Head-to-head test
EcoFlow DELTA 2 vs EcoFlow DELTA Pro
Your worst night either fits inside the DELTA 2's 870 usable watt-hours or it doesn't, and if it doesn't, the extra 2,576Wh in the Pro works out cheaper per watt-hour than the capacity you already bought.
Full profiles: EcoFlow DELTA 2 → · EcoFlow DELTA Pro →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$499.00 · direct from EcoFlow
Last checked 52 days ago. Prices move — check before you buy.
$1,899.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
Spec deltas
$499 buys 1,024Wh. $1,599 buys 3,600Wh. That's 3.2 times the money for 3.5 times the battery, so the bigger box is also the cheaper energy, and the question stops being whether the Pro is good value and becomes whether you'll ever use it.
Derate for the inverter and the DELTA 2 hands over 870Wh of the 1,024 on the label. Of the six load profiles we run it clears two: the 320Wh CPAP night and the 670Wh tailgate. It misses the 910Wh remote workday by 40Wh, the 1,645Wh blackout by 775Wh, and the 2,100Wh camping weekend by 1,230Wh. The first of those is a rounding error you can plan around. The other two are not.
The Pro covers five of the six, and it does that without becoming slower to refill. 3,600Wh over a 1,600W solar ceiling is roughly two and a quarter hours of full-rate sun; the DELTA 2's 1,024Wh over 500W is roughly two. What you pay for it is 99 lbs against 27, and $1,100 you don't recover if your evenings never cross the line.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Which quietly kills the instinct to start small and add another one later. Three DELTA 2s run $1,497 for 3,072Wh and still land 528Wh under a single Pro, spread across three boxes with three separate outlet banks that can't pool into one load. The Pro is $102 more than that stack, in one box, on one set of outlets.
DELTA 2: $499 for 1,024WhDELTA Pro: $1,599 for 3,600WhThe gap between them is $1,100 for 2,576Wh
Why it mattersIf you already suspect 1,024Wh won't be enough, buying up front is the cheaper order of operations, not the extravagant one.
solar input
That changes what the blackout looks like. The DELTA 2 isn't 775Wh short once, it's 775Wh short each time the outage runs a full day, and it has to spend the daylight earning it back. Its fans come on above 120W and a fast recharge reads as gaming-laptop loud to ownersA1A2, so the refill is something you sit next to. A bigger tank that fills just as quickly is the rare upgrade with no tax attached.
DELTA 2: 500W solar input against 1,024Wh of batteryDELTA Pro: 1,600W solar input against 3,600Wh of batteryThe 8-hour blackout needs 1,645Wh; the DELTA 2 has 870Wh usable
Why it mattersIf you're buying for outages rather than trips, compare time-to-refill, not capacity.
continuous output
But that gap doesn't decide one of these six profiles. Every DELTA 2 failure here is an energy failure, not a power failure: the inverter handles the peak and then the battery runs out underneath it. The ceiling argument only bites if you can name the appliance, and the list is specific. Well pump, AC compressor, 15-amp tool.
DELTA 2: 1,800W continuous, 2,700W surgeDELTA Pro: 3,600W continuous, 7,200W surgeThe DELTA 2's 1,800W continuous rating covers the peak draw in all six scenario profiles
Why it mattersDon't pay the upgrade for the inverter unless you have that appliance. Pay it for the watt-hours.
weight
So the cheaper and lighter unit takes the one scenario where the buyer sleeps closest to the machine, and the Pro's contribution is 2,740Wh you paid for and left in the battery. For someone running medical gear and phones, the Pro isn't the better unit. It's a 99 lb nightstand.
CPAP overnight needs 320Wh; the DELTA 2 finishes with 550Wh spareThe DELTA Pro finishes the same night with 2,740Wh untouchedDELTA 2: 27 lbs. DELTA Pro: 99 lbs
Why it mattersIf your worst night is a CPAP and some devices, buy the DELTA 2 and keep the $1,100.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Two of six load profiles fit inside the DELTA 2's 870Wh usable; the Pro covers five, and one is past both of them.
The DELTA 2's misses are only close once. It comes up 40Wh short on the 910Wh remote workday, which is a shortfall you fix by topping the laptop up before you unplug. Then it's 775Wh short of the blackout and 1,230Wh short of the camping weekend, and no amount of dimming screens recovers that.
