Head-to-head test
EcoFlow DELTA Pro 3 vs BLUETTI Apex 300 + B300K
The DELTA Pro 3 costs $200 less than the Apex 300 + B300K, but the Apex build is the only one of the two that finishes a full van-life day — the DELTA Pro 3 would need 35 percentage points more capacity than it has (135% needed against 100% available) to do the same job.
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 + B300K
6,552Power Score · The AC & Fridge Zone
$2,599.00 list · direct from BLUETTI
Spec deltas
At $2,399, the DELTA Pro 3 is now $200 cheaper than the Apex 300 + B300K's $2,599. For the first time in this matchup, the smaller unit is also the cheaper one.
It's still the smaller one, though. The Apex build holds 5,529.6Wh against the DELTA Pro 3's 4,096Wh — 35% more capacity (5,529.6 divided by 4,096) — and that gap is why it wins every scenario where the two actually diverge, right up to a modeled 24-hour van-life day. The DELTA Pro 3 would need 135% of its own usable capacity to finish that day. It can't. The Apex + B300K clears the identical load at exactly 100%, nothing left over, nothing missing either.
That extra capacity didn't come from a smarter battery. It came from a second one. The Apex 300 + B300K is a base station stacked with a bolted-on expansion battery, bundled at one price; the DELTA Pro 3 is a single 112.4 lb box doing the same job alone. Buy the stack and you're moving 148.8 lbs of hardware — not one bigger battery, but two batteries sharing a single price tag.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Spend the extra $200 on the Apex build and every watt-hour of storage costs less: $0.47 against $0.59, about 20% cheaper (0.12 divided by 0.59). The DELTA Pro 3's lower sticker price buys less battery for the money, not more.
DELTA Pro 3 is $2,399 for 4,096Wh, or $0.59 per watt-hourApex 300 + B300K is $2,599 for 5,529.6Wh, or $0.47 per watt-hourthe Apex build costs $200 more upfront but 12 cents less per watt-hour (0.59 minus 0.47)
Why it mattersA buyer comparing sticker prices alone would pick the DELTA Pro 3 and, without realizing it, pay more per watt-hour for the privilege.
A DELTA Pro 3 owner living out of a van full-time isn't looking at an inconvenience — they're 35 percentage points short (135% minus 100%) on day one, and expansion stops being optional. The Apex + B300K's 100% is a pass with nothing to spare, but it's a pass without spending another dollar.
a modeled 24-hour van-life day needs 135% of the DELTA Pro 3's usable capacity, more than it hasthe Apex 300 + B300K covers the identical day at exactly 100% of its usable capacityboth units are expandable, so the DELTA Pro 3 could add a battery to close the gap
Why it mattersAnyone planning to live in the vehicle full-time should budget a DELTA Pro 3 expansion battery on top of its $2,399, or start with the Apex build instead.
weight
148.8 lbs of stacked lithium isn't a bigger single box — it's two boxes bundled at one price, and the DELTA Pro 3 stays the one-piece unit a single person has a real shot at moving alone. That's a genuine cost for the extra capacity, not a rounding error.
the DELTA Pro 3 is a single 112.4 lb unitthe Apex 300 + B300K combines a base station and a bolted-on expansion battery into 148.8 lbs148.8 lbs is 36.4 lbs more than 112.4 lbs, about 32% heavier (36.4 divided by 112.4)
Why it mattersAnyone without help moving this, or without space to store two stacked units, should weigh that against the capacity gap before buying the Apex build.
continuous output
Fifteen decibels is a difference you'd notice every night, not just on a spec sheet — the DELTA Pro 3's clearest edge. The Apex build answers with a 2x surge ratio against the DELTA Pro 3's 1.5x, more room to swallow the spike a fridge or AC compressor throws at the inverter on startup. Neither number shows up if you only read the continuous-watt rating.
