Head-to-head test
EcoFlow RIVER 2 Max vs Anker 535 PowerHouse
The RIVER 2 Max is sold out at EcoFlow, so the Anker 535 PowerHouse is the only one of these two you can buy new: it matches the EcoFlow on capacity and output and gives up the UPS mode, the app and the faster solar, so those three features decide whether you buy it or go look at the RIVER 2 Max 500.
Full profiles: EcoFlow RIVER 2 Max → · Anker 535 PowerHouse →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
Spec deltas
EcoFlow's store has the RIVER 2 Max sold out in every version, so this comparison has exactly one candidate you can buy new: the Anker 535 PowerHouse. EcoFlow sells the RIVER 2 Max 500 in its place and describes it as the same unit with a slightly smaller battery. This page can't price or spec that one, so it compares the two in front of it, and the RIVER 2 Max's numbers still hold for anyone who owns one.
On the headline specs they're twins: 512Wh, 500W continuous, 3,000-cycle LiFePO4 cells, a 5-year warranty, and the same four AC outlets, three USB-A ports and one USB-C. Identical tanks mean every scenario on this page lands on identical percentages. The CPAP night is the only one either finishes, and both finish it with 115Wh to spare.
Every difference sits on the RIVER 2 Max's side of the table: a listed UPS mode, an app, 220W of solar input against 120W, 100W USB-C against 60W, and 3.3 lbs less to carry. The Anker gives all of that up and asks you to charge it from a wall. If that's how you'd use it anyway, buy it. If the UPS mode or the solar speed was the reason you came, look at the RIVER 2 Max 500 first.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
solar input
That's most of a summer day's usable sun for one tank, and anything you run while the panel works comes out of the same budget. The RIVER 2 Max's 220W input did the same refill in about 2.3 hours on paper (512Wh at 220W), which makes solar the single biggest thing the Anker gives up.
535 PowerHouse solar input: 120WBoth batteries: 512WhOne review found the 535's solar input realistically delivers 60-75WB4RIVER 2 Max solar input: 220W
Why it mattersIf panels are your recharge plan, treat the Anker as a wall-charged battery that accepts a solar top-up, and shop for a station with a much larger solar input instead.
Even that UPS mode was a router-and-modem feature more than a desktop one: a transfer as long as 30ms is one many desktop PCs won't ride through. The Anker has no such mode at all, so it's power you move your plugs to when the lights go out, not power that catches the drop for you.
RIVER 2 Max lists a UPS mode with a switchover rated no worse than 30ms535 PowerHouse lists no UPS mode, and its switchover is not stated
Why it mattersIf keeping a router or modem online through outages is the job, the Anker is the wrong tool; check the RIVER 2 Max 500's own spec sheet or buy a dedicated UPS.
One review found the 535 stable and cool at its full 500WB3, which is twelve and a half times a CPAP's draw (500W divided by 40W). That's a fair hint a bedside load won't work it hard. It is not a decibel reading, and nothing in the record supplies one.
CPAP Overnight: about 40W for 8 hours is 320Wh, against 435Wh usable on both, leaving 115WhRIVER 2 Max publishes 62dB as a maximum under heavy load; the 535 PowerHouse publishes no noise figureOne review found the 535 stable and cool at its full 500W outputB3
Why it mattersCPAP users can buy the Anker on capacity with confidence, then spend the first night listening before trusting it with every night after.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: Four of the six cards cut against the Anker and one against the RIVER 2 Max; this is the list of everything the Anker gives up.
Four of the six cards cut against the Anker: no UPS mode, no app, the slower solar refill, and no published noise figure. One cuts against the RIVER 2 Max, its 62dB ceiling, and the warranty card is a draw at 5 years each. On a normal page that tally would settle things. Here the unit holding the better cards is the one EcoFlow has sold out of, so read them as a receipt for what the Anker leaves out, not as a reason to hunt for leftover stock.
