Head-to-head test
EcoFlow DELTA Pro Ultra + 2 Batteries vs BLUETTI AC70P
One of these is an appliance you site on a garage floor and wire into the house; the other is a 22.5-lb box you throw in the trunk, and that single fact settles this before the spec sheet gets a vote.
Full profiles: EcoFlow DELTA Pro Ultra + 2 Batteries → · BLUETTI AC70P →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
The DELTA Pro Ultra bundle holds 18,432Wh and weighs 405.4 lbs. The AC70P holds 864Wh and weighs 22.5 lbs. That is twenty-one times the battery for eighteen times the mass, and it is the whole page: these are not competing products, they are two different categories that happen to share a search result and sit $7,500 apart.
Look at what the two port panels are for. The bundle gives you three AC outlets, two 240V outlets and a 30A RV socket, and no 12V car socket at all. The AC70P gives you two AC outlets, a 12V car socket, and no 240V. One of those port lists belongs next to a breaker panel. The other belongs next to a dashboard.
So the verdict below goes to the AC70P, and it is a claim about who lands here rather than about which machine is better. If you already have an electrician's quote and a spot on the garage floor you will never need for anything else, you are not choosing between these two at all, and this page is a detour on the way to comparing installed systems. If you do not, the 22.5-lb box is the purchase, and the rest of this is about sizing it without kidding yourself.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
Cheap per kilowatt-hour is only cheap if you spend the kilowatt-hours. A CPAP night is 320Wh, which is 2% of the bundle's charge. Buy 18,432Wh for that and you have paid for a battery that sits nearly full for a decade while the per-kWh figure describes energy you never drew. The AC70P's worse ratio is attached to a capacity somebody might actually cycle.
The bundle works out to $0.12 per lifetime kWh over 3,500 rated cycles; the AC70P to $0.19 over 3,000.The bundle is also the cheaper of the two per watt-hour of nameplate capacity.Total energy over rated life: 64,512 kWh for the bundle against 2,592 kWh for the AC70P.
Why it mattersIf you are using cost per watt-hour or cost per lifetime kWh to break the tie between these two, stop. Pick the size class first, then compare cost inside it.
weight
That turns this into a category question rather than a spec question. If the power has to come to you, at the campsite or the tailgate or the far end of the driveway, the bundle is disqualified before capacity is mentioned, and 18,432Wh of disqualified capacity is worth nothing. If the power has to stay put and run a house, the AC70P is not a smaller version of that: 864Wh, of which 734Wh is usable after the standard derate, against the 1,645Wh an eight-hour house-load blackout asks for.
The bundle weighs 405.4 lbs and our record flags it as stationary hardware.Its outlets are three AC, two 240V and a 30A RV socket, with zero 12V car sockets.One owner's install took an electrician about nine hours including cutting drywall to sink the panel into the wallA17, and finding an installer with experience of this gear took lookingA16.The AC70P is 22.5 lbs, with a 12V car socket and no 240V.
Why it mattersSettle where the power has to live before you read another number, because that answer eliminates one of these two outright.
continuous output
A compressor draws a number of watts at switch-on, not a multiple of somebody else's continuous rating. The AC70P's doubled cushion means it rarely strains inside its own class, which is a real virtue and not a starting spec. Starting ability here is 2,000W against 10,800W, and nothing about the ratio changes that.
AC70P: 1,000W continuous, 2,000W published surge, so twice its own rating in reserve.Bundle: 7,200W continuous, 10,800W published surge, so half again its own rating.A reviewer on this platform powered a central air conditioner, a refrigerator and a well pump at once without a flickerA9.
Why it mattersIf one specific motor is the reason you are shopping, find its startup watts and check them against 2,000W. The ratio is not the test.
That quietly rules out the most common emergency-prep plan there is, which is charge it, put it in the garage, and forget it until the storm. A system whose idle draw is measured in days is a system you leave connected. Fine for an appliance wired to a panel. Wrong for a box you wanted to shelve.
A tester calculated that with no grid or solar input the system would drain its own 6kWh battery in roughly 60 hours, and said off-grid users must budget for itA7.One owner watched a '90%' charge fall to '8%' across a few days of overnight useA6.The bundle accepts 5,600W of solar input: 18,432Wh at 5,600W is about three and a half hours of perfect sun.