the DELTA Pro 3 runs at 30dB under load; the Apex 300 + B300K runs at 45dB, a 15dB gapthe Apex + B300K's surge rating is 7,680W against 3,840W continuous, a 2x ratio; the DELTA Pro 3's is 6,000W against 4,000W continuous, a 1.5x ratiocompressor loads like fridges and AC units routinely surge 2-3x their rated draw at startup
Why it mattersBuyers running compressor-based appliances should weigh the surge ratio; buyers sleeping or working near the unit should weigh the noise gap — and the two pull toward different units.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: Price flipped in the DELTA Pro 3's favor, but cost-per-watt-hour and cost-per-lifetime-kWh both still favor the Apex build — the core tension of this rewrite.
cost / lifetime kWh
The DELTA Pro 3 is cheaper to buy — $2,399 against $2,599 — but the Apex 300 + B300K is cheaper to own. At $0.47 per watt-hour against $0.59, and $0.13 per lifetime kilowatt-hour against $0.15, every dollar spent on the Apex build buys more energy, both today and over its working life.
The DELTA Pro 3 does last more cycles: 4,000 against the Apex build's 3,500 — 500 more (4,000 minus 3,500), about 14% more (500 divided by 3,500) — roughly 11 years of daily use against 9.6. That's a real edge in service life, just not a big enough one to close a capacity gap this size; the Apex build's extra 1,433.6Wh (5,529.6 minus 4,096) outweighs 500 more cycles on a smaller battery.
Your Life, Your Pick
Selected because: Van Life Daily is the one scenario that turns the capacity gap into a hard pass/fail; the rest are margin calls.
At lighter loads, both handle the job. An 8-hour blackout uses 47% of the DELTA Pro 3's capacity and 35% of the Apex build's; a weekend of camping, 60% and 45%. Neither struggles, though the Apex build always finishes with more left in the tank.
Van Life Daily is where headroom turns into a hard limit. The modeled day needs 135% of the DELTA Pro 3's usable capacity — more than it has — while the Apex + B300K clears it at exactly 100%. CPAP Overnight, Remote Workday, and Tailgate Party don't move the needle either way: both units use between 7% and 26% of their capacity across those three loads and finish comfortably, so let price and the numbers above decide those instead.
Portability & Form Factor
Selected because: The Apex build's extra capacity comes bundled with a two-piece stack, not a single denser battery — worth its own look, not just a weight line.
weight
The Apex build's extra capacity comes with a catch the raw spec sheet buries: it isn't a bigger battery, it's two of them. The Apex 300 base station and its bolted-on B300K expansion pack combine for 148.8 lbs, bundled at one price; the DELTA Pro 3 does the same job as a single 112.4 lb box — 36.4 lbs less hardware (148.8 minus 112.4), about 32% lighter (36.4 divided by 112.4).
Both are past a casual one-person lift regardless, but a single box and a two-piece stack are different problems when you're loading a trunk or a van — one item to carry against two, one footprint against two. If storage space or a single lift matters as much as raw capacity, that's the DELTA Pro 3's strongest case.
What the Specs Don't Tell You
Selected because: Noise and surge ratio are the DELTA Pro 3's and Apex build's real, opposite advantages.
rated cycles
Two specs cut in opposite directions. The DELTA Pro 3 runs at 30dB under load against the Apex build's 45dB — a 15dB gap that's genuinely audible for anyone sleeping or working near the unit. The Apex + B300K answers with the stronger inverter: a 2x surge ratio (7,680W against 3,840W continuous) against the DELTA Pro 3's 1.5x (6,000W against 4,000W continuous).
That matters the moment a fridge or AC compressor kicks on, since those loads routinely surge 2-3x their rated draw at startup — headroom the DELTA Pro 3 has less of. Pick a priority: quiet, or a bigger startup cushion. Neither gotcha here is free.
Brand Trust
Selected because: Cross-brand pair — EcoFlow's ecosystem and BLUETTI's value/support tradeoffs differ meaningfully.