Where it does clear, look at how much room is left. 550Wh after the CPAP night, which is comfortable. 200Wh after the tailgate, which is not. The Pro answers all of it the same way, with 3,060Wh usable, and it only gets interesting at Van Life Daily, where a 4,685Wh day leaves even the big unit 1,625Wh short.
Lifetime Value
Selected because: $499 against $1,599, and whether the per-kilowatt-hour math makes that gap a premium or a discount.
cost / lifetime kWh
Thirteen cents a lifetime kilowatt-hour against sixteen, because 3,500 cycles across 3,600Wh add up to 12,600 kWh of throughput for the Pro versus 3,072 kWh for the DELTA 2. On paper the expensive unit is the cheaper one to own.
Here's the part that argues against my own pick: almost nobody collects that. At weekend use the DELTA 2's cycles take 28.8 years to spend and the Pro's take 33.7, and both of those outlast any interest you have in the box. The number that actually lands is what you're paying for the guaranteed window. $100 a year for the DELTA 2, $320 for the Pro, five years of coverage on each.
Portability & Form Factor
Selected because: 27 lbs against 99 lbs is the one gap no amount of capacity closes.
weight
27 lbs is a one-hand lift and a back-seat footwell. 99 lbs is two people, or one person with a plan. That settles most of the camping question no matter what the watt-hours say, because the unit that can finish the weekend is also the one you have to get to the site.
The Pro's saving grace is that it's built to be dragged rather than carried, and reviewers describe the wheels and telescoping handle as fine on flat ground and a problem the moment the ground isn'tB2. Driveway to garage, no trouble. Parking lot to a pitch across wet grass, bring a friend.
What the Specs Don't Tell You
Selected because: Fan noise, surge ceilings, and a warranty comparison that turns out to be the price gap in disguise.
rated cycles
Ignore the warranty card. Both units carry five years on identical terms, and the coverage-per-dollar figure beside it is the price gap relabelled: divide the same five years by two different prices and you've measured which unit is cheaper, which the price tags already told you.
The surge flag is worth more. 2,700W against 7,200W is a real ceiling difference, and the Pro's 3,600W continuous rating sits above the DELTA 2's surge ceiling entirely. Just be precise about what that means. A load between 1,800W and 2,700W is one the DELTA 2 can start and can't hold, which is a different failure from refusing to start it, and neither failure shows up in any of the six profiles here.
Growth Path
Selected because: Both take EcoFlow expansion batteries, so the real divergence is a 500W solar ceiling against 1,600W.
solar input
Both units take EcoFlow expansion batteries, which makes the expansion column a wash and hands the argument to the input column. 500W against 1,600W is the difference between adding capacity you can keep fed and adding capacity that takes longer and longer to fill.
So if you're building toward off-grid rather than buying a backup box, the ceiling that matters is the one on the way in. A bank you can only refill at 500W spends its summer half empty.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Costs $1,400 less
- +Lighter by 72 lb
Trade-offs
- –Weaker inverter (-1,800W) limits appliance compatibility.
EcoFlow DELTA Pro
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$1,400) than the DELTA 2.
- –Significantly heavier (+72 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.
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
Only the Pro finishes the weekend. 2,100Wh across two nights leaves the DELTA 2 1,230Wh short, which is not a gap you plan around, and the Pro clears it with 960Wh still in reserve. The honest cost of that win is 99 lbs against 27, so the Pro is the right camping unit only when the campsite is roughly where the car stops.
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
1,645Wh is where the DELTA 2 stops being a backup and becomes a bridge. It's 775Wh short of the full eight hours; the Pro covers it and still holds 1,415Wh. The other half of the answer is the refill. A 1,600W solar ceiling puts the Pro's 3,600Wh back inside roughly the same daylight the DELTA 2 needs to replace its 1,024Wh at 500W, so the bigger unit doesn't cost you a slower recovery.
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 2
The DELTA 2 takes this one, and capacity was never the question: 320Wh across the night leaves it 550Wh in reserve. What's left to decide is which box you want on the nightstand, and that's the 27 lb one. The Pro would finish the same night with 2,740Wh untouched, which is a lot of battery to sleep beside. Neither unit is working hard enough here for its published noise rating to mean much.