Why it mattersIf the plan is 'charged and waiting in the garage', budget on leaving the bundle connected rather than assuming it holds a charge untouched for months.
The specific dimensions that decide these two units — everything else is a tie.
Portability & Form Factor
Selected because: 405.4 lbs against 22.5 lbs is not a portability rating, it is a decision about where the power has to be.
weight
405.4 lbs is a floor you choose once. No single piece is that heavy, since the total is spread across an inverter and a battery stack, but the heaviest piece in that stack is a 115-lb two-person liftA8. The AC70P is 22.5 lbs: one hand, out to the car, up a flight of stairs, onto a picnic table.
The real tell is the solar row, not the handle. The bundle takes 5,600W of input, which refills 18,432Wh in about three and a half hours of perfect sun; the AC70P takes 500W and refills 864Wh in under two. Neither is slow. But 5,600W of panels is a roof, and 500W is two folding panels leaned against a van. You are not choosing a lighter version of the same product. You are choosing whether the power lives in the house or comes along.
Your Life, Your Pick
Selected because: The six load profiles split cleanly: the bundle takes every energy question, the AC70P takes the one where the box has to travel.
Weekend camping is the row that explains everything else: neither unit gives you a powered weekend. The AC70P has 734Wh usable against a 2,100Wh trip and comes up 1,366Wh short, about a third of the way there. The bundle would cover it on 13% of its charge, if 405.4 lbs could be talked into a campsite. One of them cannot make the trip and the other cannot make it to Sunday.
Remote Workday is the row that tells you what 864Wh actually is. The AC70P ends it 176Wh short, roughly four fifths of a working day: a long shift, not a day. And Tailgate Party goes to the AC70P with 64Wh left over, which is a win rather than a cushion. If your load list has a well pump on it, stop reading the small column. If it has a laptop, a phone and a fan, stop reading the big one.
Lifetime Value
Selected because: The expensive unit is also the cheaper energy, at $0.12 per lifetime kWh against $0.19, and that figure is a trap unless you spend the kilowatt-hours.
cost / lifetime kWh
Twelve cents a kilowatt-hour against nineteen. The 405-lb bundle is the cheaper energy, and it is the cheaper capacity per watt-hour too, which is exactly why neither number should decide this. Over rated life it delivers 64,512 kWh against the AC70P's 2,592, and the money amortizes beautifully on paper.
It amortizes on the assumption that you cycle 18,432Wh with some regularity. Run a CPAP and a phone off it and you have a battery living at 98% charge for a decade while the per-kWh figure quietly describes energy you never used. Size the unit to the loads, then compare cost inside the size class. Comparing it across classes is how people end up with a garage full of storage and the same evening's worth of power they had before.
What the Specs Don't Tell You
Selected because: The weight, the warranty terms and the surge ceiling are where this pair's real trade-offs sit, and none of them is on the headline spec row.
rated cycles
The warranty row is the one to read twice: 10 years on the bundle against up to 5 on the AC70P with registration, and EcoFlow offers no parts and no service once the term is up. On a 405-lb appliance that lives on a concrete floor, the warranty is not a perk, it is the entire service plan, which makes the same ten-year number worth more here than it would be on something you could box up and ship back.
The surge row is where a ratio lies to you. The AC70P keeps twice its continuous rating in reserve, the bundle keeps half again, and that makes the small unit look like the one with headroom. Whatever you are starting has a startup wattage, and the only question is whether it sits under 2,000W or under 10,800W. The ratio tells you how relaxed an inverter is inside its own class. It tells you nothing about what will actually start.
Brand Trust
Selected because: A ten-year appliance you cannot lift depends on service, and EcoFlow offers no parts or service once the warranty ends.
Both brands have a service problem, and the stakes are not symmetric. EcoFlow's record splits two ways, prepaid-label replacements at one end and long waits with refurbished units at the other, and our own ledger has one owner bouncing off it three times over a missing manual, radio interference on 146.520MHz, and a state-of-charge graph the app does not haveA2A4A5. BLUETTI's support is the most inconsistent in the category, email-heavy with timezone delays, and third-party purchases muddy the claim path.
