Head-to-head test
EcoFlow DELTA 2 vs Jackery Explorer 500
The Explorer 500 costs $140 less today and about $1.23 more per lifetime kWh for every year after that — cheap to buy, expensive to keep.
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 500
1,473Power Score · Device Hub
$359.00 list · direct from Jackery
Spec deltas
Take the EcoFlow DELTA 2 over the Jackery Explorer 500, and the $140 price gap is the least interesting number on this page. The DELTA 2 holds nearly 2x the capacity, delivers more than 3x the continuous output, and carries a 2,700W surge rating against the Explorer 500's 1,000W ceiling. That last gap decides whether a higher-draw appliance starts at all, not just how long it runs.
Run the lifetime math and the Explorer 500's discount disappears fast. $0.16 per kWh over the DELTA 2's life against $1.39 for the Explorer 500, and a 5-year warranty against a 2-year one. The scenario testing points the same way: across six real-world loads, the Explorer 500 never wins outright, and the two scenarios it does lose — CPAP Overnight and Tailgate Party — aren't close.
The honest caveats live here too. Four of six scenarios come back 'neither': Weekend Camping, an 8-Hour Blackout, a full remote workday, and Van Life Daily all ask for more energy than either unit stores, so don't buy either one expecting to ride out a real multi-day event. And the DELTA 2 isn't spotless — its fans are the one recurring complaint in owner reports, loud enough under load to matter if it's living next to a bed or a deskA1A2.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
solar input
The DELTA 2 carries 5x the solar input on top of nearly 2x the capacity, so across a multi-day outage it actually keeps pace with a single day of sunlight. The Explorer 500 falls further behind every cloudy afternoon it loses.
DELTA 2 takes up to 500W of solar input against the Explorer 500's 100WDELTA 2 holds 1,024Wh versus the Explorer 500's 518WhA full solar recharge on the Explorer 500 takes about 7.4 hours
Why it mattersAnyone planning to run either unit off-grid for more than a day should weigh solar input as heavily as capacity — the Explorer 500's battery isn't the only small thing about it; its refill rate is too.
continuous output
That's a different failure mode than the one built into the Explorer 500's 500W/1,000W ceiling. A single higher-draw device can refuse to even start on the Explorer 500 regardless of how much charge is left, while the DELTA 2's 2,700W surge clears that bar for nearly anything portable. The Explorer 500 can fail a scenario two different ways — out of watts, or out of watt-hours. The DELTA 2 only ever fails the second one.
DELTA 2 outputs 1,800W continuous with a 2,700W surge ratingExplorer 500 outputs 500W continuous with a 1,000W surge ratingWeekend Camping needs 2,100Wh and both units fall short, using 241% and 477% of usable capacity on the DELTA 2 and Explorer 500
Why it mattersIf your use case includes any single device pulling close to 500W, check its startup surge against the Explorer 500's 1,000W ceiling before you even do the Wh math — it can be a hard no regardless of price.
cost / lifetime kWh
A 6x gap in rated cycles turns into an 8x-plus gap in real cost per kWh once you divide each unit's price by what it actually delivers over its life. The Explorer 500's $140 discount at checkout is gone within a year or two of daily use, and it's a growing debt after that.
DELTA 2 is rated for 3,000 cycles against the Explorer 500's 500Used daily, that works out to about 8.2 years for the DELTA 2 versus 1.4 years for the Explorer 500Lifetime cost comes out to $0.16 per kWh for the DELTA 2 versus $1.39 for the Explorer 500
Why it mattersAnyone planning daily use, not just occasional camping trips, should mentally add the Explorer 500's short lifespan to its price tag before calling it the budget pick — on a buy-it-today basis it looks cheaper, but it isn't one once you factor in wearing it out and rebuying.
Add app control — remote monitoring, scheduled charging, firmware updates you don't have to plug in for — and a warranty that runs 2.5x as long, and the Explorer 500 isn't behind on one spec. It's behind on the whole feature generation the DELTA 2 belongs to.
