Head-to-head test
EcoFlow DELTA Pro Ultra + 2 Batteries vs Jackery Explorer 500
These two aren't rivals: 405.4 lbs of installed backup against 13.3 lbs you carry in one hand, so the only question that matters is whether the box has to move, and your load answered that before you got here.
Full profiles: EcoFlow DELTA Pro Ultra + 2 Batteries → · Jackery Explorer 500 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$7,999.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
$359.00 · direct from Jackery
Last checked 13 days ago. Prices move — check before you buy.
Spec deltas
$7,999 buys 18,432Wh that you site once and leave alone. $359 buys 518Wh and a carry handle. That isn't a spec gap you weigh, it's two purchases that happened to land on the same page.
The Ultra has the energy for all six of our scenarios and barely notices them: an eight-hour blackout needs 1,645Wh and leaves it 14,022Wh in hand. The Explorer 500 finishes one of the six, the CPAP night, and ends that with 120Wh to spare. Read those two sentences as a category test rather than a scoreboard, because the Explorer 500 was never built to hold up a house, and the Ultra, at 405.4 lbs across its boxes, was never built to come with you.
So the useful question isn't which one wins. It's which of three buyers you are: the one wiring backup into a breaker panel, the one who wants a battery in the back seat, or the one whose real load sits in the gap between them and is served by neither.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
It ends nothing here, because you only collect that ratio by actually spending 64,512 kWh. Cycled daily, the Explorer 500's 800 cycles come due in 2.2 years and the Ultra runs 9.6; cycled twice a week, the same 800 cycles stretch to 7.7 years. The lifetime-cost figure describes a machine working hard for a decade, not a battery that comes out of a closet on Fridays, and at closet duty it is an argument for spending $7,999 to save pennies on energy you were never going to draw.
DELTA Pro Ultra + 2 Batteries: $7,999, 18,432Wh, rated for at least 3,500 cycles, about 64,512 kWh of lifetime energy at $0.12 per lifetime kWhExplorer 500: $359, 518Wh, rated 800 cycles, about 414 kWh of lifetime energy at $0.87 per lifetime kWhJackery rates the Explorer 500 at 80% capacity retention after those 800 cycles, on traditional lithium-ion rather than LFPB1B4
Why it mattersIf the Explorer 500 is going to be your daily driver, the 800-cycle rating is the thing you're actually buying, and the fix is a unit rated for more cycles rather than a cheaper one. Jackery's own v2 moved to LiFePO4 for exactly that reasonB4.
weight
That's why two of six scenarios have no winner at all. The Ultra holds seven times what a 2,100Wh weekend needs (15,667Wh usable against 2,100Wh) and can't get to the campsite; the Explorer 500 gets there and covers about a fifth of it. Units this far apart don't produce a compromise pick, they produce a gap, and the campsite is sitting in it.
DELTA Pro Ultra + 2 Batteries: 405.4 lbs across its boxes, recorded as stationary, with 3 AC outlets, two 240V outlets and a 30A RV feedExplorer 500: 13.3 lbs, one AC outlet, three USB-A and no USB-CBoth Weekend Camping (2,100Wh) and Tailgate Party (670Wh) come back with no winner
Why it mattersIf the hardware has to travel with you, only one of these is a candidate. If it has to hold up a house, only the other one is. Nobody needs to read further than that.
solar input
So the Explorer 500 is a unit you bring back to a wall outlet. A remote workday draws 910Wh, better than two of its 440Wh usable charges, and each of those refills wants around 5.2 hours of clear sky at a perfect panel angle to come back. Sun can top this unit up. Sun can't run it.
