Head-to-head test
EcoFlow DELTA Pro Ultra + 1 Battery vs DJI Power 500
One of these covers every load on this page and can never leave the room it's installed in; the other goes anywhere and covers exactly one.
Full profiles: EcoFlow DELTA Pro Ultra + 1 Battery → · DJI Power 500 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
One of these you install. The other you pick up with one hand at 16.1 lb and put on the back seat. They're both filed as power stations, and that is roughly where the overlap ends.
Of the six load profiles this page runs, the DJI Power 500 finishes exactly one: the 320Wh CPAP night, which it ends with 115Wh of its 435Wh usable still in hand. The DELTA Pro Ultra + 1 Battery has the energy for all six and still loses two of them, because the rows that require showing up somewhere score 'neither' when the unit weighs what eighteen Power 500s weigh.
So the verdict is the Ultra, and it isn't close on anything this page measures except the two things most readers care about most: what it costs, and whether you can lift it. If you haven't already decided you're backing a building, that's the sentence to read twice.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
The two rows the Ultra drops, Weekend Camping and Tailgate Party, don't go to the Power 500. They come back 'neither'. The small unit doesn't win them; it gets 21% and 65% of the way through and stops. One of these can't come, and the other can't finish, which is a different and more useful finding than either unit simply being better.
Power 500: 512Wh nameplate, 435Wh usable once the flat 85% derate is appliedThe six load profiles on this page range from 320Wh to 4,685WhDELTA Pro Ultra + 1 Battery: 10,445Wh usable, and the record marks it stationary
Why it mattersIf you need power that both travels and lasts, the honest answer is that it isn't on this page, and you should be shopping the mid-size portables instead.
solar input
The difference is what it takes to reach those figures. The Ultra's 5,600W is the box you already bought. The Power 500's 300W is a number you have to go buy hardware to reach, and one review notes it ships with a wall plug and nothing else, no solar adapter and no car cableB4. In a multi-day outage that's the gap between recharging and shopping.
DELTA Pro Ultra + 1 Battery: 12,288Wh of capacity against 5,600W of solar inputPower 500: 512Wh against 300W of solar inputDJI's stations carry no built-in solar charge controller, so solar runs through a separate proprietary adapter
Why it mattersBudget the adapter into the Power 500 before you compare it to anything on solar input, because the catalogue figure is not what's in the carton.
Those are sockets for well pumps, dryer circuits and trailer plugs, loads a 1,000W inverter has no path to whether or not it has an outlet shaped for them. The price gap is not buying a better version of what the DJI does; it is buying a different panel for a different class of load.
Both records carry 2 USB-A and 2 USB-C ports, and both cap USB-C at 100WThe Ultra records three AC sockets, two 240V outlets and one 30A RV outletThe Power 500 records two AC sockets and an affirmative zero on both 240V and 30A RV
Why it mattersIf the biggest thing you'll ever plug in has a standard wall plug on it, you're looking at $5,700 of outlets you will never use.
Three cents a kilowatt-hour is not a reason to spend $5,700, and it is not a reason to avoid it either. When cost per kilowatt-hour and years of service both come out level, the only variable left is how much energy you need in one place at one time, which is a question about your load list rather than about either unit.
Both packs are rated for a 4,000-cycle minimumCost per lifetime kilowatt-hour: 12 cents for the Ultra, 15 cents for the Power 500At a cycle a day the engine puts both at 11 years of service
Why it mattersIgnore the per-kilowatt-hour framing entirely on this matchup and size on the load list, because the metric that usually decides these pages is a dead heat here.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Six load profiles, and the only one both units finish is the one where the load is 40 watts.
The only row on this grid that both units finish is the one where the load is 40 watts. A CPAP draws about that for eight hours, 320Wh in total, and the Power 500 ends the night with 115Wh of its 435Wh usable still in hand. Every other profile is over its head. Against the 1,645Wh an eight-hour blackout needs it falls 1,210Wh short, and against a 4,685Wh day of van life it covers 9%.
The two rows the Ultra doesn't win are the interesting ones, because it doesn't lose them either. Weekend Camping and Tailgate Party both come back 'neither': the Ultra has the energy and no way to attend, and the Power 500 shows up and covers about two thirds of a 670Wh afternoon before it quits. That pairing is the whole page in miniature.