EcoFlow runs the larger ecosystem and the more active community, and its charging technology is a genuine differentiator elsewhere in its lineup — though none of that shows up in this pair's price or capacity numbers. BLUETTI counters with the stronger value proposition across its own lineup, the trait actually driving this matchup.
Support is the honest wildcard on both sides. EcoFlow's experience is polarized between smooth prepaid-label swaps and long refurbished-unit waits; BLUETTI leans on email support with China-timezone delays and similarly mixed outcomes. Neither brand is a clear winner on service, so buying direct or through a retailer with its own return policy is the safer hedge either way.
Strengths & trade-offs
EcoFlow DELTA Pro 3
Strengths
- +Costs $200 less
- +Lighter by 36.4 lb
- +Higher AC output
Trade-offs
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI Apex 300 + B300K
Strengths
- +Larger battery capacity
- +Faster solar charging
Trade-offs
- –Significantly heavier (+36.4 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
Both handle a weekend of camping easily — the DELTA Pro 3 uses 60% of its capacity, the Apex + B300K just 45%. The Apex build wins on headroom, but the DELTA Pro 3 is now the cheaper unit for the same trip, so weigh the extra margin against the $200 saved.
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
An 8-hour blackout uses 47% of the DELTA Pro 3's capacity and 35% of the Apex build's. The Apex + B300K's bigger margin matters more the longer an outage runs — but for a single overnight, the DELTA Pro 3's lower price is a fair trade for less headroom.
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
Either unit swallows a CPAP's overnight draw without noticing — 9% of the DELTA Pro 3's capacity, 7% of the Apex build's. This one's a genuine tie on power. Break it on noise instead: at 30dB against 45dB, the DELTA Pro 3 is the one you won't hear at 2 a.m.
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
A remote workday draws 26% of the DELTA Pro 3's capacity and 19% of the Apex build's — another comfortable pass for both. With power to spare either way, this one comes down to price: the DELTA Pro 3's $200 lower cost is the tiebreaker.
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
A tailgate's power draw is light work for either unit — 19% of the DELTA Pro 3's capacity, 14% of the Apex build's. Neither will strand you mid-party, so break this one on weight instead: the DELTA Pro 3's single 112.4 lb box is the easier one to load solo.
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
This is the scenario that actually separates them. A modeled 24-hour van-life day needs 135% of the DELTA Pro 3's usable capacity — it can't finish the day — while the Apex + B300K clears the identical load at exactly 100%, a real pass with nothing left over. If this is your daily reality, the extra weight and price are the cost of admission.
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 17h.
$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 26, 2026
Verdict: the BLUETTI Apex 300 + B300K
Buy the Apex 300 + B300K if you need real capacity. It costs $0.47 per watt-hour of storage against the DELTA Pro 3's $0.59 (a 12-cent gap, 0.59 minus 0.47, about 20% cheaper storage when you divide 0.12 by 0.59), works out to $0.13 per lifetime kWh against $0.15, and it's the only one of these two that clears a modeled 24-hour van-life day — needing exactly 100% of its usable capacity where the DELTA Pro 3 needs 135% and can't finish. It also wins Weekend Camping and the 8-Hour Blackout scenario, using less of its capacity to do it (45% and 35%, against the DELTA Pro 3's 60% and 47%). But the Apex build gets there by being a two-piece stack — a base station plus a bolted-on expansion battery — weighing 148.8 lbs against the DELTA Pro 3's single 112.4 lb box, and it runs 15dB louder under load (45dB against 30dB). If your loads are lighter, if quiet matters more than raw capacity, or if you'd rather move one box than two, the DELTA Pro 3 is now the cheaper unit too, at $2,399 against $2,599 — take it and don't apologize for it.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 26, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$2,599.00 list · direct from BLUETTI
or check the DELTA Pro 3 price$2,399.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 26, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): RV Living.
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 + 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.
Two Boxes, Not One
The Apex build's extra capacity is real, but so is the extra hardware: 148.8 lbs split across a base station and a bolted-on expansion battery, against the DELTA Pro 3's single 112.4 lb unit. Budget for moving two pieces, not one bigger one.
