Head-to-head test
EcoFlow RIVER 3 MAX vs DJI Power 500
DJI is now the cheaper unit to buy and the cheaper one to run — $299 against $319, $.15 against $.19 per lifetime kWh — so the RIVER 3 MAX only wins this back if you're running something with a real compressor spike, where its rated 1,200W surge is headroom the Power 500 simply doesn't have on paper.
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
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EcoFlow
RIVER 3 MAX
2,472Power Score · Appliance Class
$319.00 list · direct from EcoFlow
DJI
Power 500
2,341Power Score · Appliance Class
$299.00 list · direct from DJI
Spec deltas
DJI's Power 500 costs $299 against the RIVER 3 MAX's $319, and it's cheaper to run over its full service life too: $.15 per kilowatt-hour delivered against $.19, the payoff of 4,000 rated cycles against 3,000. That's the case for DJI, and it's a real one.
The RIVER 3 MAX's real answer is surge headroom. Its 1,200W surge doubles its 600W continuous rating; the Power 500's 1,000W surge exactly equals its 1,000W continuous rating, nothing held in reserve on the spec sheet. One review found it briefly absorbed a 1,500W spike anywayB3 — worth knowing, but a single test result isn't a rating you can plan a fridge compressor around.
The RIVER 3 MAX also grows. It already starts ahead at 572Wh against the Power 500's 512Wh, and EcoFlow's expansion batteries let it add more; DJI has no such ecosystem, so 512Wh is the Power 500's ceiling for as long as you own it. Between the money DJI saves today and the headroom the RIVER 3 MAX banks for later, most buyers without a compressor or a growing power need should take the savings.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
That's one data point, not a rating. The RIVER 3 MAX's 1,200W is a number EcoFlow will stand behind if a fridge compressor spikes on startup; the Power 500's real ceiling above 1,000W is, per the available evidence, an anecdoteB3 rather than a spec.
DJI Power 500 rates 1,000W continuous with a 1,000W surge — identical to its continuous ratingRIVER 3 MAX rates 600W continuous with a 1,200W surge — double its continuous ratingOne review found the Power 500 briefly handled a 1,500W surge in testing, 500W above its own ratingB3
Why it mattersIf you're running anything with a real startup spike and want a margin you can plan around rather than hope for, that's the RIVER 3 MAX's rated 1,200W, not the Power 500's untested oneB3.
rated cycles
$.15 against $.19 per kWh over the full service life means DJI is cheaper to buy and cheaper to run — there's no lifetime-cost argument left for paying more upfront.
DJI Power 500 is rated for 4,000 cycles against the RIVER 3 MAX's 3,000At current prices, DJI's cost per lifetime kWh is $.15 against the RIVER 3 MAX's $.19
Why it mattersBuyers comparing total cost of ownership, not just the sticker price, should count this in DJI's column without reservation.
Capacity
Adding an expansion battery only widens a gap that already exists at the base unit. The Power 500 isn't just sealed — it's sealed at the smaller of the two starting numbers.
RIVER 3 MAX capacity is 572Wh; DJI Power 500 is fixed at 512WhRIVER 3 MAX is expandable via EcoFlow expansion batteries; the Power 500 has no expansion path
Why it mattersAnyone whose power needs might grow — a second device, a longer trip — should weigh the RIVER 3 MAX's room to expand now, while switching is still cheap; the Power 500 locks in 512Wh for good.
The Power 500's 25dBA against the RIVER 3 MAX's 30dBA is the difference two feet from your head all night. But if the same unit is also expected to catch a grid outage without waking you, the RIVER 3 MAX's under-10ms switchover beats the Power 500's under-20ms.
