Head-to-head test
EcoFlow DELTA 3 vs Jackery Explorer 300
Whether your heaviest single job fits inside the Explorer 300's 249 usable watt-hours settles this page: it stops 71Wh short of a night on a CPAP, and the DELTA 3 finishes that same night with 550Wh spare.
Full profiles: EcoFlow DELTA 3 → · Jackery Explorer 300 →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
$629.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
$259.00 · direct from Jackery
Last checked 8 hours ago. Prices move — check before you buy.
Spec deltas
The Explorer 300 holds 293Wh and pushes 300W. The DELTA 3 holds 1,024Wh, pushes 1,800W, and has 3,600W of surge behind it. At $259 against $629 these aren't two versions of the same product; they're a battery you carry in one hand and a station that covers a 670Wh afternoon with 200Wh still in reserve.
Take the DELTA 3. The tell is the CPAP row: the night asks for 320Wh, and the Explorer 300 gets about 78% of the way there before it quits, 71Wh short. Failing at 78% is the worst kind of failing, because it doesn't happen at hour one where you'd notice. It happens in the small hours.
The Explorer 300 does own one row on this page, and it owns it cleanly. An afternoon off-grid is 100Wh of phones and a speaker, which it finishes at 40% used while weighing 7.1 lbs against 27. If that describes every trip you take, the DELTA 3 is 19.9 extra pounds of capacity you'll carry and never touch. That's a real case. It's also the only one here.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
For a CPAP that shortfall isn't a thin margin, it's an appointment. And the gap widens at home: plug the machine into the Explorer 300 as a bridge and a grid drop stops therapy until you wake up and do something about it, while the DELTA 3 can sit inline between wall and machine and cover the same 320Wh night with 550Wh untouched.
Explorer 300: 293Wh nameplate, which the flat 85% usable derate takes to 249Wh.The CPAP Overnight profile needs 320Wh.The Explorer 300's spec sheet lists no UPS mode; the DELTA 3 is rated to hand over at no worse than 10ms.
Why it mattersAnyone buying this for bedside medical gear should stop reading the price column and buy the DELTA 3.
continuous output
That's the failure mode you want least, the one that looks like success for the first few seconds. A unit that flatly refuses a load teaches you something in the driveway. A unit that starts it and drops it teaches you at the tailgate, with the blender half full.
Explorer 300: 500W surge over a 300W continuous rating, a 1.7x ratio.The Tailgate Party profile peaks at 400W.DELTA 3: 3,600W surge over 1,800W continuous, a 2x ratio, and it closes the same 670Wh day with 200Wh spare.
Why it mattersIf anything on your list has a motor or a heating element, 300W is your real ceiling on the Explorer 300, not the 500W on the box.
rated cycles
That gap comes from multiplying two things that both run the same direction, energy per cycle and cycles available, so no discount narrows it. Neither battery dies at its rated number, they both settle toward 80% and keep working, but at a cycle a day the Explorer 300 reaches 800 in a bit over two years. The honest counter is that a cycle on it is only 293Wh, so a buyer pulling 100Wh on an afternoon isn't spending cycles at anything like that rate.
Explorer 300: 293Wh per cycle across 800 rated cycles, roughly 234 kWh of lifetime energy, at $259.DELTA 3: 1,024Wh per cycle across at least 4,000 rated cycles, roughly 4,096 kWh, at $629.Rated life on both ends at about 80% of original capacity, not at zero, and a cycle a day works out to 2.2 years against 11.
Why it mattersWork the unit, daily or weekly for years, and the DELTA 3 is the cheaper purchase outright. Leave it in a closet between three trips a year and the lifetime math never gets to speak.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Four of the seven load profiles come back as neither unit, and the three that don't are what decide this matchup.
Four of the seven profiles below come back as neither unit, and that is the correct answer rather than a broken one. A 293Wh battery and a 1,024Wh station are both small. Asking either to cover 4,685Wh of van life is asking the wrong question twice. What these rows are actually good for is locating the line where one stops and the other keeps going.
