Head-to-head test
EcoFlow RIVER 3 vs BLUETTI Apex 300 + B500K
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Full profiles: EcoFlow RIVER 3 → · BLUETTI Apex 300 + B500K →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$239.00 · direct from EcoFlow
Last checked 13 days ago. Prices move — check before you buy.
$3,299.00 · direct from BLUETTI
Last checked 8 hours ago. Prices move — check before you buy.
Spec deltas
The EcoFlow RIVER 3 (245Wh) and BLUETTI Apex 300 + B500K (7,885Wh) sit in different weight classes. The real question: do your power needs justify the larger unit, or would you be overpaying for capacity that sits unused? These two aren't alternatives to each other. The Apex 300 + B500K holds 32× the energy and costs 17× as much, so this comes down to the load you need to cover rather than which unit is better. If the RIVER 3 carries your load, the Apex 300 + B500K is capacity you pay for and never use; if it doesn't, no amount of saving makes the RIVER 3 the answer.
What the spec gap means in practice: the Apex 300 + B500K's 3,840W inverter has the headroom for a window AC, a full-size fridge, and power tools. The RIVER 3's 300W inverter can't run the heaviest of those — a window AC or a high-surge power tool needs more than it can hold, whatever its 600W surge ceiling does at the instant of startup. On stamina, the Apex 300 + B500K keeps a fridge alive for roughly 45 hours vs the RIVER 3's 1 hours. The cost? Portability. At 183 lbs, the Apex 300 + B500K is spread across boxes you site once and leave. The RIVER 3 at 7.8 lbs is something one person can actually carry.
Pick the Apex 300 + B500K if your primary use is 8-hour blackout or cpap overnight. Go with the RIVER 3 if its specific strengths below line up better with your use. Most buyers stop at the sticker price and miss this: over a full lifespan the Apex 300 + B500K works out to about $0.07/kWh against the RIVER 3's $0.27, a gap that compounds in the Apex 300 + B500K's favor the more you cycle it. Keep scrolling for the full breakdown. The scenario verdicts below hold a few surprises.
Bench Notes
What each unit does well, where it falls short, and the trade-offs that matter.
EcoFlow RIVER 3
At 300W, this unit is strictly for personal electronics (phones, laptops) and small CPAP machines. Do not expect to run kitchen appliances. At only 7.8 lbs, it is exceptionally portable. You can easily carry it one-handed to a campsite or tailgating party.
Strengths
- +Costs $3,100 less
- +Lighter by 175.2 lb
Trade-offs
- –Weaker inverter (-3,540W) limits appliance compatibility.
- –Sealed capacity — the Apex 300 + B500K can add batteries to grow past 245Wh; this one can't.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the Apex 300 + B500K's 6,000, so it wears out sooner.
BLUETTI Apex 300 + B500K
With a massive 3,840W output (and 7,680W surge), the Apex 300 + B500K can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 183 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion. A standout feature is the value proposition: at roughly $0.42 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$3,100) than the RIVER 3.
- –Significantly heavier (+175.2 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 gives you a powered weekend: the Apex 300 + B500K has the energy but doesn't travel, and the RIVER 3 covers about 10% of the 2,100Wh. One can't go; the other can't finish.
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
Apex 300 + B500K
The RIVER 3 doesn't finish — 208Wh usable against the 1,645Wh this needs leaves it 1,437Wh short, about 13% of the scenario covered. The Apex 300 + B500K covers it with 5,057Wh to spare.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
Apex 300 + B500K
The RIVER 3 doesn't finish — 208Wh usable against the 320Wh this needs leaves it 112Wh short, about 65% of the scenario covered. The Apex 300 + B500K covers it with 6,382Wh to spare.
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
Apex 300 + B500K
The RIVER 3 doesn't finish — 208Wh usable against the 910Wh this needs leaves it 702Wh short, about 23% of the scenario covered. The Apex 300 + B500K covers it with 5,792Wh 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
Neither gives you a powered game day: the Apex 300 + B500K has the energy but doesn't travel, and the RIVER 3 can start the 400W peak but not hold it — 600W of surge gets it going, then the 300W continuous rating takes over. One can't go; the other can't finish.
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
Apex 300 + B500K
The RIVER 3 doesn't finish — 208Wh usable against the 4,685Wh this needs leaves it 4,477Wh short, about 4% of the scenario covered. The Apex 300 + B500K covers it with 2,017Wh to spare.
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
This row is here for the RIVER 3's class of job: phones and a speaker, 100Wh across an afternoon. Both cover it — the RIVER 3 finishes at 48% used, and the Apex 300 + B500K barely notices it. For this job the Apex 300 + B500K's extra capacity is dead weight, not headroom; take the RIVER 3 at 7.8 lbs and leave the rest at home.
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: Apex 300 + B500K runs 32.7h vs 1h.
