Head-to-head test
EcoFlow DELTA Pro Ultra vs BLUETTI AC240P
The bigger box is somehow also the cheaper energy, $0.65 per watt-hour against $0.79, so the only question left is whether you're installing this thing or carrying it.
Full profiles: EcoFlow DELTA Pro Ultra → · BLUETTI AC240P →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
The DELTA Pro Ultra costs $4,199 and holds 6,144Wh. The AC240P costs $1,462 (last listed price) and holds 1,843Wh. That's 2.7 times the money for 3.3 times the energy, which makes the flagship the cheaper watt-hour on this page: $0.65 against $0.79. Shop on cost per unit of energy and the argument is over before it starts.
It's over for the wrong reason, though. At 181.8 lb the DELTA Pro Ultra is something you install; at 72 lb the AC240P is something you carry, and our scenario suite has no category for that difference. It scores Weekend Camping and Tailgate Party as though a 181.8 lb system drove itself to the field. The DELTA Pro Ultra takes all six scenarios. Two of those wins are an artifact of the scoring, not the product.
So the verdict comes with a fence around it. If this is getting wired into a house, take the DELTA Pro Ultra: 7,200W continuous, 10,800W surge, ten years of warranty, and three times the AC240P's 2,400W output. If it's ever going to sit in a truck bed in the rain, the AC240P at $1,462 (last listed price) was the only real candidate here and the comparison was never actually running.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Because the cycle counts are identical at 3,500, the lifetime-value table is that same ratio wearing a hat: $0.19 per lifetime kWh against $0.23, same order, same margin. No longer-horizon argument is coming to rescue the AC240P's sticker. Its case has nothing to do with value per watt-hour and never did.
DELTA Pro Ultra: $4,199 for 6,144Wh, which is $0.65 per WhAC240P: $1,462 (last listed price) for 1,843Wh, which is $0.79 per WhBoth units are rated 3,500 cycles
Why it mattersIf you're shopping on cost per unit of energy, that question is already settled. Decide instead whether 1,843Wh covers your worst night, because headroom is the only thing the AC240P's lower price is actually costing you.
weight
The spec an outdoor buyer actually needs isn't in the scoring at all. The AC240P is the only one of these two with a weather rating and field testing behind itB1B2, and the DELTA Pro Ultra has no counter because it was never meant to be outside. Once the box leaves the house the sweep evaporates, and a rating the table can't see decides the purchase.
The DELTA Pro Ultra wins all six scenarios181.8 lb against 72 lbThe AC240P is IP65 rated, tested through a six-hour rainstorm and constant saltwater sprayB2, valid only with every port cover closedB1
Why it mattersCampers, tailgaters, boat and jobsite buyers: ignore the scenario table on this page and buy the AC240P.
continuous output
That makes the ceiling a wattage question before it's a capacity question. A load the AC240P can't start is a load it can't run for one second, no matter how many watt-hours sit behind it, and owners have put the DELTA Pro Ultra's inverter on a 3-ton central ACA4. Nothing rated 2,400W continuous joins that conversation.
DELTA Pro Ultra: 7,200W continuous, 10,800W surgeAC240P: 2,400W continuous, 3,600W surgeOwners report the 7,200W inverter running a 3-ton central ACA4
Why it mattersWrite the load list before you compare capacities. If a large compressor is on it, the AC240P is eliminated at the inverter and the watt-hour comparison never happens.
The specific dimensions that decide these two units — everything else is a tie.
Portability & Form Factor
Selected because: 181.8 lb against 72 lb is the whole decision: one of these gets installed, the other gets carried.
weight
72 lb is one person, bent knees, into a truck bed. 181.8 lb is a decision about where the unit lives, made once, probably with help. That isn't a spectrum, it's two different products sharing a comparison page, and it settles more of this matchup than capacity does.