DELTA 2 switches to battery backup in 20 milliseconds and includes full app controlExplorer 500 has no UPS switchover spec and no app controlDELTA 2's warranty runs 5 years against the Explorer 500's 2
Why it mattersIf you want this parked under a desk as always-on backup for a router or PC, the Explorer 500 is disqualified outright, not just outgunned — it has no switchover spec to even compare.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: cheaperToOwn favors p1 decisively ($0.16 vs $1.39/kWh) despite the higher sticker price — the strongest single argument on the page.
cost / lifetime kWh
Sticker price says Explorer 500: $359 against $499, a $140 gap that would sway plenty of shoppers on its own. Spread each price over what the unit actually delivers across its life and the gap doesn't just close, it reverses hard. $0.16 per lifetime kWh for the DELTA 2, $1.39 for the Explorer 500.
The warranty math tells the same story from another angle. $100 covered per warranty-year on the DELTA 2 against $180 on the Explorer 500, even though the Explorer 500 is the cheaper unit to buy. A weekend-only user still gets there: 28.8 years of weekends-only use before the DELTA 2's rated cycles run out, against 4.8 for the Explorer 500. This isn't a photo finish that price should decide. It's a rout that price is the only thing keeping close.
Your Life, Your Pick
Selected because: 4 of 6 scenarios are 'neither,' but the pattern behind them (and the two real p1 wins) isn't manufactured — worth walking through in detail.
Four of six scenarios come back 'neither,' and that's not a coin flip being dodged. Weekend Camping, an 8-Hour Blackout, a Remote Workday, and Van Life Daily all ask for more energy than either unit stores. The DELTA 2 comes closer every time — 241% of usable capacity on Weekend Camping against the Explorer 500's 477%, for instance — but closer to enough still isn't enough.
The two scenarios that do resolve show why the DELTA 2 wins the page overall. CPAP Overnight is comfortable for both (37% used on the DELTA 2, 73% on the Explorer 500), but Tailgate Party is where the Explorer 500 actually runs out — 152% of usable capacity against a 670Wh day — while the DELTA 2 finishes it at 77%. Remote Workday is the one worth remembering even though it's scored 'neither': the DELTA 2 needs just 105% of what it holds, the Explorer 500 needs 207%. One of those is a unit you could reasonably stretch with a slightly lighter day. The other isn't close on its best day.
What the Specs Don't Tell You
Selected because: Eight Test Notes fire, the most of any pair this batch. Most separate a current-generation unit from an older one.
rated cycles
Eight Test Notes fire for this pair, more than any other matchup this round, and they cluster into one pattern: nearly every one separates a current-generation unit from an older one. The DELTA 2 takes app control, a 20ms UPS switchover, a 2,700W surge rating, 500W solar input, and 3,000 rated cycles. The Explorer 500 answers with neither of the first two and trails badly on the rest.
The one Test Note that cuts the other way is noise. The DELTA 2 is spec'd at 50 dB under load against the Explorer 500's 37 dB. Owners consistently confirm the DELTA 2's fans are a real, recurring annoyance under sustained draw, not just a paper specA1A2A4. If this unit is living next to a desk or a bed, that's the one honest mark against it on this whole page.
Growth Path
Selected because: DELTA 2's expansion batteries are the only path either brand offers toward covering the bigger scenarios; Explorer 500 has none.
solar input
The Explorer 500's 518Wh is a ceiling, full stop. There's no accessory, no add-on battery, nothing to buy that raises it. The DELTA 2 starts higher at 1,024Wh and can add EcoFlow expansion batteries on top of that, which matters most exactly where both units already come up short: Weekend Camping and an 8-Hour Blackout are 'neither' scenarios today, but only one of these two owners has a path to closing that gap without replacing the whole unit.
That's the honest read on 'expandable' as a feature. It's worth nothing if you never need more than what you bought, and the Explorer 500's fixed 518Wh is genuinely fine for a lot of buyers on that basis alone. But the moment your needs might grow past a single unit's capacity, the DELTA 2 is the only one of these two offering a next step instead of a full repurchase.
