Head-to-head test
EcoFlow DELTA Pro vs BLUETTI AC70
One of these is a 22.5 lb box you carry with one hand; the other is 99 lbs that stays wherever you set it down, and the only thing deciding between them is whether a day of your loads fits inside 653 usable watt-hours.
Full profiles: EcoFlow DELTA Pro → · BLUETTI AC70 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
The DELTA Pro holds 3,600Wh and weighs 99 lbs. The AC70 holds 768Wh and weighs 22.5 lbs. These two aren't really rivals, they're two different answers to two different questions, and the comparison that brought you here is mostly asking which question is yours.
Across the six loads we model, the AC70 finishes one: a CPAP night, which it covers comfortably. It comes up 992Wh short of an eight-hour blackout, 1,447Wh short of a camping weekend, and 257Wh short of a remote workday. The DELTA Pro takes four of the six and clears that blackout with 1,415Wh still in the pack.
What surprises people is the money. The $1,540 between them buys 2,832Wh more battery (3,600 against 768) and costs you 76.5 more pounds to move (99 against 22.5), but it doesn't buy energy at a better rate. Over the rated life of each pack the two land a penny apart per kilowatt-hour. So the AC70 isn't the value play and the DELTA Pro isn't the indulgence. You're paying the same rate either way and choosing how much of it to buy.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
solar input
So the usual penalty for buying big, where you spend the whole day refilling what you drained overnight, doesn't apply here. In a multi-day outage the DELTA Pro banks an entire 1,645Wh evening and takes it back in a morning, while the AC70 refills faster per watt-hour and still misses the evening it just failed by 992Wh. Recharge speed only starts to matter after capacity clears the load.
DELTA Pro: 3,600Wh capacity, 1,600W maximum solar inputAC70: 768Wh capacity, 500W maximum solar input8-Hour Blackout: 1,645Wh needed, the AC70 is 992Wh short, the DELTA Pro finishes with 1,415Wh spare
Why it mattersIf you're buying for outages, stop comparing charge times. Check whether the pack covers a day first, because the bigger pack here refills on the same kind of schedule as the small one.
continuous output
That kills the most common reason people talk themselves into the bigger box. The DELTA Pro isn't winning because it starts appliances the AC70 stalls on, since in these scenarios it never has to. It wins because 3,060Wh usable carries a 1,645Wh evening with 1,415Wh left over, and 653Wh doesn't reach the end of the first one.
AC70: 1,000W rated output against 2,000W surge, exactly 2:1DELTA Pro: 3,600W rated output against 7,200W surge, the same 2:1The largest peak in any modelled scenario is the 400W Tailgate Party, and both units start and sustain it
Why it mattersDecide this on watt-hours, not watts. Add up a day of your loads, and if the total sits under about 650Wh, the AC70's 1,000W ceiling will never be the thing that fails you.
cost / lifetime kWh
What it does settle is the framing the sticker invites. Neither unit is the bargain and neither is the premium: you pay the same rate and choose the quantity, which works out to about five and a half times more delivered energy from the DELTA Pro (12,600 divided by 2,304). Neither pack will be retired by its cells inside a decade of daily cycling, so this is a capacity decision wearing a price tag.
DELTA Pro: 3,600Wh over 3,500 rated cycles is 12,600 kWh delivered, $0.15 per lifetime kWhAC70: 768Wh over 3,000 rated cycles is 2,304 kWh delivered, $0.16 per lifetime kWhBoth records carry a 5-year term, and cycled daily their rated lives run 9.6 and 8.2 years
Why it mattersAnyone deciding by sticker price should stop and price the watt-hours instead, then buy whichever unit covers them.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Four of the six loads we model separate these two outright, and the AC70's misses run from 17Wh to 4,032Wh rather than a few percent.
The AC70 doesn't fade as loads grow, it stops. It clears a CPAP night and gets within 17Wh of a tailgate afternoon, then it's 257Wh short of a remote workday, 992Wh short of an eight-hour blackout and 1,447Wh short of a camping weekend. Batteries don't degrade gracefully across a scenario. They finish or they don't, and where that line falls for the AC70 is somewhere just above a tailgate.