CPAP Overnight draw is 320Wh, using 66% of the RIVER 3 MAX's usable capacity and 74% of the Power 500'sPower 500 runs at 25dBA against the RIVER 3 MAX's 30dBARIVER 3 MAX switches over in under 10ms against the Power 500's under 20ms
Why it mattersBuying this purely as a CPAP battery, take the quieter Power 500; buying it to double as a UPS during outages too, the RIVER 3 MAX's faster switchover matters more than five decibels.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: Six gotchas fire here — surge ratio, expansion, cycle life, solar speed, UPS switchover, and warranty are where these two units actually differ.
rated cycles
Six real differences fire here, unusual for two units this close in price. The sharpest is surge: the RIVER 3 MAX's 1,200W surge doubles its 600W continuous rating, while the Power 500's 1,000W surge exactly equals its continuous rating — no cushion on the spec sheet. One review found the Power 500 briefly took a 1,500W spike anywayB3, but that's a single result, not a number you'd plan a compressor start around the way you can the RIVER 3 MAX's rated 1,200W.
The other four split two and two. DJI's 4,000 cycles against the RIVER 3 MAX's 3,000 is why its lifetime cost comes out lower ($.15 against $.19 per kWh); the RIVER 3 MAX answers with a faster UPS switchover (under 10ms against under 20ms) and the only expansion path between the two. Warranty is a wash at five years each, though the Power 500's lower price makes its cost per warranty year a few dollars cheaper: $60 against $64.
Your Life, Your Pick
Selected because: Five of six named use cases exceed both units' capacity; only CPAP Overnight fits either — grounds the verdict in what these are actually for.
Five of six scenarios exceed both units by a wide margin. Weekend Camping needs 432% of the RIVER 3 MAX's usable capacity and 483% of the Power 500's; an 8-Hour Blackout needs 338% and 378%. Remote Workday, Tailgate Party, and Van Life Daily land the same way — neither unit is sized for these, and no spec above changes that.
The one scenario both cover is CPAP Overnight, using 66% of the RIVER 3 MAX's usable capacity and 74% of the Power 500's. With neither straining, the real decision for someone sleeping next to it is the fan: 25dBA for the Power 500 against 30dBA for the RIVER 3 MAX. If the same unit also needs to catch an outage mid-therapy without a gap, the RIVER 3 MAX's faster switchover earns its keep back.
Lifetime Value
Selected because: Cost per lifetime kWh now favors DJI more meaningfully than it used to, since its price also dropped — worth surfacing honestly against the surge/expansion case for the RIVER 3 MAX.
cost / lifetime kWh
Run the numbers over a full service life and the Power 500 is the cheaper unit to own, not just to buy: $.15 per lifetime kWh against the RIVER 3 MAX's $.19, on the strength of 4,000 rated cycles against 3,000. That works out to 2,048 total kWh delivered for the Power 500 against 1,716 for the RIVER 3 MAX.
That closes one of the RIVER 3 MAX's arguments. Paying $20 more no longer buys a cheaper lifetime cost — it buys surge headroom and an expansion path, which are real, but they're different arguments than cost.
Growth Path
Selected because: Only the RIVER 3 MAX has a battery expansion ecosystem; the Power 500's 512Wh is a hard ceiling.
solar input
The RIVER 3 MAX starts 60Wh ahead of the Power 500 (572Wh against 512Wh) before expansion enters the picture at all. EcoFlow's expansion batteries let it grow further from there; DJI has no battery ecosystem for the Power 500, so 512Wh is the ceiling for as long as you own it.
That only matters if your needs might actually grow. If 512Wh already covers everything you plan to run, the Power 500 being sealed isn't a downside — it's just the complete unit, priced and rated for exactly what it is.
Brand Trust
Selected because: DJI is a genuine newcomer to power stations (about two years) against EcoFlow's established ecosystem — a real consideration for buyers weighing long-term support.
EcoFlow is the established name here: the largest lineup in portable power, the largest community in the category, and a multi-year track record across several product lines. DJI's power stations are about two years old, leaning on the support network the company built selling drones.
That's not disqualifying — DJI's engineering pedigree shows up as real advantages in this exact matchup: cycle life, solar input, and noise all favor the Power 500. But buying into DJI's power-station line today means a newer, thinner track record than EcoFlow's, with no expansion ecosystem yet if your needs grow.