That line sits between 249Wh and 870Wh of usable energy, and two rows straddle it. The CPAP night needs 320Wh: the DELTA 3 clears it with 550Wh spare, the Explorer 300 lands 71Wh short. A 670Wh tailgate is the same story with a twist, since the Explorer 300 can start its 400W peak on 500W of surge and then has only 300W continuous to hold it. Read the neither rows as advice to shop bigger, and the two rows the DELTA 3 wins as the reason not to shop cheaper.
Lifetime Value
Selected because: Rated lifetime energy is 4,096 kWh against 234 kWh, which is what turns the cheaper unit into the expensive one.
cost / lifetime kWh
Thirteen cents per lifetime kilowatt-hour against a dollar ten. It's the widest gap anywhere on this page, and it comes from multiplying two figures that both favor the DELTA 3: 1,024Wh moved per cycle against 293Wh, over at least 4,000 rated cycles against 800. That's 4,096 kWh of rated energy against 234 kWh.
The years are the part buyers feel. Cycle each unit once a day and the Explorer 300 reaches its rated 800 in 2.2 years while the DELTA 3 takes 11 to reach 4,000, and neither one dies at the number, since rated life ends near 80% of original capacity with a working unit on the other side. The counter-argument deserves saying out loud: a cycle on the Explorer 300 is only 293Wh, so someone drawing 100Wh on a Saturday afternoon isn't burning cycles at that rate, and their unit will long outlive the math. Work it and the DELTA 3 is cheaper. Store it and this whole section is moot.
Portability & Form Factor
Selected because: 7.1 lbs against 27 lbs is the Explorer 300's entire case, and it is a real one.
weight
7.1 lbs is a pannier, a daypack, a one-handed lift out of the back seat without thinking about it. 27 lbs is one person with two hands and a moment of planning, which isn't a complaint on a box holding 1,024Wh against 293Wh, but it does decide where the unit lives. The Explorer 300 comes with you. The DELTA 3 waits in the car or the house.
Density isn't the argument, by the way. Divide capacity by weight and the two land close to each other, so the Explorer 300 isn't the more efficient package, only the smaller one. What matters is the absolute figure, 19.9 lbs of difference, because that's the number that decides whether the thing gets carried at all. This is the one spec on the page where no amount of capacity helps the DELTA 3.
What the Specs Don't Tell You
Selected because: Only one of these two lists a UPS mode, and only one surges past 500W.
rated cycles
The UPS card is the one to read twice. The DELTA 3 can sit between the wall and your gear and hand over when the grid drops, rated at no worse than 10ms, which is a ceiling on a spec sheet rather than a stopwatch reading, and quick enough on paper that a router or a desktop should ride through. The Explorer 300 lists no UPS mode at all, so anything plugged into it during an outage waits on your reaction time.
Two of the other cards cut against the reflex to read them as a scorecard. App control earns its keep on a station parked in a basement and earns almost nothing on one sitting at arm's length, which is where a 7.1 lb battery lives. And the DELTA 3's expansion path is real but modest in ambition: from a 1,024Wh base it adds hours to the same loads, not a backed-up house. The surge card is the one that moves the verdict. 3,600W against 500W is the difference between a unit that starts a compressor without discussion and one you have to check every startup draw against first.
Brand Trust
Selected because: Jackery's own caution about checking the cycle rating on a specific unit lands directly on this one: 800 cycles.
The brand difference that matters here isn't support quality, because neither record is reassuring. It's Jackery's own caution: a couple of its older models still ship the shorter-lived chemistry, so check the cycle rating on the specific unit rather than trusting the line to have moved on. Run that check here and it returns 800 cycles against the DELTA 3's at-least-4,000. The caveat isn't hypothetical on this page. It is the page.