Explorer 500: 100W rated solar ceiling against 518Wh, about 5.2 hours of ideal sun for a full refillDELTA Pro Ultra + 2 Batteries: 5,600W solar ceiling against 18,432Wh, about three and a half hoursRemote Workday needs 910Wh; the Explorer 500's 440Wh usable leaves it 470Wh short
Why it mattersAnyone planning to live off sunlight rather than off a wall socket should treat the Explorer 500 as the wrong end of the catalogue, however good $359 looks.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Six modelled loads, and the Explorer 500 finishes one of them. This is the fastest read on whether either unit fits what you actually run.
The Explorer 500 passes one row of six: a 320Wh CPAP night against 440Wh usable, finishing with 120Wh spare. Everything else ends in a shortfall, and not the kind you manage with a power strip. It's 470Wh short of a remote workday, which means it covers about half the day and stops. It's 1,205Wh short of an eight-hour blackout and 4,245Wh short of a day in a van.
The Ultra's numbers run the other way until they stop being informative, covering that blackout on a tenth of what it holds. The two rows worth your attention are the ones it doesn't win. Weekend Camping and Tailgate Party both come back with no winner, because energy the unit can't bring to the campsite isn't energy you have. If your list of loads is mostly outdoors, the honest answer this page can give you is that you're on the wrong page.
Portability & Form Factor
Selected because: 405.4 lbs gets sited once; 13.3 lbs goes in the back seat. Settle this row and the rest of the page follows.
weight
405.4 lbs arrives as several boxes, which sounds like a reprieve and isn't. You're siting an appliance, and once it's sited it stays, so pick the spot for airflow and access rather than convenience. Moving it later is a project with a second person in it. The Explorer 500 is 13.3 lbs, a full grocery bag: one hand, no plan.
This row is also where the Ultra's port list gives itself away. Three AC outlets, two 240V outlets, a 30A RV feed, and no 12V car socket at all. It's wired like a building. The Explorer 500 has one AC outlet and three USB-A with no USB-C, which is a generation of cable behind and fits in the footwell.
Lifetime Value
Selected because: 3,500 rated cycles against 800 changes what each unit costs per kilowatt-hour it will ever deliver, and whether that figure should matter to you at all.
cost / lifetime kWh
Pennies per lifetime kilowatt-hour is the Ultra's strongest number and the least useful one here. It's an amortization: divide a big price by a huge quantity of energy across 3,500 rated cycles and you get a small quotient. You collect it by cycling the thing for years, which is what a house does to a battery and what a camping trip does not.
The Explorer 500's real cost story is the 800-cycle rating, not the $359. Run it every day and that's 2.2 years before it settles to about 80% of the capacity it started with, still usable, just smaller. Run it a couple of times a week and the rating stops mattering, which is exactly the duty it was built for. Buy it for that duty and it's cheap. Buy it as a daily driver and you've bought a consumable.
What the Specs Don't Tell You
Selected because: Most of the cards here only tell you the Explorer 500 is a small, cheap unit. Two of them change a decision.
rated cycles
Most of the cards firing here are the price tag talking. No app control, fixed capacity, a 100W solar ceiling: a $359 unit not having app control isn't a flaw, it's a $359 unit. Two cards do change a decision.
The first is the 405.4 lbs, which is the line where a whole category of buyer should stop reading. The second is that only the Ultra lists a UPS mode. It sits between the wall and your gear and hands over when the grid drops, a handover EcoFlow classifies as no-break rather than publishing a measured time. Anything on the Explorer 500 rides out an outage as far as your reaction time, and at 3 a.m. your reaction time is not a spec. If the problem you're solving is that the power went out and the router died, that one line is worth more than every capacity figure above it.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra + 2 Batteries
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 3,500 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$7,640) than the Explorer 500.
- –Significantly heavier (+392.1 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
Jackery Explorer 500
Strengths
- +Costs $7,640 less
- +Lighter by 392.1 lb
Trade-offs
- –Weaker inverter (-6,700W) limits appliance compatibility.
- –Lacks smartphone app control for remote monitoring.
- –Sealed capacity — the DELTA Pro Ultra + 2 Batteries can add batteries to grow past 518Wh; this one can't.