Brand Trust
Selected because: Cross-brand pair with a real support/community/app gap worth surfacing given how much ownership-experience content is already on this page.
EcoFlow and Jackery are both major players, but they're not currently peers on software or support experience. EcoFlow's app carries a 4.6/5 iOS rating against Jackery's 2.3-3.3/5 range, and EcoFlow runs the far larger community — about 31K members in its main Reddit community against roughly 2,000 for Jackery.
Support quality is genuinely mixed on both sides. EcoFlow's runs from hassle-free prepaid-label replacements to long waits and refurbished swaps, and Jackery's reputation skews further toward slow, scripted responses and strict receipt requirements. Buying either through Costco or Amazon is the practical hedge, since both brands' own return processes draw real complaints.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 3,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$140) than the Explorer 500.
- –Significantly heavier (+13.7 lbs), making it harder to move.
Jackery Explorer 500
Strengths
- +Costs $140 less
- +Lighter by 13.7 lb
Trade-offs
- –Weaker inverter (-1,300W) limits appliance compatibility.
- –Lacks smartphone app control for remote monitoring.
- –Sealed capacity — the DELTA 2 can add batteries to grow past 518Wh; this one can't.
- –Shorter-lived battery — rated for 500 charge cycles vs the DELTA 2's 3,000, so it wears out sooner.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
SCN-01 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Both units run out before the weekend does. The DELTA 2 needs 241% of its usable capacity, the Explorer 500 needs 477% — roughly twice as much. Neither is sized for this on its own, but the DELTA 2 is at least the one with an expansion path to close the gap.
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
An 8-hour outage needs 1,645Wh. The DELTA 2 needs 189% of its usable capacity to get there and the Explorer 500 needs 374%. Both fall short, though the DELTA 2's 1,024Wh base and expansion option make it the more fixable gap of the two.
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
A full night on CPAP needs about 320Wh — a light 37% of the DELTA 2's usable capacity and 73% of the Explorer 500's. Both handle it fine. The DELTA 2 just does it with far more capacity left over for anything else running that night.
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
Neither unit
A full remote workday needs 910Wh. The DELTA 2 comes close at 105% of its usable capacity, while the Explorer 500 needs 207% — more than double. Neither officially clears it, but one of these is a light day away from working. The other isn't.
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 2
A tailgate day needs 670Wh. The DELTA 2 covers it at 77% of usable capacity; the Explorer 500 runs out at 152%. This is the cleanest split on the page: one unit finishes the day, the other doesn't.
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
Van Life Daily's 4,685Wh a day is a different category of demand entirely. The DELTA 2 needs 538% of its usable capacity and the Explorer 500 needs 1,064%. Neither unit is the right tool here — this scenario calls for a larger expandable system sized to the real daily number.
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: DELTA 2 runs 4.2h vs 2.1h.
$499 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 0–58hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–11.6hHigh-Draw Appliances
These reveal the real limitsscale 0–0.9h¹ 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 28, 2026
Verdict: the DELTA 2, on Power Score margin
The DELTA 2 wins clearly. $140 more upfront buys nearly 2x the capacity, more than 3x the continuous output, and a 2,700W surge that starts loads the Explorer 500's 1,000W ceiling can't touch, plus app control and a UPS switchover the Explorer 500 has neither of. Spread over each unit's real lifespan the gap widens instead of closing: $0.16 per lifetime kWh against $1.39, so the 'cheaper' Jackery is the far more expensive one to actually run. The Explorer 500 still makes sense as the lighter, simpler box for someone who wants one weekend-camping battery and nothing else, but it doesn't out-argue the DELTA 2 on a single other axis.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 28, 2026. The links below open EcoFlow's and Jackery's current prices.