Everything else splits the way the app stores would predict. EcoFlow's app sits above 4 out of 5 on both platforms against Jackery's 2.3 to 3.3, and r/Ecoflow_community runs about 31,000 members against roughly 2,000 in r/Jackery, which is the practical difference when you need someone who has already solved your problem at 11pm. Jackery's genuine edge is the shelf: Costco, Home Depot, Best Buy, Amazon, today. Buy from one of those either way, because a returns desk beats either company's warranty queue.
Strengths & trade-offs
EcoFlow DELTA 3
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$370) than the Explorer 300.
- –Significantly heavier (+19.9 lbs), making it harder to move.
Jackery Explorer 300
Strengths
- +Costs $370 less
- +Lighter by 19.9 lb
Trade-offs
- –Weaker inverter (-1,500W) limits appliance compatibility.
- –Lacks smartphone app control for remote monitoring.
- –Sealed capacity — the DELTA 3 can add batteries to grow past 293Wh; this one can't.
- –Shorter-lived battery — rated for 800 charge cycles vs the DELTA 3's 4,000, 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 seven 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 covers this scenario's 2,100Wh: the DELTA 3 comes up 1,230Wh short (about 41% covered), the Explorer 300 1,851Wh (12%). 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 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
Both units lose this row, and the DELTA 3 loses it by 775Wh. 1,645Wh over eight hours comes out a little over half covered on the bigger unit and 15% on the smaller one, so the honest answer here is neither. If riding out an outage is why you're shopping, the real choice in front of you is a much larger station, with one of these two as the light second unit for the phones.
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 3
320Wh is what the night asks for, and the Explorer 300 brings 249Wh of usable energy to it. That's 71Wh short, about 78% of the night, and the missing part is the end of it. The DELTA 3 finishes with 550Wh untouched, and it's the only one of the two that lists a UPS mode, so at home it can also sit between the wall and the machine. For a bedside unit, this row is the whole decision.
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
Neither unit finishes this one, but only one of them is close. 910Wh needed against 870Wh usable leaves the DELTA 3 40Wh short, which is a trimmed appliance or an evening that ends a little early. The Explorer 300 is 661Wh short, and that isn't a trim, it's a different purchase. Treat this row as the DELTA 3's ceiling and as the Explorer 300's answer.
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 3
The Explorer 300 will start the 400W peak here and then fail to hold it. 500W of surge gets the load moving and a 300W continuous rating is what has to carry it, which is the failure mode that looks like success for the first few seconds. The DELTA 3 runs 1,800W flat and closes the 670Wh day with 200Wh spare.
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 3 comes up 3,815Wh short (about 19% covered), the Explorer 300 4,436Wh (5%). 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
SCN-07 · an afternoon · needs 100Wh
Afternoon Off-Grid
Phones and a speaker at the park, beach, or campsite — the small-unit job description
Either unit
This is the Explorer 300's row and it takes it. 100Wh across an afternoon is phones and a speaker, which it finishes at 40% used with 149Wh still in the tank. The DELTA 3 covers it too, at 11% used, and that's the problem: 27 lbs hauled out for a job 7.1 lbs already does. When the whole day's draw is this small, capacity stops being headroom and becomes luggage.
Battery budget usedlower = more headroom
LOAD Phone Charger (×2) 30W×2h · Bluetooth Speaker 10W×4h
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 3 runs 4.2h vs 1.2h.
$629 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
September 13, 2026
Verdict: the DELTA 3, on Power Score margin
Buy the DELTA 3 at $629. It finishes the two load profiles here that a buyer of either unit plausibly has, a 320Wh night on a CPAP with 550Wh left over and a 670Wh tailgate with 200Wh left over, and the Explorer 300 finishes neither, missing the CPAP night by 71Wh and the tailgate by 421Wh. It is also the cheaper unit to own by any measure that outlasts the checkout page: 4,096 kWh of rated lifetime energy against 234, which works out to thirteen cents per lifetime kilowatt-hour against a dollar ten, plus five years of warranty against two. Confidence sits at 8 rather than 9 for one honest reason. If your loads genuinely live under 249Wh, the Explorer 300 wins on the only axis left, which is the 19.9 lbs you don't carry.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 13, 2026. The links below open EcoFlow's and Jackery's current prices.