45dB Under Load
The Apex + B300K runs 15dB louder than the DELTA Pro 3 under load — 45dB against 30dB, a gap you'll hear every night near a bedroom or office. It's the DELTA Pro 3's clearest honest advantage.
More Headroom for a Hard Start
The Apex + B300K's inverter surges to 2x its continuous rating (7,680W over 3,840W); the DELTA Pro 3 surges to 1.5x (6,000W over 4,000W). Compressor loads like fridges and AC units routinely spike 2-3x their rated draw at startup, so the Apex build has more room to absorb that spike without tripping.
Full record above — the Test Desk pick is the Apex 300 + B300K.
Check Apex 300 + B300K price →or check the DELTA Pro 3 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 DELTA Pro 3 is cheaper to buy, but the Apex 300 + B300K is cheaper to own. At $0.13/kWh over its lifetime vs $0.15/kWh, the Apex 300 + B300K's higher cycle life and capacity make each dollar go further over the years.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 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
EcoFlow's ecosystem is the broadest in the category, and its fast-charging tech is a genuine edge elsewhere in the lineup.
Worth knowing
None of that shows up in this specific matchup's price or capacity numbers — the DELTA Pro 3 is still the smaller, pricier-per-watt-hour unit here.
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
BLUETTI's strongest card across its lineup is capacity-to-price value, and that's exactly what's driving this matchup — more energy for less per watt-hour.
Worth knowing
Support is the honest risk to weigh against the savings — it's the most inconsistent in the category, heavily email-based with timezone delays.
Analyst note
Both brands run polarized support experiences. The real differentiator on this page is the hardware itself — a single unit against a two-piece stack — not either brand's reputation.
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 + 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, 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
Coverage on the DELTA Pro 3 leans on professional review outlets rather than a mature owner community — this is a newer flagship. Reviewers highlight the 4,096Wh LiFePO4 cell rated for 4,000-plus cyclesA2, the multi-charge tech that reaches 0-80% in about 50 minutes on up to 7,000W of inputA3, and call it a gold-standard whole-home backup pick for 2026A4.
That's first-impression testing, not months of ownership, so treat the positive read as accurate but early — there's no long-term fan-noise or idle-drain data yet to confirm or contradict it.
“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 + B300K
Field reports on the Apex 300 + B300K also lean toward professional test units rather than long-term ownership, since the platform is new. Reviewers running it under real loads are impressed: one wash cycle drained a unit from 100% to 65%B9, a heat-pump dryer took it further to 20%B10, and one reviewer called it among the few systems that could genuinely replace a generator without the noise or fumesB4. Recharge speed drew similar praise — one reviewer called it 'astonishing' to have the system ready again in under an hourB12.
The recurring catch is the stripped-down base station: reviewers flag it shipping with no USB or DC ports beyond its AC outletsB1, pushing buyers toward a roughly $300 accessory hub for basic connectivityB2, and one B300K owner reported getting only a measly 8W out of its charging portB6. Multiple reviewers also flag the sheer bulk of the stacked build as barely one-person-portableB5B14 — the same stack-versus-single-unit tradeoff that shows up in the spec sheet.
“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
- 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]
- 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]
- A2
“LiFePO4 rated for 4,000+ cycles to 80% (10+ years), with an IP65 battery rating.”
homedepot.com / thepowerpick.com — DELTA Pro 3 review · 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
“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]
- B5
“Stacked, you're near 150 pounds of lithium iron phosphate and inverter muscle—movable with the built-in handles or a trolley... but not something you'll casually lug to a picnic.”
techspective.net — Bluetti Apex 300 with B300K Review · 2025-09-21 · [mixed]
- B6
“I just wonder why Bluetti did not include a USB-C port with some decent output, like 100 or 140W as I only got a measly 8W charge out of it for my phone.”
digitalreviews.net — Bluetti B300K Expansion Battery Review · 2025-12 · [negative]
- 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]
- B12
“During my testing, the recharge speed was astonishing. In under an hour, I had a system ready to go again.”
thesolarpit.com — Bluetti Apex 300 Review · 2025-10-28 · [positive]
- B14
“As will you: it weighs in at 38kg, and is probably much too big and heavy for most people to carry alone.”
trustedreviews.com — Bluetti Apex 300 Review · 2025-10-10 · [negative]
Research compiled July 26, 2026.
