Head-to-head test
EcoFlow DELTA Pro 3 vs BLUETTI Apex 300
The Apex 300 is $1,400 cheaper and has the better surge ratio for hard-starting compressors, but the DELTA Pro 3 carries 1,331Wh more energy in a body that's 60.6 lbs lighter and 15dB quieter — for anyone who has to move this thing or sleep near it, that combination beats a lower price tag.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
EcoFlow
DELTA Pro 3
5,693Power Score · The AC & Fridge Zone
$2,399.00 list · direct from EcoFlow
BLUETTI
Apex 300
5,062Power Score · The AC & Fridge Zone
$1,699.00 list · direct from BLUETTI
Spec deltas
The EcoFlow DELTA Pro 3 costs $3,199 and holds 4,096Wh; the BLUETTI Apex 300 costs $1,799 and holds 2,764.8Wh. That $1,400 and 1,331Wh gap is the headline, but it's not the whole story — the Apex 300 also weighs 173 lbs against the DELTA Pro 3's 112.4 lbs, which means the smaller battery is the heavier box.
Both are expandable, both carry 5-year warranties, and both run near-identical costs per lifetime kilowatt-hour once you do the arithmetic ($0.20 versus $0.19). Where they actually split is capacity headroom and handling: the DELTA Pro 3 finishes nearly every scenario with more tank left, while the Apex 300 answers back with a stronger surge ratio and a genuinely lower per-year ownership cost.
If you're optimizing for the smallest possible check and don't mind the extra weight, the Apex 300 is the rational buy. If you want a unit that's lighter than its rival despite holding more energy, and quieter while it does it, that's the DELTA Pro 3.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Worked as energy density, that's roughly 36 Wh per pound for the DELTA Pro 3 against roughly 16 Wh per pound for the Apex 300 — more than double. Whatever's inside the Apex 300's chassis besides battery cells, it isn't buying capacity.
DELTA Pro 3 holds 4,096Wh and weighs 112.4 lbsApex 300 holds 2,764.8Wh and weighs 173 lbs
Why it mattersAnyone who has to lift this rather than roll it into a permanent spot should treat the DELTA Pro 3's lighter weight as a bigger deal than its higher price suggests.
continuous output
That surge cushion arrives paired with a noisier unit — 45dB under load against the DELTA Pro 3's 30dB, a 15dB gap that's the difference between background hum and something you notice across a room.
Apex 300 surges to 7,680W against 3,840W continuous — a 2.0x ratioDELTA Pro 3 surges to 6,000W against 4,000W continuous — a 1.5x ratio
Why it mattersFor a fixed, detached installation running compressor loads, the Apex 300's surge margin can matter more than its fan noise; for anything indoors or near living space, that math flips.
That reserve is what absorbs the outage that runs a day longer than planned or the camping trip where someone forgets to switch off a space heater; the Apex 300 has far less room to absorb the same surprise.
Weekend Camping needs 2,100Wh: DELTA Pro 3 uses 60% of capacity, Apex 300 uses 89%8-Hour Blackout needs 1,645Wh: DELTA Pro 3 uses 47%, Apex 300 uses 70%
Why it mattersBuyers whose trips or outages could plausibly run past the modeled numbers should value the DELTA Pro 3's buffer over the Apex 300's lower sticker price.
But that's only true if you use the extra 1,331Wh. Priced per year of warranty coverage instead, the DELTA Pro 3 is genuinely the more expensive unit to hold, at $640 a year against $360.
DELTA Pro 3 costs $640 per warranty-year against the Apex 300's $360Both units carry $0.20 and $0.19 per lifetime kWh — a near-tie
Why it mattersBuyers who won't regularly touch the DELTA Pro 3's extra capacity are better off banking the $1,400 and taking the Apex 300; buyers who will use it are paying for headroom, not for a worse deal.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: DELTA Pro 3 wins four of six modeled scenarios by a wide capacity margin — the clearest decision driver.