The tailgate row is the one worth reading twice, because it's the closest thing to a fair fight on the page. The AC70's nameplate 768Wh clears that 670Wh afternoon outright; it's the flat 15% conversion allowance we apply to every unit that drops it to 653Wh usable and tips it 17Wh under. Unplug one thing across the day and it finishes. That's the honest shape of this unit's limit: it isn't far off the loads at the small end, it's just that most of the reasons people go shopping for a power station live at the other end.
Portability & Form Factor
Selected because: 99 lbs against 22.5 lbs is the counterweight to every capacity argument here, and it's the one figure more money can't improve.
weight
Seventy-six and a half pounds is the real difference between these two, and it's the only one that spending more can't fix. The AC70 at 22.5 lbs is a one-hand lift to a picnic table, a trunk, a fourth-floor walkup. The DELTA Pro at 99 lbs is a thing you decide where to put, and then it lives there. Our spec record doesn't track wheels or a telescoping handle, and at this weight that detail changes the job completely, so look at the product photos before you plan on carrying it from the car. The accounts of an integrated handle describe the DELTA Pro line rather than this specific unit, and our own research flags that coverage as conflated with the later Pro 3A0A2.
Weight also decides the CPAP row, the one scenario the AC70 wins outright. Both units cover a 320Wh night without effort, the DELTA Pro using 10% of itself to do it. The reason to prefer the small one there is that it sits on a nightstand at arm's reach instead of taking floor space beside the bed. That's a placement argument, not a capacity one, and it's the only kind of argument the AC70 needs to win.
Lifetime Value
Selected because: $0.15 against $0.16 per lifetime kilowatt-hour: the two are a penny apart, so cost of energy can't break this tie.
cost / lifetime kWh
A penny. That's the whole difference in what these two cost per kilowatt-hour across the rated life of their packs, and it should end any theory that the small one is the thrifty choice. 3,600Wh over 3,500 rated cycles works out to 12,600 kWh of delivered energy; the AC70's 768Wh over 3,000 cycles gives 2,304 kWh. The money divides across those totals at nearly the same rate, and both cycle counts are minimums, so both figures are conservative.
What the metric can't tell you is whether you'll ever collect on it. Cycled daily, the DELTA Pro's rated life runs about 9.6 years and the AC70's about 8.2, close enough that cells won't be what retires either one. The gap that matters is what they deliver in the meantime, which is about five and a half times more energy from the DELTA Pro over the same rated life. That's what the money buys: not a better rate, more of it.
Growth Path
Selected because: The AC70 is sealed at 768Wh and the DELTA Pro takes expansion batteries, but its 3,600Wh base had already settled the question.
solar input
The DELTA Pro's base pack is 4.7 times the AC70's entire capacity (3,600Wh against 768Wh), which quietly retires the argument this section usually turns on. Expansion batteries are a real advantage for a buyer whose daily load already runs past 3,600Wh. They're irrelevant to a buyer weighing 3,600Wh against 768Wh, because that reader hasn't reached the question yet.
The AC70 being sealed isn't a mark against it either. 768Wh in a 22.5 lb box is the complete form of what this unit is trying to be, and a fixed ceiling only counts as a loss when the capacity you can't reach would have beaten the rival's. There's exactly one place on this page where growth earns its keep: the van-life load at 4,685Wh a day, which the DELTA Pro misses on its own by 1,625Wh. That buyer should care that one of these takes extra batteries. Nobody else here should.
Strengths & trade-offs
EcoFlow DELTA Pro
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$1,540) than the AC70.
- –Significantly heavier (+76.5 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Can receive complaints about fan noise under heavy load.
BLUETTI AC70
Strengths
- +Costs $1,540 less
- +Lighter by 76.5 lb
Trade-offs
- –Weaker inverter (-2,600W) limits appliance compatibility.