$629.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
or check the Explorer 300 price$259.00 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated September 13, 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, 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 3 rates 4.4/5 (65th percentile of 27 Everyday-class units), and Explorer 300 rates 3.6/5 (19th percentile of 22 Personal-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.
An App for the Unit You Can't See
Phone monitoring and low-battery alerts earn their keep on a station parked in a basement or a garage, which is where a 27 lb DELTA 3 tends to end up. The Explorer 300 has none of that, and at 7.1 lbs it is almost never out of arm's reach, so walking over to read the screen is the entire inconvenience. Score this a genuine point for the DELTA 3, and a small one.
Expansion Here Buys Hours, Not a House
The Explorer 300 is sealed at 293Wh, and the DELTA 3 does take EcoFlow expansion batteries. Keep the scale honest, though: from a 1,024Wh base, adding a battery means longer runtimes on the same loads, not a step up to whole-home backup. It's a genuine advantage for someone whose evenings keep getting longer. It is not the reason to buy this unit.
500W Is the Number to Check, Not 1.7x
Ratios are a proxy; ceilings are what motors actually meet. The DELTA 3's 3,600W over 1,800W clears the 2x rule of thumb for absorbing a compressor startup with room left. The Explorer 300's 1.7x is less interesting than its absolute ceiling of 500W, so take the heaviest motor you plan to start, find its startup draw, and hold it against 500W rather than assuming it either sails through or trips.
The Only UPS Mode Here Is on the DELTA 3
Rated at no worse than 10ms, which is a ceiling on a spec sheet rather than a stopwatch reading. That's quick enough on paper for a router or a desktop to ride a grid drop without rebooting, and it's the reason a CPAP user would want this unit rather than the other one. The Explorer 300 lists no UPS mode, so gear plugged into it during an outage waits for you to notice.
Five Years Against Two
A three-year difference in coverage on units you'd expect to keep for years. One practical note: terms quoted in this category are usually the maximum available and can depend on registering the unit with the maker, so whichever you buy, register it the day it arrives rather than the day something goes wrong.
Count Energy, Not Years
4,000 rated cycles against 800 reads as 11 years against 2.2 at a cycle a day, but those two cycles aren't the same size: 1,024Wh on one unit, 293Wh on the other. Lifetime energy is the fair figure, roughly 4,096 kWh against 234 kWh. And neither battery dies at its number. Rated life ends near 80% of original capacity, which is still a working station.
Full record above — the Test Desk pick is the DELTA 3.
Check DELTA 3 price →or check the Explorer 300 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 300 is cheaper to buy, but the DELTA 3 is cheaper to own. At $0.15/kWh over its lifetime vs $1.1/kWh, the DELTA 3's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $0.95 less — check the DELTA 3 price →
Brand trust
EcoFlow
Ecosystem
The deepest catalog in portable power, 12 to 15 models across the DELTA Pro, DELTA 3 and RIVER 3 lines, plus panels and smart home panels. In practice that means the accessory you want in two years probably exists.
Support
US phone, email and chat, with a record that splits sharply: some claims close with a prepaid label and no argument, others drag on and come back refurbished. Buying through Costco or Amazon gives you a return window that doesn't depend on which of those you get.
Community
About 31,000 people in r/Ecoflow_community, several Facebook groups, and an official forum. That's the practical difference when you need someone who has already solved your exact problem at 11pm.
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
X-Stream fast charging and the quickest release cadence in the category. The whole-home story lives at the top of the range on the DELTA Pro Ultra platform, not in a unit like this one.
Worth knowing
EcoFlow tested paywalling advanced app features in early 2025 and paused the plan after community backlash, and it offers no parts or service once the warranty is up. Both are worth knowing before you make the app central to your plan.