Portability & Form Factor
Selected because: 293.6 lb against 16.1 lb decides more of this matchup than the price does.
weight
293.6 lb is not a number you lift, it's a location you choose. EcoFlow ships it across more than one box, so no single piece is the crisis, but the assembled thing is furniture. You pick the corner of the garage or the utility room once, and then it lives there, which is the product working as designed rather than a compromise you're making.
The Power 500 is the opposite proposition and honest about it. 16.1 lb goes in the back seat with a hand free for the cooler, which is why it wins nothing on this page except the night it spends beside a bed. Weight is the one spec the price gap can't touch: $5,700 buys energy, not a handle.
Lifetime Value
Selected because: Both packs carry the same 4,000-cycle minimum, so cost per lifetime kilowatt-hour lands at 12 cents against 15 and settles nothing.
cost / lifetime kWh
Twelve cents a kilowatt-hour against fifteen, and it runs the direction nobody expects. The expensive box is the cheaper one per unit of energy it will ever deliver, because both packs carry the same 4,000-cycle minimum and one of them moves 24 times as much energy per cycle, 12,288Wh against 512Wh.
It is also a difference small enough to ignore, which is the useful part. Matching cycle ratings put both units at eleven years of service at a cycle a day, so neither is the one that wears out first. Buy the capacity your load list demands and let the per-kilowatt-hour figure stay where it belongs, in a footnote.
What the Specs Don't Tell You
Selected because: Two cards matter here: the Ultra's mass, and the fact that the Power 500's record publishes no surge figure at all.
The most useful card here is the one that looks like a mark against the Power 500 and isn't. Its record publishes no surge figure above the 1,000W it makes continuously, which is why the ratio reads 1x, and a missing number is not a measured zero. One review ran it at 905W and watched a brief 1,500W spike ride through past the ratingB3. Plan its motor loads at 1,000W because that is what's documented, not because the unit has been shown to trip there.
The Ultra's 10,800W peak against 7,200W continuous is genuine headroom and the far higher ceiling, though neither unit clears the 2x margin usually quoted for motor startups, so read both as published ceilings rather than two grades of inverter. The card that should actually move you is the weight one.
Brand Trust
Selected because: EcoFlow has the deepest catalogue in the category and a support record that splits; DJI has been selling power stations since 2024.
EcoFlow has been at this longer than almost anyone on the shelf and it shows in the catalogue: a dozen-plus models, its own panels, smart home panels, and a subreddit of about 31,000 people where someone has already had your problem. DJI has been selling power stations since 2024. Its support network is inherited from the drone business and is genuinely capable, but there is no power-station community to search at 11 p.m.; the quarter-million people in r/dji are mostly there to fly things.
The line in EcoFlow's file that deserves a second read is that it offers no parts and no service once the warranty term is up. Five years is the same cover the Power 500 advertises and it is also the entire repair plan, which reads differently on a unit you bolt into a utility room than on one that lives in a closet.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra + 1 Battery
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$5,700) than the Power 500.
- –Significantly heavier (+277.5 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
DJI Power 500
Strengths
- +Costs $5,700 less
- +Lighter by 277.5 lb
Trade-offs
- –Weaker inverter (-6,200W) limits appliance compatibility.
- –Sealed capacity — the DELTA Pro Ultra + 1 Battery can add batteries to grow past 512Wh; this one can't.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
SCN-01 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Neither, for opposite reasons. A powered weekend asks 2,100Wh; the Power 500 brings 435Wh usable and runs out 1,665Wh short, somewhere around Saturday's coffee. The Ultra has roughly five of those weekends sitting in it at 10,445Wh usable and no way to reach the site. If the campsite is the use case, the right answer is a mid-size portable and neither of these.
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 + 1 Battery
The Power 500 doesn't finish — 435Wh usable against the 1,645Wh this needs leaves it 1,210Wh short, about 26% of the scenario covered. The DELTA Pro Ultra + 1 Battery covers it with 8,800Wh to spare.
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
Either unit
This row goes to the Power 500, and it takes it on fit rather than capacity. A CPAP is about 40W for eight hours, 320Wh, which the small unit finishes with 115Wh spare and the Ultra finishes without noticing, leaving 10,125Wh untouched. Bringing a sited multi-box platform to a bedside job isn't a win, it's a category error. On the question people actually ask here, whether the fan wakes you, each maker publishes its own rating and they don't measure the same way, so neither figure describes a 40W draw at 2 a.m. Treat that as a reason to hear one in person before either box sleeps next to you.