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 Pro wins this on a margin that still reads like a loss for the other guy. The day wants 910Wh and the DELTA 2 has 870Wh usable, so it's 40Wh short, roughly a laptop top-up done at the wrong moment. Charge the machine before you unplug and the DELTA 2 sees the day out. The Pro covers it outright with 2,150Wh left, which is more headroom than a desk knows what to do with.
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
Both finish game day and the Pro takes it on reserve, 2,390Wh left against the DELTA 2's 200Wh. Worth knowing what that reserve costs in the parking lot, though, since the DELTA 2 is 27 lbs and the Pro is 99. At the 670Wh profile the small one is enough and it's the one you can carry one-handed. Run longer than the game or add a second cooler and that 200Wh margin goes quickly.
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 covers this scenario's 4,685Wh: the DELTA 2 comes up 3,815Wh short (about 19% covered), the DELTA Pro 1,625Wh (65%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
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 4.2h.
$1,899 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 0–204hComfort & 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
August 9, 2026
Verdict: the DELTA Pro, on Power Score margin
Take the DELTA Pro if anything you do regularly crosses 870Wh in one sitting, which covers most of the reasons people shop this size. The 8-hour blackout profile wants 1,645Wh and leaves the DELTA 2 775Wh short; a camping weekend at 2,100Wh leaves it 1,230Wh short. The Pro covers both, and the $1,100 gap between $499 and $1,599 prices its extra 2,576Wh at about 43 cents a watt-hour, under the roughly 49 cents ($499 divided by 1,024Wh) the DELTA 2 charges for its own. The catch is 99 lbs and cash you don't get back: if your real load is a CPAP and a couple of phones, the DELTA 2 finishes that night with 550Wh spare, weighs 27 lbs, and saves you the difference. Buy on the load, not the badge.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 9, 2026. The links below open EcoFlow's current price.
$1,899.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
or check the DELTA 2 price$499.00 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): CPAP, Tailgating, 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 2 rates 4.1/5 (48th percentile of 26 Everyday-class units), and DELTA Pro rates 3.9/5 (33rd percentile of 16 Home Backup-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 Against 27 lbs
The Pro weighs 99 lbs and the DELTA 2 weighs 27. That's the difference between an object you move and an object you site. Work out where it lives before you work out what it holds: garage, hall closet, back of the truck, and how many times a year it has to leave that spot. If the answer is often, and by you, alone, then the watt-hours stop being the argument.
Both Ratings Are Worst-Case
50dB for the DELTA 2, 60dB for the Pro. Both are figures taken under load, which means they describe the hardest the unit ever works, not the night you'll actually have. A CPAP-scale draw doesn't take either unit near its rating; a fast recharge or a heavy appliance takes both there. If it sleeps in the bedroom, the thing to plan around isn't the decibel number, it's whether you'll be recharging while you're asleep.
Compare the Ceilings Directly
2,700W of surge on the DELTA 2 against 7,200W on the Pro, on continuous ratings of 1,800W and 3,600W. The Pro's continuous figure is higher than the DELTA 2's surge ceiling outright, so a load the DELTA 2 can only briefly start is one the Pro simply runs. Be precise about that distinction, because it's the one people get wrong: between 1,800W and 2,700W the DELTA 2 can get an appliance moving and then cannot keep it moving, which is a different problem from failing to start it at all. On these six scenario profiles it never comes up. The DELTA 2's 1,800W continuous rating covers every peak in them, and where it loses, it loses on watt-hours.
Same Five Years On Both
Both units carry a five-year warranty on identical terms, so there is no coverage difference to weigh. The per-dollar version of the comparison is the price gap wearing a different hat: dividing the same five years by two different prices measures which unit is cheaper, not which is better protected. Decide on capacity, weight and price, and treat the warranty as a constant.
Full record above — the Test Desk pick is the DELTA Pro.
Check DELTA Pro price →or check the DELTA 2 priceOwnership Analysis
What happens after you buy — true cost of ownership, brand trust, and growth potential.
Lifetime value
Service lifeyears at one full cycle per day
Lifetime energy delivered
Cost per delivered kWh
│ warranty ends · Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
Analyst note
The DELTA 2 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.
Growth path
DELTA 2
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the DELTA Pro's higher solar ceiling (1,600W vs 500W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 2
The fan is the complaint, and it's consistent. Field reports have the fans triggering at anything above 120W and running continuously at maximum load, and a 1,200W recharge described as sounding like a gaming laptop, though the app will let you slow the charge to quiet itA1A2. EcoFlow has signalled it intends to address fan behaviour in firmwareA4, which is an intention rather than a fix, so buy on what the unit does today.