Jackery
Ecosystem
12 to 15 plus models across the Explorer and HomePower lines with the SolarSaga panel range, and the widest retail footprint in the category: Costco, Home Depot, Best Buy, Amazon.
Support
US-based and widely criticized, with strict receipt requirements on warranty claims. The workaround is the same one that applies to every brand here: buy it somewhere with its own returns desk.
Community
Roughly 2,000 people in r/Jackery, the smallest of the major brands, though YouTube coverage is plentiful because the name is so well known.
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
Recognition and availability. You can hold one in a store this afternoon, which is worth something no spec sheet shows.
Worth knowing
Jackery's own caution is the one to apply on this exact unit: a couple of older models still ship the shorter-lived chemistry, so check the cycle rating rather than assuming the line has moved on. This one is rated for 800 cycles. The app is the weakest of the major brands at 2.3 to 3.3 out of 5, with separate Jackery and Jackery Home apps and a mandatory login even offline, which is moot here since the Explorer 300 has no app control at all.
Analyst note
EcoFlow is the better-supported platform in every way you can check without phoning anyone: more models, a much larger community, and an app rated above 4 out of 5 against 2.3 to 3.3. Jackery's edge is that it's on a shelf near you. Neither company's support record is a reason to relax, so buy from a retailer with a real returns desk and keep the receipt.
Growth path
DELTA 3
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 300
FIXED CAPACITYFixed at 293Wh, 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 300 is sealed at 293Wh, which is fine if that covers you. The DELTA 3 starts at 1,024Wh and can grow beyond it with EcoFlow expansion batteries — though at this size expansion means longer runtimes on the same loads, not a path to home backup. More hours, not more house.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3
Field evidence on the standard DELTA 3 is thin, and what exists is published testing rather than long-term ownership, most of it covering the Plus, Max and Ultra variants instead of this modelA0. The finding that does belong to the standard unit is about noise: under 200W the fans often don't spin at all, and between 500W and 800W they're barely audible from three feet awayA1. For a box that might end up beside a bed or a desk, that's the single most useful thing anyone has published about it.
The UPS handoff has been watched doing its job, with routers not resetting and CPAP therapy not interrupting, but that testing was on a sibling unit sharing the same rating rather than on this SKU, so it reads as character and not as proof for what you'd be buyingA0A2.
“At low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”
Sources
portablepowernerd.com · thesolarlab.com · outputreport.com
Jackery Explorer 300
The Explorer 300's ledger is small and clean, and it describes exactly the job its specs point at. One owner ran phones, a speaker, a fan and an air mattress through a camping trip and called it easy, light and quietB3. Another recharged several devices a day and kept small-wattage gear going for about two weeks before the charge got lowB4. Both accounts describe the same shape of day: little loads, no drama, nothing with a motor in itB3B4.
One caution about where the rest of that evidence comes from. Two of the strongest-looking entries in this ledger, and the summary built on top of them, describe the Explorer 300 Plus rather than this unit, a different pack at 288Wh with a far higher cycle rating and an extra pound of weightB0. They read like glowing longevity notes for this page and they are not about this page. Our own research resolved this catalog entry against jackery.com to the base Explorer 300: 293Wh, 7.1 lbs, 800 cyclesB0.
“288Wh capacity with 300W output on LiFePO4 chemistry rated for 3,000+ cycles — over a decade of daily use, a major upgrade from the older lithium-ion Explorer 300 (500 cycles).”