CPAP Overnight is the one true tie: both units use under 15% of capacity, so there's no power reason to pay more for that job alone. Everywhere else the DELTA Pro 3 pulls ahead, and Van Life Daily defeats both units outright at 135% and 199% of the 4,685Wh required — neither is sized for that job.
The pattern across the scenarios that do split is consistent: the DELTA Pro 3 finishes with meaningfully more capacity in reserve, not a narrow edge. That's the case for treating this as a headroom purchase rather than a per-scenario coin flip.
Portability & Form Factor
Selected because: Apex 300 is the heavier unit despite less capacity — a genuine surprise worth explaining.
weight
A 173-lb unit isn't something you carry solo across a campsite; it's something you park once and leave. The DELTA Pro 3 at 112.4 lbs is still a two-person lift over a tailgate, but it's the meaningfully lighter option carrying the bigger battery.
Fan noise tracks the same direction. The Apex 300 runs 45dB under load against the DELTA Pro 3's 30dB, a gap that shows up as audible hum in a quiet room during charging. If either unit is going to sit near where people sleep or work, that 15dB matters as much as the weight does.
Lifetime Value
Selected because: Near-identical cost per lifetime kWh but a real gap in cost per warranty-year — needs to be stated plainly.
cost / lifetime kWh
Run the ownership math to the end of both service lives and the two units land within a cent of each other per kilowatt-hour — $0.20 for the DELTA Pro 3, $0.19 for the Apex 300. The extra $1,400 upfront on the DELTA Pro 3 is nearly paid back by its extra capacity and 500 additional cycles.
Priced per warranty-year instead, the gap reopens: $640 for the DELTA Pro 3 against $360 for the Apex 300, on identical 5-year terms. That's the honest number for anyone not planning to use the full extra 1,331Wh — the Apex 300 is the cheaper unit to hold, full stop.
What the Specs Don't Tell You
Selected because: Surge ratio, noise, and warranty value are the concrete spec-true tiebreakers.
rated cycles
The Apex 300's 2.0x surge ratio (7,680W over 3,840W continuous) beats the DELTA Pro 3's 1.5x (6,000W over 4,000W) — a real inverter-quality edge for starting a fridge or AC compressor cold. It comes bundled with the louder fan noted above, so it reads best as an installed-appliance spec, not a bedroom spec.
Warranty terms are identical at 5 years on both, so the cost-per-warranty-year gap comes entirely from the price difference, not unequal coverage. Neither buyer is getting shorted on protection; one is just paying more for it.
Strengths & trade-offs
EcoFlow DELTA Pro 3
Strengths
- +Larger battery capacity
- +Higher AC output
Trade-offs
- –Substantially more expensive (+$700) than the Apex 300.
- –Significantly heavier (+28.6 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI Apex 300
Strengths
- +Costs $700 less
- +Lighter by 28.6 lb
- +Faster solar charging
Trade-offs
- –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
DELTA Pro 3
The Apex 300 cuts it close at 89%. One cold night or an unexpected device and you're rationing power. The DELTA Pro 3 finishes at 60%, 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
DELTA Pro 3
Both survive, but the DELTA Pro 3 finishes at just 47% used. That's enough reserve for a second blackout night. The Apex 300 at 70% 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 14% 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
DELTA Pro 3
The DELTA Pro 3 gives you a comfortable buffer at 26%. Enough to work late, join extra video calls, or charge a second device without worry. The Apex 300 at 39% 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
DELTA Pro 3
Both handle game day, and the DELTA Pro 3 does it with more in reserve — 19% used against 29%. Tailgating is a light load, so that headroom counts for less here than the 29 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
Neither unit
Neither unit can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
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: DELTA Pro 3 runs 17h vs 11.5h.
