Head-to-head test
EcoFlow DELTA 2 vs Jackery Explorer 1500 v2
The DELTA 2 is $220 cheaper, but its fans reportedly hit 48-55dB the moment load crosses 120W — a documented, EcoFlow-acknowledged problem — while the Jackery stays quiet at a rated 30dB and has the extra capacity to cover a CPAP night, a workday, and a tailgate with real margin.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 2
3,128Power Score · Appliance Class
$499.00 list · direct from EcoFlow
Jackery
Explorer 1500 v2
3,518Power Score · Appliance Class
$699.00 list · direct from Jackery
Spec deltas
The DELTA 2's most consistent complaint isn't a spec-sheet number — it's the fans. They reportedly trigger above 120W and climb to 48-55dB at higher loads, loud enough that EcoFlow was said to be planning a firmware fix for itA1A2A4. The Jackery Explorer 1500 v2 is rated 30dB flat, no asterisk.
Layer the capacity numbers on top and the case builds further: the Jackery's 1,536Wh beats the DELTA 2's 1,024Wh in every scenario that isn't oversized for both units, covering CPAP overnight, a remote workday, and a tailgate with real margin to spare.
The DELTA 2 answers with the lowest price of any unit in this whole comparison set — $479 — and it's expandable where the Jackery is sealed. If your loads are light and you don't mind a fan you can hear from across the room under real use, that's a fair trade. For most buyers, quiet and capacity both point the same direction here.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
A CPAP machine alone draws well under 120W, so it might dodge the fan threshold — but add a phone charger, a light, or anything else on the same unit and you cross into fan territory fast. The Jackery's flat 30dB doesn't have that trigger point to worry about.
DELTA 2 fans reportedly trigger above 120W and reach 48-55dB at maximum loadA1the DELTA 2 is spec-rated at 50dB, while the Jackery is rated at 30dBcharging at 1,200W has been described as sounding like a gaming laptopA2
Why it mattersAnyone running this near where they sleep should weight the noise difference as heavily as the price difference.
Capacity
That's before factoring in that the fans would likely be running the whole time under that load, given the 120W trigger point. The Jackery finishes the same day with headroom and without the noise.
a remote workday draws about 910Whthe DELTA 2 holds 1,024Wh and would use 105 percent of it to cover that loadthe Jackery holds 1,536Wh and covers the same load at 70 percent used
Why it mattersBuyers working off one of these units all day should take the Jackery on both capacity and comfort grounds.
rated cycles
At $0.16 per lifetime kWh against the Jackery's $0.11, the DELTA 2's low sticker price doesn't translate into the better long-run value — and a firmware fix for fan noise, even if shipped, doesn't change the underlying capacity gap.
the DELTA 2 costs $479 and the Jackery costs $699the DELTA 2 delivers 3,072 kWh of total lifetime energy (1,024Wh x 3,000 cycles); the Jackery delivers 6,144 kWh (1,536Wh x 4,000 cycles)EcoFlow reportedly planned a firmware fix for the fan noise but the complaint predates any confirmed resolutionA4
Why it mattersBuyers chasing the lowest price today should know it's not the lowest cost per kWh over time, and the noise issue may or may not be resolved on the unit they receive.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Capacity headroom decides CPAP, workday, and tailgate the same way it does across the DELTA line.
The Jackery wins CPAP overnight (25 percent used vs the DELTA 2's 37), remote workday (70 percent vs a load the DELTA 2 can't finish at 105 percent), and tailgate party (51 percent vs 77) — the same pattern that shows up whenever a 1,536Wh unit meets a 1,024Wh one. What's different here is that the DELTA 2's fan noise compounds the capacity gap on the overnight and workday cases specifically.
Neither unit is sized for weekend camping, an 8-hour blackout, or van life daily use, so don't stretch either one past what it's rated for. If those are your real loads, this comparison doesn't apply to you.
What the Specs Don't Tell You
Selected because: Fan noise is the DELTA 2's most documented, most specific complaint.
rated cycles
This is the DELTA 2's defining issue: fans that reportedly trigger above 120W and climb to 48-55dB at full load, described by one reviewer as sounding like a gaming laptop while charging at 1,200WA1A2. EcoFlow was reportedly planning a firmware update to address itA4, but a documented, repeated complaint on a shipping product is worth more weight than a promised fix.
Surge headroom also favors the Jackery here — its 4,000W surge over a 2,000W continuous rating is a 2x cushion, while the DELTA 2's 2,700W surge over 1,800W continuous is 1.5x. That's the number that determines whether a fridge or window AC compressor starts cleanly or trips the inverter.
