Head-to-head test
EcoFlow DELTA 2 vs BLUETTI Apex 300 + B300K
Forty-nine cents a watt-hour against forty-seven: these are the same battery at two sizes, so the only question that decides anything is whether your day runs past the DELTA 2's 870Wh of usable capacity.
Full profiles: EcoFlow DELTA 2 → · BLUETTI Apex 300 + B300K →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$499.00 · direct from EcoFlow
Last checked 52 days ago. Prices move — check before you buy.
$2,599.00 · direct from BLUETTI
Last checked 3 days ago. Prices move — check before you buy.
Spec deltas
Forty-nine cents a watt-hour for the DELTA 2, forty-seven for the Apex 300 + B300K. That settles the money question before it's asked: nobody is getting a deal here, and the $2,100 between $499 and $2,599 buys watt-hours at the going rate and nothing else.
So the question isn't which one is better engineered. It's how big your day is. The DELTA 2 holds 1,024Wh and the Apex system holds 5,529.6Wh, and four of the six load profiles scored on this page ask for more than the DELTA 2's 870Wh of usable capacity. If yours is one of the other two, you'd be spending $2,100 on headroom you never reach into.
One thing the spec table doesn't say out loud: the Apex 300 + B300K is two boxes. Its 5,529.6Wh divided by the Apex 300's own 2,764.8Wh is exactly two, and the 148.8 lbs on the sheet is the pair stacked. That isn't a unit you carry badly. It's a unit you place once.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
That collapses the comparison into one question no spec table can answer for you: how many watt-hours does your day actually consume? The scored profiles run from a 320Wh CPAP night to a 4,685Wh van-life day, and the DELTA 2's 870Wh of usable capacity sits near the bottom of that range. The Apex doesn't beat the DELTA 2 on engineering. It beats it on being roughly five times the size, and it charges a fair price for that.
DELTA 2: $499 for 1,024Wh, which the data puts at $0.49 per watt-hourApex 300 + B300K: $2,599 for 5,529.6Wh, or $0.47 per watt-hourFour of the six scored load profiles need more than the DELTA 2's 870Wh of usable capacity
Why it mattersAdd up your own watt-hours before you compare another spec. That single number decides this, and nothing else on the page will overturn it.
The same tester then ran a heat-pump dryer and watched the pack fall from 65% to 20%B10, so wash and dry together is 80% of the system. Appliances with heating elements aren't a stretch goal for the DELTA 2, they're outside its category, and no state of charge changes that. This is the line between a box that keeps your devices alive and a box that keeps your house running.
One reviewer's wash cycle took the Apex system from 100% to 65% in about an hourB9The Apex 300 + B300K holds 5,529.6WhThe DELTA 2 holds 1,024Wh
Why it mattersIf a major appliance is the reason you're shopping, the DELTA 2 isn't the cheaper option, it's a different product, and the $2,100 comparison never applies to you.
solar input
That kills the most common reason people talk themselves into the smaller unit for off-grid use. Solar can't rescue a capacity shortfall inside the same day, because you can't harvest into a battery that filled up at 1,024Wh by mid-morning. Panel ceiling is a refill-speed spec. Capacity is the spec that decides whether the day finishes.
DELTA 2 accepts up to 500W of solar into 1,024WhApex 300 + B300K accepts up to 2,400W of solar into 5,529.6WhThe DELTA 2 is 3,815Wh short of the 4,685Wh van-life day
Why it mattersOff-grid buyers should size the battery to the day first and check the solar ceiling is proportional second. Doing it the other way round is how you end up owning panels you can't use.
Strip the decibels out and the CPAP question stops being about the box beside your pillow and becomes about the length of the outage. 870Wh divided by a 320Wh night is two nights and most of a third. 4,700Wh divided by that same 320Wh is fourteen. One of these is a bad-storm kit and the other is a bad-week kit.