- –Sealed capacity — the DELTA Pro can add batteries to grow past 768Wh; this one can't.
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
DELTA Pro
The AC70 doesn't finish — 653Wh usable against the 2,100Wh this needs leaves it 1,447Wh short, about 31% of the scenario covered. The DELTA Pro covers it with 960Wh to spare.
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
The AC70 doesn't finish — 653Wh usable against the 1,645Wh this needs leaves it 992Wh short, about 40% of the scenario covered. The DELTA Pro covers it with 1,415Wh to spare.
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 cover that without noticing. The AC70 spends 49% of its usable energy on the night and keeps 333Wh back, which is a second night with 13Wh to spare and no third. The DELTA Pro spends 10% and gets nine nights out of its 3,060Wh usable. The AC70 takes this row because at 22.5 lbs it belongs on the nightstand rather than the floor, but if the reason you're asking is a multi-night outage, count the nights before you decide. On fan noise, each maker publishes its own rating and neither measured it at a 40W draw, so go find hands-on reports before either unit sleeps next to you.
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
The AC70 doesn't finish — 653Wh usable against the 910Wh this needs leaves it 257Wh short, about 72% of the scenario covered. The DELTA Pro covers it with 2,150Wh to spare.
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 Pro
The AC70's nameplate 768Wh clears this 670Wh afternoon; it's the flat 15% conversion allowance we apply to every unit that takes it to 653Wh usable and leaves it 17Wh under. That's a gap you close by unplugging one thing before halftime. Both units start and hold the 400W peak without straining, so power was never the issue. The DELTA Pro takes the row with 2,390Wh untouched, which tells you it was never really in this fight.
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 unit does this, and it isn't close. 4,685Wh a day is 153% of the DELTA Pro's usable energy and 718% of the AC70's, leaving the big unit 1,625Wh short about two-thirds of the way through the day and the small one covering 14% of it. If this is your load, the answer isn't on this page: it's a substantially larger station, or the DELTA Pro with expansion batteries behind it, which is the one path to that number either of these can offer.
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 runs 14.9h vs 3.2h.
$1,899 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 0–204hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–40.8hHigh-Draw Appliances
These reveal the real limitsscale 0–3.1h¹ 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 DELTA Pro, on Power Score margin
Take the DELTA Pro if the reason you're shopping is an outage or a weekend away from a socket, because it's the only one of these two that finishes either, and it asks no more per kilowatt-hour over the rated life of its pack to do it. The catch is 99 lbs and a base you'll mostly leave unused on small jobs: it spends 10% of itself on a CPAP night. The AC70 is the right buy, not the consolation prize, for anyone whose whole list fits inside 653Wh of usable energy and who genuinely needs to move the thing, which is most people shopping for a phone, a laptop, a camera kit and a breathing machine. What should not decide this is the sticker, because per unit of energy delivered these two land a penny apart.
Today the DELTA Pro is $1,799, $100 under its typical $1,899. The verdict weighs typical prices, not today's. Prices checked 28 days ago.
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.
$1,799.00 · direct from EcoFlow
down from $1,899 · 5% below usual
Last checked 28 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 September 19, 2026
Black Friday · 26 days out
Prices to beat:DELTA Pro $1,599AC70 $359
The lowest we have recorded for each. We have never seen the AC70 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): 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 rates 3.7/5 (26th percentile of 20 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.
99 lbs Is a Placement Decision
Ninety-nine pounds isn't a carry, it's where the unit is going to live. Two hands, bent knees, and not on stairs, against 22.5 lbs of AC70 you pick up with one hand on the way out the door. Our spec record doesn't track wheels or a telescoping handle, and at this weight they change the job completely, so check the product photos before you plan on moving this one from the car to the campsite.
Fan Noise: Two Published Ratings
The AC70 is rated 45dB (like a running refrigerator), the DELTA Pro 60dB (like a normal conversation). Neither is a measurement on a shared bench — they are two makers' figures, each measured its own way, so a low number and a high one can describe the same machine at different moments. Take the pair as a prompt to find hands-on reports rather than as a gap you can act on. For most people, fan noise around 45dB and up is where sleep starts to suffer, and neither figure tells you what either unit does at a 40W draw.