Growth Path
Selected because: The DELTA 2's expandability is its clearest structural advantage.
solar input
The DELTA 2 accepts expansion batteries; the Jackery is sealed at 1,536Wh permanently. For a buyer who's confident their needs will grow — more gear, longer trips, a partial home-backup plan — that's a real advantage the Jackery can't match.
It's worth less to buyers sizing for what they need today. Unexpanded, the DELTA 2 is still the pricier kWh to own, and it's the noisier unit under load — so the growth path only pays off if you're actually planning to use it, not as a hedge against a decision you could just make correctly now.
Lifetime Value
Selected because: The cheapest unit in the set is still the pricier one per lifetime kWh.
cost / lifetime kWh
At $479 the DELTA 2 is the least expensive unit anywhere in this comparison set, but its 1,024Wh times 3,000 rated cycles works out to 3,072 kWh of total lifetime energy — half the Jackery's 6,144 kWh. That's the entire reason it runs $0.16 per lifetime kWh against the Jackery's $0.11.
By warranty year, it's $96 for the DELTA 2 versus $140 for the Jackery, both over 5 years — the DELTA 2 does win on raw annual cost. But paired with the fan noise and the capacity shortfall on a full workday, the lower number on the sticker doesn't tell the whole ownership story.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Costs $200 less
- +Lighter by 5 lb
- +Faster solar charging
Trade-offs
- –Shorter-lived battery — rated for 3,000 charge cycles vs the Explorer 1500 v2's 4,000, so it wears out sooner.
Jackery Explorer 1500 v2
Strengths
- +Larger battery capacity
- +Higher AC output
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$200) than the DELTA 2.
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
Neither unit can fully handle this scenario (needs 2,100Wh). You'd need a higher-capacity station or to cut back on usage.
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
Neither unit
Neither unit can fully handle this scenario (needs 1,645Wh). You'd need a higher-capacity station or to cut back on usage.
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
Explorer 1500 v2
Capacity is a non-issue here — both units run a CPAP's roughly 320Wh night several times over. What decides it is the fan: the Jackery is rated a flat 30dB, while the DELTA 2's fans have been reported to trigger above 120W and climb toward 50dB under any additional load sharing the unit. If this is running near your bed, the Jackery is the quieter choice, and it's not close.
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
Explorer 1500 v2
The DELTA 2 runs out of juice. It only has 870Wh usable, but this scenario needs 910Wh. The Explorer 1500 v2 covers it and still has 26h of phone charging left over.
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
Explorer 1500 v2
Both handle game day, and the Explorer 1500 v2 does it with more in reserve — 51% used against 77%. Tailgating is a light load, so that headroom counts for less here than the 5 lbs you'll actually carry across the parking lot.
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 can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
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 six 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: Explorer 1500 v2 runs 6.4h vs 4.2h.
$699 list · direct from Jackery
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 0–87hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–17.4hHigh-Draw Appliances
These reveal the real limitsscale 0–1.3h¹ 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
July 14, 2026
Verdict: the Explorer 1500 v2, on Power Score margin
Take the Jackery Explorer 1500 v2. It wins CPAP overnight, remote workday, and tailgate party on capacity headroom the same way it beats every 1kWh-class EcoFlow here, but this pairing has an extra reason to lean Jackery: the DELTA 2's fans are documented to spin up above 120W and climb to 48-55dB under real loadA1A2, loud enough that EcoFlow itself reportedly planned a firmware fixA4. That's a real problem for a unit you might run a CPAP or space heater from at night. The DELTA 2 is $220 cheaper and expandable, which matters if your loads are genuinely small — but on both capacity and quiet operation, the pricier Jackery is the better buy for most people.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 14, 2026. The links below open EcoFlow's and Jackery's current prices.
$699.00 list · direct from Jackery
or check the DELTA 2 price$499.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 14, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
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 4.0/5 (39th percentile of 24 Everyday-class units), and Explorer 1500 v2 rates 4.6/5 (78th percentile of 24 Everyday-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
DELTA 2: documented fan noise above 120W
Reviewers consistently report the DELTA 2's fans triggering above roughly 120W of load and climbing to 48-55dB at maximum output — loud enough that EcoFlow was reportedly planning a firmware fix. The Jackery's rated 30dB doesn't carry the same trigger point. If the unit will run near where you sleep or work, this is worth weighing as heavily as the price gap.
Explorer 1500 v2: Fixed Capacity
The Explorer 1500 v2 is sealed at 1,536Wh — a complete unit, and already larger than the DELTA 2's 1,024Wh. The DELTA 2 can add expansion batteries, but that only pulls ahead if you'd grow past 1,536Wh.