Past the noise the record is good. Reliability held up through repeated outages, camping trips and daily home-office use, with the LiFePO4 chemistry and the expansion option both singled out as the reasons it aged wellA3.
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
Sources
portablepowerlab.com
EcoFlow DELTA Pro
Read the DELTA Pro's coverage with one eye on which model is actually being reviewed. Most of the available field writing describes line-level traits rather than measurements taken on this 3,600Wh unit, so what carries across is character, not numbersB2B4.
That character is consistent. Reviewers treat it as the reference point for home backup, run as primary power across months of overnight outages with the fridge and lights on itB1B3. Two knocks come through clearly. It's wheeled rather than portable, and the wheels want flat, smooth groundB2. And under heavy draw the fans put out a high-pitched whine that's distracting in a quiet room, while lighter loads stay civilB4.
“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
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Fan noise under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 · 3 entries]
- Established home-backup platform with wheeled portability and massive expandability; the consistent knock is fan noise under heavy load. [DELTA Pro · 3 entries]
- A1
“Fans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld — EcoFlow Delta 2 review · 2026 · [negative]
- A2
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
PCWorld — EcoFlow Delta 2 power station review · 2026 · [mixed]
- A3
“After 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use · 2026 · [positive]
- A4
“EcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”
portablepowerlab.com — EcoFlow Delta 2 Review · 2026 (dated claim — may be partially addressed) · [mixed]
- B1
“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]
- B2
“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]
- B3
“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]
- B4
“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]
Research compiled August 9, 2026.
What Owners Actually Report
Drawn from 302 comments on independent review channels — not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.
EcoFlow DELTA 2
224 claims from 155 comments · 178 from owners · 60 with figures
- Runtime
- 32 · 13% negative
- Price & value
- 38 · 4% negative
- Charging
- 17 · 23% negative
- Durability
- 22 · 67% negative
- Warranty & support
- 22 · 59% negative
What owners complain about
Ignores solar unless he unplugs it from the wall, so he switched to the AC180.
Solar inputowner63 agreedsource →
His Delta 2 went bad three months after purchase and EcoFlow agreed it was defective.
Durabilityownerafter 3 months236 agreedsource →
Past 30 days the five-year warranty only gets a refurbished unit covered for 30 days.
Warranty & supportowner236 agreedsource →
What owners praise
DELTA 2 plus extra battery and 600W solar cost ~$1200 and paid for itself in under 2 years in California.
Price & valuemeasuredowner736 agreedsource →
Batteries still hold 98%+ capacity, ahead of the 80%-at-10-years warranty curve.
Durabilitymeasuredowner736 agreedsource →
Gets 180-190W into it from a 100Ah LiFePO4 via XT60i cable, no converter needed.
Chargingmeasuredowner106 agreedsource →
EcoFlow DELTA Pro
211 claims from 147 comments · 155 from owners · 39 with figures
- Price & value
- 37 · 26% negative
- Durability
- 22 · 73% negative
- Solar input
- 23 · 35% negative
- Runtime
- 18 · 23% negative
- Other
- 18 · 48% negative
What owners complain about
Bought October 2023, died June 2024.
Durabilitymeasuredownerafter 8 months25 agreedsource →
The 100 lb weight of the DELTA Pro is no joke.
Size & weightmeasuredowner14 agreedsource →
Even the 767's loudest fan state is far quieter than the DELTA Pro.
Noiseowner41 agreedsource →
What owners praise
Charges two DELTA Pros from two ~2,500W strings running at about 125V.
Solar inputmeasuredowner13 agreedsource →
Electric bill fell from $250 a month to between $26 and $44.
Price & valuemeasuredowner14 agreedsource →
Delta Pro with battery and 800W of solar keeps him fully off grid and happy.
Runtimeownerafter 8 months62 agreedsource →
Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results — for measurements we ran ourselves, see the methodology.
Who Should Buy Which
Buy the DELTA 2 if you…
- →Your worst night is a CPAP, a phone or two and a lamp. 320Wh of that leaves the DELTA 2 with 550Wh in reserve, and 27 lbs sits on a nightstand without becoming a conversation.