The DELTA 2's fans trigger above 120W and run at roughly 48–55dB only at 1,500–1,800W loadsA1The CPAP profile is 320Wh across an eight-hour night, about 40WDELTA 2 usable capacity is 870Wh; the Apex system's is 4,700Wh
Why it mattersCPAP buyers should choose on how long their power realistically stays out and ignore the dB row entirely at this load.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Four of the six standard load profiles ask for more than the DELTA 2's 870Wh of usable capacity, so this section does the sizing for you.
The Apex takes all six, and the sweep is less impressive than it looks: four of them ask for more watt-hours than the DELTA 2 physically has. The two ends are what reward a close read. Remote Workday is a 40Wh loss, 910Wh of demand against 870Wh usable, and that 870 comes from a flat 85% derate applied to every unit on this site rather than a measurement of this one. On its 1,024Wh nameplate, the DELTA 2 does the workday. At the other end, the Apex clears Van Life Daily by 15Wh out of 4,700Wh, which is a pass the way a bus you catch by running is a bus you caught.
One structural caveat about this whole section: the scoring model has no class for an installed system. Weekend Camping and Tailgate Party assume the unit got itself to the event, and they reward the lighter box for it. A 148.8 lb two-box stack can win both on watt-hours and still be the wrong thing to own for a campsite. Read the six results as a sizing exercise, not a portability verdict. Portability is a separate question and it gets its own section.
Runtime: Will It Power Your Gear?
Selected because: 1,024Wh against 5,529.6Wh is the gap everything else on this page descends from, and runtime is where it becomes a number you can plan around.
continuous output
1,024Wh against 5,529.6Wh is the ratio to hold in your head, and the derated versions are the ones to plan with: 870Wh and 4,700Wh after the flat 85% factor this site applies to both. Nothing else here reorders those two numbers.
The useful operation is division. A 1,645Wh eight-hour outage doesn't fit inside 870Wh at all, and fits into 4,700Wh nearly three times over. The same storm is a candle-lighting evening for one box and an unremarkable Tuesday for the other. Scale that to the three-day outage that actually costs people a freezer full of food, and the gap stops being a spec and becomes the entire reason the larger system exists.
Portability & Form Factor
Selected because: 27 lbs against a 148.8 lb system that arrives as two boxes, which changes where each one can realistically live.
weight
Twenty-seven pounds is a one-hand-on-the-handle, other-hand-on-the-tailgate lift. The DELTA 2 goes in a trunk without you thinking about it, and that ease is most of what it's for.
The Apex 300 + B300K is not a heavier version of that thing. It's two boxes: 5,529.6Wh divided by the Apex 300's own 2,764.8Wh is exactly two, and the 148.8 lbs on the spec line is the stack, not an object. That turns the question from whether you can lift it into where it lives. Pick a spot near the panels or near the gear it backs up, on a floor you're happy to give up, and expect to move it roughly never. The right mental model isn't a bigger power station. It's an appliance that happens to have handles.
What the Specs Don't Tell You
Selected because: The DELTA 2 tops out at 1,800W continuous and 2,700W surge against 3,840W and 7,680W, and appliance startup is where that ceiling shows up.
rated cycles
The inverter gap is the one with teeth. 1,800W continuous with 2,700W of surge against 3,840W and 7,680W isn't a bragging-rights difference. A 1.5x surge ratio against 2x is roughly the margin that decides whether a motor spins up or the unit trips, and anything with a compressor is where the DELTA 2 finds its ceiling. You find it at startup, not during the run, which is why people are surprised by it.
Fan noise is the DELTA 2's known weak spot, and it's better understood than a single 50dB figure suggests. Reviewers consistently report the fans spinning up above 120W, sounding like a gaming laptop at 1,200W charging, and reaching roughly 48–55dB at full outputA1A2. You can throttle the charge rate in the app to quiet themA2, and EcoFlow has signalled a firmware fixA4, which is a stated intention rather than a shipped one. The practical read: this unit is quiet when it's idling and loud when it's working, and which one you hear is decided by your load, not by the spec sheet.
