Head-to-head test
EcoFlow DELTA 3 Max Plus vs BLUETTI Apex 300 + 2×B300K
This is not two power stations. It is a 50.7 lb box you carry and a 213.9 lb bank you site, and the price gap only starts mattering after you have decided which of those two things you are shopping for.
Full profiles: EcoFlow DELTA 3 Max Plus → · BLUETTI Apex 300 + 2×B300K →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Buy the DELTA 3 Max Plus. It covers the energy in four of the six days we model, weighs 50.7 lbs, and costs $2,500 less than the Apex 300 + 2×B300K, which is a lot of money to spend closing a gap most buyers never reach.
The Apex bundle's case is real, and it is not about price. It brings 8,294Wh against 2,048Wh, 3,840W continuous against 3,000W, a 240V outlet, a 30A RV socket, and 6,000 rated cycles to the DELTA's 4,000. Over the rated life that works out to seven cents a lifetime kilowatt-hour against fifteen. If you are backing up a well pump or living in a van, stop reading and buy it.
For everyone else the tiebreak is refill. The DELTA 3 Max Plus went to 80% in about fifty minutes and full in around seventyA3, while the field record on this exact Apex configuration is mostly complaints about input that misbehavesB1B2B8B9. A small pack you can refill in an hour behaves like a bigger pack. A big one you cannot refill is a one-shot.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Whether that matters depends entirely on daylight and grid. Plug the DELTA in for an hour at a neighbour's, a cafe, or during the four hours the power comes back, and its one-night bank resets for the next night. When nothing comes back on for three days, there is no version of 96Wh that helps, and the Apex bundle stops being an extravagance.
The 8-hour blackout profile needs 1,645Wh; the DELTA 3 Max Plus has 1,741Wh usable after the flat 85% derate and finishes at 94% used with 96Wh leftThe Apex 300 + 2×B300K finishes the same night at 23% used with 5,405Wh still in the bankThe DELTA 3 Max Plus reached 80% in about fifty minutes and full in around seventyA3
Why it mattersIf your outages are evening-long or your grid flickers back during the day, the DELTA is enough. If they are multi-day and genuinely gridless, buy the bank and stop comparing.
A 240V load is not something a bigger inverter argues its way into. A well pump, an electric dryer or a car you want to charge at real speed is either on the list or it is not, and if it is, the DELTA 3 Max Plus is disqualified at 2,048Wh and at 10kWh alike. Run the same test in reverse before you buy the bundle: if your fridge is a 12V compressor unit in a vehicle, the socket you need is the one the Apex record does not have.
The Apex bundle's record carries a 240V outlet and a 30A RV socket; the DELTA 3 Max Plus's record carries zero of eachThe DELTA 3 Max Plus's record carries a 12V car socket; the Apex bundle's record carries noneBoth records carry six AC outletsOne owner charges a plug-in hybrid from the Apex 300's 240V output when they stopB5
Why it mattersRead your own load list for 240V and 12V before you look at either price. It settles this page faster than any spec table.
solar input
An 8,294Wh bank is only a multi-day bank if you can put the energy back into it, and every unresolved report on this configuration is about putting energy back inB1B2B8B9. The DELTA's answer is boring and verified: about seventy minutes on a wall socketA3, which is why its 2,048Wh behaves like more than 2,048Wh anywhere the grid exists.
The Apex bundle accepts 2,400W of solar against the DELTA 3 Max Plus's 1,000W, and the engine calls that the stronger off-grid growth pathSolar owners call the base unit's 60V input ceiling misleadingB8 and report solar going undetected until the cables are unplugged and replugged, which BLUETTI has acknowledged as a firmware faultB9In this multi-battery configuration owners report the packs charging at different rates to different states of chargeB1, one owner could not get BLUETTI to show an Apex 300 charging above 1,200WB2, and support called the behaviour normalB3
Why it mattersIf your plan is solar-only and grid-down, test the Apex bundle's input in the first week while a return is still easy. If you have mains power most days, the small fast box is the better machine.
weight
The real difference is when you pay and what you end up owning. Buy the DELTA and you own 2,048Wh today, at a weight one person moves, with a documented path if the need grows and no obligation if it does not. Buy the bundle and you own 8,294Wh today and a 213.9 lb installation, sized for a load you have not yet proven you have. Extra batteries cost money that is not on this page either way.