Sources
powerstationlab.com · batteryskills.com · voltagebasics.com · rv.com · bestbuy.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
- Light weight, LFP 3,000-cycle longevity, quiet operation, and easy portability are the consistent praise for this small unit. [Explorer 300 · 3 entries]
- A1
“At low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”
portablepowernerd.com — EcoFlow Delta 3 Tested: 2026 Hands-On Review; thesolarlab.com · 2026 · [positive]
- A2
“UPS switchover works as advertised — a power cut results in a ~10ms handoff, fast enough that routers don't reset, fridges don't skip a compressor cycle, and CPAP machines don't interrupt therapy.”
outputreport.com / thesolarlab.com — DELTA 3 line UPS testing (observed on DELTA 3 Plus, which shares the 10ms UPS spec) · 2026 · [positive]
- B3
“One owner powered phones, a speaker, a fan, and an air mattress on a camping trip with no issues, calling it super easy to use, lightweight, and quiet.”
bestbuy.com owner reviews — Explorer 300 Plus · 2026 · [positive]
- B4
“Another owner recharged multiple electronics daily and ran small-wattage devices for about two weeks before reaching a low charge.”
bestbuy.com owner reviews — Explorer 300 Plus · 2026 · [positive]
Research compiled September 13, 2026.
What Owners Actually Report
Drawn from 48 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 3
34 claims from 26 comments · 17 from owners · 7 with figures
- Solar input
- 5 · 27% negative
- Runtime
- 3 · 66% negative
- Price & value
- 4 · 11% negative
- Build quality
- 2 · 100% negative
- Inverter & surge
- 2 · 0% negative
What owners complain about
At 30% charge it ran a 12V cool box for only 30 minutes against a claimed 12 hours at full charge.
Runtimemeasuredowner1 agreedsource →
AC-port surge protection is rated only 150 joules versus 1,800 on his UPS, so he chained both.
Build qualitymeasuredownersource →
Four 12V 100W panels in series give an overload error despite a 60V input rating.
Solar inputmeasuredownersource →
What owners praise
The same pressure washer ran on their DELTA 3 with no errors.
Inverter & surgemeasuredowner1 agreedsource →
Charges 0-100% in 1 hour on 1,000W of solar; 800W takes only 20 minutes longer.
Solar inputmeasuredowner1 agreedsource →
Bought a DELTA 3 from a Costco sale for $389 to replace a 1500VA UPS.
Price & valuemeasuredownersource →
Jackery Explorer 300
29 claims from 22 comments · 20 from owners · 6 with figures
- Runtime
- 9 · 36% negative
- Solar input
- 3 · 0% negative
- Price & value
- 5 · 94% negative
- Durability
- 3 · 8% negative
- Other
- 3 · 53% negative
What owners complain about
Plans to return the day-old Jackery 300 after seeing the EB3A review.
Price & valueowner8 agreedsource →
Metered 235Wh delivered against an advertised 288Wh, about 80% usable.
Runtimemeasuredowner1 agreedsource →
Returning the Jackery 300 bought to run a compressor fridge and ordered an EB3A.
Otherowner2 agreedsource →
What owners praise
Fully charges in 3 hours from a 100W panel in full sunshine.
Solar inputmeasuredowner43 agreedsource →
Has been great for about 3 years and performs better than the budget rival tested in the video.
Durabilitymeasuredownerafter 36 months6 agreedsource →
Enough to run a lamp and a few small items where there is no grid wiring.
Runtimeowner43 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 3 if you…
- →The person plugging in a CPAP. The night costs 320Wh and leaves 550Wh spare, and this is the only one of the two that lists a UPS mode, so at home it can sit between the wall and the machine and hand over at no worse than 10ms.
- →Anyone whose load list has a motor or a heating element in it. 3,600W of surge over an 1,800W continuous rating is the headroom that starts a compressor without a conversation; 500W is the figure you'd otherwise be checking every appliance against.
- →The buyer who will actually cycle the thing, weekly or daily, for years. At least 4,000 rated cycles against 800 is the point where $629 stops being the expensive option.
- →Someone who wants room to add hours later. The expansion path is real, as long as what you want is longer evenings rather than a backed-up house.
Buy the Explorer 300 if you…
- →The day-trip carry. 100Wh of phones and a speaker across an afternoon finishes at 40% used, and 7.1 lbs goes into a pannier or a daypack without a second thought.
- →The person who already owns a big station and wants a light second battery for the tent, the picnic table, or the camera bag.