- –Shorter-lived battery — rated for 800 charge cycles vs the DELTA Pro Ultra + 2 Batteries's 3,500, 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
No winner here, and the reason is physics rather than watt-hours. The Ultra has the energy to run this weekend several times over and 405.4 lbs of reasons it won't be there. The Explorer 500 gets there and quits about a fifth of the way through the 2,100Wh, 1,660Wh short. Two failures with opposite causes.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
DELTA Pro Ultra + 2 Batteries
This is what the Ultra is for: 1,645Wh of outage against 15,667Wh usable, and it holds the handover too, so nothing reboots on the way. The Explorer 500 comes up 1,205Wh short, about a quarter of the night. That's an evening of phones and lamps, not an outage plan.
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 Pro Ultra + 2 Batteries
The Ultra takes this row, but not on capacity. A 40W machine for eight hours is 320Wh, and the Explorer 500 finishes that night with 120Wh to spare. What separates them is the handover: only the Ultra lists a UPS mode, so if the grid drops at 3 a.m. the mask keeps running, while on the Explorer 500 you are the switch. Published noise ratings won't break the tie either way, because the two makers don't measure the same way.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
DELTA Pro Ultra + 2 Batteries
The Explorer 500 doesn't finish — 440Wh usable against the 910Wh this needs leaves it 470Wh short, about 48% of the scenario covered. The DELTA Pro Ultra + 2 Batteries covers it with 14,757Wh to spare.
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
Neither unit
Neither, and this one stings less. The 400W peak sits inside the Explorer 500's 500W rating, so it starts everything you plug in. It just can't finish, covering about two-thirds of the 670Wh day and stopping 230Wh short. The Ultra would run the whole thing and can't be got to 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
DELTA Pro Ultra + 2 Batteries
The Ultra is the only one of these two that covers a van's 4,685Wh day, and it does it on 30% of what it holds. The catch is that 405.4 lbs is a build, not a load-out. This works in a van you're converting around it, packs bolted down and ventilated, and it's dead weight in a van you just wanted to sleep in. The Explorer 500 covers about a tenth of the day, which is a phone-and-lights battery in a build that needs a power system.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: DELTA Pro Ultra + 2 Batteries runs 76.4h vs 2.1h.
$7,999 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 0–1044.5hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–208.9hHigh-Draw Appliances
These reveal the real limitsscale 0–15.7h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
September 13, 2026
Verdict: the DELTA Pro Ultra + 2 Batteries, on Power Score margin
Tie, and not because they're close. The Ultra has the energy for all six scenarios we model and the Explorer 500 finishes exactly one of them, but nobody choosing between a $7,999 installed system and a $359 carry handle is choosing on merit. They are two different purchases that collided in one search box, so decide on the requirement instead. If you need circuits held up when the grid drops, only the Ultra is in the category, and across 3,500 rated cycles it works out to $0.12 per lifetime kilowatt-hour against the Explorer 500's $0.87. If you need a box you can lift into a trunk, the Explorer 500 does a CPAP night, the phones and the laptop for $359 and never asks for a corner of your garage. And if what you actually want is a powered campsite, buy neither of them.
Editor-assigned confidence, based on cited owner research and spec analysis.
Written by Gunner Gustafson, Whole-Home Backup 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): Home Backup, Food Truck, Apartment Balcony, Camping.
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, DELTA Pro Ultra + 2 Batteries rates 3.8/5 (29th percentile of 29 Whole-Home / Off-Grid-class units), and Explorer 500 rates 3.3/5 (1st percentile of 20 Compact-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
405.4 lbs Is a Siting Decision, Not a Lifting One
Nobody carries this. It arrives as several boxes and becomes an appliance the moment you set it down, so choose the spot for airflow, access and a floor you trust. Relocating it later means a second person and an afternoon. If you don't already know which corner it's going in, you're not ready to buy this system.
