Head-to-head test
EcoFlow DELTA Pro 3 vs BLUETTI AC70
These two land within a penny of each other on cost per lifetime kilowatt-hour, so the only question that decides this page is whether your worst night runs past 653 watt-hours.
Full profiles: EcoFlow DELTA Pro 3 → · BLUETTI AC70 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$2,799.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
.webp)
$359.00 · direct from BLUETTI
Last checked 3 days ago. Prices move — check before you buy.
Spec deltas
Spend $2,399 instead of $359 and the $2,040 difference isn't buying cheaper energy. Cost per lifetime kilowatt-hour comes out at 15 cents for the DELTA Pro 3 and 16 cents for the AC70, which is a dead heat. What the money buys is one big pool instead of a small one.
Run the six load profiles this site models and the AC70 clears exactly one. It covers a 320Wh CPAP night with 333Wh of usable capacity to spare. It's 992Wh short of an 8-hour blackout at 1,645Wh, and 1,447Wh short of a camping weekend at 2,100Wh. That isn't a knock on the unit. It's a 768Wh battery being handed a 4,096Wh job.
The AC70's case is the one the scenario table can't score. 22.5 lbs is a suitcase you pick up with one hand. 112.4 lbs is a two-person lift you do once and then stop doing. If your honest worst evening is a laptop, some phones and a CPAP, the cheap unit does it and you keep the money. If it's household loads for a full evening at 1,645Wh, the AC70 is 992Wh short and careful rationing doesn't close that.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
Except none of it pools. Six AC70s are six separate 768Wh boxes with a 1,000W ceiling each, so the biggest load you can start is still 1,000W and the deepest single reserve is still 653Wh usable. The DELTA Pro 3's 4,000W continuous and 6,000W surge is the part you can't assemble out of cheaper units, and that, not the watt-hours, is what the gap between $2,399 and $359 is for.
AC70: $359 for 768Wh, 1,000W continuous output, 2,000W surgeDELTA Pro 3: $2,399 for 4,096Wh, 4,000W continuous output, 6,000W surgeAC70 usable capacity is 653Wh after the flat 0.85 factor
Why it mattersIf your problem is many small loads spread across a day, buy watt-hours cheaply. If it's one big load or one deep reserve, you are buying a single pool, and only one of these sells you that.
Now add a unit that refills in under an hour on Turbo ACB2 and that miss has a free fix: find an outlet at some point in the day. The AC70's real failures are the ones measured in the high hundreds and thousands, 992Wh short on the blackout row and 1,447Wh short on the camping row, where the shortfall is larger than the battery and nothing you do during the day closes it.
Tailgate Party needs 670Wh; the AC70 has 653Wh usable and is 17Wh short653Wh is 768Wh multiplied by 0.85, a flat usable factor applied to every unit rather than a measurement of this batteryTurbo AC charging refills the AC70 in under an hour, and pass-through lets it charge while powering devicesB2
Why it mattersJudge the AC70 on the thousand-watt-hour misses, not the seventeen. If your worst day stays under 653Wh and has a wall outlet somewhere in it, the cheap unit is the right unit.
The same decision governs the other half of the risk. Our brand assessment puts BLUETTI's support as the most inconsistent in the category and records that buying direct tends to produce the better outcomes, so the listing that costs you two years of cover is also the one that complicates the claim if you ever need it. Nothing about the DELTA Pro 3's five years depends on where you shop.
Both units are recorded at 5 warranty years, and the warranty card reads that as no differenceThe AC70 carries 3 years standard plus an automatic 2-year extension when bought from BLUETTI's official site, for up to 5 years totalB3The DELTA Pro 3's 5 years carries no purchase-channel condition
Why it mattersIf you're taking the AC70, buy it from BLUETTI directly. It's the difference between three years of cover and five, and it costs nothing.
rated cycles
What it can't show is that one deal is roughly seven times the size: 16,384 kWh against 2,304 kWh across their rated lives. The lifespan row hides it too, because 11 years of daily cycling against 8.2 says nothing about cycle size, and a daily cycle moves 4,096Wh on one unit and 768Wh on the other.