The AC240P owns the outdoor half outright. Reviewers left it in a six-hour rainstorm and found the interior bone dry, then ran it through constant saltwater spray on a sailboat with no moisture intrusionB2. The DELTA Pro Ultra has no answer to that because nobody designed it to need one. The catch is worth repeating: IP65 only holds with every port cover shutB1, so the moment a cable runs out of it in the rain you're back to owning a normal box. A normal box you can lift, though.
Your Life, Your Pick
Selected because: The DELTA Pro Ultra takes all six, and two of the six are scored as though a 181.8 lb system carried itself to the campsite.
Two of the six wins shouldn't count, and they're the two named after places you drive to. Weekend Camping and Tailgate Party reward stored energy with no term for getting the unit there, which is how a 181.8 lb system sweeps a camping scenario. Note it once and move on.
The four that do count split cleanly. Van Life Daily and Weekend Camping are capacity walls the AC240P can't climb, missing by 3,118Wh and 533Wh. The eight-hour blackout is a 78Wh miss, the thinnest loss on the page. And CPAP Overnight and Remote Workday are wins the DELTA Pro Ultra doesn't need, because both units clear a 320Wh night and a 910Wh workday without breathing hard. Strip out the two the scoring got wrong and the two that were never close, and this comes down to one honest question: does your day look more like 910Wh or more like 4,685Wh?
Lifetime Value
Selected because: $0.65 per watt-hour against $0.79 puts the bigger unit on the cheaper side of the energy math, which is not how this usually goes.
Everything in this section is one fact wearing different hats, and the fact is $0.65 per watt-hour against $0.79. Both units carry the same 3,500-cycle rating, so cost per lifetime kWh is price per watt-hour divided by an identical number: $0.19 and $0.23, in the same order, by the same margin. The table cannot reorder these two and never could.
The years-of-life row is worse than decorative. Both units read 9.6 years daily, 33.7 weekend and 67.3 weekly, because that math counts cycles and drops capacity entirely. One of these boxes holds 6,144Wh and the other holds 1,843Wh; a cycle is not the same event on both. Read the cycle count, skip the years.
What the Specs Don't Tell You
Selected because: A 15-point noise spread, a 10-year against 6-year warranty, and two switchover figures of very different quality all need a second look.
Two of the four cards here say less than they appear to. The noise card flags the AC240P at 45dBA against a threshold of anything above 45dBA, which means it's rated exactly on the line rather than over it, and the card never mentions that the DELTA Pro Ultra's own figure is 30dBA. Neither rating states the load it was taken at, which is the part that would have mattered.
The UPS card is the other one. The AC240P's 15ms is a published switchover figure. The DELTA Pro Ultra's 0ms is a spec line, and our data uses that same zero for values that were never published, so read it as the stronger claim rather than a stopwatch result. The warranty card, by contrast, is straight and even argues against itself: 10 years against 6, at $400 a covered year against $244, with the honest note that the AC240P's better warranty-per-dollar is a fact about its price rather than its coverage.
Growth Path
Selected because: Both units take expansion batteries, and only one has the solar ceiling (5,600W against 1,200W) to refill a bigger bank.
solar input
Both units take expansion batteries, so expandability decides nothing here. What separates them is intake: 5,600W of solar input against 1,200W, roughly 4.7 times as much. Bolt batteries onto the AC240P and you still refill them through a 1,200W straw, which is the difference between a bank that recovers between cloudy days and one that doesn't.
One disclosure, because at this price it matters. We're not quoting a maximum system size for the DELTA Pro Ultra. Our sources give two different ceilings, and the larger of the two belongs to the DELTA Pro Ultra X, a different product. If a specific maximum bank size is the thing you're buying on, get it from EcoFlow in writing before you order rather than from any comparison page, including this one.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Significantly heavier (+109.8 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI AC240P
Strengths
- +Lighter by 109.8 lb
Trade-offs
- –Weaker inverter (-4,800W) limits appliance compatibility.