$499.00 list · direct from EcoFlow
or check the Explorer 500 price$359.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 28, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, RV Living, Home Backup, CPAP, Solar Generator, Tailgating, Food Truck.
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 500 rates 3.3/5 (1st percentile of 19 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.
50 dB Is a Max-Load Number, Not a Whisper
The DELTA 2's fans are rated at 50 dB under full load. The Explorer 500 is quieter on paper at 37 dB, partly because it never has to move as much power. If this unit will sit near where you sleep or work, that gap is worth weighing against everything else it does better.
Explorer 500: Solar Recharge Takes 7.4h
At 100W max solar input (realistically ~70W in good conditions), recharging the full 518Wh takes roughly 7.4 hours of direct sun. Not practical for daily off-grid use. You'll need a wall outlet or generator for regular recharging.
Explorer 500: No App Control
Without app control, you have to physically walk to the Explorer 500 to check battery level, adjust settings, or monitor power draw. The DELTA 2 lets you do all that from your phone, including getting low-battery alerts.
1,024Wh Now, or 518Wh Forever
The DELTA 2 starts bigger and can add EcoFlow expansion batteries on top of its 1,024Wh base. The Explorer 500's 518Wh is the whole story. There's no accessory that raises it, so whatever it holds today is what it will always hold.
2,700W vs 1,000W: A Different Class of Surge
Surge rating is what lets an inverter survive a compressor's startup spike, not just its running draw. The DELTA 2's 2,700W surge clears most portable appliance startups outright. The Explorer 500's 1,000W ceiling means some higher-draw devices won't start at all, regardless of how much charge is left in the battery.
Only One of These Has a UPS Mode
The DELTA 2 switches to battery in 20 milliseconds, fast enough that a computer or router riding through a grid blip won't reboot. The Explorer 500 has no switchover spec at all. It isn't a slower UPS. It isn't a UPS.
Warranty Value Comparison
The DELTA 2 gives you 10 years of warranty per $1,000 spent, vs the Explorer 500's 5.6 years. That's 1.8× more coverage per dollar. An underrated factor if you're keeping this unit for years.
3,000 Cycles vs 500, in Real Years
Used every day, the DELTA 2's 3,000-cycle rating works out to roughly 8.2 years before meaningful degradation; the Explorer 500's 500-cycle rating works out to about 1.4. Weekend-only use stretches both — 28.8 years against 4.8 — but the daily-use gap is the one that actually costs money over time.
Full record above — the Test Desk pick is the DELTA 2.
Check DELTA 2 price →or check the Explorer 500 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 Explorer 500 is cheaper to buy, but the DELTA 2 is cheaper to own. At $0.16/kWh over its lifetime vs $1.39/kWh, the DELTA 2's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $1.23 less — check the DELTA 2 price →
Brand trust
EcoFlow
Ecosystem
Twelve to fifteen models deep — DELTA Pro, DELTA 3, RIVER 3, solar panels, and smart home panels — so buying into EcoFlow now means room to add pieces later, not just batteries.
Support
US-based phone, email, and chat support with a genuinely mixed track record: plenty of hassle-free prepaid-label replacements, but also long waits and refurbished units on some claims. Buying through Costco or Amazon adds a return safety net worth having.
Community
The largest community in the category by a wide margin — roughly 31K members in its main Reddit community alone, plus active Facebook groups and an official forum, so troubleshooting help is easy to find.
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest charging technology in the category and the deepest expansion ceiling, up to 180kWh with the right modular setup, far past anything either unit on this page needs.
Worth knowing
EcoFlow recalled the DELTA Max 2000 in October 2025 over an overheating and fire risk tied to six incidents — a different model than the DELTA 2, but worth knowing before buying into the brand. EcoFlow also tested a subscription paywall for advanced app features in early 2025 before backing off after user pushback.
Jackery
Ecosystem
Twelve to fifteen-plus models across the portable Explorer line and the HomePower home-backup line, plus the SolarSaga panel ecosystem — broad, if not as fast-moving as EcoFlow's lineup.