Cost per lifetime kilowatt-hour: $0.15 for the DELTA Pro 3, $0.16 for the AC70The DELTA Pro 3 is 59 cents per watt-hour over 4,000 cycles; the AC70 is 47 cents per watt-hour over 3,000Rated lifetime output is 16,384 kWh for the DELTA Pro 3 and 2,304 kWh for the AC70
Why it mattersUse the lifetime table to confirm neither unit is a bad way to buy stored energy, then set it aside. It cannot answer the question you came here with.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: The AC70 clears one of the six load profiles modelled here, and where it misses it misses by 992Wh and 1,447Wh. That is the decision.
One blind spot to hold in mind across every row: the model scores Weekend Camping and Tailgate Party as though both units drove themselves to the site. At 112.4 lbs the DELTA Pro 3 goes where you set it and stays there, and it sweeps both of those rows on watt-hours while being the harder box to actually get to a campsite. Read them as has enough power, not as is the right thing to bring.
The row worth arguing with is Tailgate Party. The AC70 needs 670Wh and has 653Wh usable, so it fails by 17Wh. That 653 is 768Wh times the flat 0.85 usable factor applied to every unit on this site, not a measurement of this particular battery, which puts the 17Wh gap well inside the width of the assumption it's measured against. Everywhere else the AC70 loses, it loses by hundreds or thousands of watt-hours, and those are the rows to trust.
Portability & Form Factor
Selected because: 22.5 lbs against 112.4 lbs is the one axis where the cheaper unit wins outright, and it settles more purchases than watt-hours do.
weight
Five AC70s weigh 112.5 lbs. The DELTA Pro 3 weighs 112.4. That coincidence is the whole portability section: 22.5 lbs against 112.4 lbs, and the only axis on this page where the price gap runs backwards. The cheap unit does something the expensive one physically cannot, which is get carried out to a back seat with one hand.
This decides more purchases than capacity does. A 112.4-lb box gets moved into a basement or a garage once and then lives there, which makes the DELTA Pro 3 a house appliance that happens to be unplugged. The AC70 can be at a campsite, a tailgate and a spare bedroom inside the same month. If the unit has to move, the scenario table is answering a question you don't have.
Lifetime Value
Selected because: 15 cents against 16 cents per lifetime kilowatt-hour, worth showing precisely because it refuses to separate them.
cost / lifetime kWh
15 cents against 16 cents per lifetime kilowatt-hour is a dead heat, and it stays one because the figure is dollars per watt-hour divided by cycles. The DELTA Pro 3 is 59 cents a watt-hour across 4,000 cycles; the AC70 is 47 cents across 3,000. Cheaper entry, fewer cycles, same landing spot. This table cannot separate these two and shouldn't be asked to.
The lifespan row needs its own caveat. 11 years of daily use against 8.2 has no capacity term in it at all, and a daily cycle moves 4,096Wh on one unit and 768Wh on the other, so those are not the same year. The figure that carries the real difference is total rated output: 16,384 kWh against 2,304 kWh.
Growth Path
Selected because: One unit has a documented 48kWh expansion ceiling and 2,000W of solar to refill it. The other has 500W of solar and no ceiling we can verify.
solar input
Both units are recorded as expandable, but only one has a ceiling anyone has put a number on. The DELTA Pro 3's published expansion ceiling is 48kWhA1. Our record marks the AC70 expandable too and holds no figure for how far, and we're not going to invent one. Until there's a verified ceiling, treat the AC70's expandability as a checkbox rather than a plan.
The stronger growth argument is the panel ceiling anyway: 2,000W of solar input against 500W. A bigger bank only helps if you can refill it, and 500W feeding an expanded bank is a bottleneck you'd hit in the first cloudy week. One flag on the DELTA Pro 3 figure before you buy panels around it: one of our review-desk sources puts its solar input at up to 2,600WA3 against the 2,000W we hold, and we've argued from the lower number throughout.