Explorer 500: Solar Recharge Takes 5.2h+
At its 100W rated solar ceiling, refilling the full 518Wh takes about 5.2 hours of sun — as a floor, since the rated figure assumes ideal panel angle and clear sky, and real days deliver less. Not practical as the primary charge source for daily off-grid use; treat solar as a top-up and plan on a wall outlet or generator.
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 Pro Ultra + 2 Batteries lets you do all that from your phone, including getting low-battery alerts.
The Expansion Gap Decides Nothing Here
Yes, the Explorer 500 is sealed at 518Wh while the Ultra takes extra batteries, and on this pairing that card is noise. The two base units are already more than thirty-five times apart, so if 518Wh doesn't cover you, the answer isn't to expand the Jackery, it's to buy a different size. Expansion matters when you're choosing between units in the same class. These two aren't.
Surge Power: Ratio and Ceiling Disagree
The Explorer 500 holds the higher surge-to-continuous ratio (2× vs 1.5×), but the DELTA Pro Ultra + 2 Batteries holds the higher absolute surge ceiling — 10,800W against 1,000W. These measure different things. The ratio says how much headroom an inverter keeps above its own rating; the ceiling says how big a startup spike it can actually swallow. A motor draws a number of watts at switch-on, not a multiple of someone else's rating, so on raw starting ability the DELTA Pro Ultra + 2 Batteries is the stronger unit here — while the Explorer 500 is the one running further below its own limit at steady state.
Only One of These Rides Out the Outage
The Ultra can sit between the wall and your gear and take over when the grid drops. EcoFlow classifies that handover as no-break rather than publishing a stopwatch figure, so treat it as a design claim you can verify at home with a router and a desk lamp. The Explorer 500 lists no UPS mode, which means anything plugged into it goes dark with the grid and comes back when you do.
Warranty: 10 Years vs 2
The DELTA Pro Ultra + 2 Batteries is covered for 10 years against the Explorer 500's 2 years. The cheaper Explorer 500 does buy more warranty per dollar (5.6 years per $1,000 against 1.3), but that is a statement about price, not about coverage — if a fault appears in year 3, only one of these is still covered. An underrated factor if you're keeping this unit for years.
Rated Cycles, Translated Into Years
3,500 cycles against 800 reads like a spec-sheet quibble until you convert it: at daily use that's 9.6 years against 2.2, after which the smaller pack settles to about 80% of its original capacity rather than dying. Weekend duty stretches both, and it stretches the small one far enough to matter, which is the real advice hiding in this card. Buy the Explorer 500 for occasional use and the cycle rating never bites. Buy it as a daily driver and it's the first thing that will.
Ownership 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 Pro Ultra + 2 Batteries is cheaper to own. At $0.12/kWh over its lifetime vs $0.87/kWh, the DELTA Pro Ultra + 2 Batteries's higher cycle life and capacity make each dollar go further over the years.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US phone, email and chat, and the experience is genuinely polarized: prepaid-label replacements that just work, alongside long waits and refurbished units sent against new claims. Buying through Costco or Amazon gives you a return counter as a backstop, which on a four-figure purchase is worth more than most warranty clauses.
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
The deepest ecosystem in portable power and the fastest charging in it, and at the top of the range the DELTA Pro Ultra platform stacks batteries and inverters toward whole-home backup. That's a flagship path rather than something the rest of the line does.
Worth knowing
EcoFlow tested subscription paywalls for advanced app features in early 2025 and paused the plan after community backlash, and it offers no parts or service once you're out of warranty. On a system you intend to keep for ten years, that second point is the one to sit with.
Jackery
Ecosystem
12-15+ models across Explorer (portable) and HomePower (home backup) series, plus SolarSaga panel ecosystem and innovative form factors
Support
US-based and widely criticized: slow or scripted replies, strict receipt requirements on warranty claims, refurbished replacements for clearly faulty units. The practical workaround is the retail counter, so buy it somewhere with a real return policy.