Reviewers put the DELTA 3 Max Plus's expansion range at 2kWh up to 10kWh through Smart Extra Batteries, and describe adding them as polished rather than fiddlyA4The Apex bundle ships with 8,294Wh and also takes further batteries; our payload does not name its ceilingThe DELTA 3 Max Plus weighs 50.7 lbs; the Apex bundle weighs 213.9 lbs and our record marks it stationary
Why it mattersAnyone unsure of their real daily draw should buy the smaller unit and add capacity when a need actually appears, not in advance of one.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Six modelled days settle this: the DELTA 3 Max Plus covers the energy in four of them, and the two it misses need 2,100Wh and 4,685Wh in a single sitting.
Four of the six days we model fit inside the DELTA 3 Max Plus, and the two that do not fail by a distance rather than a whisker: the 2,100Wh camping weekend leaves it 359Wh short, and the 4,685Wh van day leaves it 2,944Wh short. Neither is a near miss you engineer around with a longer cable. They are the line between the two products.
The eight-hour blackout is the row to stare at. The DELTA finishes it at 94% used with 96Wh in reserve; the Apex bundle finishes at 23% with 5,405Wh, which is three more nights like it. Transfer time is a dead heat, both records carrying a ceiling of 10ms, so neither will drop a desktop mid-sentence. The question was never whether you get through tonight. It is whether you get through Thursday.
Portability & Form Factor
Selected because: 50.7 lbs against 213.9 lbs, and our record marks the Apex bundle stationary. For most buyers that one line ends the shopping.
weight
213.9 lbs across its boxes is not a heavy power station, it is furniture. Our record marks the Apex bundle stationary, and the honest reading of that is you will choose a corner, run the cables, and never move it again. The DELTA 3 Max Plus at 50.7 lbs is a bent-knees lift into a trunk, after which you drive off with it.
There is a quieter split at the sockets. The DELTA carries a 12V car socket and the Apex bundle's record carries none, which decides the day you want to run a 12V compressor fridge in a vehicle. The Apex bundle carries the 240V outlet and the 30A RV receptacle the DELTA does not. Six AC outlets each, and then the overlap stops.
Lifetime Value
Selected because: Seven cents a lifetime kilowatt-hour against fifteen, which is where you decide whether you will ever cycle a battery hard enough to collect it.
cost / lifetime kWh
Seven cents a lifetime kilowatt-hour against fifteen. The Apex bundle is the cheaper energy by a wide margin and it earns that honestly on volume: roughly 49,766 kWh across its rated life against 8,192 kWh.
Read it as a ceiling on value rather than a rebate. Those cents only arrive if you cycle the thing thousands of times, and the household that runs a CPAP and two outages a year will not spend a tenth of them. Per-kWh arithmetic always flatters the unit you would use hardest, which is exactly why it flatters the bank here, and why the $2,500 between them is still real money handed over on day one.
Growth Path
Selected because: Both units take extra batteries, so the ceiling matters more than today's 2,048Wh, and paying later is the whole case for the smaller box.
solar input
Both units take extra batteries, so compare ceilings rather than today's capacity. Reviewers put the DELTA 3 Max Plus's range at 2kWh up to 10kWh through Smart Extra Batteries and call the process polishedA4, which means the cheaper unit's ceiling clears the 8,294Wh the Apex bundle ships with. The bundle takes more batteries too and our payload does not name its limit, so this is not a claim that the DELTA out-grows it. It is a claim that the DELTA is not capped underneath it.
Where the bundle genuinely pulls ahead is input: 2,400W of solar against 1,000W, which is the real argument for putting a large bank off-grid. Read the owner section before you lean on itB8B9.
Brand Trust
Selected because: Both records carry five years, though BLUETTI's is the buy-direct or registered maximum, and the two makers behave very differently when you need to use it.
Both records carry five years, and on BLUETTI that five is the buy-direct or registered maximum rather than a floor, so where you buy changes what you own. Coverage is not the differentiator on this page. Getting someone to honour it is.
EcoFlow answers a US phone number, and the complaints against it are about waiting and about refurbished units arriving against new claims. BLUETTI is email, on China hours, and the reports split hard between clean fixes and multi-week silenceB4B11. On the more expensive of the two units, that asymmetry deserves pricing in, and buying direct from BLUETTI rather than through a marketplace is the cheapest thing you can do about it.