On a 22.5-lb unit the practical fallback is replacement, which takes most of the sting out of a patchy support desk. On hardware bolted to a transfer panel it is an argument you have to win, for ten years, with a company that stops selling parts when the term ends. If you are buying the bundle, put the support question in the install quote rather than the footnotes.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra + 2 Batteries
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$7,500) than the AC70P.
- –Significantly heavier (+382.9 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI AC70P
Strengths
- +Costs $7,500 less
- +Lighter by 382.9 lb
Trade-offs
- –Weaker inverter (-6,200W) limits appliance compatibility.
- –Sealed capacity — the DELTA Pro Ultra + 2 Batteries can add batteries to grow past 864Wh; 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
Neither unit
Nobody gets a powered weekend out of this pair. The AC70P has 734Wh usable against the 2,100Wh a weekend asks for, so it covers about a third of the trip and then it is luggage, and the DELTA Pro Ultra + 2 Batteries would cover the whole thing on 13% of its charge if 405.4 lbs could be talked into a campsite. Neither of those is a compromise you can live with for three days. The unit for this row is a mid-size carryable that one person can still lift, and it is not on this page.
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 + 2 Batteries
The AC70P doesn't finish — 734Wh usable against the 1,645Wh this needs leaves it 911Wh short, about 45% of the scenario covered. The DELTA Pro Ultra + 2 Batteries covers it with 14,022Wh 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 both of these cover the night at least twice over — capacity isn't the question here. The only published difference is fan noise, and it can't settle this: the DELTA Pro Ultra + 2 Batteries is rated 30dB and the AC70P 45dB, but they are two makers' figures, each measured its own way. Neither settles which box is quieter at a bedside. Buy whichever is cheaper or easier to carry.
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 + 2 Batteries
This is the row that tells you what 864Wh really is. The AC70P reaches 734Wh usable against the 910Wh a full working day wants and stops 176Wh short, roughly four fifths of the day: a long shift rather than a day. The DELTA Pro Ultra + 2 Batteries covers it on 6% of its charge, which is the least surprising sentence on this page. If the desk is somewhere without an outlet, the small unit needs either a shorter day or 500W of panel in the sun beside it.
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
AC70P
The AC70P takes this row because it is the only one of the two that can get to a tailgate, and then it earns it, finishing the 670Wh list with 64Wh left of its 734Wh usable. Read that margin honestly: it is a win, not a cushion. Add a second cooler or a bigger speaker and the load that just fit stops fitting. The DELTA Pro Ultra + 2 Batteries could run the entire parking lot. It is simply not invited.
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 + 2 Batteries
The AC70P doesn't finish — 734Wh usable against the 4,685Wh this needs leaves it 3,951Wh short, about 16% of the scenario covered. The DELTA Pro Ultra + 2 Batteries covers it with 10,982Wh to spare.
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 + 2 Batteries runs 76.4h vs 3.6h.
$7,999 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 0–1044.5hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–208.9hHigh-Draw Appliances
These reveal the real limitsscale 0–15.7h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
September 19, 2026
Verdict: the BLUETTI AC70P
Take the AC70P, and not because it is the better machine. The DELTA Pro Ultra bundle wins every energy question on this page by margins that stop being interesting: it covers an eight-hour blackout with 14,022Wh to spare, a van-life day with 10,982Wh, a CPAP night on 2% of its charge. It also weighs 405.4 lbs, offers three AC outlets, two 240V outlets and a 30A RV socket with not one 12V car socket among them, and in one owner's account arrived as a nine-hour job for an electrician who had to cut drywall to sink the transfer panelA17. Almost nobody who lands on this page is actually shopping for that. If you can name the circuits you need alive through a multi-day outage and you already have a quote for the panel, the bundle is the only unit here that can do it, and you should be comparing it against other installed systems rather than against something you can lift. Everyone else: the AC70P, sized honestly and with its 864Wh ceiling understood up front.
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.
$499.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
or check the DELTA Pro Ultra + 2 Batteries price$7,999.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Prices to beat:DELTA Pro Ultra + 2 Batteries $7,899AC70P $499
The lowest we have recorded for each. We have never seen the AC70P discounted, so any real cut on it would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, Home Backup, CPAP, Solar Generator, 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 Ultra + 2 Batteries rates 3.8/5 (29th percentile of 29 Whole-Home / Off-Grid-class units), and AC70P rates 4.4/5 (63rd 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.