Strengths & trade-offs
EcoFlow RIVER 3 MAX
Strengths
- +Lighter by 5.7 lb
- +Larger battery capacity
Trade-offs
- –Shorter-lived battery — rated for 3,000 charge cycles vs the Power 500's 4,000, so it wears out sooner.
DJI Power 500
Strengths
- +Costs $20 less
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Sealed capacity — the RIVER 3 MAX 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
A weekend campsite draws about 2,100Wh a day by this model's math — 432% of the RIVER 3 MAX's usable capacity and 483% of the Power 500's. Neither is close; this is a job for a much bigger battery, 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
An 8-hour blackout's typical draw, 1,645Wh, is 338% of the RIVER 3 MAX's usable capacity and 378% of the Power 500's. Both would need recharging mid-outage to finish a job neither is sized for.
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
A CPAP's overnight draw, 320Wh, uses 66% of the RIVER 3 MAX's usable capacity and 74% of the Power 500's — both handle it with room to spare. With neither straining, the tiebreak is the fan: the Power 500 runs 5dBA quieter, two feet from your head all night.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Neither unit
A remote workday's 910Wh draw runs past both units — 187% of the RIVER 3 MAX's usable capacity, 209% of the Power 500's. Either would need a midday top-up; neither is the standalone answer for a full day untethered.
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
A tailgate's 670Wh load is 138% of the RIVER 3 MAX's usable capacity and 154% of the Power 500's — both come up short before the game's over. Bring a way to top off, or size up.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
Van life's daily draw, 4,685Wh, is 964% of the RIVER 3 MAX's usable capacity and 1,077% of the Power 500's — both units are built for a weekend bag, not a rolling home. Neither belongs in this conversation.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the six scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: RIVER 3 MAX runs 2.4h vs 2.1h.
$319 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 0–32.4hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–6.5hHigh-Draw Appliances
These reveal the real limitsscale 0–0.4h¹ 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
July 26, 2026
Verdict: the Power 500
DJI's Power 500 costs $299 against the RIVER 3 MAX's $319, and it's cheaper to run over its full service life too, at $.15 per kWh delivered against $.19 — the payoff of 4,000 rated cycles against 3,000. It also charges faster from solar (300W against 110W) and runs quieter (25dBA against 30dBA). The RIVER 3 MAX's real answers aren't price: a rated 1,200W surge cushion the Power 500 doesn't have on paper (its 1,000W surge exactly matches its 1,000W continuous rating), and an expansion path past an already-larger 572Wh base, against the Power 500's fixed 512Wh. Take the Power 500 by default — the price and running-cost case is real. Take the RIVER 3 MAX instead if you're running a compressor-driven appliance and want a guaranteed surge margin, or if you want room to add capacity later.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 26, 2026. The links below open EcoFlow's and DJI's current prices.
$299.00 list · direct from DJI
or check the RIVER 3 MAX price$319.00 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated July 26, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): Solar Generator.
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, RIVER 3 MAX rates 4.7/5 (83rd percentile of 19 Compact-class units), and Power 500 rates 4.4/5 (67th percentile of 19 Compact-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
DJI's Panel Input Nearly Triples the RIVER 3 MAX's
300W against 110W is close to a 2.7x difference in solar input. The RIVER 3 MAX needs about 7.4 hours of strong sun to fully recharge from empty; the Power 500's much larger panel input covers the same job in a fraction of that.
RIVER 3 MAX Grows Past an Already-Larger Base
572Wh against 512Wh means the RIVER 3 MAX starts 60Wh ahead before expansion enters the picture. EcoFlow's expansion batteries let it grow further from there. The Power 500 has no such ecosystem — 512Wh is the ceiling for as long as you own it.
Surge Power: Rated Headroom vs a Hard Ceiling
The RIVER 3 MAX's 1,200W surge doubles its 600W continuous rating — real, rated cushion. The Power 500's 1,000W surge exactly matches its 1,000W continuous rating: nothing held in reserve on the spec sheet, at all.