What the Specs Don't Tell You
Selected because: Two of the cards below need reading against their own numbers, starting with a 45dB noise warning aimed at a unit rated 45dB.
rated cycles
Two of the cards below need a footnote. The noise card fires on the AC70 at 45dB and then reports that anything above 45dB disrupts sleep, which excludes its own subject by a decibel, and it never mentions that the DELTA Pro 3 is rated 30dB. Both numbers are ratings under load. A CPAP night is 320Wh across eight hours, roughly 40W against inverters rated 1,000W and 4,000W, so neither unit is likely to be sitting at its rated figure while you sleep.
The UPS card is the more useful of the two and still wants careful reading. 10ms and 20ms are both rated switchover ceilings rather than stopwatch results, and both sit inside what a desktop PC, a router or a NAS rides through without noticing. The 10ms figure is the better one. It is not, by itself, worth the difference between $2,399 and $359.
Strengths & trade-offs
EcoFlow DELTA Pro 3
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$2,440) than the AC70.
- –Significantly heavier (+89.9 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI AC70
Strengths
- +Costs $2,440 less
- +Lighter by 89.9 lb
Trade-offs
- –Weaker inverter (-3,000W) limits appliance compatibility.
- –Sealed capacity — the DELTA Pro 3 can add batteries to grow past 768Wh; this one can't.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA Pro 3's 4,000, so it wears out sooner.
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
2,100Wh ends this one. The AC70 has 653Wh usable and comes up 1,447Wh short, which isn't a rationing problem, it's a wrong-size problem. The DELTA Pro 3 covers the weekend and still holds 1,382Wh in reserve. Worth remembering what you carry to the site to get that reserve: 112.4 lbs, in two pairs of hands.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
DELTA Pro 3
The DELTA Pro 3 finishes the eight hours with 1,837Wh left, which is most of a second outage. The AC70 supplies 653Wh of the 1,645Wh this row asks for and stops. If your blackout plan is household loads for a full evening rather than topping up a phone and a lamp, this row is the entire argument for the bigger unit.
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
DELTA Pro 3
Both units run the 320Wh night, so the real question is night two. The AC70 ends with 333Wh of its 653Wh usable, which is one more night and nothing after it. The DELTA Pro 3 spends 320Wh of 3,482Wh and could do this ten nights running. For a one-evening cut either is fine. For a multi-day outage with a CPAP in it, only one of them is.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
DELTA Pro 3
910Wh for a day of work, and the AC70 lands 257Wh short of it. That's the closest thing to a fair fight on this page and the AC70 still loses, because 768Wh derated to 653Wh usable doesn't quite cover a full working day. The DELTA Pro 3 finishes with 2,572Wh spare, enough for two more days like it with change.
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
Neither unit
The DELTA Pro 3 takes this row on the arithmetic, and the arithmetic is thinner than it looks. The AC70 needs 670Wh and has 653Wh usable, a 17Wh miss, and that 653 is 768Wh times the flat 0.85 usable factor applied to every unit here rather than a measurement of this battery. If tailgating is the job you're actually buying for, don't let 17Wh talk you out of the 22.5-lb unit.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
Neither box does this. 4,685Wh is a real off-grid day, and the DELTA Pro 3 is 1,203Wh short of it while the AC70 is 4,032Wh short. Those are different kinds of no: one is a unit that needs expansion batteries bolted on, the other is a unit in the wrong weight class entirely. If this is your day, you're shopping above both.
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 3 runs 17h vs 3.2h.
$2,799 list · direct from EcoFlow
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–232.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–46.4hHigh-Draw Appliances
These reveal the real limitsscale 0–3.5h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
August 9, 2026
Verdict: the DELTA Pro 3, on Power Score margin
Take the DELTA Pro 3 if your worst night runs past 653Wh, which is the AC70's usable ceiling after the flat 0.85 derate applied to every unit here. It wins five of the six load profiles on this page, holds 3,482Wh usable against 653Wh, starts loads the AC70 cannot at 4,000W continuous and 6,000W surge, and is fractionally the cheaper unit to own at 15 cents per lifetime kilowatt-hour against 16. Confidence sits at seven rather than nine because the win is about size, not quality. A large share of people who land on this comparison have loads the AC70 covers comfortably, and for them the $2,040 between $2,399 and $359 is better left unspent.