$2,399 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 0–232.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–46.4hHigh-Draw Appliances
These reveal the real limitsscale 0–3.5h¹ 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 DELTA Pro 3, on Power Score margin
Say this plainly first: the Apex 300 is the cheaper unit to own by the engine's own math, at $0.19 per lifetime kWh and $360 a warranty-year against the DELTA Pro 3's $0.20 and $640. If pure ownership economics is the whole question, take the Apex 300 and keep the $1,400. But the DELTA Pro 3 wins on every scenario it doesn't tie, finishing Weekend Camping at 60% of capacity used against the Apex 300's 89%, and it does that while weighing 60.6 lbs less and running 15dB quieter. A unit you might actually carry, and one that leaves real headroom in an outage, is worth the premium for most buyers here.
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.
$2,399.00 list · direct from EcoFlow
or check the Apex 300 price$1,699.00 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.
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 3 rates 4.1/5 (47th percentile of 16 Home Backup-class units), and Apex 300 rates 4.9/5 (92nd percentile of 25 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.
The Smaller Battery Is the Heavier Box
The Apex 300 weighs 173 lbs against the DELTA Pro 3's 112.4 lbs, a 60.6-lb gap, despite holding 1,331Wh less capacity. This is a park-it-once unit, not a grab-and-go one.
15 Decibels Under Load
The Apex 300 runs at 45dB under load against the DELTA Pro 3's 30dB. Noticeable in a quiet room during charging, less relevant if the unit lives outside or in a garage.
Apex 300's Bigger Surge Cushion
7,680W surge against 3,840W continuous is a 2.0x ratio, ahead of the DELTA Pro 3's 1.5x (6,000W over 4,000W continuous). That extra margin matters most for hard-starting compressors.
Full record above — the Test Desk pick is the DELTA Pro 3.
Check DELTA Pro 3 price →or check the Apex 300 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 is cheaper to buy, but the DELTA Pro 3 is cheaper to own. At $0.15/kWh over its lifetime vs $0.18/kWh, the DELTA Pro 3's higher cycle life and capacity make each dollar go further over the years.
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 Pro 3
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 4,096Wh.
Accepts up to 2,000W 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
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, so neither locks you out of growth — decide on capacity, price, and the rest, not the expansion checkbox.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA Pro 3
The DELTA Pro 3 has a track record behind it. Reviewers call it a gold-standard whole-home backup unit for 2026, citing the 4,096Wh LFP pack, 4,000W dual-voltage output, and 6,000W surge via X-BoostA1A4. The charging story draws specific praise: multi-charge tech reaches 0-80% in about 50 minutes on up to 7,000W input, with a full charge around 90 minutesA3.
The weight, at roughly 113.5 lbs, is acknowledged by reviewers as real but not disqualifying for a unit in this capacity classA4 — consistent with the lighter-than-expected number this page keeps returning to.
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
Sources
ecoflow.com · amazon.com · homedepot.com · thepowerpick.com · outboundpower.com · techradar.com · thesolarlab.com
BLUETTI Apex 300
The Apex 300 is new enough that independent long-term owner data barely exists yet; most of what's available is press review coverage plus a handful of posts on BLUETTI's own community forum, so treat this as thin and early. What's there is a mixed picture: reviewers say its fans are relatively tame compared to units that sound like small jet engines under loadB5, and the handles help make the 173-lb weight manageable even though one reviewer said they could barely carry it a few feet or lift it onto a tableB6B8.
Firmware has been the recurring irritant — multiple community-forum posts describe updates locking the unit into Backup mode, throwing Error 004 mid-charge, or breaking Bluetooth/Home Assistant connectionsB1B2B3B4. Reviewers also flag that the Apex 300 skips built-in USB/DC ports on its face, pushing buyers toward a $300 Hub D1 accessory just to get them backB7B11.
