Head-to-head test
EcoFlow RIVER 3 vs BLUETTI EP900 + 2×B500
One of these has left EcoFlow's range and the other needs an electrician, so the only live question is whether your outage problem is the size of a backpack or the size of a building.
Full profiles: EcoFlow RIVER 3 → · BLUETTI EP900 + 2×B500 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
EcoFlow has dropped the RIVER 3 from its store, so half of this comparison isn't for sale at any price. That settles the recommendation before the specs get a vote: the BLUETTI EP900 + 2×B500 is the only unit here you can still buy. What it doesn't settle is whether you should, because these two were never competing for the same money.
245Wh in one hand against 9,920Wh bolted to a subpanel. Divide one into the other and the BLUETTI holds about forty RIVER 3s' worth of battery, and none of it goes anywhere: its AC and 240V outputs both read Hardwired, with no USB ports and no 12V socket on the box. Power leaves that system through your house wiring or it doesn't leave at all.
So this page is for three people. Whoever already owns a RIVER 3 and wants to know what it still does, whoever found one sitting on a retailer's shelf, and the rarer reader actually costing out whole-home backup. If you came for the small EcoFlow, the line didn't end: the RIVER 3 PLUS is the smallest RIVER 3 EcoFlow still sells, and it's the live version of the question you were asking.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
weight
Watch what that does to the scenario grid. The EP900 has 8,432Wh usable against the 2,100Wh a camping weekend wants, four times what the job needs, and it still loses that row to nobody at all. Energy you can't bring is energy you don't have, and the tailgate and the van rows end the same way.
EP900 + 2×B500 ports: AC reads 'Hardwired', 240V reads 'Hardwired', 0 USB-A, 0 USB-C, 0 12V car socketsRIVER 3 ports: 2 AC outlets, 2 USB-A, 1 USB-C at 100W, 1 12V car socket, at 7.8 lbs343 lbs combined for the EP900 inverter and both B500 modules
Why it mattersIf the thing you want powered moves, the EP900's capacity is irrelevant at any price, and the RIVER 3 is no longer a unit you can buy to solve it.
Even if the inverter held, the battery wouldn't. 208Wh usable against 670Wh leaves it 462Wh short of a game day, so there are two separate ceilings here and the 245Wh printed on the box flatters both of them.
RIVER 3: 300W continuous, 600W published peakTailgate profile: a 400W peak draw across 670WhRIVER 3 usable energy of 208Wh after the flat 85% derate applied to every unit here
Why it mattersSize a small station off its continuous rating and its derated usable energy, never off the peak number, which is the same discipline that makes 7,600W continuous the figure worth reading on the BLUETTI side.
And an expensive fault here isn't a shipping label. This one is bolted to your panel, so a claim in year seven is a service call on installed hardware, arranged through the least consistent support desk in the category. The one lever you control is the purchase channel.
EP900 + 2×B500: a 10-year term on our record, 6,000 rated cyclesAt daily cycling those cycles run 16.4 yearsIt is a 343 lb system mounted at the electrical panelBLUETTI's support is the most inconsistent in the category, heavily email-based across time zones, with better outcomes for direct purchases
Why it mattersBuy this from BLUETTI directly and do the registration paperwork the week the electrician leaves; the 10-year term is the best thing about the purchase and the easiest to forfeit.
solar input
That ratio is what makes it a house asset rather than a backup box: it can swallow a full array's midday output instead of throttling it, which is why one owner running it tied to solar described being able to go virtually off-grid and cut the utility billB4. The RIVER 3's 110W into 245Wh is a couple of hours of good sun for a phone-charger's worth of energy.
EP900 + 2×B500 accepts 9,000W of solar inputIts two B500 modules hold 9,920Wh combined, 4,960Wh eachB2RIVER 3 accepts 110W of solar into 245Wh
Why it mattersBudget the array in the same conversation as the battery, because an EP900 bought without the roof to feed it is a very expensive UPS.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: seven load profiles run against both units, and exactly one of them, an afternoon of phones and a speaker, is a job both can finish.