Strengths & trade-offs
EcoFlow DELTA 3 Max Plus
Strengths
- +Costs $2,500 less
- +Lighter by 163.2 lb
Trade-offs
- –Weaker inverter (-840W) limits appliance compatibility.
- –Shorter-lived battery — rated for 4,000 charge cycles vs the Apex 300 + 2×B300K's 6,000, so it wears out sooner.
BLUETTI Apex 300 + 2×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 (+$2,500) than the DELTA 3 Max Plus.
- –Significantly heavier (+163.2 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
Nobody wins this one. A 2,100Wh weekend leaves the DELTA 3 Max Plus 359Wh short, which is Sunday morning without coffee, and the Apex bundle finishes the same weekend at 30% used while sitting exactly where you left it, because 213.9 lbs does not go to a trailhead. If camping is your main use, the honest answer is a portable one size up from the DELTA rather than either unit here.
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 + 2×B300K
Both survive the night. The Apex 300 + 2×B300K finishes at 23% used with 5,405Wh left — 3.3 more nights like it. The DELTA 3 Max Plus finishes at 94% with 96Wh, 6% of a second night. If your outages tend to run past one evening, that difference is the whole argument between them.
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
A CPAP is about 40W for eight hours, so 320Wh, and both of these swallow it without noticing: 18% of the DELTA 3 Max Plus, 5% of the Apex bundle. Capacity is not the question at this load. Placement is. One of these is a 50.7 lb box that can sit beside the bed; the other is 213.9 lbs of sited equipment in a garage or utility room with a cord running toward your pillow. That is why the row goes to the DELTA.
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 + 2×B300K
The Apex 300 + 2×B300K clears the workday at 13% used, banking 6,140Wh — late work, extra calls, or a second laptop charge without arithmetic. The DELTA 3 Max Plus at 52% also finishes, with 831Wh of slack for the unplanned.
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 3 Max Plus
A 400W peak is untroubling for either inverter, and 670Wh is 38% of the DELTA 3 Max Plus's usable pack with 1,071Wh left over. The Apex bundle loses this on the loading, not the load. At 213.9 lbs it is not getting into the truck, and banked energy cannot fix a unit that does not arrive.
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 + 2×B300K
This is the row that justifies the Apex bundle. A 4,685Wh day is more than double the DELTA 3 Max Plus's entire nameplate pack, and it finishes 2,944Wh short with about 37% of the day covered. That is not a gap you close with a careful hand on the thermostat. The Apex bundle covers the same day at 66% used with 2,365Wh in reserve, and a van is the one place you were going to bolt something down anyway.
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 + 2×B300K runs 34.4h vs 8.5h.
$3,699 list · direct from BLUETTI
Planning for more than this? Describe your whole setup and get it sized →
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 0–470hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–94hHigh-Draw Appliances
These reveal the real limitsscale 0–7.1h¹ 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
September 19, 2026
Verdict: the EcoFlow DELTA 3 Max Plus
The DELTA 3 Max Plus wins on fit rather than on specs. Its 1,741Wh usable clears the CPAP night, the remote workday, the tailgate and an eight-hour blackout, and it does all of it at 50.7 lbs and $2,500 less. The Apex 300 + 2×B300K is the better machine in the two places the DELTA runs out, a 4,685Wh van day and an outage that carries into a second night, and it is the only unit here whose record carries a 240V outlet and a 30A RV socket, which is a requirement you either have or you do not. Confidence is moderate rather than high for one reason: if your outages are multi-day and gridless, the DELTA finishing a single night with 96Wh left is not a plan, and the money you saved does not fix it.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$1,199.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
or check the Apex 300 + 2×B300K price$3,899.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Prices to beat:DELTA 3 Max Plus $1,099Apex 300 + 2×B300K $3,699
The lowest we have recorded for each. We have never seen the Apex 300 + 2×B300K discounted, so any real cut on it would be a first.
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, Solar Generator, Tailgating, Apartment Balcony.
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, DELTA 3 Max Plus rates 4.3/5 (56th percentile of 26 Large-class units), and Apex 300 + 2×B300K rates 3.4/5 (7th percentile of 29 Whole-Home / Off-Grid-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
Apex 300 + 2×B300K: You Site It Once
213.9 lbs is spread across several boxes, so no single lift is the problem. The sixth trip is. Decide the location before it arrives: reachable from the panel, near the outlets you actually use, on a floor you do not mind loading, somewhere you can get a solar cable to. Then treat it as installed, because you will not be relocating it on a whim. The DELTA 3 Max Plus at 50.7 lbs is the one you can change your mind about.