Support
US-based support that skews toward slow, scripted responses and strict receipt requirements in the field, with refurbished units sometimes sent out for what look like clear defects. Costco or Amazon purchase protection is the practical hedge here too.
Community
The smallest community among the major brands — roughly 2,000 members in its main Reddit community — though YouTube coverage stays solid on brand recognition alone.
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
The highest brand recognition and widest retail footprint of any brand here — Costco, Home Depot, Best Buy, Amazon — the dependable, widely-available choice rather than the cutting-edge one.
Worth knowing
This particular unit runs older lithium-ion cells rather than the LiFePO4 chemistry in Jackery's newer models, and the app experience lags the rest of the category: confusing dual apps and a mandatory login even when you're offline.
Analyst note
EcoFlow is the faster-moving, better-supported ecosystem on paper: bigger community, faster charging tech, deeper expansion. Jackery's real edge is retail ubiquity and brand recognition, not the ownership experience once you're past the checkout page.
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 500
FIXED CAPACITYFixed at 518Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 100W of solar. Limited to a single portable panel.
Limited ports. You'll likely need a power strip or splitter.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
The Explorer 500 is sealed at 518Wh, which is fine if that covers you. The DELTA 2 starts at 1,024Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the Explorer 500 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 2
The DELTA 2's fans are the one consistent gripe in the field. They kick in above light loads and run continuously near 50 dB at the top of its output range, loud enough that owners running medical equipment describe either living with the noise or running an extension cable out of the roomA1. Fast-charging draws the same complaint — one reviewer compared it to a gaming laptop under load, though the app lets you throttle charge speed to quiet it downA2.
Past the noise, the reviews are strong. After roughly a year and a half of real use across outages, camping trips, and daily home-office duty, one long-term reviewer credited the DELTA 2 for fast charging, dependable LiFePO4 chemistry, and genuine expandabilityA3. EcoFlow has reportedly said a firmware fix for the noise is planned, worth treating as a maybe rather than a fix in handA4.
“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 500
Field reports are thinner here, since this is the older, established unit, but the read is consistent: a compact, easy-to-live-with station that plenty of owners recommend for weekend-only useB2B3. At 13.3 lbs it's genuinely light to carry, which shows up repeatedly as the reason people liked owning one in the first placeB2.
The catch reviewers keep circling back to is chemistry. This Explorer 500 runs older lithium-ion cells rather than the LiFePO4 pack in Jackery's newer v2 of the same name, and reviewers are explicit that the v2 chemistry is the meaningfully longer-lived oneB4. That tracks with the spec sheet directly — 500 rated cycles here against 3,000 on the DELTA 2 — so budget for a shorter working life, not just a smaller battery.
“518Wh capacity with a 500W output, on traditional lithium-ion cells — Jackery rates 80% capacity retention after 800 cycles.”
Sources
backuppowerhub.com · jackery.com · greencitizen.com · poweredportablesolar.com · batteryessence.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]
- Affordable, portable Jackery entry unit, but on older lithium-ion chemistry with limited cycle life vs newer LFP models. [Explorer 500 · 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]
- B2
“Weighs about 13 lbs — a compact, portable unit.”
greencitizen.com / poweredportablesolar.com — Explorer 500 review · 2026 · [positive]
- B3
“The 518Wh capacity at $449 is the most affordable entry into Jackery's reliable ecosystem — good for weekend warriors and occasional users.”
backuppowerhub.com — Explorer 500 review · 2026 · [positive]
- B4
“An older lithium-ion unit; the newer Explorer 500 v2 uses LiFePO4 rated for far more cycles, offering significantly better longevity.”
batteryessence.com / backuppowerhub.com — Explorer 500 v2 review · 2026 · [mixed]
Research compiled July 28, 2026.
Who Should Buy Which
Buy the DELTA 2 if you…
- →Buy the DELTA 2 if you want one station that comfortably handles CPAP overnight (just 37% of usable capacity for a full night) and can actually grow. EcoFlow's expansion batteries are the only path either brand offers here toward eventually covering Weekend Camping or a real blackout, instead of never.