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
1,567Wh usable against a 2,100Wh weekend leaves the AC240P 533Wh short, a real miss rather than a rounding error. The DELTA Pro Ultra ends the same weekend at 40% used with 3,122Wh still in the tank. Both usable figures come off a flat 85% derate we apply to every unit on the site, so read them as a common yardstick, not a measurement of either box.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
DELTA Pro Ultra
Seventy-eight watt-hours. That's the entire margin by which the AC240P misses an eight-hour blackout, 1,645Wh needed against 1,567Wh usable, and it's thin enough that a slightly kinder derate would flip it. Call it a loss, but a coin's-width one. The DELTA Pro Ultra covers the same night at 31% used with 3,577Wh left over, which is a different kind of answer entirely.
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
Sixteen nights against five. Divide each unit's usable capacity by the 320Wh a CPAP night costs, 5,222Wh and 1,567Wh against 320Wh, and that's the real gap here rather than the decibel line the scoring reaches for. Ignore the 30dBA-versus-45dBA tiebreak; neither rating names a load. The honest note: if a CPAP is the entire job, five nights already outlasts most outages, and the AC240P costs $1,462 (last listed price) against $4,199.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
DELTA Pro Ultra
A 910Wh workday leaves the AC240P 657Wh in reserve and the DELTA Pro Ultra 4,312Wh. The bigger number takes the scoring, but both units finish the day with room to spare, so nobody should let this scenario move them. It's the same outcome at $1,462 (last listed price) as at $4,199.
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
AC240P
670Wh is a light ask and both clear it comfortably, with 897Wh left in the AC240P and 4,552Wh in the DELTA Pro Ultra. Then look at the parking lot: 72 lb goes in a truck bed and 181.8 lb does not. The scoring hands this to the DELTA Pro Ultra on headroom nobody at a tailgate will ever reach for.
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
DELTA Pro Ultra
4,685Wh a day is 3,118Wh more than the AC240P has to give, so this one isn't close. Watch where it leaves the winner, though. The DELTA Pro Ultra finishes at 90% used with 537Wh spare, which is a pass with nothing behind it. A full-time van build on this unit wants the expansion battery and the panels, not the base box on its own.
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: DELTA Pro Ultra runs 25.5h vs 7.6h.
$4,199 list · direct from EcoFlow
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 0–348.2hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–69.6hHigh-Draw Appliances
These reveal the real limitsscale 0–5.2h¹ 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 DELTA Pro Ultra, on Power Score margin
Take the DELTA Pro Ultra if this unit is getting installed. It's 3.3 times the energy (6,144Wh against 1,843Wh) for 2.7 times the price ($4,199 against $1,462 (last listed price)), which makes it the cheaper watt-hour at $0.65 versus $0.79, and its 7,200W continuous output is three times the AC240P's 2,400W. That's the difference between backing up a house and backing up a room, and owners have run a 3-ton central AC off that inverterA4. Here's the fence around the pick: at 181.8 lb it goes where you put it and never moves again. If the unit has to travel, the AC240P at 72 lb isn't a compromise, it's the only option, and it carries an IP65 rating with real rain and saltwater testing behind itB1B2.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 9, 2026. The links below open EcoFlow's current price.
$4,199.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated August 9, 2026
Black Friday · 38 days out
Price to beat:DELTA Pro Ultra $3,999
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
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, Solar Generator, Tailgating.
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, DELTA Pro Ultra rates 4.9/5 (95th percentile of 20 Home Backup-class units), and AC240P rates 3.9/5 (35th percentile of 27 Everyday-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.
181.8 lb is a location, not a lift
72 lb is a solo lift with a straight back and some resentment. 181.8 lb isn't a lift at all, it's a decision about where the unit lives, made once. Worth knowing that the DELTA Pro Ultra is a modular system, so its figure covers the whole assembly rather than a single carry, but 181.8 lb still has to get down the basement stairs somehow.