Lifetime Value
Selected because: Sixteen cents a lifetime kilowatt-hour against thirteen, which is close enough that this table settles nothing.
cost / lifetime kWh
Sixteen cents a lifetime kilowatt-hour against thirteen. That's a real edge to the Apex and a small one, and it's the whole of what this metric can ever measure: 3,000 cycles at $0.49 a watt-hour against 3,500 at $0.47. It will not recover $2,100 for you, and treating it as the reason to spend more is how people talk themselves into a purchase their load never justified.
Ignore the years column while you're in here. It reads 8.2 years for the DELTA 2 and 9.6 for the Apex under daily cycling, which is just 3,000 and 3,500 cycles divided by 365 with no capacity term anywhere in it. Two systems as far apart as 1,024Wh and 5,529.6Wh print nearly the same lifespan, because a cycle means one thing in one box and more than five times as much in the other. The honest version of the durability claim is total energy: 19,354 lifetime kilowatt-hours against 3,072.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Costs $2,100 less
- +Lighter by 121.8 lb
Trade-offs
- –Weaker inverter (-2,040W) limits appliance compatibility.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the Apex 300 + B300K's 6,000, so it wears out sooner.
BLUETTI Apex 300 + B300K
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$2,100) than the DELTA 2.
- –Significantly heavier (+121.8 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
Neither unit
Two thousand one hundred watt-hours across a weekend, against 870Wh of usable capacity in the DELTA 2. It's 1,230Wh short, so it's finished well before Saturday night. The Apex covers the same weekend at 45% used, which is another way of saying the weekend fits twice with room left.
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
Eight hours of house needs 1,645Wh and the DELTA 2 has 870Wh usable, so it covers a bit more than half the outage and then it's candles. The Apex ends the same eight hours at 35% used, and that's the more useful figure, because the outage that actually hurts is the three-day one and only one of these boxes is still awake on day two.
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
Apex 300 + B300K
A CPAP is a 320Wh night. Both units clear that before you've fallen asleep, so the 37% and 7% are a formality. What separates them is how many nights: 870Wh divided by 320Wh is two nights and most of a third, against fourteen for the Apex's 4,700Wh. Buy on how long your power stays out, not on how much fits into one night.
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
Forty watt-hours. That's the entire gap, 910Wh of work against 870Wh usable, and that 870 is a flat 85% derate applied to every unit on this site rather than a measurement of this one. The Apex takes the day outright with 3,790Wh spare, but treat the DELTA 2's loss as a rounding call rather than a failure. Its nameplate is 1,024Wh.
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 2
Both cover game day comfortably, and the Apex takes it on headroom: 14% used against 77%, or 4,030Wh left in reserve against 200Wh. On a 670Wh load, though, that reserve is buying nothing you'll spend before the fourth quarter.
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 Apex finishes this day with 15Wh left out of 4,700Wh usable, which is a pass on paper and a complete daily cycle in practice. Van lifers should read that as the moment you buy the second expansion battery rather than as headroom. The DELTA 2 is 3,815Wh short, which isn't a near miss, it's the wrong size of thing.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: Apex 300 + B300K runs 22.9h vs 4.2h.
$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
August 9, 2026
Verdict: the Apex 300 + B300K, on Power Score margin
Take the Apex 300 + B300K if your daily draw clears the DELTA 2's 870Wh of usable capacity, which four of the six scored load profiles do. It wins every scenario on the board, holds 5,529.6Wh against 1,024Wh, starts harder loads with 3,840W continuous and 7,680W of surge against 1,800W and 2,700W, and costs slightly less per lifetime kilowatt-hour at 13 cents against 16. But it is the right answer conditionally, not generally. It costs $2,100 more than the DELTA 2's $499, it arrives as two boxes totalling 148.8 lbs, and if your real day is a CPAP night or a tailgate, the DELTA 2 finishes both with capacity to spare and leaves you $2,100 for panels.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 9, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$2,599.00 · direct from BLUETTI
Last checked 3 days ago. Prices move — check before you buy.
or check the DELTA 2 price$499.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated August 9, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, RV Living, CPAP, Tailgating, Apartment Balcony, Camping.