The Anker's catch, said plainly: it's a battery you walk over to, not one that looks after you. No app means checking the charge in person, no UPS mode means it won't catch a grid drop on its own, and a 120W solar ceiling means panels top it up rather than refill it. None of that matters on a wall-charged CPAP night. All of it matters if the plan was an unattended router backup fed from a panel on the porch.
Your Life, Your Pick
Selected because: Both carry 512Wh, so every scenario reads the same for both, and the CPAP night is the only one either finishes.
Identical tanks make identical scorecards. Every scenario shows the same percentage for both, so this section can't pick a winner and doesn't try. The CPAP night is the one both finish, using 74% of the 435Wh each has after the page's flat 85% usable derate.
The shortfalls are the useful part. The tailgate comes up 235Wh short with both holding its 400W peak, so that's one you plan around: start full and drop the biggest load. The 8-hour blackout wants 1,645Wh, more than three times either tank, and both cover about a quarter of it. That isn't a choice between these two. It's a different size class.
Portability & Form Factor
Selected because: The one physical difference between them: 13.4 lbs against 16.7.
weight
3.3 lbs separates them: 13.4 for the RIVER 2 Max, 16.7 for the Anker. Both are one-hand carries from the trunk to the picnic table, and neither asks for a second person or a cart. You'll notice the gap on the stairs with a cooler in your other hand, not across a parking lot.
So weight is no reason to chase the retired unit. An owner already has the lighter box; a new buyer gets the Anker, which one review called compact for a 512Wh unitB2.
Brand Trust
Selected because: With one unit retired, out-of-warranty support and the future of the app matter more than they usually would.
The brand column carries more weight than usual when one unit is retired. EcoFlow offers no parts or service out of warranty, so a RIVER 2 Max owner's support ends when the 5-year term does. EcoFlow also tested putting advanced app features behind a subscription in early 2025 before pausing the plan, which is worth knowing when the app is one of the RIVER 2 Max's clearest advantages.
Anker built its name on no-hassle replacements, but its power-station support has drifted toward generic, automated responses, and its firmware updates have removed features without warning. Neither caveat is a reason to skip the 535. Both are a reason to buy it from a retailer whose return policy you'd trust more than a support queue.
Strengths & trade-offs
EcoFlow RIVER 2 Max
Strengths
- +Lighter by 3.3 lb
- +Faster solar charging
Trade-offs
- –Can receive complaints about fan noise under heavy load.
Anker 535 PowerHouse
Strengths
- Solid all-rounder with standard specs.
Trade-offs
- –Lacks smartphone app control for remote monitoring.
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 unit covers this scenario's 2,100Wh: the RIVER 2 Max comes up 1,665Wh short (about 21% covered), the 535 PowerHouse 1,665Wh (21%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
Neither unit
Neither covers it: 1,645Wh against 435Wh usable leaves both 1,210Wh short, about a quarter of the list. Treat either one as cover for the essentials, not the whole night's load.
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
Both cover it: about 40W for eight hours is 320Wh, leaving each 115Wh of its 435Wh usable, so capacity decides nothing. The Anker takes it for a new buy because it's the one still sold. Neither gives you a bedside noise reading (the RIVER 2 Max's 62dB is a published maximum under heavy load, and the Anker publishes nothing), so judge it by ear on the first 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
Neither unit covers this scenario's 910Wh: the RIVER 2 Max comes up 475Wh short (about 48% covered), the 535 PowerHouse 475Wh (48%). Treat this as partial cover — enough for the essentials in it, not the whole list.
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 finishes: 670Wh against 435Wh usable leaves both 235Wh short. Both hold the 400W peak, so this is an energy problem, not a power one. Start full, drop the biggest draw, and either gets you about two-thirds of the way.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
Neither unit covers this scenario's 4,685Wh: the RIVER 2 Max comes up 4,250Wh short (about 9% covered), the 535 PowerHouse 4,250Wh (9%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
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
Dead heat — both run this 205W load for roughly 2.1h. Pick on price, weight, or ports.