30dBA vs 45dBA, neither one measured under load
The AC240P is rated 45dBA and the DELTA Pro Ultra 30dBA, and neither figure carries a load condition. An idle rating tells you very little about the same fan pushing 2,400W, so take the 15-point spread as a direction rather than a measurement. The threshold is worth noticing too: 45dBA is the line this card calls disruptive for sleep, and the AC240P is rated exactly on it rather than above it.
AC240P: Power Lifting to 3,600W
The AC240P has BLUETTI's Power Lifting mode, which runs a resistive appliance rated up to 3,600W from its 2,400W 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 1,843Wh 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 Pro Ultra publishes no equivalent.
One published switchover figure, one zero
The AC240P's 15ms is a published switchover number. The DELTA Pro Ultra's 0ms is a spec line, and our data uses the same zero for genuinely instant and for never published, so treat it as the stronger claim rather than a stopwatch result. Either way the practical distance between 15ms and nothing is small. If you're choosing between these as a home UPS, choose on 7,200W against 2,400W, because that decides what the UPS is holding up in the first place.
Warranty: 10 Years vs 6
The DELTA Pro Ultra is covered for 10 years against the AC240P's 6 years. An underrated factor if you're keeping this unit for years.
Full record above — the Test Desk pick is the DELTA Pro Ultra.
Check DELTA Pro Ultra price →Ownership 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 AC240P is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the DELTA Pro Ultra works out at $0.20/kWh over its rated life. If you already own the AC240P, the hardware comparison still holds: over its rated life the DELTA Pro Ultra delivers about 21,504 kWh and the AC240P about 6,451 kWh. One thing to know reading the table: both carry the same 3,500-cycle rating, so the lifetime rows are sticker price and capacity in disguise — the wear horizon is identical and decides nothing here.
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 top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
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. LFP across the rest of the range, though rated cycle life spans 2,500 (EB3A) to 6,000, and it varies WITHIN the Elite range rather than tracking it — the Elite 300 and Elite 200 V2 are rated 6,000 while the Elite 30 V2, Elite 10 Mini, Elite 320 and Elite 400 are rated 3,000+ and the Elite 100 V2 4,000+, so 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 puts EcoFlow ahead on catalogue depth and support consistency, and BLUETTI ahead on price per watt-hour and on form factors nobody else bothers to build. This pair is that difference made physical: the install-class system on one side, the rugged portable on the other.
Growth path
DELTA Pro Ultra
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 6,144Wh.
Accepts up to 5,600W 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.
AC240P
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,843Wh.
Accepts up to 1,200W 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 BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Growth only counts if you can still buy in, and the AC240P is no longer sold (BLUETTI points owners to the AC200L). That leaves the DELTA Pro Ultra: it starts at 6,144Wh and takes EcoFlow expansion batteries, so the ceiling moves if your needs do. The AC240P's expandability still matters if you already own one, but it isn't a reason to pick it over the DELTA Pro Ultra.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA Pro Ultra
Read this ledger with one eye closed. It's a platform record covering the DELTA Pro Ultra across one-to-four-battery configurations, so not every figure in it describes this page's build. The ones that do check out: 6,144Wh per battery, 7,200W continuous and 10.8kW surge all match the spec line hereA1, and the LFP cells are rated beyond 3,500 cycles to 80%A2. Home Depot owners describe quick setup, strong solar input and good app monitoring, and report the 7,200W inverter running a 3-ton central ACA4.
Two entries don't survive that check. The 8,800W charging that tops up two batteries in about two hours is a two-battery figureA3, and this page's 6,144Wh is one batteryA1, so don't price your recharge time off it. And the claim that it runs at 0 dB for draws under 2,000WA3 sits against a 30dBA rating on the spec sheet. Something has to give there, and it isn't the spec sheet.