Sealed at 768Wh, and That's Fine Here
The AC70 can't add capacity, which matters less on this page than it looks. The DELTA Pro's advantage isn't that it expands, it's that its base pack is 4.7 times the AC70's entire capacity before you bolt anything on. A fixed ceiling only counts as a loss when the capacity you can't reach would have beaten the rival's, and 768Wh in a 22.5 lb box is the complete form of what this unit is for. Expansion becomes a real argument for exactly one buyer: the one whose daily load already runs past 3,600Wh.
AC70: Power Lifting to 2,000W
The AC70 has BLUETTI's Power Lifting mode, which runs a resistive appliance rated up to 2,000W from its 1,000W 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; for motor loads the figure to read is the AC70's separate 1,500W surge peak, not this one. And it is not a reason to size down, because running a load that big from 768Wh 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 publishes no equivalent.
Surge Power: Inverter Quality Indicator
The DELTA Pro has a 2× surge-to-continuous ratio vs the AC70's 1.5×, and the higher absolute ceiling with it — 7,200W against 1,500W. At 2× it clears the 2× rule of thumb for absorbing motor startups — fridges, AC compressors and power tools briefly draw 2-3× their rated wattage. What decides whether a given motor starts is the ceiling, not the ratio: the AC70 still surges to 1,500W, so check the startup draw of the heaviest thing you plan to run against that figure rather than assuming it trips.
Same Five Years, One of Them Conditional
Both records carry a five-year term, so coverage isn't a tiebreaker. The AC70's five is a maximum rather than a baseline: it holds if you buy direct from BLUETTI or register the unit, and a reseller purchase carries a shorter term. Ignore any cover-per-dollar version of this comparison, too. On a pair separated by this much battery, it just restates the size difference in warranty clothing and tells you nothing about the terms themselves.
Full record above — the Test Desk pick is the DELTA Pro.
Check DELTA Pro 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
The AC70 is cheaper to buy, but the DELTA Pro is cheaper to own. At $0.15/kWh over its lifetime vs $0.16/kWh, the DELTA Pro's higher cycle life and capacity make each dollar go further over the years.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the 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
EcoFlow offers no parts and no service once the warranty is out, which is worth pricing into a unit you intend to cycle for the better part of a decade. Its support record is polarized: some claims close with a prepaid replacement label, others drag on and end with a refurbished unit against a new-unit claim. Buying through a retailer with its own generous returns window is the cheap insurance here.
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
Buy this one direct. BLUETTI's support is the most uneven in the category, third-party purchase claims are where it goes worst, and the fifth year of the warranty is itself conditional on buying direct or registering. The app is the compensation: it's tied for the best-rated in the category.
Analyst note
Neither brand's service record is a reason to choose it, so weigh it by consequence instead of by reputation. A compact unit that fails is a small problem and a replaceable one. A 3,600Wh platform that fails is a claim you'll be working for weeks, and EcoFlow doesn't service units out of warranty at all. That asymmetry argues for keeping a paper trail on the larger purchase: buy where returns are easy, register it, and keep the receipt somewhere you'll find it in year four.
Growth path
DELTA Pro
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,600Wh.
Accepts up to 1,600W 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 starts at 3,600Wh 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
The field record on this unit comes with an asterisk, and it's worth stating first: much of the available coverage conflates the original DELTA Pro with the later, heavier Pro 3, so the measured figures inside it aren't safe to attach to the box on this pageA0. What does carry across is character. It has been used as genuine home backup through repeated overnight outages over a span of months, running fridge-and-lighting loads as the primary sourceA1A3, and it's long been treated as a reference point for high-draw appliance backup and large-scale expansionA1. The consistent knock is the fans: past heavy draws they give off a high-pitched whine that's distracting in a quiet room, though lighter loads stay quieterA4. Take the wheels-and-handle accounts the same way, as line-level character rather than a spec for this SKUA2.