Two Ratings, Two Different Rulers
Both makers publish a decibel figure for these units and they do not measure the same way, so the difference between the two numbers is not a gap you can hear, and neither figure describes the 40W a CPAP actually draws. What you can rely on is geometry. One of these is small enough to end up in a bedroom and the other ends up wherever you sited it, which is rarely a bedroom. Let that settle the sleeping question instead of the ratings.
Apex 300 + 2×B300K: Power Lifting to 7,680W
The Apex 300 + 2×B300K has BLUETTI's Power Lifting mode, which runs a resistive appliance rated up to 7,680W from its 3,840W inverter. It does that by delivering less power than the appliance asks for, not more than the inverter has: the heater still works, it just heats more slowly. Two things follow. BLUETTI scopes the mode to purely resistive loads — a heater, a kettle, an incandescent lamp — so it does nothing for a fridge compressor, a pump or a power tool, and this record publishes no surge figure at all, so read the mode as a resistive-load feature rather than as starting ability. And it is not a reason to size down, because running a load that big from 8,294Wh is a short session either way. Genuinely useful if a heater or a kettle is why you're buying; beside the point otherwise. The DELTA 3 Max Plus publishes no equivalent.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. The Apex 300 + 2×B300K's figure is a maximum rather than a guarantee — it depends on buying direct from BLUETTI or registering the unit, since reseller purchases carry a shorter term. Worth saying because the per-dollar framing can suggest otherwise: the DELTA 3 Max Plus works out at 4.2 years of cover per $1,000 spent against the Apex 300 + 2×B300K's 1.4, but that spread is the price gap, not the terms.
The Best Argument Against Our Verdict
6,000 rated cycles against 4,000, on a pack four times the size, is the one figure that does not care what the rest of this page concluded. At daily cycling that is 16.4 years against 11, and on total energy delivered over the rated life it is not close. If you genuinely intend to cycle a battery hard for the next decade and a half, the Apex bundle is the cheaper machine and we are not going to pretend otherwise. Most buyers never reach either limit, and neither battery dies when they do. It settles to roughly 80% of the capacity it started with and keeps going.
Full record above — the Test Desk pick is the DELTA 3 Max Plus.
Check DELTA 3 Max Plus price →or check the Apex 300 + 2×B300K 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 3 Max Plus is cheaper to buy, but the Apex 300 + 2×B300K is cheaper to own. At $0.07/kWh over its lifetime vs $0.15/kWh, the Apex 300 + 2×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
A US phone number, which is worth more than it sounds, and outcomes that split. Plenty of prepaid-label replacements that just work, and a steady stream of long waits and refurbished units sent against new claims. Buying through a retailer with its own return window is cheap insurance.
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
The deepest ecosystem in portable power and the fastest charging in it. The second of those is why a 2,048Wh box can punch above its capacity: the pack you refilled this afternoon is the pack you have tonight.
Worth knowing
EcoFlow floated a subscription for advanced app features in early 2025 and backed off after the community objected. There is no out-of-warranty parts or service programme, so year six is on you.
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 weak link, and on the more expensive of these two units that is the thing to weigh. It is mostly email, on China hours, and the outcomes are genuinely polarised: some tickets close cleanly, others turn into weeks of runaround or an offer of a discount on a new unit instead of a repair. Buy direct rather than through a marketplace, because third-party purchase claims are where it gets tangled.
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
Some of the best capacity per dollar in the catalogue, and the widest range of genuinely unusual hardware: sodium-ion cold-weather units, solar-and-alternator vehicle hubs, balcony storage. When BLUETTI ships something odd it is usually first.
Worth knowing
Rated cycle life varies within a product family rather than tracking it, so check the specific model instead of trusting the range name. Older units can become unrepairable where there is no spare-parts policy behind them.
Analyst note
EcoFlow sells you a faster box and a phone number. BLUETTI sells you more energy per dollar and an email address. Both carry five years on these two records, so on a purchase of this size the question is not who covers you, it is who picks up. Decide what the phone number is worth to you before the spec sheet decides it for you.
Growth path
DELTA 3 Max Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 2,048Wh.
Accepts up to 1,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Apex 300 + 2×B300K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 8,294Wh.
Accepts up to 2,400W of solar. Enough for a serious multi-panel array.