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 + 1 Battery
The Power 500 doesn't finish — 435Wh usable against the 910Wh this needs leaves it 475Wh short, about 48% of the scenario covered. The DELTA Pro Ultra + 1 Battery covers it with 9,535Wh 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
Nobody wins the parking lot. The Power 500 is the only one of the two that can get there, and it covers about two thirds of a 670Wh afternoon before it quits, 235Wh short. The Ultra has the energy sitting at home where it lives. What a tailgate wants is a unit with a handle and about half again the Power 500's usable 435Wh, which describes neither of these.
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 + 1 Battery
The Ultra takes this one on the only axis that counts at 4,685Wh a day: it's the one that finishes, with 5,760Wh still in reserve, while the Power 500 covers 9% of the day. Say the honest part out loud, though. This is a build-it-in decision rather than a throw-it-in-the-back one, and the van gets designed around the unit rather than the other way round. If your rig can't carry and mount it, the question changes from which of these to not either of these.
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 + 1 Battery runs 51h vs 2.1h.
$5,999 list · direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sized →
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 0–696.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–139.3hHigh-Draw Appliances
These reveal the real limitsscale 0–10.4h¹ 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 19, 2026
Verdict: the DELTA Pro Ultra + 1 Battery, on Power Score margin
The DELTA Pro Ultra + 1 Battery wins on every axis this page measures except warranty, where the two match at 5 years. It has the energy for all six load profiles here; the Power 500 finishes one of them. It takes more solar, starts bigger loads, and it is even the cheaper of the two per lifetime kilowatt-hour. The confidence sits at six rather than nine for one reason, and it isn't a spec: these are not substitutes. 12,288Wh across a multi-box platform you install is a different purchase from 512Wh you carry with one hand, and a reader who is genuinely torn between them hasn't settled what job they're buying for. Decide that first. If the answer is a house, the Ultra is not a close call; if the answer is a campsite or a weekend away, neither of these is your unit and the who-should-buy section below says so plainly.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open EcoFlow's and DJI's current prices.
$6,199.00 · direct from EcoFlow
Last checked 28 days ago. Prices move — check before you buy.
or check the Power 500 price$299.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 26 days out
Prices to beat:DELTA Pro Ultra + 1 Battery $5,814Power 500 $299
The lowest we have recorded for each. We have never seen the Power 500 discounted, so any real cut on it would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, Home Backup, CPAP, Solar Generator, Tailgating, 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 + 1 Battery rates 3.7/5 (22nd percentile of 37 Whole-Home / Off-Grid-class units), and Power 500 rates 4.6/5 (74th 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.
The Ultra Is Furniture, Not Luggage
EcoFlow ships this across more than one box, so no single piece is the crisis, but the assembled thing does not get carried anywhere. Choose its spot the way you'd choose a spot for a water heater: near the panel, off a damp floor, somewhere you can still reach the back of it. You get one good decision here, and then it's made.
Power 500: 512Wh Is the Whole Product
Sealed capacity isn't a flaw in a unit this size, it's the shape of what you're buying, and 512Wh either covers your list or it doesn't. The part worth knowing is what happens if you outgrow it. DJI sells expansion on the Power 2000 and the Power 1000 V2 but not on this one, so growing inside DJI's line means buying a different model rather than adding a battery to this one. The Ultra's expansion is a separate conversation, and one you only reach after its own 12,288Wh runs out.
One of These Publishes a Surge Figure
The Ultra lists 10,800W of peak against 7,200W continuous, real headroom and by far the higher ceiling, though short of the 2x margin usually quoted for motor startups. The Power 500's record carries no surge figure above its 1,000W continuous rating, which is why its ratio reads 1x. Read that as a documentation gap rather than a measured ceiling: nothing here says the unit trips at 1,000W, only that no figure above it has been published. Plan its motor loads at 1,000W because that is what's on the record.
UPS Switchover: 0ms-rated vs ≤20ms
Both list a UPS mode, at different rated speeds. The DELTA Pro Ultra + 1 Battery is rated 0ms — a no-break design on paper, which is the maker's classification rather than a stopwatch result. The Power 500 is rated ≤20ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Five Years Against Up to Five
The Ultra carries five years. The Power 500 carries up to five, and the 'up to' is load-bearing, because the full term is the one advertised through DJI's own store, so where you buy changes what you're covered for. The quieter line sits on EcoFlow's side: it offers no parts and no service once the term is up, which on a unit you install permanently makes the warranty the whole of the repair plan rather than the first chapter of it. Worth knowing before you build it into a wall.