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
Distribution. Jackery sits in Costco, Home Depot, Best Buy and Amazon, so you can put hands on one this afternoon and take it back next week. On an entry-level purchase that's a genuine feature, not a footnote.
Worth knowing
A couple of older Jackery models still ship the earlier chemistry with a shorter rated life, so the cycle number on the exact unit in the box matters more than the name on the lid. The app is also the weakest of the major brands, with multiple apps and a mandatory login even offline, though on a unit with no app control that costs you nothing.
Analyst note
Different failure modes. EcoFlow gives you the deeper ecosystem, the better app and a support queue that could go either way. Jackery gives you a shelf at Costco and a support queue you'd rather not join. On a $359 unit that retail counter is most of the protection you need. On a four-figure installed system, the question to settle before you buy is what happens after the ten-year warranty ends, since EcoFlow sells neither parts nor service past it.
Growth path
DELTA Pro Ultra + 2 Batteries
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 18,432Wh.
Accepts up to 5,600W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
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 Pro Ultra + 2 Batteries starts at 18,432Wh 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 Pro Ultra + 2 Batteries
Field coverage for this exact two-battery configuration is thin, and we'd rather say so than dress up the little that existsA0: one detailed forum thread, a handful of short retail reviews, and a couple of press installs. What the two-battery owners do agree on is the part that matters most. The handover is invisible, the system genuinely carries household loads including a central air conditioner and a well pump running togetherA9A14A10, and adding the second battery measurably extended real-world backup timeA13.
The complaints cluster in two places. Support answers specific technical questions badly: no real manual beyond a thin web guide, a suggestion to solve radio interference by putting the unit in a faraday cage, and a charting question answered twice by pointing at the wrong app screenA2A4A5. And the hardware wants respect. The expansion batteries are two-person liftsA8, one owner measured about 10 degrees of difference between the stacked packs and worried about a 98-degree garage in summerA11A12, and idle self-consumption surfaces both as an owner's odd state-of-charge behavior and as a tester's spec-level drain figureA6A7. None of that disqualifies a sited installation. All of it argues for putting it somewhere ventilated that you can still reach.
“This means that without any grid or solar input, the system would fully drain its own 6kWh battery in about 60 hours. For off-grid use, this parasitic drain must be carefully factored into your energy budget.”
Jackery Explorer 500
There is no owner ledger to speak of for the Explorer 500. What we have is review write-ups rather than long-term testimonyB0, and they agree on the obvious: about 13 lbs, the cheapest way into Jackery's lineup, aimed at weekend and occasional usersB2B3. Useful, uncontroversial, and not the thing you need to know.
The thing you need to know is the chemistry. This unit runs traditional lithium-ion, with Jackery rating 80% capacity retention after 800 cycles, and the Explorer 500 v2 is the LiFePO4 version rated for far moreB1B4. If you're buying an Explorer 500 today, check which one is in the box before you check the price.
“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
- Owners repeatedly report EcoFlow customer support gives dismissive or unhelpful answers to specific technical questions (manual gaps, RFI interference, app charting). [DELTA Pro Ultra + 2 Batteries · 3 entries]
- The unit's idle/parasitic self-consumption is a recurring theme, both as a documented SoC anomaly and as an acknowledged spec-level drain figure from a tester. [DELTA Pro Ultra + 2 Batteries · 2 entries]
- Multiple owners note the extra battery packs are extremely heavy (100+ lbs each), requiring two people, and one owner separately observed uneven heat between stacked batteries raising summer overheating concerns. [DELTA Pro Ultra + 2 Batteries · 3 entries]
- Real owners with 2-battery setups consistently praise seamless/flicker-free UPS switchover and confirm the system genuinely runs whole-home loads (AC, well pump, most of house). [DELTA Pro Ultra + 2 Batteries · 3 entries]
- Adding a second battery is described by owners as meaningfully extending real-world runtime for whole-home backup, matching expectations. [DELTA Pro Ultra + 2 Batteries · 2 entries]
- Affordable, portable Jackery entry unit, but on older lithium-ion chemistry with limited cycle life vs newer LFP models. [Explorer 500 · 3 entries]
- A2
“No real manual. All they have is the web user guide which is superficial if I'm being generous. I asked support about it and they pointed me at the web guide I was complaining about. Twice.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A4
“I contacted EcoFlow support and they told me I could put it in a 'faraday cage'.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A5
“No State of Charge graph in the app... I contacted support and twice they told me to go to the app screen with the charts, which only has input and output.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A6
“After a few days of using it overnight and letting it charge back up to '90%', it'd go from '90%' down to '8%'.”