UPS Speed: Line-Interactive Beats Standby
The RIVER 3 MAX switches over in under 10ms; the Power 500 takes up to 20ms — twice as long. Most electronics won't notice either way, but a desktop or networking gear mid-task is safer on the faster switch.
Same Warranty Length, Different Cost
Both carry a 5-year warranty. The Power 500 costs $60 per warranty-year against the RIVER 3 MAX's $64 — a function of its lower price, not a better warranty term.
Cycle Life: The Real Source of DJI's Lifetime-Cost Edge
4,000 cycles against 3,000 is a genuine edge for the Power 500, and it's the reason its lifetime cost per kWh comes out lower despite starting only $20 cheaper.
Full record above — the Test Desk pick is the Power 500.
Check Power 500 price →or check the RIVER 3 MAX 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 wins on both sticker price and long-term value. At $0.15/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Brand trust
EcoFlow
Ecosystem
EcoFlow's lineup spans the DELTA Pro, DELTA 3, and RIVER 3 series plus solar panels and smart home panels — a real upgrade path if your needs grow.
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
The largest community in the category, useful for troubleshooting or comparing notes with another owner.
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
Support experience is polarized — plenty of hassle-free replacements, but also complaints of long waits. Buying through a major retailer gives you a stronger fallback.
DJI
Ecosystem
Four models total, and no expansion-battery ecosystem yet — DJI is still building this out.
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
No dedicated power station community yet. Discussions happen within r/dji (~250K members, mostly drone users). Very small power-specific presence on Facebook and forums.
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 from the drone business show up as real engineering: the quietest operation in the category, the fastest wall-charging, and a cycle-life edge over the RIVER 3 MAX.
Worth knowing
About two years of track record in power stations is thin next to EcoFlow's, and there's no built-in solar charge controller — it needs a separate proprietary adapter.
Analyst note
EcoFlow is the safer long-term bet on ecosystem, community, and track record. DJI's engineering is arguably sharper on paper, and it's now the cheaper unit too — but it's a newer bet in a category EcoFlow has been building for years.
Growth path
RIVER 3 MAX
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 572Wh.
Accepts up to 110W of solar. Limited to a single portable panel.
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 RIVER 3 MAX starts at 572Wh 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 RIVER 3 MAX
Reviewers describe the RIVER 3 line as engineered for buyers who don't need to power a whole house — genuinely portable, not a scaled-down DELTAA4. It's built on the platform reviewers praise for sub-30dB operation and IP54 ruggednessA2, with cells rated past 3,000 cycles to 80% — roughly a decade of everyday useA3. Coverage of the RIVER 3 MAX specifically is thinner than the platform-level detail; one source describes the top of the line reaching 858Wh with expansion, though model-specific detail there is flagged as uncertainA1.
“Offers up to 858Wh of LFP battery storage — the largest capacity in the RIVER 3 line — as a compact, portable unit.”
Sources
powerstationadvisor.com · ecoflow.com · backuppowerhub.com · amazon.com · portablepowernerd.com
DJI Power 500
Reviewers confirm the Power 500's 512Wh pack and 1,000W output, with cells rated for roughly a 10-year lifespan at their tested cycle countB1. In testing it ran a 905W load and briefly handled a spike above its own rating, and reviewers found it more efficient than DJI's own larger Power 1000B3. At around 16 lbs it's still easy to carryB2, though one review flags that it ships with only a wall plug — no solar adapter or car-charging cable includedB4.
“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
- Largest RIVER 3 capacity (up to 858Wh), quiet IP54 build, and 3,000-cycle LFP are the standout points. [RIVER 3 MAX · 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
“Offers up to 858Wh of LFP battery storage — the largest capacity in the RIVER 3 line — as a compact, portable unit.”
powerstationadvisor.com / ecoflow.com — RIVER 3 line review · 2026 · [positive]
- A2
“Built on the same RIVER 3 platform reviewers praise for sub-30dB whisper-quiet operation and IP54 ruggedness.”
backuppowerhub.com — RIVER 3 review · 2026 · [positive]
- A3
“LiFePO4 chemistry rated for 3,000+ cycles to 80% — roughly a decade of everyday use.”
backuppowerhub.com / amazon.com — RIVER 3 line · 2026 · [positive]
- A4
“Reviewers value the RIVER 3 family for quality engineering and genuine portability for those who don't need to power a whole house.”
portablepowernerd.com — RIVER 3 review · 2026 · [positive]
- 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 July 26, 2026.