Full record above — the Test Desk pick is the DELTA Pro Ultra + 1 Battery.
Check DELTA Pro Ultra + 1 Battery price →or check the Power 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 Power 500 is cheaper to buy, but the DELTA Pro Ultra + 1 Battery is cheaper to own. At $0.12/kWh over its lifetime vs $0.15/kWh, the DELTA Pro Ultra + 1 Battery's higher cycle life and capacity make each dollar go further over the years. One thing to know reading the table: both carry the same 4,000-cycle rating, so the lifetime rows are sticker price and capacity in disguise — the wear horizon is identical and decides nothing here.
Brand trust
EcoFlow
Ecosystem
The deepest catalogue in the category: a dozen-plus models across the DELTA Pro, DELTA 3 and RIVER 3 lines, plus EcoFlow's own panels and smart home panels. The DELTA Pro Ultra sits at the top of it as a stacking platform for whole-home backup, which is a flagship path rather than something the rest of the range does.
Support
US phone, email and chat, with a record that splits hard. Prepaid-label replacements that go through cleanly on one side; long waits and refurbished units sent against new claims on the other. Buying through Costco or Amazon gives you a return window that doesn't depend on which side you land on.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
Worth knowing
EcoFlow offers no parts and no service once the warranty term ends, which lands differently on a unit you install permanently than on one that lives in a closet. It also tested subscription paywalls for advanced app features in early 2025 and paused the plan after community pushback.
DJI
Ecosystem
Five power station models since 2024, and the lineup has already forked: the original Power 1000 is still sold alongside its V2 replacement. If you shop DJI past this page, check which revision a listing actually ships.
Support
Leveraging DJI's established global support and repair center network from the drone business. Generally positive reputation inherited from drone operations, but limited power-station-specific track record.
Community
There isn't a power-station community yet. Discussion happens inside r/dji, a quarter of a million people who are mostly there for drones, and that matters at the moment you hit an odd fault at 11 p.m. and want to know whether anyone else has seen it.
App experience
Rated 3.5/5 iOS and Android (DJI Home app ratings reflect entire DJI ecosystem including drones/cameras, not power-station-specific). Users report the on-device screen is more reliable than the app.
Unique strength
700-plus battery patents out of the drone business, premium build quality, and SDC ports that charge DJI drone batteries fast. That last one is a genuine advantage and a narrow one, since it pays off only if you already own the gear.
Worth knowing
DJI stations carry no built-in solar charge controller, so solar runs through a separate proprietary adapter you buy separately. Expansion exists on the Power 2000 and Power 1000 V2, but not on the Power 500.
Analyst note
A mature category leader against a hardware company two years into the category, and the brand column is still not what should decide this page. One of these is a 12,288Wh platform you install and the other is a 512Wh unit you carry, and no amount of ecosystem depth or drone-business pedigree changes which of those two things your house actually needs.
Growth path
DELTA Pro Ultra + 1 Battery
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
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.
Power 500
FIXED CAPACITYFixed at 512Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 300W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
The Power 500 is sealed at 512Wh, which is fine if that covers you. The DELTA Pro Ultra + 1 Battery starts at 12,288Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the Power 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 + 1 Battery
Field data on this exact configuration is thin, and our own research says so before anyone else has toA0: the richest source is a single detailed DIY Solar Forum thread from February 2024, with nothing at all on the '+1 Battery' pairing, cold-weather behavior, long-term durability or UPS switchoverA0. What that one owner found is not flatteringA4. They landed on 'kind of meh' and said they were unlikely to expand it or integrate it into the houseA4, found no real manual beyond a thin web guideA5, watched the app read 90% and then fall to 8% across a few daysA9 with no state-of-charge graph to check it againstA8, and measured RF interference on common ham frequencies that vanished the moment the unit was switched offA6. EcoFlow's support suggested a faraday cageA7.
