Power stationsSections
EcoFlow RIVER 2 Max 500
- AC delivered · est.
435 Wh. Show source
estimated sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- output
500 W. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- surge
1,000 W. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- weight
6.1 kg. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf
Limited
#6 of 9
in the Compact class · small class (n=9)
Lifted by Durability & longevity and Charging & solar; held back by capacity & expansion.
Check current availability and pricing at the retailer.
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At a glance
We review EcoFlow RIVER 2 Max 500 as a compact model. Use output, delivered capacity and startup limits to check your appliances. It supplies 500 W of continuous AC output. BatteryRank scores it 48 out of 100 within its size class.
EcoFlow RIVER 2 Max 500 specs at a glance
Find the reading you need, then follow its source in the full specifications below.
- How much does the EcoFlow RIVER 2 Max 500 weigh?
6.1 kg (13.4 lb), manufacturer-claimed, without accessories.
Source and date. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- What are the dimensions of the EcoFlow RIVER 2 Max 500?
269 × 259 × 196 mm (10.6 × 10.2 × 7.7 in), length × width × height, manufacturer-claimed.
Source and date. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- How many watts can the EcoFlow RIVER 2 Max 500 output?
500 W continuous AC output and 1,000 W surge output, manufacturer-claimed. Appliance startup demand must stay within the relevant limit.
Source and date. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- How much solar input can the EcoFlow RIVER 2 Max 500 accept?
220 W maximum solar input, manufacturer-claimed. Actual harvest depends on panel compatibility, sun, orientation, temperature, and conversion losses.
Source and date. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf
Capacity truth
The watt-hour number on the box isn't what reaches your devices. Rated on the label vs what actually leaves an outlet.
512 Wh. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdfThe marketing number — total cell capacity.
435 Wh. Show source
estimated sourceestimate = battery-side usable capacity × 85% inverter efficiencyWhat reaches an AC outlet — about 15% is lost turning battery power into household AC. How we estimate.
What it can run
Same sourced device assumptions used by our calculators, applied to this model's usable AC energy. Actual runtime varies with load, temperature, and standby draw.
| Device | Estimated runtime | Sourced assumption |
|---|---|---|
| CPAP (humidifier off) | about 6.0 nights | 9 W · |
| CPAP (heated humidifier on) | about 1.0 nights | 56 W · |
| Refrigerator (full-size) | about 6.9 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 24 hours | 18 W · |
| Laptop (65W charger) | about 13 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 21 full charges | 20 W · |
Who it fits
Mechanical matches against this model's own sourced specs — never invented sentiment, never a guess on a spec we don't have.
6.1 kg with 220 W solar input → carry-in, solar-rechargeable
How it scores
Four buyer pillars over seven sub-scores — computed from sourced data with a published formula, price-independent by design.
Power
est.Battery-side usable capacity and how much you can run at once.
Usable watt-hours and how far you can grow it with add-on batteries, versus its size class.
Continuous and surge wattage, outlet count, and USB-C fast-charging.
Trust
42% dataOwner reputation, safety record, warranty, and build durability.
Owner ratings, brand reputation, recall record, and warranty backing.
Rated cycle life, warranty length, cell chemistry, and weather sealing.
Charging
est.Wall and solar recharge speed.
Wall recharge speed, solar input, and multi-source charging.
Livability
62% dataLightweight, portable, and quiet enough to live with.
Weight, footprint, handle, and wheels, versus its size class.
Fan noise under load — quieter is better for bedrooms and CPAP use.
How this score is computed
We score the hardware using sourced specifications and independently attributed measurements. Seven sub-scores form a 0–100 composite, grouped into four buyer pillars. The score is price-independent: a sale changes what you pay, while this analysis evaluates the station's capabilities within its size class.
| Pillar | Built from |
|---|---|
| Power | Capacity & expansion + Output & versatility |
| Trust | Trust & reliability + Durability & longevity |
| Charging | Charging & solar |
| Livability | Portability + Quiet / livability |
Scores are cohort-relative — each model is ranked against others in its size class. Missing inputs renormalize out rather than scoring zero. Incomplete evidence can leave a sub-score unavailable; it does not establish that a model performs well. Any figure resting on a documented estimate is tagged est. Read our scoring and evidence methodology.
Full specifications
Manufacturer-claimed unless marked verified (FCC/UL/DOE/lab). Tap or focus a figure to view its source.
Capacity & battery
- Rated cycle life
3,000 cycles. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- Battery chemistry
LiFePO4. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- Rated capacity
512 Wh. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- Cycle-life threshold
80 %. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf
How many full charge-and-drain cycles before the battery drops to its rated threshold (shown alongside — brands rate to different thresholds, so never compare bare cycle counts).
The type of battery cell. LiFePO4 (LFP) cells last far more cycles and are more thermally stable than older lithium-ion (NMC) cells.
The battery's nameplate energy capacity — the headline number on the box. Battery-side usable and AC-delivered capacity are shown separately.
The remaining-capacity level the cycle rating is measured to. 3,000 cycles to 80% is a stronger battery than 3,000 cycles to 70% — always read the two numbers together.