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
Sources
ecoflow.com · homedepot.com · autoboosting.com · ecogadgethub.com
BLUETTI AC240P
The AC240P's field record is about weather, not watt-hours. Reviewers left it outside through a six-hour rainstorm and found the interior bone dry, then ran it on a sailboat in constant saltwater spray with no moisture intrusionB2. That's the most useful thing anyone has written about this unit, and it arrives with a hard asterisk from the same coverage: IP65 holds only with every port cover closed, so running cables out of it in the rain forfeits the ratingB1.
Past the weather testing the record is thin, and what exists is reviewer work rather than long-term ownershipB2B3B4. It is at least consistent with the spec sheet: 1,843Wh, 307Wh above the standard AC240B3, LFP cells, fast charging and a large expansion ceilingB4. Nobody has published a year with this unit yet, so buy it on its ruggedness and its numbers, not on a service history that doesn't exist.
“IP65 water- and dust-resistant, but the protection applies only when all port covers are closed; using it with cables plugged in compromises the rating, and it shouldn't be used in the rain that way.”
Sources
storagereview.com · backuppowerhub.com · makeuseof.com · techradar.com · fstoppers.com · 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
- Whole-home scale (to 90kWh), 7,200W output, online UPS, silent operation under load, and industry-fast charging are the standout features. [DELTA Pro Ultra · 2 entries]
- IP65 ruggedness proven in rain and saltwater, big expandability, and fast charging are the praise; the caveat is that water resistance only holds with port covers closed. [AC240P · 3 entries]
- A1
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
ecoflow.com / homedepot.com — DELTA Pro Ultra · 2026 · [positive]
- A2
“LFP chemistry rated for over 3,500 cycles to 80% (10+ years of use).”
ecoflow.com / autoboosting.com — DELTA Pro Ultra review · 2026 · [positive]
- A3
“Industry-fast 8,800W charging tops up two batteries in about 2 hours; an online UPS protects sensitive electronics round the clock, and it runs at 0 dB (silent) for draws under 2,000W.”
ecoflow.com / ecogadgethub.com — DELTA Pro Ultra review · 2026 · [positive]
- A4
“Owners call it a powerful, easy-to-use whole-home backup with quick setup, strong solar input, and good app monitoring; its 7,200W inverter can power a 3-ton central AC.”
homedepot.com owner reviews — DELTA Pro Ultra · 2026 · [positive]
- B1
“IP65 water- and dust-resistant, but the protection applies only when all port covers are closed; using it with cables plugged in compromises the rating, and it shouldn't be used in the rain that way.”
storagereview.com / backuppowerhub.com — BLUETTI AC240/AC240P review · 2026 · [mixed]
- B2
“Real-world weatherproofing held up — left outside in a 6-hour rainstorm, water beaded off and the interior stayed bone dry; used on a sailboat with constant saltwater spray, no moisture intrusion after wiping down the exterior.”
makeuseof.com / techradar.com — AC240/AC240P review · 2026 · [positive]
- B3
“The 1,843Wh AC240P is the higher-capacity option, adding 307Wh over the standard AC240, with distinctive orange IP65 branding; a solid choice if you need the extra capacity and prefer the more visible design.”
techradar.com / fstoppers.com — AC240P review · 2026 · [positive]
- B4
“Premium end of BLUETTI's lineup; LFP battery, a fast charge reaching most of full quickly, and expandable to a very large multi-kWh bank.”
bluettipower.com / techradar.com — AC240P specifications · 2026 · [positive]
Research compiled August 9, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra if you…
- →You're backing up a house and there's a big compressor on the load list. 7,200W continuous with 10,800W surge is the only inverter here that opens that door, and owners have run a 3-ton central AC off itA4.
- →The unit is going into a garage or utility room and staying there for a decade. At 181.8 lb that isn't a preference, it's the design, and the 10-year warranty is priced for that horizon at $400 a covered year.
- →You're doing a real off-grid build. A 4,685Wh day against 5,222Wh usable is a pass with 537Wh to spare, which is thinner than it sounds, and the 5,600W solar ceiling is what makes adding batteries worth the money.