Limited ports. You'll likely need a power strip or splitter.
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 + 2×B300K's higher solar ceiling (2,400W vs 1,000W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Max Plus
Field evidence on the Max Plus is review-desk evidence rather than long-haul ownership, which our own research note says plainly: long-term owner data is still accumulatingA0. What the desks did test happens to be the two things that decide this page. It stays genuinely quiet under typical loads, spinning its fans up only briefly at shutdown, with a meter barely reading above room noise at a metre even while charging at full powerA2. And it went to 80% in about fifty minutes, full in around seventyA3. Reviewers also frame it as the higher-output, larger-ceiling step on its platform and describe the expansion as effortless rather than fiddlyA1A4.
“Bumps output to 3,000W continuous with a 6,000W surge — a significant upgrade over the DELTA 3 Max's 2,400W and 4,800W surge.”
Sources
storagereview.com · androidguys.com · t3.com · trustedreviews.com
BLUETTI Apex 300 + 2×B300K
The Apex bundle launched in 2025 and the record on it is thinB0. Nothing our researcher found runs past about six months of ownership, no threads specific to this exact two-battery configuration turned up at all, and cold-weather behaviour is absent from every source, so what exists comes from forum owners and hands-on reviewers rather than long-term usersB0. It is also pointed. In a DIY Solar Power Forum thread on Apex 300 problems, an owner describes the packs charging at different rates and sitting at different states of charge, one at 100% and one at 50%B1; another asked BLUETTI for video of an Apex 300 charging above 1,200W and says none was producedB2; support called the behaviour normal, which that owner read as disqualifying for off-grid useB3. Solar owners are loudest about the base unit's 60V input ceiling, a word they use for it is misleadingB8, and about solar going undetected until the cables are physically unplugged and replugged, which BLUETTI has acknowledged as a firmware issueB9. RMA stories run to two weeks of troubleshooting and unanswered follow-upsB4, and support overall is described as ranging from helpful to non-existentB11.
The positives are real too, and they are the ones that argue for buying the bank. Reviewers found the fan even, with no distracting pitch or rattle, and usable near a sleeping area or an indoor deskB14; measured a 20W AC idle draw, which is the unglamorous spec that lets a big pack coast through a long outageB15; and reported running household essentials for more than a full day without rationingB16. One owner puts it in the back of a plug-in hybrid and charges the car from the 240V output during stopsB5. Another, pricing a DIY van system of similar capacity from separate parts, found the bundle came out about the same or cheaperB6. On weight the sources agree without dissent: too big and heavy for most people to move alone, and a lump even to the van builders who wanted itB12B13.
“For me the 240V output is great. I can stick it in the back of my PHEV and use the 240V output to charge at 3.3KW when I stop.”
Sources
bluettipower.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
- The Max Plus delivers more output and surge than the Max, plus a larger expansion ceiling, while staying quiet and fast-charging — a polished, higher-power take on the same platform. [DELTA 3 Max Plus · 3 entries]
- When multiple Apex 300 units (as in this 2x-B300K configuration) are charged together, owners report state-of-charge sync problems and solar input capped far below the advertised rating, which Bluetti support has called 'normal' behavior. [Apex 300 + 2×B300K · 3 entries]
- Customer/RMA support experience is inconsistent — some owners report smooth help, others describe multi-week delays and unresponsive tickets. [Apex 300 + 2×B300K · 2 entries]
- The base unit's 60V solar input ceiling and a firmware bug that drops solar detection (requiring an unplug/replug) are the two most-cited technical gripes among solar-focused owners. [Apex 300 + 2×B300K · 2 entries]
- Because the Apex 300 ships with no built-in DC/USB ports, owners and reviewers alike flag the mandatory ~$300 Hub D1 accessory as an unexpected added cost. [Apex 300 + 2×B300K · 2 entries]
- Despite being marketed as 'portable,' the unit's weight (~38kg/85lb base alone, more with B300K batteries) leads multiple sources to describe it as effectively a stationary/semi-permanent installation rather than something carried around. [Apex 300 + 2×B300K · 2 entries]
- A1
“Bumps output to 3,000W continuous with a 6,000W surge — a significant upgrade over the DELTA 3 Max's 2,400W and 4,800W surge.”
storagereview.com / androidguys.com — DELTA 3 Max Plus review · 2026 · [positive]
- A2
“Stays genuinely quiet under typical loads, only spinning up its fans briefly during shutdown; even charging at full power the decibel meter barely registered above room noise at one meter.”