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.
$2,799.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
or check the AC70 price$359.00 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, Home Backup, CPAP, Tailgating, Food Truck, 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 Pro 3 rates 4.0/5 (40th percentile of 16 Home Backup-class units), and AC70 rates 4.8/5 (89th percentile of 20 Compact-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.
DELTA Pro 3: 112.4 lbs Is a Commitment
At 112.4 lbs, this is a two-person lift. Plan your placement carefully. Once it's set up, you won't want to move it. It's a semi-permanent appliance. Pick your spot.
Fan Noise: 45dB vs 30dB, Both Rated Under Load
The AC70 is rated 45dB and the DELTA Pro 3 is rated 30dB, and both figures describe the fan under load rather than what you'd hear at three in the morning. A CPAP night is 320Wh across eight hours, roughly 40W, against inverters rated 1,000W and 4,000W, so neither unit is likely to be running at its rated figure while you sleep. If the box lives in the bedroom, the 30dB rating is the safer one to buy. If it lives in a garage, this row decides nothing.
AC70: Fixed Capacity
The AC70 is sealed at 768Wh — fine if that covers you, but it's the ceiling. By contrast the DELTA Pro 3 can add expansion batteries, so if your needs grow past 768Wh it has somewhere to go the AC70 doesn't — and at this size that path genuinely points toward partial-home backup.
Surge Power: Ratio and Ceiling Disagree
The AC70 holds the higher surge-to-continuous ratio (2× vs 1.5×), but the DELTA Pro 3 holds the higher absolute surge ceiling — 6,000W against 2,000W. These measure different things. The ratio says how much headroom an inverter keeps above its own rating; the ceiling says how big a startup spike it can actually swallow. A motor draws a number of watts at switch-on, not a multiple of someone else's rating, so on raw starting ability the DELTA Pro 3 is the stronger unit here — while the AC70 is the one running further below its own limit at steady state.
UPS Switchover: 10ms vs 20ms, Both Rated Ceilings
The DELTA Pro 3 is rated to switch to battery within 10ms and the AC70 within 20ms. Both are manufacturer ceilings rather than measurements taken with a stopwatch, and both sit inside what a desktop PC, a router or a NAS will ride through without dropping. The 10ms figure is the better one. It is not, on its own, worth the difference between $2,399 and $359.
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 AC70 works out at 13.9 years of cover per $1,000 spent against the DELTA Pro 3's 1.8, but that spread is the price gap, not the terms.
Cycle Life: 4,000 vs 3,000, But Not the Same Cycle
The DELTA Pro 3 is rated for 4,000 cycles and the AC70 for 3,000, which reads as 11 years against 8.2 at daily use. Those years hide the size of the cycle. A full cycle moves 4,096Wh on the DELTA Pro 3 and 768Wh on the AC70, so across their rated lives one delivers 16,384 kWh and the other 2,304. Both comfortably outlast their 5-year warranties, and neither battery dies at the cycle limit. It settles around 80% of original capacity and keeps working.
Full record above — the Test Desk pick is the DELTA Pro 3.
Check DELTA Pro 3 price →or check the AC70 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
Both units have similar long-term ownership costs ($0.17/kWh vs $0.16/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off.
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
EcoFlow prices mid-to-premium and BLUETTI prices at value, and this pair is that difference at full stretch: $2,399 against $359. Both run deep lineups, so whichever brand you pick there's a bigger or smaller unit in the same family when your needs change. The brand column is doing less work than usual here, because these two boxes aren't competing for the same job.
Growth path
DELTA Pro 3
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 4,096Wh.
Accepts up to 2,000W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
AC70
FIXED CAPACITYFixed at 768Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Adequate ports for most setups, but heavy users may want a power strip.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
The AC70 is sealed at 768Wh, which is fine if that covers you. The DELTA Pro 3 starts at 4,096Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the AC70 doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA Pro 3
There's no long-term ownership record on the DELTA Pro 3 yet. What exists is review-desk coverage: the capacity, output and 48kWh expansion ceiling as publishedA1, a 4,000-cycle LFP pack with an IP65 battery ratingA2, and a handled weight of about 113.5 lbsA4, close enough to the 112.4 lbs we hold to call it the same box. Nobody in this record has lived with the unit through a winter, so treat the durability picture as unwritten rather than good.