DIY Solar Power Forum — 'Ecoflow Delta Pro Ultra issues' thread · 2024-02 · [negative]
- A7
“This means that without any grid or solar input, the system would fully drain its own 6kWh battery in about 60 hours. For off-grid use, this parasitic drain must be carefully factored into your energy budget.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [mixed]
- A8
“The main inverter is a manageable 71 lbs, but each Ultra Smart Extra Battery is a dense 115 lbs, requiring two people for safe movement.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [mixed]
- A9
“We powered a central air conditioner, refrigerator, and well pump simultaneously without a flicker.”
Battery Skills — 'EF ECOFLOW DELTA Pro Ultra + Extra Battery Review' · 2025-10 · [positive]
- A10
“I own two Delta Pro Ultra's with two batteries each... We have experienced matchless performance, scalability, flexibility. It cools/heats itself in temperature extremes-simply awesome!”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A11
“I noticed the battery closest to the inverter seems to run hotter than the one below. About 10 degrees warmer. I switched the batteries around to ensure that it wasn't the battery and got the same results.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [negative]
- A12
“My garage could get up to 98 degrees during the summer, that means my batteries can overheat.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [negative]
- A13
“I originally bought my Delta Pro Ultra with the single battery, worked great is able to power my entire home for about 4 to 5 hours during peak times... I bought a second battery... My run time has doubled eliminating the anxiety.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A14
“With the home panel, there is no flicker when the power changes. I bought a unit with 2 batteries and it runs my most of my house.”
Walmart customer reviews — 'EF EcoFlow Extra Battery for DELTA Pro Ultra' · unknown · [positive]
- A17
“Sure enough, the job went smoothly; it took him around nine total hours to complete, which included cutting out portions of drywall in order to sink the panel into the wall.”
Yahoo Tech — 'EcoFlow Delta Pro Ultra whole home battery backup review' · 2024-06 · [mixed]
- B1
“518Wh capacity with a 500W output, on traditional lithium-ion cells — Jackery rates 80% capacity retention after 800 cycles.”
backuppowerhub.com / jackery.com — Explorer 500 review · 2026 · [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 September 13, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra + 2 Batteries if you…
- →You're backing up a house or a workshop. 18,432Wh, three AC outlets, two 240V outlets and a 30A feed, plus a UPS mode EcoFlow classifies as no-break, so the desktop doesn't reboot and the router doesn't blink. Owners running two batteries describe the switchover as flicker-free while the system carries most of a houseA9A14.
- →You're building, not packing. A van conversion, a cabin, a garage bay: somewhere the boxes get sited once and never lifted again. A van's modelled 4,685Wh day uses 30% of what this holds, so it's the rare mobile setup the system actually suits, as long as mobile means bolted down rather than carried.
- →You keep hardware for a decade. Ten years of coverage and at least 3,500 cycles is a different ownership horizon from anything in the carryable aisle. Budget for the install if you want it feeding circuits rather than extension cords: one reviewer's panel job ran about nine hours and included cutting drywall to sink the panel into the wallA17.