Seven rows, and one of them is a real contest. Phones and a speaker across an afternoon comes to 100Wh, and both units clear it, the RIVER 3 finishing at 48% used and the EP900 barely registering the load. Every other row is decided before the two are compared at all, by where each one can physically be.
Which makes the blackout row the one to read closely. 1,645Wh across eight hours, and the EP900 covers it with 6,787Wh still in the bank, delivered through the house wiring rather than an extension cord run across the hall. The RIVER 3's 208Wh covers about one of those eight hours. That isn't a difference of degree; it's a difference in what the two objects are.
What the Specs Don't Tell You
Selected because: the cards that decide this pair are installation and coverage: 343 lbs mounted at an electrical panel, a 10-year term against 5, and two UPS ratings that protect very different amounts of house.
rated cycles
343 lbs sounds like a portability verdict and isn't one. That figure covers the EP900 and both B500 modules together, and you experience it exactly once, on the morning an electrician mounts the stack beside your panel. After that the relevant spec is clearance and wall space, not mass.
The pairing worth arguing with is the two UPS ratings. Rated ≤10ms against rated ≤20ms is a 10ms difference on paper and the smaller half of the story: the EP900's transfer covers every circuit it's wired into, while the RIVER 3's covers whatever is plugged into its two sockets. Same feature name, very different amounts of house, and both figures are published ceilings rather than stopwatch results.
Growth Path
Selected because: the EP900 starts at 9,920Wh and takes more B500 modules, while the RIVER 3 is sealed at 245Wh, so sizing is an ongoing decision on one side and a one-time decision on the other.
solar input
The 9,920Wh you start with is two B500 modules at 4,960Wh each, and the platform takes up to eight of them, out to about 39.6kWhB2. Know what adding one involves before you size down to save money: it's another module and another visit from whoever wired the first two, not an accessory you order on Friday and slot in on Saturday.
On the RIVER 3 side there's nothing to plan. It's sealed at 245Wh, and that's a real ceiling rather than a maxed-out design, since EcoFlow's own answer to it, the RIVER 3 PLUS, takes an extra battery. At this size the practical effect is simply that you buy the capacity you need on day one.
Brand Trust
Selected because: you are trusting one of these brands with hardware wired into your house for a 10-year term, which makes the support record more decision-relevant here than any spec.
Ten years of cover is worth exactly what the desk honoring it is worth, and BLUETTI's is the most inconsistent in the category: mostly email, mostly across China time zones, with noticeably better outcomes for people who bought direct instead of through a third party. On a system at $10,298 plus installation, that's not a footnote in the brand column. It's the risk line.
EcoFlow's side carries its own sting for this particular page. The company offers no parts or service outside warranty, and the RIVER 3 has now left the range, so the 5-year term is the entire safety net on this model. Worth knowing if you're chasing down leftover retail stock on the strength of an old review.
Strengths & trade-offs
EcoFlow RIVER 3
Strengths
- +Lighter by 335.2 lb
Trade-offs
- –Weaker inverter (-7,300W) limits appliance compatibility.
- –Sealed capacity — the EP900 + 2×B500 can add batteries to grow past 245Wh; this one can't.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the EP900 + 2×B500's 6,000, so it wears out sooner.
BLUETTI EP900 + 2×B500
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Significantly heavier (+335.2 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on seven 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 of these gives you a powered weekend, for opposite reasons. The EP900 has the energy four times over, 8,432Wh usable against the 2,100Wh this asks for, and it's bolted to a subpanel, so it isn't coming. The RIVER 3 comes easily at 7.8 lbs and runs dry about a tenth of the way in. Placement is the whole row: one can't leave the house, the other can't last the trip.
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
EP900 + 2×B500
This is the row the EP900 exists for, and the only one where the comparison is even honest. It covers the 1,645Wh with 6,787Wh still in the bank, and it does it through the house wiring rather than an extension cord across the hall, so nothing you own finds out the grid went down. The RIVER 3's 208Wh usable covers about one hour of the eight.