One conflict worth flagging before you plan solar around it. A review-desk source puts the DELTA Pro 3's solar input at up to 2,600W, alongside a 0 to 80% recharge in about 50 minutesA3, while the spec we hold is 2,000W of solar. We've used 2,000W everywhere on this page. If solar input is the deciding spec for you, confirm it against EcoFlow's own documentation before you commit to a panel array.
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
Sources
ecoflow.com · amazon.com · homedepot.com · thepowerpick.com · outboundpower.com · techradar.com · thesolarlab.com
BLUETTI AC70
The AC70's record is also review desks rather than multi-year owners, but it's more hands-on. Fan behaviour is the recurring note: quiet under light loads, ramping to something noticeable but not obnoxious when pushed hard, described as comparable to an older laptop or a gaming PC workingB1. That fits the 45dB rating being a load figure rather than an idle one.
Two practical findings sit behind the specs. Turbo AC charging refuels it in under an hour and pass-through works cleanly, so it can take AC, solar or car input while it powers devicesB2. And the warranty is structured as 3 years standard with an automatic 2-year extension for buying from BLUETTI's own siteB3, which is the detail that makes the five-year parity on this page conditional. No faults surfaced during that testingB3.
“Under light loads the fan is quiet, but push past heavier output and it ramps up to a noticeable but not obnoxious level — comparable to an old laptop or gaming PC under load.”
Sources
backuppowerhub.com · root-nation.com · phonearena.com · trustedreviews.com · myoutdoorbasecamp.com · thedigitalstory.com · kenrockwell.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Huge 4,096Wh LFP capacity, 4,000W dual-voltage output, very fast charging, and big expandability are the standout praise; it's heavy at ~113 lbs. [DELTA Pro 3 · 2 entries]
- Fast charging, compact portability, and strong value are the consistent praise; fan noise rises under heavier load but isn't considered intrusive. [AC70 · 2 entries]
- A1
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
ecoflow.com / amazon.com — DELTA Pro 3 · 2026 · [positive]
- A2
“LiFePO4 rated for 4,000+ cycles to 80% (10+ years), with an IP65 battery rating.”
homedepot.com / thepowerpick.com — DELTA Pro 3 review · 2026 · [positive]
- A3
“Multi-charge technology reaches 0-80% in about 50 minutes using up to 7,000W input, with a full charge in roughly 90 minutes; up to 2,600W solar.”
outboundpower.com / techradar.com — DELTA Pro 3 review · 2026 · [positive]
- A4
“Weighs about 113.5 lbs; reviewers call it a gold-standard whole-home backup unit for 2026.”
techradar.com / thesolarlab.com — DELTA Pro 3 review · 2026 · [positive]
- B1
“Under light loads the fan is quiet, but push past heavier output and it ramps up to a noticeable but not obnoxious level — comparable to an old laptop or gaming PC under load.”
backuppowerhub.com / root-nation.com — BLUETTI AC70 review · 2025-2026 · [mixed]
- B2
“Fast AC charging via Turbo mode refuels it in under an hour, and pass-through charging works smoothly — you can charge via AC, solar, or car while simultaneously powering devices.”
phonearena.com / trustedreviews.com — AC70 review · 2025-2026 · [positive]
- B3
“No issues reported during testing; backed by a 3-year standard warranty plus an automatic 2-year extension when purchased from BLUETTI's official site, for up to 5 years total.”
backuppowerhub.com / myoutdoorbasecamp.com — AC70 review · 2025-2026 · [positive]
Research compiled August 9, 2026.
Who Should Buy Which
Buy the DELTA Pro 3 if you…
- →You want the box to sit in one place and be the house's backup. 112.4 lbs is a two-person lift you do once, and after that it's an appliance you plug things into.
- →Your worst night runs past 653Wh. An 8-hour blackout at 1,645Wh and a camping weekend at 2,100Wh are the ordinary reasons people buy a power station, and they're exactly the rows the AC70 loses by 992Wh and 1,447Wh.