- →It's also the pick if this unit will sit near a desk, router, or anything you want to keep alive through a grid blip. The 20ms UPS switchover and app control are capabilities the Explorer 500 simply doesn't have, not lesser versions of them.
Buy the Explorer 500 if you…
- →Buy the Explorer 500 if you want the lightest, simplest box on this page for occasional weekend trips — 13.3 lbs, no app to configure, no accessories to think about — and you're genuinely fine with a fixed 518Wh that will never grow.
- →It also fits a true once-in-a-while user who'll never run enough cycles for the DELTA 2's longevity edge to matter. Someone happy to keep this in a closet for a few camping trips a year, not run it as a daily-driver appliance.
If neither fits
Skip both if your real use case looks like Van Life Daily or a true multi-day blackout. The DELTA 2 needs 538% of its usable capacity there and the Explorer 500 needs 1,064%, so this isn't a 'which one' question, it's a 'neither of these' one. Look at a larger expandable station, sized to the actual daily Wh number, not either box on this page.
The Bottom Line
The DELTA 2 costs $140 more and is worth it: nearly 2x the capacity, a 2,700W surge that starts what the Explorer 500's 1,000W ceiling can't, app control and UPS switchover the Explorer 500 doesn't have at all, and a lifetime cost of $0.16 per kWh against $1.39. The Explorer 500 only wins on being lighter and cheaper today — real advantages if this is a once-a-year camping battery, irrelevant if it's anything more.
Buy the DELTA 2 unless your whole use case is occasional, light, and weight-sensitive enough that 13.3 lbs and a lower price actually decide it for you. Fan noise under loadA1A2 is the one honest tax on that pick. Everything else on this page points the same direction.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 2 worth $140 more than the Jackery Explorer 500?
For most buyers, yes. The $140 premium buys nearly 2x the capacity, more than 3x the continuous output, and a lifetime cost of $0.16 per kWh against $1.39 for the Explorer 500 — the DELTA 2 is the cheaper unit to actually own even though it costs more to buy. The exception is someone who wants the smallest, simplest weekend-only unit and won't run enough cycles for the lifetime math to matter.
Can either of these run a CPAP machine all night?
Yes, comfortably. The DELTA 2 uses just 37% of its usable capacity for a full CPAP night and the Explorer 500 uses 73%. The bigger real-world factor is noise: the DELTA 2 is spec'd at 50 dB at max load and owners confirm the fans are audible under sustained draw, though a CPAP's light draw likely keeps it well under that. The Explorer 500 is spec'd quieter at 37 dB, with no comparable field complaints on record.
Does the Jackery Explorer 500 have app control?
No. This unit predates Jackery's app support entirely — no Bluetooth, no remote monitoring, no scheduled charging. The DELTA 2 has full app control, including the ability to throttle charge speed to cut down on fan noise.
Which one should I buy for a power outage?
Neither is really sized for a multi-day outage on its own. An 8-Hour Blackout needs 1,645Wh and both units fall short, using 189% of usable capacity on the DELTA 2 and 374% on the Explorer 500. The DELTA 2 is still the better foundation since it can add EcoFlow expansion batteries later; the Explorer 500's 518Wh is fixed forever. If you need real multi-day coverage today, size a larger expandable station instead of either of these.
Is the Jackery Explorer 500 a bad power station?
Not for what it is. It's a light, affordable, weekend-only unit that plenty of owners are happy with at 13.3 lbs. It's built on older lithium-ion cells with a 500-cycle rating against the DELTA 2's 3,000, though, so it's the wrong pick if you'll use it often enough for that gap to show up in your wallet.
Where to buy
EcoFlow DELTA 2Pick
$499.00
$499.00 list · direct from EcoFlow
Jackery Explorer 500
$359.00
$359.00 list · direct from Jackery
Prices may vary by retailer and are subject to change.