t3.com / trustedreviews.com — DELTA 3 Max Plus review · 2026 · [positive]
- A3
“Fast charging — reached 80% in about 50 minutes and full in around 70 minutes.”
t3.com — DELTA 3 Max Plus review · 2026 · [positive]
- A4
“Scalable — supports expandable capacity from 2kWh up to 10kWh via Smart Extra Batteries, with 5 charging methods; reviewers describe it as polished and effortless.”
storagereview.com / t3.com — DELTA 3 Max Plus review · 2026 · [positive]
- B1
“When the units are charging from the grid they charge at different rates and not together... you may have one at 100% and one at 50%.”
DIY Solar Power Forum — thread 'Bluetti Apex 300 problems' · 2025-09 · [negative]
- B2
“I have requested a short video from Bluetti showing an APEX 300 actually charging more than 1200 watts. They have been unable to produce one.”
DIY Solar Power Forum — thread 'Bluetti Apex 300 problems' · 2025-09 · [negative]
- B3
“Bluetti support says this is normal... This makes them a bad choice for off grid applications.”
DIY Solar Power Forum — thread 'Bluetti Apex 300 problems' · 2025-09 · [negative]
- B4
“It has taken me 2 weeks of troubleshooting with them and a week to get an RMA approval... I have asked for updates with NO response 48 hours later.”
DIY Solar Power Forum — thread 'Apex 300 Support issues' · 2025-11 · [negative]
- B5
“For me the 240V output is great. I can stick it in the back of my PHEV and use the 240V output to charge at 3.3KW when I stop.”
DIY Solar Power Forum — thread 'Bluetti Apex 300 launched today… anyone have thoughts?' (page 2) · 2025-05 · [positive]
- B6
“It came in just shy of £1500... Pricing up a similar system from scratch with similar capacity, solar charger, split charger, smart shunt, inverter ect was all coming in at a similar if not slightly higher price.”
VW T6 Transporter Forum — thread 'Bluetti Apex 300' · 2025-07 · [positive]
- B8
“The 60V solar limit is the most common and vociferous complaint, with users calling it "misleading" and a "joke".”
BIKMAN TECH blog aggregating user/forum reports — 'Bluetti APEX 300 - Everything You Need to Know' · 2025-11 · [negative]
- B9
“the unit failing to detect solar input until the cables are physically unplugged and replugged. Bluetti support has reportedly acknowledged this as a known firmware issue”
BIKMAN TECH blog aggregating user/forum reports — 'Bluetti APEX 300 - Everything You Need to Know' · 2025-11 · [negative]
- B11
“Customer support is dangerously polarized. User experiences range from "great" and "helpful" to "notoriously non-existent" and "a disaster".”
BIKMAN TECH blog aggregating user/forum reports — 'Bluetti APEX 300 - Everything You Need to Know' · 2025-11 · [mixed]
- B12
“it weighs in at 38kg, and is probably much too big and heavy for most people to carry alone.”
Trusted Reviews — 'Bluetti Apex 300 Review' · 2025-10 · [mixed]
- B13
“Even that is quite a lump though! Keep us posted @RacingSlow you may be the future of van electrics!”
VW T6 Transporter Forum — thread 'Bluetti Apex 300' (van-conversion owner discussion) · 2025-07 · [mixed]
- B14
“Fan noise remains even, with no distracting pitch or rattle. This makes the Apex 300 usable near sleeping areas or indoor workspaces without disturbance.”
Yanko Design — 'BLUETTI Apex 300 Review: The All-in-One Solar, Gas, and Battery Solution' · 2025-05 · [positive]
- B15
“Efficient 20W AC idle drain extends runtime significantly during extended outages.”
Yanko Design — 'BLUETTI Apex 300 Review: The All-in-One Solar, Gas, and Battery Solution' · 2025-05 · [positive]
- B16
“With some portable power stations, I'd have to ration power more carefully, but with this system, I could run essentials for more than a full day if I needed to.”
Techspective — 'Bluetti Apex 300 with B300K Review' · 2025-09 · [positive]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA 3 Max Plus if you…
- →You want one box that goes in the trunk for a campsite, lives under the desk on a work-from-anywhere day, and carries the fridge and a few lamps through an evening outage. 50.7 lbs, one person, no cart, no siting decision.