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 2 rates 4.1/5 (48th percentile of 26 Everyday-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.
148.8 lbs Is Two Boxes, Not One Lift
The Apex 300 + B300K is a stacked system. Its 5,529.6Wh divided by the Apex 300's own 2,764.8Wh is exactly two units, and 148.8 lbs is the pair together rather than a single object. You move the pieces one at a time, and then you stop moving them. Decide where it lives before it arrives: near the panels, near the gear it backs up, on a floor you're content to give up. Treat it as an appliance with handles rather than a power station you take places.
45dB vs 50dB, and Both Are Load Figures
Five decibels is the narrowest gap on this page, and neither figure describes a unit sitting at low draw. A power station's fan speed tracks what you're pulling out of it, so one rated number is standing in for a whole range of behaviour. If the unit is going next to a bed, what matters is what your actual load does to the fan, not which spec sheet prints the lower peak.
Surge Power: Inverter Quality Indicator
The Apex 300 + B300K has a 2× surge-to-continuous ratio vs the DELTA 2's 1.5×, and the higher absolute ceiling with it — 7,680W against 2,700W. A higher ratio (≥2×) means the inverter absorbs motor startup surges better, which matters for fridges, AC compressors, and power tools that briefly draw 2-3× their rated wattage. With both measures pointing the same way, the DELTA 2 is the one more likely to trip when starting these appliances.
10ms vs 20ms: A Real Gap With No Consequence
The Apex switches to battery in 10ms and the DELTA 2 in 20ms, and both sit inside what a desktop, a router, a NAS or a CPAP rides through without noticing. It's a genuine difference in the spec that doesn't produce a different outcome for the equipment people actually plug in. If you're buying either one as always-on backup, choose on capacity and let the milliseconds go.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the DELTA 2 works out at 10 years of cover per $1,000 spent against the Apex 300 + B300K's 1.9, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The Apex 300 + B300K is rated for 6,000 cycles vs 3,000. In real life: at daily use, that's 16.4 vs 8.2 years. At weekend use (twice a week), it's 58 vs 29 years. One caution reading years across different sizes: a cycle is 5,530Wh on the Apex 300 + B300K and 1,024Wh on the DELTA 2, so count lifetime energy — roughly 33,178 kWh against 3,072 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
Full record above — the Test Desk pick is the Apex 300 + B300K.
Check Apex 300 + B300K price →or check the DELTA 2 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 2 is cheaper to buy, but the Apex 300 + B300K is cheaper to own. At $0.08/kWh over its lifetime vs $0.16/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
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the very top of the range, the DELTA Pro Ultra platform stacks batteries and inverters into whole-home backup — a flagship path, not a line-wide feature.
Worth knowing
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship portable (Apex 300, 2764.8Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The most inconsistent support in the space. Heavily email-based with China timezone delays. Some users get smooth, efficient service; others report weeks of troubleshooting runarounds, being offered discounts on new units instead of repairs, and confusing third-party purchase claim processes. Buying direct from Bluetti's website tends to produce better support outcomes.
Community
Active and growing — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
Among the best capacity-to-price ratios available — several Elite and Apex units are the lowest $/Wh in the catalog. Widest product diversity including industry-firsts like sodium-ion cold-weather units and dual solar+alternator vehicle hubs. Full LFP standardization across the lineup, though rated cycle life spans 2,500 (EB3A) to 6,000 (Elite units) — check the specific model. Dual-voltage (120V/240V) in flagships.