- →You carry it yourself, often. Trunk to campsite, apartment stairs, third-floor walk-up during an outage. The Pro is a two-person object.
- →You want the desk day and you'll meet it halfway. 40Wh is the entire gap on the 910Wh remote workday. Charge the laptop before you unplug and the DELTA 2 finishes.
- →Game day, at the 670Wh end of it. The DELTA 2 lands 200Wh clear and you can carry it across the lot with a chair in the other hand.
Buy the DELTA Pro if you…
- →You're buying for outages. The eight-hour profile wants 1,645Wh and the DELTA 2 is 775Wh short of it. The Pro finishes with 1,415Wh still in the tank and pulls 1,600W of solar back into it when the sun returns.
- →You drive to the campsite and unload where you park. 2,100Wh over a weekend is past the DELTA 2 by 1,230Wh, and if the Pro's only journey is tailgate to a flat patch of ground, 99 lbs stops being the objection.
- →You already know you're going to grow the system. Two DELTA 2s get you 2,048Wh for $998 across two sets of outlets; the Pro starts at 3,600Wh in one pool and feeds a growing bank at 1,600W.
If neither fits
If your day genuinely looks like the Van Life Daily profile at 4,685Wh, close this tab. The DELTA 2 covers about 19% of it and the Pro about 65%, which means even the big one comes up 1,625Wh short every single day, and you'd be recharging from zero every afternoon forever. That's a house-bank problem, not a portable-station problem: look at a larger station built around a serious expansion stack, or a proper fixed 12V bank with an inverter sized to the load.
The Bottom Line
Take the DELTA Pro if you can name a night that needs more than 870Wh, and take it knowing exactly what the money bought: 2,576Wh of extra capacity at about 43 cents a watt-hour, cheaper per unit than the energy inside the DELTA 2, in a box that refills from the sun in the same part of a day despite carrying three and a half times the battery.
And take the DELTA 2 without apology if your nights are small. It clears the CPAP with 550Wh in hand, weighs 27 lbs, and leaves $1,100 in your pocket. The Pro's advantage is real and it is made entirely of watt-hours you have to actually use. Decide by looking at your worst night, not at the spec table.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro worth $1,100 more than the DELTA 2?
If anything you do regularly needs more than 870Wh in one sitting, yes. That $1,100 buys 2,576Wh, about 43 cents a watt-hour, against the roughly 49 cents the DELTA 2 charges for its own capacity, so the bigger unit isn't carrying a premium. If your loads stay under 870Wh you're buying watt-hours that never leave the battery, and then the Pro is the wrong purchase at any price per watt-hour.
Will the DELTA 2 get me through an 8-hour blackout?
Not the full eight the way we model it. That profile draws 1,645Wh and the DELTA 2 has 870Wh usable after the inverter derate, so it's 775Wh short. It covers the first stretch and then you're recharging in the middle of an outage. The Pro finishes the same eight hours with 1,415Wh left over.
Is the DELTA Pro too heavy to camp with?
99 lbs is fine when the campsite is where you park and awkward everywhere else. It rolls on flat, smooth ground and wants help off it. The DELTA 2 at 27 lbs goes wherever you can walk, and that's the whole trade: the unit that can actually finish a 2,100Wh weekend is the one you may not want to move.
Which one is quieter?
On the rating, the DELTA 2 at 50dB against the Pro's 60dB. In practice both are load-dependent. The DELTA 2's fans come on above 120W and get loud on a fast recharge, and the Pro stays civil at light loads and whines under heavy draw. At CPAP-scale draw neither is working hard enough for its rating to describe it, so the question is really whether you'll be recharging while you sleep.
Should I buy two DELTA 2s instead of one DELTA Pro?
Two DELTA 2s cost $998 for 2,048Wh, which is $601 cheaper than the Pro and 1,552Wh less energy. Three cost $1,497 for 3,072Wh and still come in 528Wh under a single Pro while saving only $102. Separate units also mean separate outlet banks, so one big load can't draw on both. Buy two if you want a unit in the van and a unit at home. Buy the Pro if you want one pool of energy.
Where to buy
EcoFlow DELTA 2
$499.00
$499.00 · direct from EcoFlow
Last checked 52 days ago. Prices move — check before you buy.
EcoFlow DELTA ProPick
$1,899.00
$1,899.00 · direct from EcoFlow
Last checked 3 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.