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 0–29hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–5.8hHigh-Draw Appliances
These reveal the real limits¹ 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
October 11, 2026
Verdict: the Anker 535 PowerHouse
Buy the Anker 535 PowerHouse. EcoFlow has sold out of the RIVER 2 Max in every version, and on the specs the two share (512Wh, 500W continuous, 3,000-cycle cells, a 5-year warranty, the same outlet count) the Anker gives nothing up. What it does give up is the RIVER 2 Max's listed UPS mode, its app, its 220W solar input against 120W and its 100W USB-C against 60W. That makes the Anker the right buy for someone who charges from a wall and runs a CPAP, a laptop or a tailgate's worth of small loads. If the UPS mode or the solar speed is why you were looking at the RIVER 2 Max, open EcoFlow's RIVER 2 Max 500 before you check out.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of October 11, 2026. The links below open Anker's current price.
$299.99 · direct from Anker
Last checked 28 days ago. Prices move — check before you buy.
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated October 11, 2026
Black Friday · 26 days out
Price to beat:535 PowerHouse $300
We have never seen it discounted, so any real cut 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): CPAP, 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 2 Max rates 3.7/5 (26th percentile of 20 Compact-class units), and 535 PowerHouse rates 3.7/5 (21st 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.
RIVER 2 Max: 62dB Is a Ceiling, Not an Idle
EcoFlow publishes the RIVER 2 Max's 62dB as a maximum, reached while charging or discharging at high wattage, so a light load sits well below it. It's EcoFlow's own rating rather than a bench reading, and it's the only noise figure on this page.
535 PowerHouse: Solar Recharge Takes 4.3h+
At its 120W rated solar ceiling, refilling the full 512Wh takes about 4.3 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.
535 PowerHouse: No App Control
Without app control, you have to physically walk to the 535 PowerHouse to check battery level, adjust settings, or monitor power draw. The RIVER 2 Max lets you do all that from your phone, including getting low-battery alerts.
Only the RIVER 2 Max Lists a UPS Mode
The RIVER 2 Max can sit between the wall and your gear and take over when the grid drops, rated at no worse than 30ms. That's quick enough for a router or modem and long enough that many desktop PCs will reboot anyway. The 535 PowerHouse lists no UPS mode, so treat it as power you move your plugs to, not power that catches the drop for you.
Warranty: 5 Years Each, No Tiebreak
Both records carry a 5-year term, so cover can't separate these two. What separates them is that the 535 PowerHouse is the one still on sale. A RIVER 2 Max owner holds the same length of term, and EcoFlow offers no parts or service once it ends, so the date on that receipt is worth knowing.
535 PowerHouse: No Noise Figure Published
Anker doesn't publish a noise level for the 535. That isn't evidence it's louder; it means there's nothing to hold it to and no way to rank these two on noise without hearing them. For a bedroom or a CPAP, listen to it on the first night before you depend on it.
Full record above — the Test Desk pick is the 535 PowerHouse.
Check 535 PowerHouse price →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 RIVER 2 Max is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the 535 PowerHouse works out at $0.20/kWh over its rated life. If you already own the RIVER 2 Max, the hardware comparison still holds: each delivers about 1,536 kWh over its rated life. One thing to know reading the table: both carry the same 3,000-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
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-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
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
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
US-based support. Historically known for incredible no-hassle replacements, but recent reports describe AI-driven support agents giving generic responses and complex return logistics for heavy units (hazmat shipping). The Anker brand reputation is still strong, but SOLIX-specific support quality is trending down.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
Parent brand trust from Anker's consumer electronics dominance. InfiniPower technology for long cycle life. Strong $/Wh value in the mid-size and larger units — the S2000, F2600 and C1000 are among the better buys per watt-hour in the catalog.
Worth knowing
Support quality appears to be declining from its historically excellent level. Firmware updates have removed features without warning. Expansion ecosystem is smaller than EcoFlow's.