Who Should Buy Which
Buy the DELTA Pro 3 if you…
- →You want the cheaper unit today — $2,399 against the Apex build's $2,599 — and your loads don't require the extra capacity.
- →Quiet matters: 30dB against the Apex build's 45dB is a difference you'll hear every night near a bedroom or office.
- →You want one box, not two — a single 112.4 lb unit instead of a stacked 148.8 lb system.
Buy the Apex 300 + B300K if you…
- →You want more capacity for the money: $0.47 per watt-hour against $0.59, and $0.13 per lifetime kWh against $0.15.
- →You're running this as a full-time van-life setup: it clears a modeled 24-hour day at exactly 100% of its usable capacity, where the DELTA Pro 3 needs 135% and can't.
- →You're running compressor-based appliances and want the stronger 2x surge ratio for startup loads.
If neither fits
If your loads are modest — an occasional weekend trip or a short blackout — both of these oversize the job and the price. A smaller 2,000-3,000Wh unit from either brand covers those cases for meaningfully less money and a lot less weight to haul around.
The Bottom Line
Buy the Apex 300 + B300K if you need the capacity. It costs $0.47 per watt-hour against the DELTA Pro 3's $0.59, $0.13 per lifetime kWh against $0.15, and it's the only one of these two that finishes a full 24-hour van-life day — the DELTA Pro 3 would need 135% of its own usable capacity to do the same job.
The DELTA Pro 3 earns its case in three honest places: it's $200 cheaper today, it runs 15dB quieter, and it's a single 112.4 lb box instead of a stacked 148.8 lb system. If none of those three outweigh the capacity gap for you, the Apex build is the better battery, full stop. If any one of them does, the DELTA Pro 3 is $200 cheaper for exactly the reasons you'd want it to be — take it.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
DELTA Pro 3 or Apex 300 + B300K — which is cheaper?
The DELTA Pro 3, by sticker price: $2,399 against the Apex build's $2,599, a $200 gap. But the Apex + B300K is the better deal per watt-hour of storage — $0.47 against $0.59 — and per lifetime kilowatt-hour delivered — $0.13 against $0.15. If you need the extra capacity, the Apex build is worth the $200; if you don't, the DELTA Pro 3 is now the cheaper unit outright.
Can the DELTA Pro 3 run a van full-time?
Not on its own. A modeled 24-hour van-life day needs 135% of its usable capacity — more than the unit has — so it would need an expansion battery from day one. The Apex 300 + B300K covers the identical day at exactly 100%, no extra purchase required.
Why does the Apex 300 + B300K weigh so much more?
Because it's two units, not one. The Apex 300 base station and its bolted-on B300K expansion battery combine for 148.8 lbs, against the DELTA Pro 3's single 112.4 lb box — about 32% more hardware (36.4 lbs divided by 112.4) for the extra 1,433.6Wh of capacity (5,529.6 minus 4,096).
Is the DELTA Pro 3 worth it for the quieter operation?
If noise near a bedroom or office is the priority, yes — 30dB against the Apex build's 45dB is a real, audible 15dB gap. Outside that specific need, the Apex + B300K wins on cost per watt-hour, capacity, and every scenario where the two diverge.
Which handles a fridge or AC compressor better on startup?
The Apex + B300K, on paper. Its surge rating is 2x its continuous output (7,680W over 3,840W), against the DELTA Pro 3's 1.5x (6,000W over 4,000W) — more headroom for the 2-3x startup spikes compressor loads typically draw.
Where to buy
EcoFlow DELTA Pro 3
$2,399.00
$2,399.00 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.