$3,299 list · direct from BLUETTI
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 0–446.8hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–89.4hHigh-Draw Appliances
These reveal the real limitsscale 0–6.7h¹ 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 10, 2026
Verdict: the Apex 300 + B500K, on Power Score margin
These two units are closely matched on individual specs, but our Power Score analysis gives the Apex 300 + B500K the edge with a composite score of 7,493 vs 1,604.
Overall score margin: 1,604 vs 7,493 (−367.1%)
List prices as of July 10, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$3,299.00 · direct from BLUETTI
Last checked 8 hours ago. Prices move — check before you buy.
or check the RIVER 3 price$239.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 10, 2026
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.
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 4.4/5 (67th percentile of 22 Personal-class units), and Apex 300 + B500K rates 3.5/5 (11th 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.
Apex 300 + B500K: 183 lbs Is a Commitment
At 183 lbs across its boxes, no one piece is the whole problem — but this is hardware you site, not hardware you carry. Once it's set up, you won't want to move it. It's a semi-permanent appliance. Pick your spot.
Apex 300 + B500K: 45dB Published
45dB is about as loud as a running refrigerator. 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 Apex 300 + B500K's is its maker's best case — so the gap between them may be larger or smaller than it looks, not simply smaller. For most people, fan noise around 45dB and up is where sleep starts to suffer.
RIVER 3: Fixed Capacity
The RIVER 3 is sealed at 245Wh — fine if that covers you, but it's the ceiling. By contrast the Apex 300 + B500K can add expansion batteries, though the first thing it has over the RIVER 3 is its own 7,885Wh base — expansion is the step after that, for the buyer who would outgrow 7,885Wh as well.
UPS Switchover: ≤10ms vs ≤20ms
Both list a UPS mode, at different rated speeds. The Apex 300 + B500K is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The RIVER 3 is rated ≤20ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. The Apex 300 + B500K's figure is a maximum rather than a guarantee — it depends on buying direct from BLUETTI or registering the unit, since reseller purchases carry a shorter term. Worth saying because the per-dollar framing can suggest otherwise: the RIVER 3 works out at 25.1 years of cover per $1,000 spent against the Apex 300 + B500K's 1.5, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The Apex 300 + B500K 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 7,885Wh on the Apex 300 + B500K and 245Wh on the RIVER 3, so count lifetime energy — roughly 47,309 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 Apex 300 + B500K.
Check Apex 300 + B500K price →or check the RIVER 3 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 RIVER 3 is cheaper to buy, but the Apex 300 + B500K is cheaper to own. At $0.07/kWh over its lifetime vs $0.27/kWh, the Apex 300 + B500K's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $0.20 less — check the Apex 300 + B500K price →
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 very top of the range, the DELTA Pro Ultra platform stacks batteries and inverters into whole-home backup — a flagship path, not a line-wide feature.
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.
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 most inconsistent support in the space. Heavily email-based with China timezone delays. Some users get smooth, efficient service; others report weeks of troubleshooting runarounds, being offered discounts on new units instead of repairs, and confusing third-party purchase claim processes. Buying direct from Bluetti's website tends to produce better support outcomes.
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
Among the best capacity-to-price ratios available — several Elite and Apex units are the lowest $/Wh in the catalog. Widest product diversity including industry-firsts like sodium-ion cold-weather units and dual solar+alternator vehicle hubs. LFP across the rest of the range, though rated cycle life spans 2,500 (EB3A) to 6,000, and it varies WITHIN the Elite range rather than tracking it — the Elite 300 and Elite 200 V2 are rated 6,000 while the Elite 30 V2, Elite 10 Mini, Elite 320 and Elite 400 are rated 3,000+ and the Elite 100 V2 4,000+, so check the specific model. Dual-voltage (120V/240V) in flagships.
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
EcoFlow positions itself as a mid-to-premium brand with stronger support infrastructure, while BLUETTI competes on value. The question is whether the EcoFlow ecosystem and support premium is worth it for your use case.
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.
Apex 300 + B500K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 7,885Wh.
Accepts up to 2,400W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
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
The RIVER 3 is sealed at 245Wh, which is fine if that covers you. The Apex 300 + B500K starts at 7,885Wh and can grow beyond it with BLUETTI expansion batteries — real headroom the RIVER 3 doesn't have if your needs climb toward partial-home backup.
The Bottom Line
The full picture comes down to this. The Apex 300 + B500K edges ahead on our overall analysis, but the margin is narrow enough that your specific use case should drive the decision. Review the scenario verdicts above — if the RIVER 3 wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the RIVER 3 nor the Apex 300 + B500K feels like the right fit, your power needs probably sit outside what these two target. Use our comparison tool above to explore alternatives that better match your specific wattage and runtime requirements. Prices on portable power stations fluctuate frequently. Both EcoFlow and BLUETTI discount regularly, so check the current price before committing. Prime Day and Black Friday pricing typically drops 20-30%.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Apex 300 + B500K worth $3,100 more than the RIVER 3?