Buy the AC240P if you…
- →The unit lives outdoors, on a boat, or on a jobsite. The rainstorm and saltwater testing is the AC240P's actual featureB2, provided you accept that the covers have to be shut for any of it to countB1.
- →One person has to move it. 72 lb is a bent-knees lift into a truck bed; 181.8 lb is a phone call to a friend.
- →Your hardest day is a 910Wh workday or a 670Wh tailgate rather than a 4,685Wh van build. It clears those with 657Wh and 897Wh spare, and it does it for $1,462 (last listed price).
If neither fits
If your worst night is a fridge, a router and some lights for eight hours, both of these are more machine than the job needs and you should be looking one class down at a smaller single-box portable. And if what you actually want is whole-home backup, price a permanently installed battery with a transfer switch before spending $4,199 on a system you'll still be plugging appliances into by hand.
The Bottom Line
The DELTA Pro Ultra wins this on the least glamorous fact available: the bigger box is the cheaper energy. $0.65 a watt-hour against $0.79, with three times the continuous output stacked on top. Every scenario goes the same way, and the two that go that way for silly reasons don't undo the four that don't.
Know which question you answered, though. If it gets bolted somewhere and stays, spend the $4,199. If it's ever going in a truck bed, the AC240P is 72 lb against 181.8, it's rated IP65 with real rain and saltwater testing behind itB1B2, and $4,199 minus $1,462 (last listed price) leaves $2,737 in your pocket. Pick the location first. The specs follow from it.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro Ultra worth almost three times the price of the AC240P?
On energy alone, yes, and by a wider margin than the sticker suggests. $4,199 for 6,144Wh works out to $0.65 per watt-hour; $1,462 (last listed price) for 1,843Wh is $0.79. You're paying 2.7 times the price for 3.3 times the capacity, so the flagship is the better rate. The question worth asking instead is whether you need 6,144Wh at all, because if 1,843Wh covers your worst night then $4,199 minus $1,462 (last listed price) is $2,737 of headroom you'll never touch.
Can the BLUETTI AC240P back up my house?
Not a whole house. Its inverter tops out at 2,400W continuous with a 3,600W surge, so it backs up circuits rather than a panel. On our eight-hour blackout model it comes up 78Wh short of a 1,645Wh night, which is close, but the model still says short. The DELTA Pro Ultra's 7,200W continuous and 10,800W surge is a different category of answer, not a bigger version of the same one.
Which of these can I actually take camping?
The AC240P, without question. 72 lb is a solo lift and 181.8 lb is not something you carry to a campsite. It's also the only one of the two with weather testing behind it, having survived a six-hour rainstorm and saltwater spray with no intrusion, though that IP65 rating only holds with all the port covers closed. The catch: a 2,100Wh camping weekend is 533Wh more than its 1,567Wh usable, so bring a panel or plan a shorter trip.
Do both of these expand, and which expands better?
Both take expansion batteries, so expandability by itself is a wash. The difference is intake: the DELTA Pro Ultra accepts 5,600W of solar against the AC240P's 1,200W, roughly 4.7 times as much, and that's what determines whether a bigger bank ever refills off-grid. One honest note, though. We're not publishing a maximum system size for the DELTA Pro Ultra because our sources disagree and the largest figure in circulation belongs to a different EcoFlow model, so confirm the ceiling with EcoFlow before you buy on it.
Which one is quieter to sleep next to?
The DELTA Pro Ultra on paper, at 30dBA against 45dBA, but neither figure states the load it was measured at, so treat the 15-point spread as a direction rather than a promise. In practice the question answers itself: a 181.8 lb installed system isn't going in your bedroom and the 72 lb unit is. If sleeping near the box is the priority, plan around the AC240P's 45dBA instead of shopping for the better spec sheet.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow DELTA Pro UltraPick
$4,199.00
$4,199.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
BLUETTI AC240P
No longer sold
Prices may vary by retailer and are subject to change.