Surge Power: Inverter Quality Indicator
The Explorer 1500 v2 has a 2× surge-to-continuous ratio vs the DELTA 2's 1.5×. A higher ratio (≥2×) means the inverter handles motor startup surges better. That's critical for fridges, AC compressors, and power tools that briefly draw 2-3× their rated wattage. The DELTA 2 may trip when starting these appliances even though its continuous wattage looks sufficient.
Warranty Value Comparison
The DELTA 2 gives you 10 years of warranty per $1,000 spent, vs the Explorer 1500 v2's 7.2 years. That's 1.4× more coverage per dollar. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The Explorer 1500 v2 is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. After hitting the cycle limit, the battery doesn't die. It drops to ~80% original capacity, which is still very usable.
Full record above — the Test Desk pick is the Explorer 1500 v2.
Check Explorer 1500 v2 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 Explorer 1500 v2 is cheaper to own. At $0.11/kWh over its lifetime vs $0.16/kWh, the Explorer 1500 v2'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. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Jackery
Ecosystem
12-15+ models across Explorer (portable) and HomePower (home backup) series, plus SolarSaga panel ecosystem and innovative form factors
Support
US-based support but widely criticized. Reddit reports describe slow/dismissive responses, scripted AI agents, strict receipt requirements for warranty claims, and refurbished replacements for clearly defective units. Strongly recommended: buy from Costco or Amazon for return protection.
Community
Smallest community of the major brands — Reddit r/Jackery has ~2,000 members. YouTube presence is solid due to brand recognition.
App experience
Rated 2.3-3.3/5 iOS and Android — the weakest app experience of the major brands. Multiple confusing apps (Jackery app vs Jackery Home) and mandatory login even offline.
Unique strength
Highest brand recognition and widest retail distribution (Costco, Home Depot, Best Buy, Amazon). The "Toyota" of power stations — dependable, proven, wide availability. Innovative form factors like the Solar Gazebo and Solar Mars Bot.
Worth knowing
A couple of older models still ship NMC chemistry with a shorter rated lifespan, so check the cycle rating on the specific unit — though most of the current line has moved to LFP. Generally perceived as overpriced for the specs offered compared to newer competitors. App experience is significantly behind rivals.
Analyst note
EcoFlow and Jackery are close competitors. Both have established support channels and growing ecosystems. Compare their specific warranty terms and community size for your peace of mind.
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.
Explorer 1500 v2
FIXED CAPACITYFixed at 1,536Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 400W 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
Don't read the DELTA 2's expandability as a straight win here: it starts at 1,024Wh, below the Explorer 1500 v2's 1,536Wh, so a first expansion battery largely buys back capacity the Explorer 1500 v2 already includes. It only pulls ahead if you'd grow past 1,536Wh — short of that, the Explorer 1500 v2's larger fixed capacity is the simpler value.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 2
Fan noise is the dominant, most consistently repeated complaint about the DELTA 2 — reviewers describe the fans triggering above 120W and running continuously at roughly 48-55dB at maximum load, which means running medical equipment above that threshold in a bedroom means either listening to the fans or routing a cable out of the roomA1. Charging at 1,200W has been compared to the sound of a gaming laptop under loadA2.
After 18 months of real-world testing, the same unit earned praise for fast charging, reliable LiFePO4 chemistry, and its expansion optionA3 — this is a capable, well-liked battery with one specific, well-documented flaw. EcoFlow reportedly indicated a firmware update was planned to address the noise, consistent with how it's handled similar issues on other modelsA4, though that fix wasn't confirmed as shipped in the reporting available.
“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
Jackery Explorer 1500 v2
Across reviews, the Explorer 1500 v2's calling card is what it doesn't ask you to give up for the price: at $699 it's described as the lowest cost-per-watt 1.5kWh LFP unit on the market, with a roughly 64-minute full chargeB3. One outlet scored it 8.7 out of 10, calling it the most cost-efficient path to serious LFP capacity for buyers who don't need rugged or waterproof extrasB4 — a framing that lands squarely against a cheaper, noisier rival like the DELTA 2.
It backs that up with practical details: seven simultaneous outputs including dual USB-C mean a laptop, a phone, and a 12V accessory can all run at once without a single outlet doing double dutyB2, and it's class-leading light at about 32 lbsB1. Nothing in the available coverage flags fan noise as an issue on this unit.
“The world's lightest 1.5kWh LFP power station at about 32 lbs — class-leading weight is one of its defining features.”