“Long regarded as a gold standard for home backup — designed for high-draw appliances and full-scale battery expansion, running home essentials like a fridge, lighting, and a space heater through outages.”
Sources
backuppowerhub.com · us.ecoflow.co · outdoorgearlab.com · bobvila.com · powerstationadvisor.com · robbsutton.com
BLUETTI AC70
The AC70's coverage is broader and more settled, and it lands on the same three things every time: it charges fast, it's genuinely portable, and it's a lot of station for the moneyB0B2B4. Turbo AC charging refills it in under an hour, and pass-through works properly, so it can take AC, solar or car input while it's still running your devicesB2. The fan is quiet at low draw and climbs to old-gaming-PC volume when you lean on it, which nobody describes as intrusiveB1. It's described as compact enough to carry around and still big enough to run devices for a day or moreB4, and one review came through testing with nothing to report at all, along with confirmation of the warranty structure: three years standard, five if you buy from BLUETTI's own site or registerB3.
“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
- Established home-backup platform with wheeled portability and massive expandability; the consistent knock is fan noise under heavy load. [DELTA Pro · 3 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
“Long regarded as a gold standard for home backup — designed for high-draw appliances and full-scale battery expansion, running home essentials like a fridge, lighting, and a space heater through outages.”
backuppowerhub.com / us.ecoflow.com — EcoFlow DELTA Pro review · 2025-2026 · [positive]
- A2
“Heavy but wheeled — integrated wheels and a telescoping handle help move its considerable weight, though they work best on flat, smooth surfaces; a cart is needed for uneven ground.”
outdoorgearlab.com / bobvila.com — DELTA Pro-line review · 2025-2026 · [mixed]
- A3
“Reliable through extended outage use — served as primary backup across multiple overnight outages over months, powering essentials simultaneously; LFP battery rated for thousands of cycles and 10+ years of daily use.”
powerstationadvisor.com / robbsutton.com — DELTA Pro-line review · 2025-2026 · [positive]
- A4
“Not silent under heavy load — under 2000W-plus draws the fans emit a noticeable high-pitched whine that's distracting in a quiet room, though it runs quietly enough at lighter loads.”
outdoorgearlab.com — DELTA Pro-line noise testing · 2025-2026 · [negative]
- 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]
- B4
“A compact ~22-lb unit — small enough to carry around but big enough to power devices for a day or more; widely regarded as a strong budget power station.”
thedigitalstory.com / kenrockwell.com — AC70 review · 2024-2026 · [positive]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA Pro if you…
- →You lose power a few times a winter and want the fridge, the lights and the modem not to notice. A 1,645Wh evening of essentials leaves 1,415Wh still in the pack the next morning, which is the following evening too.
- →You camp out of a vehicle rather than on your back. A 2,100Wh weekend finishes with 960Wh to spare, and the 30A RV outlet means a trailer plugs straight in where the AC70 offers none.
- →You need more than two things plugged in at once during an outage. Five AC sockets against the AC70's two is the difference between running the fridge, a lamp, a laptop brick and a phone charger together, and rotating them.
- →You already suspect the load is going to grow. This is the one of the two that accepts expansion batteries, so 3,600Wh is a starting point rather than a ceiling.
Buy the AC70 if you…
- →Your list is a CPAP, a phone and a laptop. 320Wh a night against 653Wh usable is two nights of breathing machine with 13Wh to spare, and it fits on the nightstand instead of the floor.
- →You will actually carry it. 22.5 lbs is one hand, a canoe portage, a walkup, a tent site a hundred yards from the car. 99 lbs is a decision you make once and then live with.
- →You want it topped up between errands rather than overnight. Turbo AC charging refills it in under an hourB2, which on a 768Wh pack means treating it more like a phone than an appliance.
- →Your loads sit under about 650Wh a day and you'd rather put the difference toward panels. Its 500W solar ceiling refills the whole pack in about an hour and a half of strong sun (768Wh over 500W).