Worth knowing
Customer support inconsistency is the #1 risk factor. Older/discontinued units may become unrepairable — no spare parts policy for some models. Some reports of erratic communication from support agents.
Analyst note
Our brand assessment reads EcoFlow's support as polarized and BLUETTI's as the least consistent in the category, and that asymmetry lands differently at these two prices. A $499 unit that goes wrong is an annoyance you can absorb. A $2,599 two-box system in your utility room is not. Our assessment also notes BLUETTI outcomes tend to go better buying direct, so if you're taking the Apex, buy it somewhere you'd actually be willing to use the return policy.
Growth path
DELTA 2
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
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 500W) 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 2
The DELTA 2 has been out long enough to have a real record, and it's a consistent one: reliable, good value, and noisy under load. The fans trigger above 120W and run at roughly 48–55dB when it's pushing 1,500–1,800WA1. At 1,200W charging one reviewer likened them to a gaming laptop, and noted you can dial the charge rate down in the app to shut them upA2. Extended testing credits the fast charging, the LiFePO4 chemistry and the expandabilityA3.
Two caveats worth attaching. EcoFlow has indicated it intends to address fan noise in a firmware updateA4, so buy on how the unit behaves today rather than on that. And if you're running medical equipment above 120W in a bedroom, the fans are the reason people end up running an extension cord to the next roomA1.
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
Sources
portablepowerlab.com
BLUETTI Apex 300 + B300K
There's no owner record for this bundle yet, only reviewer test units, and what exists dates from mid-2025 into 2026 with nothing resembling a six-month longevity report or an idle-drain measurement for this exact combination. What the reviewers did find is consistent and useful: it does generator-class work without the noise or the fumesB4, one wash cycle pulled it from 100% to 65% and the dryer that followed took it to 20%B9B10, and recharge was fast enough that one tester had a full system back inside an hourB12. On weight the language is unanimous. Stacked it's near 150 pounds, movable with the built-in handles or a trolley but not something you'd casually carry to a picnicB5, and another reviewer called it too big and heavy for most people to move aloneB14.
One conflict you should know about before you read anyone's port list, including ours. The most detailed review says the base Apex 300 has no USB or DC ports at all beyond its six AC outlets and high-voltage connectors, and prices the D1 Power Hub that adds them at about $300B1B2. Our own spec data lists 100W USB-C for this system. The third source usually cited alongside those two is a complaint about the B300K expansion battery's weak USB outputB6, which is a different box in the stack. We can't resolve that contradiction from here, so don't decide either way on ports: confirm the exact port set for the exact bundle SKU with the seller before you buy.
“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
- Fan noise under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 · 3 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
“Fans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld — EcoFlow Delta 2 review · 2026 · [negative]
- A2
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
PCWorld — EcoFlow Delta 2 power station review · 2026 · [mixed]
- A3
“After 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use · 2026 · [positive]
- A4
“EcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”
portablepowerlab.com — EcoFlow Delta 2 Review · 2026 (dated claim — may be partially addressed) · [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]
- 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 August 9, 2026.
Who Should Buy Which
Buy the DELTA 2 if you…
- →You're building a blackout kit for a night, not a week. A 320Wh CPAP night, the router, the phones and a couple of lamps all fit inside 870Wh of usable capacity with room to spare.
- →The box has to travel. 27 lbs goes into a trunk one-handed, and that's a category the Apex system simply isn't competing in.
- →You want the cheapest honest way to own lithium storage that still runs real 120V loads. At $499 with an 1,800W inverter, nothing else on this page is close.
- →Your load might grow but hasn't yet. The DELTA 2 takes expansion batteries, so the first step up doesn't mean replacing the base unit.
Buy the Apex 300 + B300K if you…
- →Appliances are the point. If the plan involves a washer, a dryer, a well pump or a window AC, you want 3,840W continuous and 7,680W of surge, because 1,800W and 2,700W is where the DELTA 2 finds its ceiling.