Sources
backuppowerhub.com · jackery.com · portablepowernerd.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]
- Class-leading light weight, a versatile 7-port layout, fast ~64-minute charging, and the lowest cost-per-watt in its class are the consistent praise. [Explorer 1500 v2 · 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
“The world's lightest 1.5kWh LFP power station at about 32 lbs — class-leading weight is one of its defining features.”
backuppowerhub.com / jackery.com — Explorer 1500 v2 review · 2026 · [positive]
- B2
“Seven simultaneous outputs is genuinely useful: three AC outlets cover larger appliances, dual USB-C ports support fast charging for phones and laptops, and the DC car output handles 12V accessories without burning an AC outlet.”
portablepowernerd.com / backuppowerhub.com — Explorer 1500 v2 review · 2026 · [positive]
- B3
“At $699 it's the lightest, fastest-charging, and lowest cost-per-watt 1.5kWh LFP station on the market, undercutting comparable LFP units, with a roughly 64-minute full charge.”
backuppowerhub.com — Explorer 1500 v2 review · 2026 · [positive]
- B4
“Earns 8.7/10; for buyers who don't need rugged or waterproof features, it's the most cost-efficient path to serious LFP capacity in 2026.”
backuppowerhub.com / portablepowernerd.com — Explorer 1500 v2 review · 2026 · [positive]
Research compiled July 14, 2026.
Who Should Buy Which
Buy the DELTA 2 if you…
- →Your loads are genuinely small — light electronics, no medical equipment overnight — where the fan noise won't come up often.
- →You want the lowest price in this entire comparison set and can tolerate a firmware fix that may or may not be shipped yet.
- →You want room to expand the battery later rather than buying bigger today.
Buy the Explorer 1500 v2 if you…
- →You're running a CPAP, sleeping near the unit, or otherwise need quiet operation at 30dB rather than a fan that can hit 48-55dB.
- →You work off the unit for a full day, host a tailgate, or otherwise need the extra capacity headroom.
- →You want the lower cost per lifetime kWh, even at a higher purchase price.
If neither fits
Weekend camping, an 8-hour blackout, and van life daily use all exceed both units' capacity on their own — if that's your real use case, look at a 2kWh-plus unit instead of either of these.
The Bottom Line
The DELTA 2 is $220 cheaper and expandable, but it carries the most specific, most repeated complaint on this whole page: fans that reportedly climb to 48-55dB the moment load crosses 120W, loud enough that EcoFlow was said to be planning a fix for it. The Jackery's flat 30dB rating and its extra 512Wh of capacity both point the same direction.
For CPAP nights, workdays, and tailgates — the loads these units actually get bought for — take the Jackery. Take the DELTA 2 only if your loads are genuinely light, the noise won't bother you, and the lowest price in this comparison matters more than either capacity or quiet.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
EcoFlow DELTA 2 vs Jackery Explorer 1500 v2 — which should I buy?
The Jackery for most buyers: it's quieter (30dB rated versus a DELTA 2 that's documented to hit 48-55dB under load), and it wins CPAP overnight, remote workday, and tailgate party on capacity. The DELTA 2 is the cheapest unit in this comparison at $479 and is expandable, which is worth it if your loads are small and you don't mind the fan noise.
How loud does the DELTA 2's fan actually get?
Reviewers report the fans trigger above roughly 120W of load and climb to 48-55dB at maximum output, with one comparing 1,200W charging to the sound of a gaming laptop. EcoFlow was reportedly planning a firmware fix, consistent with how it's handled similar complaints on other models, but that wasn't confirmed as resolved. The Jackery is rated 30dB with no noted trigger point.
Is the DELTA 2 cheaper to own long-term?
No. It's $220 cheaper up front, but its smaller 1,024Wh battery and 3,000-cycle rating give it 3,072 kWh of total lifetime output — half the Jackery's 6,144 kWh. That works out to $0.16 per lifetime kWh for the DELTA 2 against $0.11 for the Jackery, so the more expensive unit up front ends up cheaper per unit of energy delivered.
Which one should I use for a CPAP?
The Jackery is the safer bet if the unit will be in the room with you overnight. It's rated 30dB flat, while the DELTA 2's fans reportedly trigger above 120W and can reach 48-55dB — a CPAP alone might stay under that threshold, but add anything else running on the same unit and the fan noise becomes a real factor at 2 a.m.
Where to buy
EcoFlow DELTA 2
$499.00
$499.00 list · direct from EcoFlow
Jackery Explorer 1500 v2Pick
$699.00
$699.00 list · direct from Jackery
Prices may vary by retailer and are subject to change.