The short answer: yes, if you'll actually use the extra capability. The Apex 300 + B500K costs $3,100 more, but that premium buys you 7,639.8Wh more battery capacity (that's 43 extra hours of running a mini-fridge); 3,540W higher AC output (opening the door to more demanding appliances); a longer-lasting battery rated for 6,000 cycles — that's 16 years at daily use; 2,290W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.42/Wh vs $0.81/Wh. Factor in cycle life and the math flips: the Apex 300 + B500K costs $0.07/kWh over its lifetime vs $0.27/kWh. The "expensive" unit is actually cheaper to own. For regular use, we'd pay the premium.
How does the 7,639.8Wh capacity difference actually affect daily use?
The Apex 300 + B500K's 7,884.8Wh battery keeps a mini-fridge running for roughly 45 hours vs the RIVER 3's 1 hours. Where it really matters: during an 8-hour blackout running your fridge, router, lights, AND charging your phone simultaneously (about 1,645Wh total), the Apex 300 + B500K handles it while the RIVER 3 runs dry. What specs don't mention: runtime drops 20-30% in cold weather (below 32°F/0°C) as battery chemistry slows down. The Apex 300 + B500K's extra capacity provides a critical cold-weather buffer. For occasional phone and laptop charging, both are overkill. This gap only matters for sustained, multi-appliance use.
Can I actually carry the Apex 300 + B500K, or is the RIVER 3 the only portable option?
The RIVER 3 at 7.8 lbs is genuinely grab-and-go. Toss it in a backpack, carry it one-handed to a picnic, take it on a boat. The Apex 300 + B500K at 183 lbs is a different story. It's like carrying a large suitcase full of books. If you're setting up and breaking down camp frequently, this weight difference will exhaust you by day two.
How fast can each unit recharge from solar panels in real conditions?
On paper, the Apex 300 + B500K accepts 2,400W vs the RIVER 3's 110W of solar input. What the spec sheet won't tell you: solar panels typically deliver only 60-80% of their rated output due to panel angle, cloud cover, and temperature. In realistic conditions, expect full recharge in about 4.7 hours for the Apex 300 + B500K and 3.2 hours for the RIVER 3. That gap widens on cloudy days, when the Apex 300 + B500K's higher input ceiling captures more of whatever sunlight is available. One more thing: summer gives you ~7 productive solar hours per day. Winter drops to ~4. If solar is your primary recharge method, the Apex 300 + B500K's advantage is substantial.
"6,000 vs 3,000 cycles" — what does that actually mean for me?
In real years: the Apex 300 + B500K (6,000 cycles) lasts 16.4 years at daily use, 58 years at weekend use (twice a week), or 250 years at twice-monthly camping trips. The RIVER 3 (3,000 cycles): 8.2 years daily, 29 years weekends, or 125 years twice-monthly. What most people miss: hitting the cycle limit doesn't kill your battery. Capacity drops to about 80%. Your 7,884.8Wh unit becomes a ~6,308Wh unit. Still very usable. For weekend users, both batteries will outlast the warranty by years.
What if I need more capacity than the RIVER 3's 245Wh later?
The RIVER 3 is sealed at 245Wh, so if you expect your needs to climb, the Apex 300 + B500K is the more future-proof pick: it starts at 7,884.8Wh and adds BLUETTI-compatible batteries without replacing the base unit. That said, "not expandable" isn't a flaw on its own — if 245Wh comfortably covers your loads, the RIVER 3 is a complete unit, not a downgrade.
Is EcoFlow or BLUETTI more reliable for long-term ownership?
Both brands have strengths and trade-offs. EcoFlow: Mixed. 2-5 years depending on model (DELTA Pro Ultra line gets 10 years). Some users report smooth claims; others report runarounds. Register your product to extend coverage. BLUETTI: 2-6 years depending on model (up to 10 years on home backup systems). Response times vary significantly. Some reports of units being deemed unrepairable with no parts available for older models. One piece of advice from the power station community: regardless of brand, buy from Costco or Amazon. Their return policies provide a safety net that manufacturer warranties alone can't match, especially for a product you'll rely on in emergencies. Both brands use LFP (lithium iron phosphate) batteries in their current lineup, the most proven chemistry for longevity and safety.
Bottom line: should I buy the RIVER 3 or the Apex 300 + B500K?
We'd pay the premium for the Apex 300 + B500K. Yes, it costs more. The capability jump is real: you're stepping into a tier that handles appliances the base model can't start. The RIVER 3 is still solid if budget is the priority, but the Apex 300 + B500K will leave you less likely to wish you'd "gone bigger" six months from now. That regret costs more than the price difference.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow RIVER 3
$239.00
$239.00 · direct from EcoFlow
Last checked 13 days ago. Prices move — check before you buy.
BLUETTI Apex 300 + B500KPick
$3,299.00
$3,299.00 · direct from BLUETTI
Last checked 8 hours ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.