- →The buyer who wants one in their hands this afternoon. Jackery's retail spread means a store nearby probably has it on a shelf.
- →Anyone whose honest maximum sits well under 249Wh of usable energy. If nothing you own needs more than that, the DELTA 3's extra capacity is 19.9 lbs you'd be carrying for nothing.
If neither fits
Close this tab if you're shopping because of outages. Eight hours of blackout in our profile is 1,645Wh, and the DELTA 3 covers a little over half of it while the Explorer 300 covers 15%. A weekend of camping is 2,100Wh, a day of van life is 4,685Wh, and on that one the bigger unit covers 19% and the smaller 5%. Those buyers want a station several times this size, or a platform designed to stack batteries, and working further down this page only helps you pick the wrong one of two units that both lose. Same answer if a refrigerator has to stay cold overnight: that's a larger station with the solar input to match, not either of these.
The Bottom Line
Take the DELTA 3 at $629. The CPAP row is every argument on this page compressed into one line: 320Wh overnight, 550Wh spare on one unit and 71Wh short on the other, on a night where getting 78% of the way there counts as failing.
The Explorer 300 is still a good small battery, and it keeps the row it deserves, an afternoon of phones and a speaker at 7.1 lbs. Buy it on purpose, for that, and it's the right box. Buy it as a cheaper DELTA 3 and you've bought the expensive energy, a night that ends early, and a 500W ceiling, in exchange for weight you were going to leave in the car anyway. Go get the DELTA 3.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the Jackery Explorer 300 run a CPAP all night?
Not a full night. The overnight CPAP profile here needs 320Wh, and the Explorer 300's 293Wh nameplate comes to 249Wh after the flat 85% usable derate, leaving it 71Wh short at roughly 78% of the night covered. The DELTA 3 covers the same night out of 870Wh usable with 550Wh untouched. It's also the only one of the two that lists a UPS mode, which matters if the machine is plugged in through it at home.
Is the DELTA 3 worth the extra money over the Explorer 300?
If you're going to work it, yes. $629 against $259 buys 1,024Wh against 293Wh, at least 4,000 rated cycles against 800, and five years of warranty against two, which lands at thirteen cents per lifetime kilowatt-hour against a dollar ten. The case for saving the difference is weight and nothing else: 7.1 lbs is a unit you take everywhere, 27 lbs is a unit you plan around.
Will either of these run my fridge during a blackout?
Not for the eight hours our blackout profile asks for. That load is 1,645Wh, and the DELTA 3 comes up 775Wh short at a little over half covered while the Explorer 300 covers 15%. Starting a fridge is a separate question from running one: the DELTA 3's 3,600W surge clears the 2x headroom rule of thumb comfortably, while the Explorer 300 tops out at 500W, so check your compressor's startup draw against that number rather than assuming either result. For real fridge backup, shop a larger station.
How many years will the Explorer 300's battery last?
Its 800-cycle rating works out to 2.2 years at one full cycle a day, or 7.7 years at two cycles a week, and it doesn't stop dead at the number: rated life ends at roughly 80% of original capacity, which is still a usable battery. The DELTA 3's at-least-4,000 cycles is 11 years at the same daily rate. One caution when you read those years side by side, though. A cycle is 293Wh on one unit and 1,024Wh on the other, so the fair comparison is lifetime energy: 234 kWh against 4,096 kWh.
Can you add a second battery to the Explorer 300?
No. It's sealed at 293Wh, so size it for the job up front rather than planning to grow into it. The DELTA 3 does take EcoFlow expansion batteries, but keep the ambition in scale: from a 1,024Wh base, expansion buys longer runtimes on the same loads rather than a home-backup system. More hours, not more house.
Brand matchup
EcoFlow vs Jackery: measured across every matchup →Where to buy
EcoFlow DELTA 3Pick
$629.00
$629.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
Jackery Explorer 300
$259.00
$259.00 · direct from Jackery
Last checked 8 hours ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.