoying or distracting, and compare it favorably to EcoFlow's own premium DELTA Pro Ultra lineA1A2. Build quality gets similar praise: the shell, buttons, and AC cable are described as substantial and durable rather than cheapA8.
The honest catch is weight — testers repeatedly flag it as a genuinely heavy unit for its class at roughly 74-77 lbsA9, and this is a recently launched product, so the available evidence leans on professional review-site testing over long-term owner forum threads. One quirk worth knowing: the unit reportedly shuts down its 30A port first when overloaded, an unusual failure behavior worth understanding before you rely on itA3.
“even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max”
Sources
thesolarlab.com · postperspective.com · appleinsider.com · digitaltrends.com · storagereview.com
BLUETTI Apex 300 + B300K
Reviewers testing heavy household loads on the Apex 300 + B300K report it holding up under sustained real-world draw — one wash cycle took the unit from 100% down to 65% in about an hour, and a heat pump dryer run afterward brought it down to 20% over roughly 90 more minutesB9B10, numbers that track with a system built to replace a generator rather than a phone chargerB4.
As with the DELTA Pro matchup, this bundle is new enough that the evidence is mostly professional test units rather than long-term owner threads, so treat it as early-adopter coverage. The recurring gripe is ports: the base unit has none beyond its AC plugs, and the accessory hub needed to add them runs about $300B1B2.
“The Apex 300 doesn't have USB ports, DC ports, or much of anything beyond its six AC plugs and high-voltage connectors.”
Sources
thesolarlab.com · techspective.net · digitalreviews.net · thesolarpit.com · cleantechnica.com · trustedreviews.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
- Professional reviewers consistently describe the fan noise as very quiet even under heavy load, comparable to EcoFlow's premium DELTA Pro Ultra line. [DELTA 3 Ultra Plus · 3 entries]
- Reviewers report solid UPS/pass-through charging performance with no noticeable switchover issues or output throttling tied to input wattage. [DELTA 3 Ultra Plus · 2 entries]
- The unit's high weight (~74 lbs) and premium MSRP are repeatedly flagged as drawbacks, though discounted street pricing is seen as making the value proposition much stronger. [DELTA 3 Ultra Plus · 3 entries]
- Build quality/durability is praised as substantial and non-fragile across multiple independent reviews. [DELTA 3 Ultra Plus · 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 · 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 · 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 · 4 entries]
- A1
“even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- A2
“we'd probably say the noise it creates is similar to what you hear when you run the DELTA Pro Ultra, which is pretty amazing”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- A3
“One weird thing we noticed was the fact that the unit always seems to shut down the 30A port first when you overload the unit”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [mixed]
- A8
“It does not feel cheap or fragile. Everything from the outer shell case to the plastic buttons and the AC cable feels substantial and durable”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [positive]
- A9
“Weighing in at a thunderous 74 pounds, the Ultra is not considered lightweight by any standards”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [mixed]
- B1
“The Apex 300 doesn't have USB ports, DC ports, or much of anything beyond its six AC plugs and high-voltage connectors.”
thesolarlab.com — Bluetti Apex 300 Review: Cheap, Practical Home Backup? · unknown (2025/2026) · [mixed]
- B2
“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.com — Bluetti Apex 300 Review: Cheap, Practical Home Backup? · unknown (2025/2026) · [negative]
- B4
“It's one of the few systems I've tested that feels like it could genuinely replace a generator, without the noise, fumes, or maintenance.”
techspective.net — Bluetti Apex 300 with B300K Review · 2025-09-21 · [positive]
- B9
“Results: 1 wash took about 1 hour and drained the Apex from 100% down to 65%.”
digitalreviews.net — Bluetti Apex 300 Power Station Tests (Australia) Part II · 2025-09 · [positive]
- B10
“Just for fun we then turned on our heat pump dryer to see that over 1½ hours it would further drain it down to 20%.”
digitalreviews.net — Bluetti Apex 300 Power Station Tests (Australia) Part II · 2025-09 · [mixed]
Research compiled July 15, 2026.
Who Should Buy Which
Buy the DELTA 3 Ultra Plus if you…
- →You need something you can actually carry solo and set up without a cart — 77.2 lbs against the Apex's 148.8.
- →Noise matters where this lives, like a shared living space or a campsite with neighbors — 30dB is close to background-quiet even under load.
Buy the Apex 300 + B300K if you…
- →Your daily draw is a real full day's worth of use, like full-time van life — the Ultra Plus's 3,072Wh tank falls 179% short of covering that on its own.
- →You want the widest scenario coverage from a single unit without adding a second battery.
If neither fits
If the actual job is a phone, a laptop, and maybe a fan for a weekend, both of these are far more unit than needed at this price point — a sub-$500 station from either brand's smaller lineup covers it.
The Bottom Line
The DELTA 3 Ultra Plus wins on everything you feel every time you move it: less than half the weight, 15dB quieter, and a cent cheaper per lifetime kWh. What it doesn't win is the scenario that actually stresses a power station — Van Life Daily, where its tank falls short by 179% of its own capacity.
If the daily job fits inside 3,072Wh, take the Ultra Plus and enjoy carrying 71.6 fewer pounds. If it doesn't, the Apex 300 + B300K is the one that finishes the day.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
DELTA 3 Ultra Plus or Apex 300 + B300K — which is the better buy?
It depends on how much energy a real day of use actually requires. The Ultra Plus is lighter, quieter, and cheaper to own per kWh, but it can't finish a full van-life day (needing 179% of its own tank), where the Apex covers the same day at exactly 100%. Under that threshold, the Ultra Plus is the better buy.
Which one is quieter?
The DELTA 3 Ultra Plus, rated at 30dB under load against the Apex's 45dB. Reviewers describe the Ultra Plus's fan noise as comparable to EcoFlow's premium DELTA Pro Ultra line even at maximum output.
Can the DELTA 3 Ultra Plus handle a full day of van life?
Not on a single charge. A full van-life day needs about 4,685Wh; the Ultra Plus's 3,072Wh tank needs 179% of its own capacity to cover that, meaning a mid-day recharge is required. The Apex 300 + B300K covers the same day at exactly 100%.
Is the Apex 300 + B300K worth carrying given how much heavier it is?
Only if the job needs the extra tank. It weighs 148.8 lbs stacked against the Ultra Plus's 77.2, nearly double, and that extra weight is what buys the 2,457.6Wh capacity gap that lets it cover Van Life Daily where the Ultra Plus can't.
Which is cheaper to own over its lifetime?
The DELTA 3 Ultra Plus, at $0.12 per lifetime kWh against $0.13 for the Apex, and $300 per warranty year against $520. It's a real but small edge — not large enough to outweigh the scenario coverage gap for heavier daily loads.
Where to buy
EcoFlow DELTA 3 Ultra Plus
$1,499.00
$1,499.00 list · direct from EcoFlow
BLUETTI Apex 300 + B300KPick
$2,599.00
$2,599.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.