Fan noise is the one subject several entries touch, and it is the least trustworthy material in the file. The blog those notes come from was comparing the DELTA Pro Ultra against EG4 inverters, and our researcher could not confirm which box two of the readings actually describeA2A3, so the 'fans always run' complaintA1 is character rather than a spec claim. Read the whole picture as one account rather than a patternA0. A single thread is not a sample, and the absence of a second one is the honest headline here.
“When the fans are not on, the inverter emits zero noise...even when I put my ear against the case.”
Sources
windinmyface.com · diysolarforum.com
DJI Power 500
What exists for the Power 500 comes from review desks rather than long-term ownersB0, and they like it. The pack is automotive-grade LFP behind a 1,000W outputB1, light enough that the weight is the first thing said about itB2, and in testing it held a 905W load, took a brief 1,500W spike past its rating, and beat the larger DJI Power 1000 on efficiencyB3. The one complaint is about the carton: a wall plug and nothing else, no solar adapter, no car cableB4.
The gap on this side is time rather than sentiment. DJI only entered the category in 2024, so nothing in the file tells you how one of these looks after three winters, and the positive read above is a set of first impressions rather than a service recordB0.
“A 512Wh LFP battery with up to 1,000W output; the automotive-grade LFP cells are rated up to 3,000-4,000 cycles for roughly a 10-year lifespan.”
Sources
dji.com · thesolarlab.com · techradar.com · views-sounds.com · t3.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
- SoC/battery metering appears unreliable, with reported percentage dropping much faster than expected after resuming charge cycles [DELTA Pro Ultra + 1 Battery · 2 entries]
- Support interactions were unhelpful or dismissive when owners raised specific technical issues (manual gaps, RFI, missing SoC graph) [DELTA Pro Ultra + 1 Battery · 3 entries]
- Fan behavior/noise is a recurring point of owner scrutiny, though direct DPU-specific noise data is thin and partly inferred from sibling EG4 units [DELTA Pro Ultra + 1 Battery · 3 entries]
- Light, efficient LFP unit with strong real-world output and drone-pilot appeal; the caveat is minimal included accessories. [Power 500 · 3 entries]
- A1
“Yuck—fans always run even on the expensive high end Delta Pro Ultra?”
windinmyface.com blog — 'Fan Noise with Solar Power / Solar Generators (Anker, Ecoflow, EG4)' (comment thread) · 2024-12 · [negative]
- A2
“When the fans are not on, the inverter emits zero noise...even when I put my ear against the case.”
windinmyface.com blog — 'Fan Noise with Solar Power / Solar Generators (Anker, Ecoflow, EG4)' (owner test notes, related EG4 12kPV/18kPV comparison to DPU) · 2024-12 · [positive]
- A3
“At 6.3kW of load, the fan turned on... The fans turned off when I reached about 4.5kW. This is probably the expected hysteresis behavior.”
windinmyface.com blog — 'Fan Noise with Solar Power / Solar Generators (Anker, Ecoflow, EG4)' (thermal/fan behavior test, note: performed on EG4 18kPV, referenced as comparison point to DPU) · 2024-12 · [mixed]
- A4
“Pulled the trigger on an EcoFlow Delta Pro Ultra (DPU) and I'm kind of meh on it and unlikely to expand or integrate it into the house.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A5
“No real manual. All they have is the web user guide which is superficial if I'm being generous.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A6
“Even when the inverter is not running, it interferes with common frequencies like 146.520MHz... Turn off the DPU, emission goes away.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A7
“I contacted EcoFlow support and they told me I could put it in a "faraday cage".”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A8
“No State of Charge graph in the app. Figured if they were showing charts of Input and Output over time, they must have a SoC chart. Nope.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A9
“After a few days of using it overnight and letting it charge back up to "90%", it'd go from "90%" down to "8%".”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- B1
“A 512Wh LFP battery with up to 1,000W output; the automotive-grade LFP cells are rated up to 3,000-4,000 cycles for roughly a 10-year lifespan.”
dji.com / thesolarlab.com — Power 500 review · 2026 · [positive]
- B2
“Weighs only about 7.3 kg, making it easy to transport.”
dji.com / techradar.com — Power 500 review · 2026 · [positive]
- B3
“In testing it ran a 905W load and briefly handled a 1,500W surge above its 1,000W rating; reviewers found it outperformed the larger DJI Power 1000 in efficiency testing.”
thesolarlab.com / views-sounds.com — Power 500 review · 2026 · [positive]
- B4
“Reviews are positive overall, though one noted it ships with only a wall plug — no solar adapters or car-charging cables included.”
t3.com / techradar.com — Power 500 review · 2026 · [mixed]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra + 1 Battery if you…
- →You've decided to back the building rather than the trip. The Ultra carries three AC sockets, two 240V outlets and a 30A RV outlet, and the Power 500 records an affirmative zero on the last two.