- →You're off-grid full time. A 4,685Wh van-life day leaves the Apex 15Wh of margin out of 4,700Wh, which is fair notice that this is the size of system that job takes and the point where a second expansion battery stops being optional.
- →You already have the spot picked out. Two boxes, 148.8 lbs between them, backing up a house or a rig from one place and refilling off up to 2,400W of panels.
- →Multi-day outages are your actual risk. 4,700Wh of usable capacity is the difference between waiting out a three-day outage and managing one.
If neither fits
If the biggest thing you plug in is a laptop and a phone charger, both of these are more battery than you will ever discharge, and a smaller unit with a panel does that job for a fraction of $499. And if what you really want is for the lights to just stay on without you touching anything, neither of these is that product: you're shopping a hardwired home battery with a transfer switch, which is an installation with an electrician attached rather than a box you plug in.
The Bottom Line
Buy the Apex 300 + B300K if your day clears 870Wh, and buy the DELTA 2 if it doesn't. That really is the decision, because at 47 cents a watt-hour against 49 the market has already declared these the same product at two sizes. The Apex sweeps all six scenarios not because it's the better machine but because it's roughly five times the machine, and it asks a fair price for being so.
The clearest way to feel the gap is the laundry. One wash cycle took the Apex system from 100% to 65%B9, about 1,935Wh of a 5,529.6Wh pack, and nearly twice everything the DELTA 2 holds. If that's the kind of work you're buying for, the $499 unit was never actually in the running. If it isn't, keep the $2,100 and spend it on panels.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Apex 300 + B300K worth $2,100 more than the DELTA 2?
Only if your day needs the capacity, because going bigger earns you no discount here. The DELTA 2 works out to $0.49 per watt-hour and the Apex system to $0.47, two cents apart, so the $2,100 between $499 and $2,599 is buying watt-hours at the market rate. Work out your daily draw first: above the DELTA 2's 870Wh of usable capacity the extra money is necessary, and below it, it's decoration.
How many boxes is the Apex 300 + B300K, and can one person move it?
Two boxes. The system's 5,529.6Wh divided by the Apex 300's own 2,764.8Wh is exactly two units, and the 148.8 lbs on the spec sheet is the pair, not a single object. You move the pieces separately and then you stop moving them. Plan the placement, not the lift.
Can the DELTA 2 run a refrigerator through an outage?
Running one is within reach; starting it is where the margin gets thin, and finishing the night is where capacity runs out. The DELTA 2 delivers 1,800W continuous with 2,700W of surge, a 1.5x ratio, while compressors briefly pull well above their rated draw at startup. Even when it starts cleanly, the eight-hour blackout profile needs 1,645Wh against its 870Wh usable, so it's 775Wh short of the night. The Apex system covers those same eight hours at 35% used.
Which one is quieter for a CPAP?
The spec sheet says 45dB for the Apex against 50dB for the DELTA 2, but at CPAP loads that comparison isn't measuring anything useful. The DELTA 2's fans only spin up above 120W, and its loud figure belongs to 1,500–1,800W operation, while a CPAP night is about 320Wh across eight hours. Decide on runtime instead: 870Wh of usable capacity covers two of those nights and most of a third, and 4,700Wh covers fourteen.
Does the smaller DELTA 2 charge faster from solar?
No, they refill in roughly the same window. The DELTA 2 takes up to 500W into 1,024Wh, which is just over two hours at full input, and the Apex takes up to 2,400W into 5,529.6Wh, about two and a half. Those are rated ceilings and real panels rarely reach them, but the relationship holds: the bigger system didn't trade refill speed for capacity.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow DELTA 2
$499.00
$499.00 · direct from EcoFlow
Last checked 52 days ago. Prices move — check before you buy.
BLUETTI Apex 300 + B300KPick
$2,599.00
$2,599.00 · direct from BLUETTI
Last checked 3 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.