Analyst note
EcoFlow positions itself as a mid-to-premium brand with stronger support infrastructure, while Anker competes on value. The question is whether the EcoFlow ecosystem and support premium is worth it for your use case.
Growth path
RIVER 2 Max
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 220W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
535 PowerHouse
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 120W 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
Growth only counts if you can still buy in, and the RIVER 2 Max is no longer sold (EcoFlow points owners to the RIVER 2 Max 500). That leaves the 535 PowerHouse: it is sealed at 512Wh, so buy the size that covers you now. The RIVER 2 Max's fixed 512Wh still matters if you already own one, but it isn't a reason to pick it over the 535 PowerHouse.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow RIVER 2 Max
Reviewers keep landing on the same three things: about 13 lbs for 512WhA1, a full wall recharge in roughly 60 minutes on X-Stream chargingA2, and an app that reads charge level and adjusts charging speed over WiFi or BluetoothA3. In one field test it ran a telescope, a 65-inch TV, two laptops and phones through a 4-hour event with power left overA4. For anyone who already owns one, that's the record they're holding.
“512Wh in a light package of about 13 lbs, lighter than some of its closest competitors that use Li-Ion chemistry.”
Sources
storagereview.com · backuppowerhub.com · gagadget.com · ecoflow.com · thecampingnerd.com · thetechnologyman.com · bestbuy.com
Anker 535 PowerHouse
The 535's file is reviewer-heavy and consistent: LiFePO4 cells rated for 3,000+ cycles behind a 5-year warrantyB1, and a body one review called compact for its capacity, with four AC outlets, three USB-A, a USB-C and a car outletB2. One bench test measured 89% round-trip efficiency and found it stable and cool at its full 500WB3. Our research files it as an older design that's still a sound weekend unitB0.
The complaint is charging speed. AC charging to 80% takes about 2.5 hours, and solar input that caps at 120W realistically delivered 60-75W in testingB4. Plan on the wall outlet being its real charger.
“512Wh capacity with 500W output on LiFePO4 cells rated for 3,000+ cycles and a 10-year lifespan, backed by a 5-year warranty.”
Sources
ankersolix.com · trustedreviews.com · macrumors.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
- Light weight, fast roughly-one-hour charging, and a simple capable app are the standout praise for this 512Wh unit. [RIVER 2 Max · 3 entries]
- Durable LFP (3,000+ cycles, 5-yr warranty), efficient, and compact for weekend camping; slow solar input is the caveat. [535 PowerHouse · 2 entries]
- A1
“512Wh in a light package of about 13 lbs, lighter than some of its closest competitors that use Li-Ion chemistry.”
storagereview.com / backuppowerhub.com — RIVER 2 Max review · 2026 · [positive]
- A2
“Fully charges in about 60 minutes via X-Stream charging — far faster than most portable power stations — with multiple charging options.”
gagadget.com / ecoflow.com — RIVER 2 Max review · 2026 · [positive]
- A3
“The EcoFlow app offers simple remote control and monitoring over WiFi and Bluetooth — view charge levels, customize settings, and adjust charging speed from a phone.”
thecampingnerd.com / ecoflow.com — RIVER 2 Max review · 2026 · [positive]
- A4
“Upgraded LFP chemistry rated for about 3,000 cycles, roughly a decade of everyday use; in field testing it powered a telescope, a 65-inch LED TV, two laptops, and phones through a 4-hour event with power to spare.”
thetechnologyman.com / bestbuy.com owner reviews — RIVER 2 Max · 2026 · [positive]
- B1
“512Wh capacity with 500W output on LiFePO4 cells rated for 3,000+ cycles and a 10-year lifespan, backed by a 5-year warranty.”
ankersolix.com / trustedreviews.com — 535 PowerHouse review · 2026 · [positive]
- B2
“Weighs 16.5 lbs and is compact for a 512Wh unit, with 4 AC ports, 3 USB-A, a USB-C, and a car outlet.”
macrumors.com / batteryessence.com — 535 PowerHouse review · 2026 · [positive]
- B3
“Demonstrated 89% round-trip efficiency and stayed stable and cool while delivering its full 500W AC output.”
batteryessence.com — 535 PowerHouse review · 2026 · [positive]
- B4
“AC charging to 80% takes about 2.5 hours; solar input caps at 120W (realistically 60-75W), so panel charging is slow.”
batteryessence.com — 535 PowerHouse review · 2026 · [mixed]
Research compiled October 11, 2026.