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
EP900 + 2×B500
The EP900 takes a 320Wh night without noticing, at 4% of what it holds. The number worth reading is the other one: 208Wh usable leaves the RIVER 3 112Wh short, which is roughly two-thirds of a night and then a machine going quiet before morning. Two-thirds of a night is worse than none, because you'll have planned around it.
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
EP900 + 2×B500
The RIVER 3 doesn't finish — 208Wh usable against the 910Wh this needs leaves it 702Wh short, about 23% of the scenario covered. The EP900 + 2×B500 covers it with 7,522Wh 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
400W is where the RIVER 3's two ratings part company. The 600W peak gets the load moving, then the 300W continuous rating is what has to hold it, and it can't. The battery agrees anyway: 208Wh usable against the 670Wh a game day wants leaves it 462Wh short. The EP900 wouldn't notice either figure and also isn't coming to the parking lot, which is why this row has no winner.
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 gives you a powered van: the EP900 + 2×B500 has the energy but is wired to the building, and the RIVER 3 covers about 4% of the 4,685Wh. One can't go; the other can't finish.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
SCN-07 · an afternoon · needs 100Wh
Afternoon Off-Grid
Phones and a speaker at the park, beach, or campsite — the small-unit job description
Either unit
Phones and a speaker across an afternoon, 100Wh, is the one job on this page both units finish: a rounding error to a 9,920Wh wall system, and a little under half of the RIVER 3's 208Wh usable. Which tells you more about the job than about the units. If this row is your life, you want the carry-it-in-one-hand class rather than either of these, and with the RIVER 3 out of EcoFlow's range, the RIVER 3 PLUS is where that line continues.
Battery budget usedlower = more headroom
LOAD Phone Charger (×2) 30W×2h · Bluetooth Speaker 10W×4h
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: EP900 + 2×B500 runs 41.1h vs 1h.
$10,298 list · direct from BLUETTI
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 0–562.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–112.4hHigh-Draw Appliances
These reveal the real limitsscale 0–8.4h¹ 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 EP900 + 2×B500, on Power Score margin
Take the EP900 + 2×B500, with the caveat that 'take' is doing unusual work here. It wins because EcoFlow has dropped the RIVER 3 from its store, and because it is the unit with the energy to finish all seven load profiles on this page while the RIVER 3 finishes exactly one. If your problem is the building, with the fridge, the furnace and the router riding through an outage on a rated ≤10ms transfer, it is a genuinely good answer at $10,298 plus an electrician's morning. If your problem is a campsite or a carry bag, it is not an answer at all, and three of those seven profiles happen somewhere a hardwired system cannot go. That reader should leave this page for the RIVER 3 PLUS rather than buy 343 lbs of subpanel hardware.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open BLUETTI's current price.
$10,298.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Price to beat:EP900 + 2×B500 $10,298
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): UPS, Home Backup, CPAP, 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, RIVER 3 rates 4.1/5 (48th percentile of 24 Personal-class units), and EP900 + 2×B500 rates 3.7/5 (21st percentile of 29 Whole-Home / Off-Grid-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.
343 lbs Is the Whole Stack, Once
That 343 lbs covers the EP900 inverter and both B500 modules together, not each unit, so don't multiply it. And you meet the number exactly once, on the morning an electrician mounts the stack beside your panel; after that the spec that matters is clearance and wall space. The RIVER 3's 7.8 lbs is the opposite kind of number, one you feel every time you pick it up, which is the entire point of it.
EP900 + 2×B500: 50dB Published
50dB is about as loud as moderate rainfall. The RIVER 3 is rated 30dB, and the two are not the same kind of figure: the RIVER 3's is a MAXIMUM under heavy charge and discharge, while the EP900 + 2×B500's is its maker's best case — so the real gap can only be wider than the numbers suggest: the RIVER 3's ceiling already sits below the EP900 + 2×B500's floor. For most people, fan noise around 45dB and up is where sleep starts to suffer.