405.4 lbs, Sited Once
The number to plan around is not the lift, it is the floor. 405.4 lbs arrives as an inverter and a battery stack, so no single piece is the whole problem, but nothing about the assembled system wants to be moved twice. Choose the spot for where the power needs to be in five years: near the panel, on a surface that does not bake in summer, and somewhere you will never need to park. The AC70P's 22.5 lbs is the opposite kind of decision, which is to say it is not really a decision.
AC70P: 45dB Published
45dB is about as loud as a running refrigerator. The DELTA Pro Ultra + 2 Batteries is rated 30dB — lower, but published by a different maker measuring its own way, so the two figures are not a like-for-like gap. For most people, fan noise around 45dB and up is where sleep starts to suffer.
Sealed at 864Wh, and the Fix Is Not This Page
Stated plainly about the unit we are recommending: 864Wh is the ceiling, there is no expansion battery, and outgrowing it means buying again rather than adding. Worth being honest about where that leads, though. The answer to outgrowing 864Wh is a bigger carryable, not 18,432Wh on a pallet, which clears that ceiling twenty-one times over and is the wrong kind of solution rather than a better one. Size for the loads you have, then leave room for the one load you know you will add.
AC70P: Power Lifting to 2,000W
The AC70P 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 AC70P's separate 2,000W surge peak, not this one. And it is not a reason to size down, because running a load that big from 864Wh 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 + 2 Batteries publishes no equivalent.
Surge Power: Ratio and Ceiling Disagree
The AC70P holds the higher surge-to-continuous ratio (2× vs 1.5×), but the DELTA Pro Ultra + 2 Batteries holds the higher absolute surge ceiling — 10,800W 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 Ultra + 2 Batteries is the stronger unit here — while the AC70P is the one running further below its own limit at steady state.
UPS Switchover: 0ms-rated vs ≤20ms
Both list a UPS mode, at different rated speeds. The DELTA Pro Ultra + 2 Batteries is rated 0ms — a no-break design on paper, which is the maker's classification rather than a stopwatch result. The AC70P is rated ≤20ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Ten Years Is the Service Plan
Terms first: 10 years on the DELTA Pro Ultra + 2 Batteries, and up to 5 on the AC70P with registration or a direct purchase, since reseller buys carry a shorter term. What makes the longer term matter more than the number suggests is what EcoFlow does after it expires, which is nothing, with no parts and no out-of-warranty service. For a unit you carry to the car, an expired warranty means buying another one. For an appliance wired into a wall it means the cover is the whole maintenance story, and year eleven is a question worth asking in year one.
Full record above — the Test Desk pick is the AC70P.
Check AC70P price →or check the DELTA Pro Ultra + 2 Batteries 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 AC70P is cheaper to buy, but the DELTA Pro Ultra + 2 Batteries is cheaper to own. At $0.12/kWh over its lifetime vs $0.19/kWh, the DELTA Pro Ultra + 2 Batteries'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 phone, email and chat, with a record that splits two ways: hassle-free prepaid-label replacements at one end, long waits and refurbished units against new claims at the other. Buying through Costco or Amazon layers a second safety net over it, which on hardware this size is worth more than it sounds.
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
Two things to weigh before a decade-long purchase. There are no parts and no service offered once the warranty ends, and EcoFlow tested subscription paywalls for advanced app features in early 2025 before backlash paused the plan. Neither matters much on a weekend unit. Both are worth a thought on hardware that gets wired to a panel.
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 category, heavily email-based with timezone delays, and the claim path gets murkier if you bought through a third party. Buying direct from BLUETTI improves both the odds and the warranty term. On a unit this size the practical fallback is a replacement rather than a repair, which takes most of the sting out.
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
The support question is not symmetric here, because the units are not. Both brands have a patchy service record; what differs is what a bad outcome costs you. A 22.5-lb box that cannot be fixed gets replaced. A 405.4-lb appliance wired into a transfer panel gets argued about, and EcoFlow stops offering parts or service when the ten-year term ends. If the bundle is your pick, treat support as part of the install decision rather than a footnote to it.
Growth path
DELTA Pro Ultra + 2 Batteries
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 18,432Wh.
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.