- →You need to start something big. 4,000W continuous with 6,000W of surge is the spec that no quantity of cheaper units adds up to.
- →You expect your needs to grow. 48kWh is a published ceilingA1 and 2,000W of solar input is enough to keep a bank that size fed.
Buy the AC70 if you…
- →Your loads are a laptop, phones and a CPAP. A CPAP night is 320Wh and the AC70 finishes it with 333Wh still in hand.
- →The unit has to travel. 22.5 lbs goes into a back seat one-handed; the other box on this page doesn't go anywhere without a second person.
- →You'll usually have somewhere to plug in. Turbo AC charging refills it in under an hourB2, which turns a 653Wh usable ceiling into 653Wh more than once a day.
- →The $2,040 between $2,399 and $359 has a better job elsewhere, whether that's panels, a second unit later, or staying in your account.
If neither fits
If your day looks like the Van Life row at 4,685Wh, close the tab. The DELTA Pro 3 is 1,203Wh short of it and the AC70 is 4,032Wh short, and the honest answer is a larger station, or a DELTA Pro 3 with expansion batteries attached, rather than either of these as they ship. The same applies if you're here because a search engine put the two side by side: a $359 22.5-lb carry unit and a $2,399 112.4-lb appliance aren't two answers to one question.
The Bottom Line
Take the DELTA Pro 3 if your worst night runs past 653Wh. Take the AC70 if it doesn't. The AC70 clears one of the six load profiles modelled here and its misses aren't close: 992Wh short on the blackout, 1,447Wh short on the camping weekend. No amount of careful use closes a gap bigger than the battery.
The number to keep is the one that refuses to pick a side. 15 cents against 16 cents per lifetime kilowatt-hour means neither of these is a poor way to buy stored energy, so this was never a value decision. It was whether you need one pool of 3,482Wh or 653Wh will do, and whether the box ever has to leave the house. Answer those two and the price stops being interesting.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro 3 worth $2,399 when the AC70 is $359?
Only if you need more than 653Wh at a stretch, or more than 1,000W at once. Those are the two things the AC70 physically can't do, and they're what the $2,040 difference between $2,399 and $359 buys. On cost per lifetime kilowatt-hour the two are a dead heat at 15 cents and 16 cents, so you aren't paying a premium for worse value. You're paying for scale you may or may not need.
Can the BLUETTI AC70 get me through an 8-hour blackout?
Not the one modelled here. That row needs 1,645Wh and the AC70 has 653Wh usable, leaving it 992Wh short. It will carry a modest set of loads for part of an evening, and 500W of solar input can extend that in daylight. As a standalone eight-hour reserve it isn't one.
Which one is quieter?
The DELTA Pro 3 on the ratings, at 30dB against the AC70's 45dB. Both are load ratings rather than idle ones, and a CPAP at roughly 40W (320Wh over eight hours) is light duty for a 1,000W or a 4,000W inverter. Review-desk testing describes the AC70's fan as quiet at light loads and only noticeable when pushed hard. If the unit sleeps in the bedroom, take the 30dB rating; if it lives in a garage, this isn't a deciding spec.
Do both really come with a 5-year warranty?
Both are recorded at 5 years, but the AC70's is 3 years standard plus an automatic 2-year extension for buying from BLUETTI's own site. Buy it from a marketplace listing and you may be looking at 3. The DELTA Pro 3's 5 years carries no such condition, so if the AC70 is your pick, buy it direct.
Can I add batteries to the AC70 later?
Our record lists the AC70 as expandable but holds no verified ceiling for it, so we won't quote one. The DELTA Pro 3's expansion ceiling is published at 48kWh. If planned growth is part of your decision, that asymmetry matters more than the base capacities, because one of these units has a documented path and the other has a checkbox. Confirm the AC70's expansion options against BLUETTI's own documentation before you count on them.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow DELTA Pro 3Pick
$2,799.00
$2,799.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
BLUETTI AC70
$359.00
$359.00 · direct from BLUETTI
Last checked 3 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.