Buy the Explorer 500 if you…
- →You want a CPAP to survive the night and nothing more ambitious. That's 320Wh of machine against 440Wh usable, and it finishes with 120Wh in hand.
- →You want a battery you can lift with one hand to a picnic table, a photo shoot or a kid's sports field, for phones, a laptop, lights and a speaker, and you'll plug it back into a wall between trips rather than chasing the sun with it.
- →You use it occasionally. Reviewers place it as the entry point for weekend and occasional useB3, and at a couple of cycles a week the 800-cycle rating never becomes your problem. $359 buys precisely the box that duty calls for.
If neither fits
You want a powered campsite, a tailgate, or a weekend with a fridge in it. Close the tab cheerfully: one of these two can't travel and the other can't finish, and no amount of reading turns that into a compromise. What you want is a carryable sized to the 2,100Wh weekend we model here, roughly four times the Explorer 500's battery and a small fraction of the Ultra's. It exists, it's a different aisle, and it isn't either of these.
The Bottom Line
Tie, and not because they're close. The Ultra takes four of the six scenarios outright, the Explorer 500 finishes one, and two have no winner at all. That spread isn't a verdict, it's a category test, and whether the box has to move settles it before any other spec gets a vote.
So: breaker panel, back seat, or neither. If you're backing up a house, the Ultra is the only one of these two in the category, and it will still be under warranty long after the Explorer 500's 800 cycles are spent. If you want a battery you carry, the Explorer 500 does the night and costs what a night is worth. And if you came here for a powered campsite, the most useful thing this page can tell you is to go and look somewhere else.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro Ultra with 2 batteries overkill for camping?
It's not overkill, it's the wrong shape. At 405.4 lbs across its boxes this is hardware you site rather than hardware you bring, which is why our camping and tailgate scenarios come back with no winner at all. If your loads are mostly outdoors, shop portables sized to a 2,100Wh weekend instead.
Can a Jackery Explorer 500 get me through a power outage?
Not a real one. Our eight-hour blackout profile needs 1,645Wh and the Explorer 500 holds about 440Wh usable, leaving it 1,205Wh short, or roughly a quarter of the night covered. It will keep phones, a laptop and a couple of lamps going for an evening. It also lists no UPS mode, so anything plugged into it stops the moment the grid does.
Should I buy the Explorer 500 or the Explorer 500 v2?
Check the chemistry before you check the price. The original runs traditional lithium-ion rated for 800 cycles to 80% capacity retention, while the v2 moved to LiFePO4 and a much higher cycle rating. At weekend duty the original is fine for years. As a daily-use battery, the newer chemistry is the one worth paying for.
What does the Ultra's UPS mode actually get me?
It sits between the wall and your gear and takes over when the grid drops. EcoFlow classifies that handover as no-break rather than publishing a measured switchover time, so treat it as a design claim rather than a stopwatch result. In practice it means a desktop that doesn't reboot, a router that doesn't blink and a CPAP that doesn't wake you, and owners running two batteries describe the changeover as flicker-free. The Explorer 500's spec sheet lists no UPS mode at all.
Which one is actually cheaper to own?
The Ultra, by about seven times per lifetime kilowatt-hour, because the arithmetic spreads its price across 3,500 rated cycles of 18,432Wh against the Explorer 500's 800 cycles of 518Wh. The catch is that the maths assumes you cycle it for years, so it only pays out for someone using it like an appliance. Warranty runs the same direction: our record has ten years on the Ultra against two on the Explorer 500, and where Jackery advertises a longer term it's three years plus two more that only exist if you register the unit.
Brand matchup
EcoFlow vs Jackery: measured across every matchup →Related comparisons
Where to buy
EcoFlow DELTA Pro Ultra + 2 Batteries
$7,999.00
$7,999.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
Jackery Explorer 500
$359.00
$359.00 · direct from Jackery
Last checked 13 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.