AC70P
FIXED CAPACITYFixed at 864Wh, 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 AC70P is sealed at 864Wh, which is fine if that covers you. The DELTA Pro Ultra + 2 Batteries starts at 18,432Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the AC70P 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 Ultra + 2 Batteries
Field coverage for this exact configuration is thin, and the thinness matters: most of what exists is one forum thread from a single owner plus short retailer reviews, several of which say outright that it is too early to speak to longevityA0. Read the rest of this as early reports rather than a track record.
Where the accounts agree is that it does the job it is sold forA9A10A13A14. One reviewer ran a central air conditioner, a refrigerator and a well pump simultaneously without a flickerA9. Another says the home panel hands over with no flicker and it runs most of the houseA14. A third owns two of these setups with two batteries each and calls the performance and scalability matchless, including how it manages its own temperatureA10. A fourth bought the second battery specifically for runtime and reports it doubled, which killed the anxietyA13.
The complaints cluster in two places, and neither is about power. Support is the first: one owner documented no real manual and being pointed back at the web guide twice, an answer of 'put it in a faraday cage' when the inverter interfered with 146.520MHz even at idle, and no state-of-charge graph in the appA2A3A4A5. Idle draw is the second: the same owner watched a '90%' charge fall to '8%' over a few days of overnight useA6, and a tester put the system's own consumption at roughly 60 hours to drain the 6kWh pack he was testing with no grid or solar inputA7.
Two smaller notes worth carrying into your siting decision. One owner found the battery nearest the inverter running about 10 degrees warmer than the one below it, consistently, after swapping them to rule out the pack, and worries about a garage that hits 98 degrees in summerA11A12. And one reviewer never heard a fan at all, calling it completely silentA15.
“This means that without any grid or solar input, the system would fully drain its own 6kWh battery in about 60 hours. For off-grid use, this parasitic drain must be carefully factored into your energy budget.”
BLUETTI AC70P
There is no owner testimony for the AC70P in our ledgerB0, and we would rather say that than dress up brand copy as field experience. What we have is the maker's own pages and buyer-guide write-ups: 864Wh on LiFePO4 rated for thousands of cyclesB1, a wall charge reaching 80% in roughly 0.8 hoursB2, and 1,000W continuous with 2,000W surge plus 500W of solar and 12V/24V car chargingB4. The charge time in particular is a manufacturer figure rather than a measured one, and our research flagged how much of the material on this unit is vendor-sourcedB0.
The one thing our research did settle is the expansion question, because it comes up constantly. The AC70P is sealed at 864Wh, and the cheaper AC70 accepts BLUETTI's B80 only in what BLUETTI itself calls Power Bank Mode, which this site does not count as expansionB0B3. Either way, neither one is the unit you buy planning to add capacity later.
“Holds 864Wh — about 96Wh more than the AC70 — on safe, stable LiFePO4 chemistry built for thousands of charge cycles.”
Sources
bluettipower.com · bestgeneratorsolar.com · madetoexplore.ca · truegear.com.au
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Owners repeatedly report EcoFlow customer support gives dismissive or unhelpful answers to specific technical questions (manual gaps, RFI interference, app charting). [DELTA Pro Ultra + 2 Batteries · 3 entries]
- The unit's idle/parasitic self-consumption is a recurring theme, both as a documented SoC anomaly and as an acknowledged spec-level drain figure from a tester. [DELTA Pro Ultra + 2 Batteries · 2 entries]
- Multiple owners note the extra battery packs are extremely heavy (100+ lbs each), requiring two people, and one owner separately observed uneven heat between stacked batteries raising summer overheating concerns. [DELTA Pro Ultra + 2 Batteries · 3 entries]
- Real owners with 2-battery setups consistently praise seamless/flicker-free UPS switchover and confirm the system genuinely runs whole-home loads (AC, well pump, most of house). [DELTA Pro Ultra + 2 Batteries · 3 entries]
- Adding a second battery is described by owners as meaningfully extending real-world runtime for whole-home backup, matching expectations. [DELTA Pro Ultra + 2 Batteries · 2 entries]
- AC70P's real advantages are more base capacity and faster wall charging; crucially it is sealed while the cheaper AC70 is the expandable model. [AC70P · 3 entries]
- A2
“No real manual. All they have is the web user guide which is superficial if I'm being generous. I asked support about it and they pointed me at the web guide I was complaining about. Twice.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A3