Expansion Here Means Another Install
The EP900 grows by adding B500 modules to the 9,920Wh it starts with, which is genuinely more headroom than the RIVER 3's sealed 245Wh will ever have. Be honest about what adding one costs you in practice, though: it's another module and another visit from whoever wired the first two, not something that arrives Friday and slots in Saturday. Size it for the loads you actually want carried, up front.
Two UPS Ratings, Two Different Amounts of House
Rated ≤10ms against rated ≤20ms is the smaller half of this difference. The EP900's transfer covers every circuit it's wired into, so the fridge, the furnace and the router ride through together; the RIVER 3's covers whatever is plugged into its two sockets. Both are published ceilings rather than measured results, so read them as the class each maker is claiming, not as a stopwatch reading.
Warranty: 10 Years Against 5
The EP900 + 2×B500 carries a 10-year term on our record; the RIVER 3 carries 5. On an installed system the length matters more than it looks, because a fault in year seven is a service call on hardware bolted to your panel rather than a box you put back in the carton. Two things protect that term: buy direct from BLUETTI rather than through a third party, and register it the week the electrician leaves. Cover you have to argue for is cover you may not get.
Battery Lifespan in Real Years
The EP900 + 2×B500 is rated for 6,000 cycles vs 3,000. In real life: at daily use, that's 16.4 vs 8.2 years. At weekend use (twice a week), it's 58 vs 29 years. One caution reading years across different sizes: a cycle is 9,920Wh on the EP900 + 2×B500 and 245Wh on the RIVER 3, so count lifetime energy — roughly 59,520 kWh against 735 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
Full record above — the Test Desk pick is the EP900 + 2×B500.
Check EP900 + 2×B500 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 3 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 EP900 + 2×B500 works out at $0.17/kWh over its rated life. If you already own the RIVER 3, the hardware comparison still holds: over its rated life the RIVER 3 delivers about 735 kWh and the EP900 + 2×B500 about 59,520 kWh.
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
EcoFlow's support runs hot and cold: prepaid-label replacements at one end, long waits and refurbished units sent against new claims at the other. Buying through a retailer with its own returns desk has been the usual hedge.
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 or service outside warranty, which lands differently now the RIVER 3 has left the range. The 5-year term is the whole of the safety net on this model.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship portable (Apex 300, 2764.8Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The least consistent support desk in the category, mostly email and mostly across China time zones. Buying direct from BLUETTI rather than a third-party seller is the one lever that reliably improves the outcome, and on hardware an electrician installs it's worth pulling.
Community
Active and growing — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
BLUETTI's range runs from pocket units to sodium-ion cold-weather designs and balcony storage, and the EP900 sits at the end of it that ties into a subpanel and a 240V circuit instead of sitting on a countertop.
Worth knowing
Customer support inconsistency is the #1 risk factor. Older/discontinued units may become unrepairable — no spare parts policy for some models. Some reports of erratic communication from support agents.
Analyst note
One of these brands still sells the unit on this page. That single brand fact decides the recommendation here, and everything else in this column is context for the one you can actually put on a wall.
Growth path
RIVER 3
FIXED CAPACITYFixed at 245Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 110W of solar. Limited to a single portable panel.
Limited ports. You'll likely need a power strip or splitter.
EP900 + 2×B500
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 9,920Wh.
Accepts up to 9,000W of solar. Enough for a serious multi-panel array.
Limited ports. You'll likely need a power strip or splitter.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
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 3 is no longer sold (EcoFlow points owners to the RIVER 3 PLUS). That leaves the EP900 + 2×B500: it starts at 9,920Wh and takes BLUETTI expansion batteries, so the ceiling moves if your needs do. The RIVER 3's fixed 245Wh still matters if you already own one, but it isn't a reason to pick it over the EP900 + 2×B500.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow RIVER 3
The RIVER 3's record is comparative rather than long-term. Nearly everything on file measures it against the RIVER 2, where it wins on every axis that matters: more capacity, less weight, IP54 sealing, a faster UPS switchover and a 2x runtime modeA2A4. EcoFlow's framing calls it whisper quiet under 30 dB and reviewers treated that as the headline upgradeA1, though the RIVER series publishes that figure as a maximum under heavy charge and discharge rather than a best case, so a light load sits below it. Our own coverage note is blunt about the limits of all this: directional sentiment from review sites and EcoFlow's comparison material, not years of accumulated owner reportsA0. It was still being recommended for camping, van life and home UPS duty in 2026A3, which mostly tells you what kind of buyer is now looking for the RIVER 3 PLUS.