- →You lose power for days rather than hours. 10,445Wh usable plus 5,600W of solar input means you ride out the outage and refill inside a single good solar day, which is the half of outage planning most people skip.
- →You have a permanent spot for it and no intention of moving it again. That isn't a compromise on this unit, it's the specification.
Buy the Power 500 if you…
- →Everything on your list has a standard wall plug and a modest appetite: laptop, phone, camera batteries, a CPAP. 435Wh usable finishes the 320Wh night with room to spare.
- →You already fly DJI gear. The SDC ports charge drone batteries fast, which is a real advantage if you own the drones and no advantage whatsoever if you don't.
- →You want something you can carry in one hand and set on a picnic table. 16.1 lb is the entire argument and it's a good one.
If neither fits
Most people who land on this page, honestly. If you're weighing a sited multi-box platform against a unit you carry with one hand, the thing you haven't settled is the job, not the hardware. The grid above hands two of its six rows to 'neither' for exactly that reason: a weekend campsite and a tailgate both want power that travels and lasts, and one of these can't travel while the other can't last. Go look at the mid-size portables instead, the ones that still have a handle but hold several times the Power 500's 512Wh. That's the shape of unit that finishes a weekend, and it costs a fraction of what the Ultra does while doing a job the Ultra can't.
The Bottom Line
Take the DELTA Pro Ultra + 1 Battery, with the caveat that taking it means installing it. It has the energy for every load profile on this page, refills from the sun in roughly the window the Power 500 needs for its own much smaller tank, and costs less per lifetime kilowatt-hour than the cheap one does. None of that helps if what you need is power that travels.
And if you're on this page because you genuinely can't choose between them, the useful answer is that you're undecided about the job rather than the hardware. Settle that and the page answers itself. One of these boxes is a building; the other is a bag.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro Ultra + 1 Battery overkill compared to a DJI Power 500?
For most buyers, yes, and that's the right frame for the question. The Ultra holds 12,288Wh and weighs 293.6 lb; it exists to back a house, not to be a bigger portable. The Power 500's 512Wh is a phone, laptop and CPAP unit and it's honest about that. The real question isn't which is better, it's whether you're powering a building or a table.
Can the DJI Power 500 run a fridge through an 8-hour blackout?
Not the whole outage. This page's blackout profile needs 1,645Wh and the Power 500 has 435Wh usable after the standard 85% derate, so it covers about a quarter of the night and comes up 1,210Wh short. It will keep a router, a couple of phones and some lights alive, which is a real job worth doing. It will not carry a fridge to morning.
Does the DJI Power 500 have a surge rating?
Our record carries none above its 1,000W continuous output, which is a gap in what DJI publishes rather than evidence of no headroom. One review ran a 905W load on it and saw a brief 1,500W spike ride through. Size your motor loads against the documented 1,000W and treat anything above that as untested rather than as a known limit.
How much solar can each one take?
5,600W on the DELTA Pro Ultra + 1 Battery against 300W on the Power 500. That sounds lopsided until you divide by capacity: 12,288Wh at 5,600W is about two hours of full-rate sun and 512Wh at 300W is about an hour and a half, so the refill windows are similar. The catch sits on DJI's side, where solar runs through a separate proprietary adapter rather than a built-in controller, and the Power 500 ships with a wall plug and little else.
Which one is cheaper to own over its lifetime?
The Ultra, at 12 cents per lifetime kilowatt-hour against 15, because both packs are rated for a 4,000-cycle minimum and one delivers 24 times the energy per cycle. Three cents is not a reason to choose anything. Decide on how much energy you need in one place at one time, then check that you can live with what that costs up front.
Brand matchup
EcoFlow vs DJI: measured across every matchup →Related comparisons
Where to buy
EcoFlow DELTA Pro Ultra + 1 BatteryPick
$6,199.00
$6,199.00 · direct from EcoFlow
Last checked 28 days ago. Prices move — check before you buy.
DJI Power 500
$299.00
$299.00 · direct from DJI
Last checked 28 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.