Who Should Buy Which
Buy the RIVER 3 MAX if you…
- →You're running anything with a real compressor spike — a mini-fridge, a window AC, a space heater cycling on — and want a rated surge cushion: 1,200W against a 600W continuous number, more absolute headroom than the Power 500 can ever deliver.
- →You want room to grow. The RIVER 3 MAX already starts ahead at 572Wh and adds more through EcoFlow's expansion batteries; the Power 500 can't.
- →You need the faster switchover — under 10ms against under 20ms — for something like a desktop or router that can't tolerate a blip.
Buy the Power 500 if you…
- →You want the lower price and the lower cost per kWh over its life: $299 up front and $.15 per kWh delivered, against the RIVER 3 MAX's $319 and $.19.
- →You need continuous output the RIVER 3 MAX's 600W ceiling can't touch — up to the Power 500's full 1,000W — and you're charging by sun, where its 300W panel input is nearly triple the RIVER 3 MAX's 110W.
- →You want the quieter unit for something like a CPAP: 25dBA against 30dBA, and you don't need the RIVER 3 MAX's faster switchover for a second job as a UPS.
If neither fits
If you actually need to survive an 8-hour blackout or run a full weekend campsite, skip both. That blackout's typical draw is 338% of the RIVER 3 MAX's usable capacity and 378% of the Power 500's; a weekend camping load is worse, at 432% and 483%. Look at a unit with several times the capacity of either of these instead.
The Bottom Line
DJI's Power 500 is the cheaper unit to buy and the cheaper one to run: $299 against $319 up front, $.15 against $.19 per lifetime kWh. That's a real, current edge, not a wash. The RIVER 3 MAX's answer isn't price — it's a rated 1,200W surge cushion the Power 500 doesn't have on paper, and a path to more capacity the Power 500 doesn't have at all.
Take the Power 500 by default; the savings are real and they compound. Take the RIVER 3 MAX instead if you're running something with a genuine compressor spike or you want room to grow later — those are the two arguments a lower price doesn't answer.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Which is cheaper, the RIVER 3 MAX or DJI Power 500?
The Power 500, at $299 against the RIVER 3 MAX's $319 — a $20 difference. It's also cheaper to run over its full service life: $.15 per kWh delivered against $.19.
Which has better surge protection for a fridge or compressor?
The RIVER 3 MAX on paper: its 1,200W surge doubles its 600W continuous rating, real headroom above what it's rated to run continuously. The Power 500's 1,000W surge exactly matches its 1,000W continuous rating, with nothing held in reserve — though one review found it briefly handled a 1,500W spike in testing, a single result rather than a rated spec.
Does the DJI Power 500 expand like the RIVER 3 MAX?
No. The Power 500 has no expansion-battery ecosystem and is fixed at 512Wh for as long as you own it. The RIVER 3 MAX starts ahead at 572Wh and adds more capacity through EcoFlow's expansion batteries.
Which one lasts longer, and is that worth paying for?
The Power 500 is rated for 4,000 cycles against the RIVER 3 MAX's 3,000, which is why its lifetime cost comes out lower: $.15 per kWh against $.19. At current prices it's not a trade-off — the Power 500 is both the cheaper unit today and the cheaper one to run over time.
Which one is quieter, and does it matter for a CPAP?
The Power 500, at 25dBA against the RIVER 3 MAX's 30dBA. Both easily cover a CPAP's overnight draw with room to spare, so for that use alone, the five-decibel gap is the real difference, not capacity.
Where to buy
EcoFlow RIVER 3 MAX
$319.00
$319.00 list · direct from EcoFlow
DJI Power 500Pick
$299.00
$299.00 list · direct from DJI
Prices may vary by retailer and are subject to change.