“The RIVER 3 operates under 30 dB — EcoFlow calls it 'whisper quiet,' quieter than a library — one of the most significant upgrades over the louder RIVER 2.”
Sources
backuppowerhub.com · ecoflow.com · rv.com · versus.com
BLUETTI EP900 + 2×B500
The EP900's file is platform-level, not configuration-level, and our coverage note says so outright: it covers the EP900 + B500 platform, and the various multi-battery configurations share the same entriesB0. Read it as evidence about the system rather than about this two-module build specifically. Within that, one owner reported the grid-to-battery transfer is completely unnoticeable during an outageB3, which is what a rated ≤10ms figure is supposed to buy. Another, running it tied to solar, described being able to go virtually off-gridB4. The platform is described throughout as running a washer, dryer, heater and refrigerator from a single inverterB1, which is the tell: it's sized for appliances on circuits, not devices on a bench.
“A whole-home system: one EP900 inverter provides up to 9,000W (18,000W with two units), enough to run a washer, dryer, heater, and refrigerator.”
Sources
bluettipower.com · bestgeneratorsolar.com · mightygenerators.com · bgr.com · offgridsource.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
- The RIVER 3 improves on the RIVER 2 across the board — quieter (sub-30 dB), IP54-rugged, faster UPS, more capacity, lighter, and cheaper — a rare strict upgrade. [RIVER 3 · 3 entries]
- Whole-home 9,000W output, large B500 expandability (to ~39.6kWh), 10ms UPS, and solar off-grid capability are the standout features. [EP900 + 2×B500 · 3 entries]
- A1
“The RIVER 3 operates under 30 dB — EcoFlow calls it 'whisper quiet,' quieter than a library — one of the most significant upgrades over the louder RIVER 2.”
backuppowerhub.com / ecoflow.com — RIVER 2 vs RIVER 3 · 2026 · [positive]
- A2
“Over the RIVER 2, the RIVER 3 adds IP54 waterproofing, a faster UPS switchover, a 2x runtime mode, and a more compact, lighter form factor.”
backuppowerhub.com — RIVER 2 vs RIVER 3 · 2026 · [positive]
- A3
“Recommended as the better buy for most in 2026 — for camping, van life, or home UPS backup, where durability and noise matter, the data consistently favors the RIVER 3.”
backuppowerhub.com / rv.com — RIVER 3 review · 2026 · [positive]
- A4
“Holds more capacity and weighs less than the RIVER 2 while costing less, making it effectively a strict upgrade on the same platform.”
ecoflow.com / versus.com — RIVER 2 vs RIVER 3 · 2026 · [positive]
- B1
“A whole-home system: one EP900 inverter provides up to 9,000W (18,000W with two units), enough to run a washer, dryer, heater, and refrigerator.”
bluettipower.com / bestgeneratorsolar.com — EP900 + B500 guide · 2026 · [positive]
- B2
“With B500 batteries (4,960Wh each), capacity expands from 9.9kWh up to about 39.6kWh with eight B500 modules — weeks of essential backup.”
bluettipower.com / mightygenerators.com — EP900 + B500 · 2026 · [positive]
- B3
“A fast UPS switches from grid to battery within 10 milliseconds; one owner reported the transfer is completely unnoticeable during outages.”
bgr.com / owner review — EP900 + B500 · 2026 · [positive]
- B4
“Built on reliable LiFePO4 cells; tied to solar, an owner said they can virtually go off-grid and minimize utility bills. Complete systems run roughly $14,500-$15,000 excluding installation.”
bgr.com / offgridsource.com — EP900 + B500 review · 2026 · [positive]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the RIVER 3 if you…
- →You already own one. Nothing about it got worse when the listing came down: it still covers an afternoon of phones and a speaker at 48% used, still transfers in a rated ≤20ms for a router, and still weighs 7.8 lbs.