If neither fits
If your day looks like van life, which we model at 4,685Wh of fridge, fans, pump and laptops every single day, neither of these is your unit. The DELTA Pro gets 65% of the way there and the AC70 covers 14%, and no amount of careful shopping between them changes that. Close the tab and look at a substantially larger station, or at the DELTA Pro carrying expansion batteries, which is the only route to that number either of these offers. Same answer if you need 240V: neither record carries a 240V outlet, so a well pump or an electric dryer is out of scope for both, whatever the capacity says.
The Bottom Line
Buy the DELTA Pro if the reason you're shopping is an outage or a weekend away from a socket. It's the only one of these two that finishes either, and it does it without asking a higher rate for the energy: that penny is the entire value story, and once you've absorbed it the decision is purely about how many watt-hours you need. What you're paying for is roughly five and a half times more delivered energy over the rated life of the pack. What you're accepting is 99 lbs that stays where you put it.
And buy the AC70 without apology if your list fits inside 653 usable watt-hours. It isn't the budget compromise here, it's the correct object for a phone, a laptop and a breathing machine, and it weighs 76.5 lbs less than the alternative. The mistake this page exists to prevent is the other one: buying 768Wh because it was the comfortable number on the screen, then finding out during the first real outage that a blackout evening asks for 1,645Wh. Add up a day of your loads. Everything on this page is downstream of that one number, and once you have it this stops being a close call.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro overkill if I only want to back up my fridge?
For one fridge across a short outage, yes, but overkill is the wrong frame. The eight-hour blackout we model is 1,645Wh of fridge, lights and small electronics, and the DELTA Pro finishes it with 1,415Wh left, which is the next evening too. The AC70 is 992Wh short of the first one. If your outages run hours rather than days and the fridge is genuinely all you care about, look at something sized between these two rather than either of them.
Can the BLUETTI AC70 run a full weekend of camping?
Not a full one. A camping weekend as we model it is 2,100Wh and the AC70 has 653Wh of usable energy, so it covers roughly a third of the trip and comes up 1,447Wh short. It'll handle one night easily: phone charging, lights, a CPAP, a laptop. What it won't do is keep a fridge cold across two days, and its 500W solar ceiling only closes that gap if you brought panels and got good sun.
Which one is actually cheaper to own?
They're a penny apart. Spread each price across the energy its pack is rated to deliver and the DELTA Pro comes out at $0.15 per kilowatt-hour against the AC70's $0.16, which makes the big unit nominally the cheaper of the two to own by a margin nobody will ever notice. Both cycle ratings are minimums, so both figures are conservative. Buy on the capacity you need, because the rate is the same either way.
Can I add a battery to the AC70 later?
No, not in a way this site counts as expansion. Our record has the AC70 sealed at 768Wh. BLUETTI does sell an add-on battery the AC70 can draw from, but BLUETTI's own page describes that as working in power bank mode, and we don't classify power-bank-mode top-ups as expansion, because the unit's own capacity never changes. It's also moot at this size gap: even a generous reading of that accessory wouldn't approach the DELTA Pro's 3,600Wh base, so expandability isn't the axis this comparison turns on.
How bad is 99 lbs in practice?
It's a two-person job if stairs are involved and a shove on flat ground if they aren't, against the AC70's 22.5 lbs, which is about a loaded carry-on. Our spec sheet doesn't record whether this unit has wheels and a telescoping handle, and that one detail changes the whole calculation at this weight, so check the product photos before you commit. The accounts of an integrated handle describe the DELTA Pro line generally, and our own research flags that coverage as conflated with the later Pro 3.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Related comparisons
Where to buy
EcoFlow DELTA ProPick
$1,799.00
$1,799.00 · direct from EcoFlow
down from $1,899 · 5% below usual
Last checked 28 days ago. Prices move — check before you buy.
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BLUETTI AC70
$359.00
$359.00 · direct from BLUETTI
Last checked 28 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.