“Even when the inverter is not running, it interferes with common frequencies like 146.520MHz.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A4
“I contacted EcoFlow support and they told me I could put it in a 'faraday cage'.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A5
“No State of Charge graph in the app... I contacted support and twice they told me to go to the app screen with the charts, which only has input and output.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A6
“After a few days of using it overnight and letting it charge back up to '90%', it'd go from '90%' down to '8%'.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A7
“This means that without any grid or solar input, the system would fully drain its own 6kWh battery in about 60 hours. For off-grid use, this parasitic drain must be carefully factored into your energy budget.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [mixed]
- A8
“The main inverter is a manageable 71 lbs, but each Ultra Smart Extra Battery is a dense 115 lbs, requiring two people for safe movement.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [mixed]
- A9
“We powered a central air conditioner, refrigerator, and well pump simultaneously without a flicker.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [positive]
- A10
“I own two Delta Pro Ultra's with two batteries each... We have experienced matchless performance, scalability, flexibility. It cools/heats itself in temperature extremes-simply awesome!”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A11
“I noticed the battery closest to the inverter seems to run hotter than the one below. About 10 degrees warmer. I switched the batteries around to ensure that it wasn't the battery and got the same results.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [negative]
- A12
“My garage could get up to 98 degrees during the summer, that means my batteries can overheat.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [negative]
- A13
“I originally bought my Delta Pro Ultra with the single battery, worked great is able to power my entire home for about 4 to 5 hours during peak times... I bought a second battery... My run time has doubled eliminating the anxiety.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A14
“With the home panel, there is no flicker when the power changes. I bought a unit with 2 batteries and it runs my most of my house.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A15
“I was pleased to discover the DPU runs completely silent; if a fan kicked on at some point, I never heard it.”
Yahoo Tech — 'EcoFlow Delta Pro Ultra whole home battery backup review' · 2024-06 · [positive]
- A16
“In my neck of the woods (suburban Detroit), it was a bit challenging finding one who had experience with this kind of gear.”
Yahoo Tech — 'EcoFlow Delta Pro Ultra whole home battery backup review' · 2024-06 · [mixed]
- A17
“Sure enough, the job went smoothly; it took him around nine total hours to complete, which included cutting out portions of drywall in order to sink the panel into the wall.”
Yahoo Tech — 'EcoFlow Delta Pro Ultra whole home battery backup review' · 2024-06 · [mixed]
- B1
“Holds 864Wh — about 96Wh more than the AC70 — on safe, stable LiFePO4 chemistry built for thousands of charge cycles.”
bluettipower.com / bestgeneratorsolar.com — AC70P buyer's guide · 2026 · [positive]
- B2
“Recharges faster from the wall — supports a higher AC input and reaches 0 to 80% in roughly 0.8 hours, acting as an efficient fast charger when you're in a hurry.”
bluettipower.com / madetoexplore.ca — AC70P review · 2026 · [positive]
- B3
“The AC70P does NOT support battery expansion — it is sealed at 864Wh. By contrast, the cheaper AC70 CAN expand to roughly 1,574Wh by adding BLUETTI's B80 expansion battery.”
truegear.com.au / bluettipower.com — AC70 vs AC70P comparison · 2026 · [mixed]
- B4
“1,000W continuous / 2,000W surge, car charging (12V/24V), and solar up to 500W — the same as the AC70.”
bluettipower.com — AC70P specifications · 2026 · [positive]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra + 2 Batteries if you…
- →You can list the circuits by name: well pump, furnace blower, fridge, the central air. Owners and reviewers on this platform do carry that kind of load, one of them all at onceA9A14.
- →You have a permanent spot for 405.4 lbs and a wall you are willing to open. One owner's transfer panel took an electrician about nine hours including drywall workA17, and finding somebody locally who had worked with this gear took effortA16.
- →You will leave it connected to the grid or to a serious array. 5,600W of solar input refills 18,432Wh in about three and a half hours of perfect sun, and that feeding schedule is the assumption the design is built on.
- →You are really comparing whole-home systems and arrived here sideways. The bundle may well be the right answer; this page is the wrong bracket for settling it.
Buy the AC70P if you…
- →One CPAP, a phone, a lamp. 320Wh of CPAP against 734Wh usable leaves 414Wh in hand, and the box fits on the floor beside the bed.