- →You've found leftover retailer stock and want to know the ceiling before you click. It's 245Wh and 300W continuous with no expansion, so a fridge across a hot weekend was never in scope, and EcoFlow's current answer in that size class is the RIVER 3 PLUS.
Buy the EP900 + 2×B500 if you…
- →Your outage problem is the building. 8,432Wh usable, wired into the panel, transferring at a rated ≤10ms so the fridge, the furnace and the router never learn the grid blinked.
- →You have roof to spare. 9,000W of solar input against 9,920Wh of storage means the array can refill the whole bank inside a peak-sun hour, which is the difference between a backup box and a house asset.
- →You were pricing a standby generator. This runs on a battery and a roof instead of stored fuel, it's rated for 6,000 cycles, and it needs the same electrician's morning you'd have paid for anyway.
If neither fits
The van-lifer and the weekend camper. The van profile alone wants 4,685Wh on wheels, which is neither a 245Wh handheld nor a 343 lb fixture wired to a subpanel, and the camping and tailgate rows come back with no winner for exactly that reason. Shop the large-portable class instead, the kind with a handle and a socket panel. And if you landed here wanting a small EcoFlow, close the tab and go look at the RIVER 3 PLUS.
The Bottom Line
The EP900 + 2×B500 wins this page because it's the only unit on it you can buy, and it earns the win on its own merits for exactly one kind of buyer: the one whose outage problem is a building. 8,432Wh usable behind a rated ≤10ms transfer, wired into the panel so the fridge and the furnace never learn the grid blinked, with 6,000 cycles and a 10-year term behind it. Buy it direct, register it the week it goes in, and budget the electrician and the array in the same conversation.
If you got here because you wanted a 7.8 lb box for phones, a laptop and an afternoon, nothing on this page is your answer. The RIVER 3 did that job and EcoFlow has stopped selling it; the EP900 does a different job and can't be carried to yours. Close the tab on both and go look at the RIVER 3 PLUS.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow RIVER 3 discontinued?
Yes. EcoFlow has dropped it from its store, which is why this page shows no price and no buy link for it. Its specs are still accurate and still worth comparing if you own one or turn up leftover retailer stock. The smallest RIVER 3 EcoFlow still sells is the RIVER 3 PLUS.
Can I use the BLUETTI EP900 + 2×B500 for camping or in an RV?
No. Its AC and 240V outputs are hardwired into a building's electrical panel, and our record shows no USB ports and no 12V socket on the box. It also weighs 343 lbs for the inverter and both battery modules together. Carrying it isn't a question of effort; there would be nothing to plug into when you arrived.
How long will the BLUETTI EP900 + 2×B500 run my house in an outage?
It holds 9,920Wh, which is 8,432Wh after the flat 85% derate applied to every unit on this site. Our eight-hour blackout profile draws 1,645Wh across fridge, lights, router and phones, and the system finishes that with 6,787Wh to spare, so at that rate of draw it covers roughly five such stretches. Run central air or an electric range and the arithmetic changes fast.
Can the EcoFlow RIVER 3 run a CPAP all night?
Not on our overnight profile. That profile needs 320Wh and the RIVER 3 has 208Wh usable, leaving it 112Wh short, or about two-thirds of a night. If you own one, treat it as a partial-night bridge or a daytime unit rather than the thing your therapy depends on.
What replaced the EcoFlow RIVER 3?
The RIVER 3 PLUS. It's the smallest RIVER 3 EcoFlow still sells, so it's the unit to compare against if you were shopping the RIVER 3's size class. The BLUETTI on this page isn't a replacement for it in any sense: it's an installed home system, not a portable one.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow RIVER 3
Left EcoFlow's store
BLUETTI EP900 + 2×B500Pick
$10,298.00
$10,298.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.