Who Should Buy Which
Buy the RIVER 2 Max if you…
- →You already own a RIVER 2 Max and wondered whether the Anker is a step up. Keep yours: the capacity and output match, and switching would cost you the UPS mode, the app and the faster solar.
- →You want what the RIVER 2 Max offered, new from EcoFlow. It's sold out; EcoFlow points buyers to the RIVER 2 Max 500, so read that model's own spec sheet before you buy anything.
Buy the 535 PowerHouse if you…
- →You run a CPAP and want a night covered from a wall charge: 320Wh for eight hours leaves 115Wh spare in its 435Wh usable.
- →You charge from an outlet between trips and want a 512Wh box for a tailgate, a campsite or a day of laptop work, with no app to set up.
- →Your laptop takes 60W or less over USB-C, and the rest of the list is phones, lights and small gear.
If neither fits
If the plan is a two-night camping trip, a full 8-hour blackout or living in a van, close this tab cheerfully. The blackout alone wants 1,645Wh, more than three times either 512Wh tank, and van life wants more than nine times. Look at a home-backup class station instead, and if solar is your recharge, pick one whose solar input dwarfs the Anker's 120W.
The Bottom Line
The RIVER 2 Max was the better-specified of these two, and EcoFlow has sold out of it. That leaves the Anker 535 PowerHouse: the same 512Wh and 500W, without the UPS mode, the app or the fast solar, and the right box for anyone charging from a wall to run a CPAP, a laptop or a tailgate's small loads.
If a wall outlet is your charger, buy the Anker and stop comparing. If the UPS mode or the solar speed is what you came for, the RIVER 2 Max 500 is the page to open next.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow RIVER 2 Max discontinued?
Yes. EcoFlow's store has the RIVER 2 Max sold out in every version, and the brand now sells the RIVER 2 Max 500 in its place, which it describes as the same unit with a slightly smaller battery. Its specs on this page still apply to units already out there.
Is the Anker 535 PowerHouse as good as the RIVER 2 Max?
On capacity, output, cycle rating, warranty and outlet count, yes: both are 512Wh, 500W continuous, 3,000 cycles, 5 years, four AC outlets. The Anker gives up the RIVER 2 Max's UPS mode, its app, its faster 220W solar input (the Anker takes 120W), its 100W USB-C (the Anker's is 60W) and a published surge rating. If you charge from a wall and don't need those, the Anker does the same job.
Can the Anker 535 PowerHouse run a CPAP all night?
Yes, with room left over. A CPAP at about 40W for eight hours uses 320Wh, which is 74% of the 435Wh the 535 has usable after the page's 85% derate, leaving 115Wh. Anker doesn't publish a noise figure, so give it a night at the bedside before you rely on it.
Does the Anker 535 PowerHouse work as a UPS?
Not by its spec sheet, which lists no UPS mode and no switchover time. The RIVER 2 Max lists one, rated no worse than 30ms, quick enough for a router and long enough that many desktop PCs reboot anyway. With the Anker, plan to move plugs over yourself when the grid drops.
How long does the Anker 535 PowerHouse take to charge from solar?
About 4.3 hours at its full 120W rating, and that's the floor. One review found it realistically took in 60-75W, which stretches a full 512Wh refill to roughly 7 to 8.5 hours. Treat solar as a top-up and the wall as the main charger.
Where to buy
EcoFlow RIVER 2 Max
Sold out at EcoFlow
Anker 535 PowerHousePick
$299.99
$299.99 · direct from Anker
Last checked 28 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.