“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
- Huge 4,096Wh LFP capacity, 4,000W dual-voltage output, very fast charging, and big expandability are the standout praise; it's heavy at ~113 lbs. [DELTA Pro 3 · 2 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
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
ecoflow.com / amazon.com — DELTA Pro 3 · 2026 · [positive]
- A3
“Multi-charge technology reaches 0-80% in about 50 minutes using up to 7,000W input, with a full charge in roughly 90 minutes; up to 2,600W solar.”
outboundpower.com / techradar.com — DELTA Pro 3 review · 2026 · [positive]
- A4
“Weighs about 113.5 lbs; reviewers call it a gold-standard whole-home backup unit for 2026.”
techradar.com / thesolarlab.com — DELTA Pro 3 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]
- 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]
Research compiled July 15, 2026.
Who Should Buy Which
Buy the DELTA Pro 3 if you…
- →You need real headroom for an unpredictable outage or a multi-day trip — the DELTA Pro 3 finishes Weekend Camping and the 8-Hour Blackout scenarios with roughly half its tank still full.
- →You have to physically move this unit and want the lighter, quieter option even though it's the pricier one.
Buy the Apex 300 if you…
- →You're optimizing for the lowest cost per year of ownership and don't plan to use the DELTA Pro 3's extra 1,331Wh — the Apex 300 is $360 a warranty-year against $640.
- →This is going into a fixed, detached spot where 45dB and 173 lbs of dead weight don't matter, and you want the stronger 2.0x surge ratio for a compressor-heavy load.
If neither fits
Van Life Daily needs 4,685Wh and both units fall short — the DELTA Pro 3 hits 135% of what's required and the Apex 300 hits 199%. Anyone planning full-time van or off-grid living should look at larger expandable configurations from either brand rather than choosing between these two base units.
The Bottom Line
The Apex 300 is the cheaper unit to own by every lifetime-cost measure the engine computes, and it has the better surge ratio for hard-starting appliances. But the DELTA Pro 3 answers with more capacity in a lighter, quieter package — 1,331Wh more energy at 60.6 fewer pounds and 15 fewer decibels — and it turns that into a real headroom advantage across four of six modeled scenarios.
Buy the Apex 300 if the goal is the smallest check and the unit lives somewhere permanent. Buy the DELTA Pro 3 if you want the unit that's easier to move and leaves more capacity in reserve when the outage runs longer than planned.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the BLUETTI Apex 300 actually cheaper to own than the EcoFlow DELTA Pro 3?
Yes, by the engine's lifetime math: $0.19 per lifetime kWh and $360 per warranty-year for the Apex 300, against $0.20 and $640 for the DELTA Pro 3. The two are nearly tied on cost per kWh delivered, but the DELTA Pro 3's higher sticker price makes it the more expensive unit to hold year over year.
Why does the Apex 300 weigh more than the DELTA Pro 3 despite a smaller battery?
The Apex 300 weighs 173 lbs against the DELTA Pro 3's 112.4 lbs while holding 1,331Wh less capacity, working out to roughly 16 Wh per pound versus 36 Wh per pound. The extra weight isn't buying energy density — it's a heavier chassis around a smaller pack.
Which one handles a fridge or AC startup better?
The Apex 300 has the stronger surge ratio: 7,680W surge against 3,840W continuous output, a 2.0x margin versus the DELTA Pro 3's 1.5x (6,000W over 4,000W). That extra headroom is a genuine advantage for hard-starting compressor loads, though it comes with a louder unit at 45dB under load.
Which one is quieter?
The DELTA Pro 3, by 15dB under load — 30dB against the Apex 300's 45dB. That's the difference between a unit you can sit near while it charges and one you'll notice from across a quiet room.
Which should I buy if I might need to expand later?
Either works — both are expandable, and neither locks you out of growing capacity later. Pick between them on today's headroom, weight, and price rather than future expansion, since that factor doesn't separate them.
Where to buy
EcoFlow DELTA Pro 3Pick
$2,399.00
$2,399.00 list · direct from EcoFlow
BLUETTI Apex 300
$1,699.00
$1,699.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.