- →The tailgate, the driveway, the trunk. It takes that row with 64Wh to spare because it is the one that can get there at 22.5 lbs, using a 12V car socket the bundle does not have.
- →A blackout where the goal is the router, the phones and the fridge in shifts rather than the house running as normal. It covers about 45% of a full eight-hour house load, so decide in advance what gets plugged in.
- →Your first power station, before you know your real numbers. Being wrong by 864Wh is a cheap mistake. Being wrong by 18,432Wh is a garage you cannot park in.
If neither fits
If you want a powered weekend in a tent, close the tab: the AC70P covers about a third of a 2,100Wh weekend and the bundle is not coming camping. That job belongs to a mid-size carryable, the class one person can still lift that actually finishes the trip, and it is not on this page. Same for the van-life reader, where 4,685Wh a day is more than five times the AC70P's entire battery and a fraction of a bundle that will not fit in a van: what you want is a mid-size expandable unit or a proper house battery wired to the alternator. And if you came to find out whether a carryable box can stand in for whole-home backup, the answer is no in both directions. 864Wh will not run a house, and 405.4 lbs will not leave the garage.
The Bottom Line
Twenty-one times the battery, eighteen times the weight, and the row it loses is the one where the box has to travel. The DELTA Pro Ultra bundle wins every energy question here and wins them by margins that stop meaning anything: 13% of its charge for a camping weekend it cannot attend, 2% for a CPAP night. Energy was never the constraint. The constraint is 405.4 lbs, a breaker panel's worth of outlets without a single 12V socket among them, and an electrician's dayA17.
So take the AC70P and size it honestly, knowing what you accept: 864Wh is the ceiling, it ends a full remote workday 176Wh short, and it takes the tailgate by 64Wh. If that is too small for you, the answer still is not the other column, it is a bigger carryable. And if you genuinely can name the circuits, get the quote and buy the bundle against other installed systems. Just do not buy it because the per-kilowatt-hour math flattered it on a page it happens to share with a box you can pick up.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the BLUETTI AC70P run a refrigerator during a power outage?
It should start one, and it will not carry your whole evening. 1,000W continuous with a 2,000W surge ceiling covers the startup spike of most household fridges, so check the label's startup watts against 2,000W rather than against any ratio. Energy is where it runs out: 734Wh usable against the 1,645Wh an eight-hour house-load blackout profile needs leaves it 911Wh short, about 45% of the night. Whether a fridge on its own fits depends on that fridge's daily draw, which is not in our data; the scenario figure is a whole-evening load list, not a fridge by itself.
How much does the DELTA Pro Ultra with 2 batteries weigh, and can one person move it?
405.4 lbs all in, and no, not assembled. No single piece is that heavy, since it is an inverter plus a battery stack, but the reviewer who handled one put the inverter at 71 lbs and each extra battery at a dense 115 lbs needing two people. The AC70P is 22.5 lbs, which is one hand and a staircase. Plan the bundle's location once and expect to live with it.
Is the DELTA Pro Ultra worth it compared with a cheap portable power station?
On energy economics yes, and that is the trap. It works out to $0.12 per lifetime kWh over 3,500 rated cycles against the AC70P's $0.19 over 3,000, and it is cheaper per watt-hour of capacity as well. Those figures assume you regularly cycle 18,432Wh. If your real load is a few hundred watt-hours a night, you are paying for storage that never gets used, and the small unit is the better buy by the only measure that applies to you.
Can you add a battery to the AC70P?
No. It is sealed at 864Wh, so what you buy is the ceiling. The cheaper AC70 does physically accept BLUETTI's B80, but BLUETTI describes that as working in Power Bank Mode and our records treat neither unit as expandable. If you think you will outgrow 864Wh, buy bigger now rather than planning to add later.
Will the AC70P work as a UPS for a desktop computer?
Probably, with a caveat about the shape of the spec. BLUETTI rates its switchover at no worse than 20ms, which is fine for routers, modems and most electronics, though the fussiest PC power supplies sit right around that line. The bundle is rated as a no-break design, which is the maker's own classification rather than a stopwatch result. Neither figure is a lab measurement, so if unsaved work is what you are protecting, test it with your own machine before you rely on it.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow DELTA Pro Ultra + 2 Batteries
$7,999.00
$7,999.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
BLUETTI AC70PPick
$499.00
$499.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.