Power output
- Continuous power output
500 W. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- Surge power output
1,000 W. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- AC outlets
4 outlets. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- USB-A ports
3 ports. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- USB-C ports
1 ports. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- USB-C max output
100 W. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- 12V car ports
1 ports. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- DC barrel ports
2 ports. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf
The most power you can draw at once, sustained — this has to be higher than the running wattage of whatever you're plugging in.
A brief power spike the unit can absorb when a device first switches on — matters for things with motors or compressors, like fridges.
How many standard wall-style outlets are built in.
How many USB-A ports are built in, for charging older phones, lights, and accessories.
How many USB-C ports are built in — check the per-port wattage below if you need fast charging for a laptop.
The fastest a single USB-C port can charge a device — relevant for laptops and fast-charging phones.
How many car-socket (cigarette-lighter) style 12V outputs are built in. Match the device or its supported converter to the port's voltage and current limits; a CPAP needs its exact model's documented power connection.
How many round barrel-style DC outputs are built in, used by routers, some lights, and older electronics.
Charging & solar
- AC recharge speed
660 W. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf- Max solar input
220 W. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf
How fast the unit recharges from a wall outlet — higher means shorter waits between uses.
The most solar panel wattage the unit can accept — undersized panels just mean slower charging, not damage, but oversizing this is wasted money.
Reliability & durability
- UPS switchover time
30 ms. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf
How fast the unit takes over when grid power cuts out. Under ~20ms is fast enough that most electronics — including many CPAP machines — won't even blip.
Size & portability
- Weight
6.1 kg. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com2026-07-27https://ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com/cms/manual/1753869573684/RIVER%202%20Max%20%26%20RIVER%202%20Max%20500%20Portable%20Power%20Station_User%20Manual.pdf
How much the unit weighs on its own, without accessories — relevant for portability and carrying it up stairs during an outage.
What reviewers & owners report
Named outlets and marketplaces, each rating credited where it was published.
What else to consider instead of the EcoFlow RIVER 2 Max 500
Same or adjacent size class, ordered by the price-independent composite. Every alternative is better than the EcoFlow RIVER 2 Max 500 at something and worse at something else, so each row states both halves — each one arithmetic on two sourced readings, with a dimension skipped rather than guessed when either side is missing a figure.
- Bluetti AC70score 71 · same size class
- Why you would switch
- The Bluetti AC70 delivers 50% more usable AC energy (653 Wh vs 435 Wh).
- What you give up
- The EcoFlow RIVER 2 Max 500 is 40% lighter (6.1 kg vs 10.2 kg).
- Anker SOLIX C800 Xscore 63 · same size class
- Why you would switch
- The Anker SOLIX C800 X delivers 33% more usable AC energy (580 Wh vs 435 Wh).
- What you give up
- The EcoFlow RIVER 2 Max 500 is 44% lighter (6.1 kg vs 10.9 kg).
- EcoFlow RIVER 2 Pro (700)score 60 · same size class
- Why you would switch
- The EcoFlow RIVER 2 Pro (700) delivers 40% more usable AC energy (609 Wh vs 435 Wh).
- What you give up
- The EcoFlow RIVER 2 Max 500 is 22% lighter (6.1 kg vs 7.8 kg).
- Dabbsson 600Lscore 55 · same size class
- Why you would switch
- The Dabbsson 600L delivers 50% more usable AC energy (653 Wh vs 435 Wh).
- What you give up
- The EcoFlow RIVER 2 Max 500 is 24% lighter (6.1 kg vs 7.98 kg).
- Jackery Explorer 600 v2score 52 · same size class
- Why you would switch
- The Jackery Explorer 600 v2 delivers 25% more usable AC energy (544 Wh vs 435 Wh).
- What you give up
- The EcoFlow RIVER 2 Max 500 reaches a full AC charge in 47 minutes against 100.
Quick answers
Each answer restates a sourced figure from elsewhere on this page — nothing new, nothing guessed.
- How many milliamp-hours (mAh) is the EcoFlow RIVER 2 Max 500?
- Its manufacturer-claimed capacity is 512 Wh. A mAh conversion also needs the battery's nominal voltage: mAh = Wh × 1,000 ÷ V. Our record has no sourced nominal battery voltage, so we leave the mAh figure unspecified. USB output voltage is not a substitute for battery voltage. Compare watt-hours across power stations.
- How much capacity does the EcoFlow RIVER 2 Max 500 deliver through an AC outlet?
- About 435 Wh of the rated 512 Wh reaches an AC outlet from a full charge — an estimate after our published 15% inverter-loss constant (marked est. on this page).
- What is the cycle-life rating of the EcoFlow RIVER 2 Max 500?
- 3,000 cycles to 80% remaining capacity, manufacturer-claimed. A cycle rating is not a calendar-life guarantee.
- Can the EcoFlow RIVER 2 Max 500 work as a UPS?
- Its manufacturer-claimed transfer time is 30 ms. Confirm that your connected equipment tolerates that transfer time; this is not the same as a zero-transfer online UPS.