- →You are the person eighteen inches from it at 3 a.m. with a CPAP running. That is 320Wh out of 1,741Wh usable, under a fifth of the pack, and at 50.7 lbs it is small enough to be in the bedroom in the first place.
- →You do not yet know how big your needs get. Start at 2,048Wh and add batteries when a shortfall actually shows up, rather than buying four times the capacity against a load you have not measured.
Buy the Apex 300 + 2×B300K if you…
- →Your load list has a 240V item on it, a well pump, an electric dryer, or a car you would like to charge at a useful rate. The DELTA 3 Max Plus's record carries no 240V outlet, so this is not a close call, it is the only option on the page.
- →You are wiring a van, a trailer or a workshop and want a 30A RV feed and 2,400W of solar into one bank. Budget an afternoon for siting it and test the solar input in the first weekB8B9.
- →Your outages run into a second and third night. 7,050Wh usable finishes the eight-hour blackout at 23% used and leaves 5,405Wh for the nights that follow, which is the one thing no amount of fast charging gives the DELTA.
If neither fits
If what you want is a carryable box that covers a 2,100Wh camping weekend, neither of these is it. The DELTA 3 Max Plus lands 359Wh short of that weekend and the Apex bundle is not coming to the trailhead, so look one size up the portable range instead of compromising on either. And if your real goal is whole-home backup that switches over by itself and never needs carrying anywhere, close this page and price a hardwired home battery with a transfer switch. Both units here are things you plug loads into by hand.
The Bottom Line
Take the DELTA 3 Max Plus. It handles the CPAP night, the workday, the tailgate and the eight-hour blackout, it goes into a trunk at 50.7 lbs, and it leaves $2,500 in your account. When it is empty it is full again in about seventy minutesA3, and that is the spec that makes 2,048Wh behave like more than 2,048Wh everywhere the grid still works.
The Apex 300 + 2×B300K is the better bank, and if your list has a 240V item on it, or your outages run into a second and third night, it is the only unit on this page that answers. Buy it knowing exactly what it is: an appliance you site once, at more than four times the DELTA's weight, from a maker whose support reports split between helpful and non-existentB11. If that is not the problem you are solving, the smaller box is the better buy.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the BLUETTI Apex 300 with two B300K batteries portable at all?
Not in any useful sense. This configuration weighs 213.9 lbs across its boxes and our record marks it stationary, so it is hardware you site rather than hardware you carry. Reviewers reached the same conclusion about the base unit on its own, calling it too big and heavy for most people to move alone. Plan a permanent spot for it before it arrives.
Can the DELTA 3 Max Plus run my house through a power cut?
Through an evening, yes. It clears our 1,645Wh eight-hour blackout profile and finishes with 96Wh left, and its transfer ceiling of 10ms means a desktop or a modem will not notice the switch. Past one night it runs out, and its record carries no 240V outlet, so a well pump or an electric dryer sits outside what it can do at any capacity.
Which one is actually cheaper to own?
The Apex bundle, at seven cents a lifetime kilowatt-hour against fifteen for the DELTA 3 Max Plus. That only pays back if you cycle it, though, because the figure spreads the purchase across roughly 49,766 kWh of rated lifetime energy. A household that uses a power station a few weekends and two outages a year will never approach that, and for them the $2,500 not spent is the better deal.
Can I just add batteries to the DELTA 3 Max Plus instead of buying the bundle?
Yes, and further than you might expect. Reviewers put its expansion range from 2kWh up to 10kWh through EcoFlow Smart Extra Batteries, which clears the 8,294Wh the Apex bundle ships with. Two caveats: those batteries cost money that is not priced on this page, and no amount of added capacity gives the EcoFlow a 240V outlet or a 30A RV socket.
Does the Apex 300 really take 2,400W of solar?
That is what our record carries for this configuration, 2.4 times the DELTA 3 Max Plus's 1,000W ceiling. But solar-focused owners are loudest about the base unit's 60V input limit, calling it misleading, and about a firmware fault where solar goes undetected until the cables are unplugged and replugged, which BLUETTI has acknowledged. One owner also could not get BLUETTI to demonstrate an Apex 300 charging above 1,200W. If your plan is solar-only, verify the input behaviour in week one while a return is still straightforward.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow DELTA 3 Max PlusPick
$1,199.00
$1,199.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
BLUETTI Apex 300 + 2×B300K
$3,899.00
$3,899.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.