Head-to-head test
EcoFlow RIVER 2 Max vs Goal Zero Sherpa 100AC
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Full profiles: EcoFlow RIVER 2 Max → · Goal Zero Sherpa 100AC →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
$289.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
$249.95 · direct from Goal Zero
Last checked 8 hours ago. Prices move — check before you buy.
Spec deltas
The EcoFlow RIVER 2 Max (512Wh) and Goal Zero Sherpa 100AC (95Wh) 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? The RIVER 2 Max has a slight edge, but the margin is close enough that your use case should break the tie.
The RIVER 2 Max holds 417Wh more than the Sherpa 100AC — about 3 hours on a fridge against 1 — a real but modest edge that shows up mainly on longer outages. For camping, tailgating, or keeping devices charged, both have the headroom, so price, weight, and longevity lead the decision instead.
Pick the RIVER 2 Max if your primary use is cpap overnight or afternoon off-grid. Go with the Sherpa 100AC 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 RIVER 2 Max works out to about $0.19/kWh against the Sherpa 100AC's $5.28, a gap that compounds in the RIVER 2 Max'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 2 Max
At 500W, this unit is strictly for personal electronics (phones, laptops) and small CPAP machines. Do not expect to run kitchen appliances. At only 13.4 lbs, it is exceptionally portable. You can easily carry it one-handed to a campsite or tailgating party. A standout feature is the value proposition: at roughly $0.56 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 3,000 charge cycles — much longer battery lifespan
Trade-offs
- –Significantly heavier (+11.3 lbs), making it harder to move.
- –Can receive complaints about fan noise under heavy load.
Goal Zero Sherpa 100AC
At 100W, this unit is strictly for personal electronics (phones, laptops) and small CPAP machines. Do not expect to run kitchen appliances. At only 2.1 lbs, it is exceptionally portable. You can easily carry it one-handed to a campsite or tailgating party.
Strengths
- +Costs $39.1 less
- +Lighter by 11.3 lb
Trade-offs
- –Lacks smartphone app control for remote monitoring.
- –Shorter-lived battery — rated for 500 charge cycles vs the RIVER 2 Max's 3,000, so it wears out sooner.
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 unit covers this scenario's 2,100Wh: the RIVER 2 Max comes up 1,665Wh short (about 21% covered), the Sherpa 100AC 2,020Wh (4%). 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
The Sherpa 100AC can start the 150W peak but not hold it — 150W of surge gets it going, then the 100W continuous rating takes over, so capacity never gets a say. This is the wrong size of unit for the job rather than a close call. The RIVER 2 Max doesn't have the energy either — 435Wh usable against 1,645Wh, 1,210Wh short — so neither route works.
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
RIVER 2 Max
The Sherpa 100AC doesn't finish — 80Wh usable against the 320Wh this needs leaves it 240Wh short, about 25% of the scenario covered. The RIVER 2 Max covers it with 115Wh 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
Neither unit
Neither unit covers this scenario's 910Wh: the RIVER 2 Max comes up 475Wh short (about 48% covered), the Sherpa 100AC 830Wh (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 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
The Sherpa 100AC can't run the 400W peak at all — 150W is the most its inverter will pass even momentarily, so capacity never gets a say. This is the wrong size of unit for the job rather than a close call. The RIVER 2 Max doesn't have the energy either — 435Wh usable against 670Wh, 235Wh short — so neither route works.
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
The Sherpa 100AC can start the 150W peak but not hold it — 150W of surge gets it going, then the 100W continuous rating takes over, so capacity never gets a say. This is the wrong size of unit for the job rather than a close call. The RIVER 2 Max doesn't have the energy either — 435Wh usable against 4,685Wh, 4,250Wh short — so neither route works.
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
RIVER 2 Max
The Sherpa 100AC doesn't finish — 80Wh usable against the 100Wh this needs leaves it 20Wh short, about 81% of the scenario covered. The RIVER 2 Max covers it with 335Wh to spare.
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
Only the RIVER 2 Max can start this 205W load.
$289 list · direct from EcoFlow
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–29hComfort & 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
July 10, 2026
Verdict: the RIVER 2 Max, on Power Score margin
These two units are closely matched on individual specs, but our Power Score analysis gives the RIVER 2 Max the edge with a composite score of 1,979 vs 682.
Overall score margin: 1,979 vs 682 (+190.2%)
List prices as of July 10, 2026. The links below open EcoFlow's and Goal Zero's current prices.
$289.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
or check the Sherpa 100AC price$249.95 list
Written by Wenny Zheng, Portable Power 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): CPAP, Solar Generator, Tailgating, 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 2 Max rates 3.7/5 (26th percentile of 20 Compact-class units), and Sherpa 100AC rates 3.3/5 (1st percentile of 22 Personal-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 Published
62dB is about as loud as a normal conversation. It is EcoFlow's own rating rather than a reading on a shared bench — EcoFlow publishes its RIVER figure as a maximum under heavy load, where most makers publish a best case, so this one is the pessimistic end rather than the optimistic one, so treat it as a starting point rather than what you would hear at a bedside. For most people, fan noise around 45dB and up is where sleep starts to suffer.
Sherpa 100AC: No App Control
Without app control, you have to physically walk to the Sherpa 100AC 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.
Surge Power: Inverter Quality Indicator
The RIVER 2 Max has a 2× surge-to-continuous ratio vs the Sherpa 100AC's 1.5×, and the higher absolute ceiling with it — 1,000W against 150W. At 2× it clears the 2× rule of thumb for absorbing motor startups — fridges, AC compressors and power tools briefly draw 2-3× their rated wattage. What decides whether a given motor starts is the ceiling, not the ratio: the Sherpa 100AC still surges to 150W, so check the startup draw of the heaviest thing you plan to run against that figure rather than assuming it trips.
Only the RIVER 2 Max Lists a UPS Mode
The RIVER 2 Max can sit between the wall and your gear and hand it to battery when the grid drops — rated ≤30ms — a transfer this long is one many desktops will NOT ride through, so plan on reboots for sensitive gear. Worth it for a router, a desktop PC, or a CPAP. The Sherpa 100AC's spec sheet lists no UPS mode, so anything plugged into it rides an outage only as far as your reaction time.
Warranty: 5 Years vs 2
The RIVER 2 Max is covered for 5 years against the Sherpa 100AC's 2 years. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The RIVER 2 Max is rated for 3,000 cycles vs 500. In real life: at daily use, that's 8.2 vs 1.4 years. At weekend use (twice a week), it's 29 vs 5 years. One caution reading years across different sizes: a cycle is 512Wh on the RIVER 2 Max and 95Wh on the Sherpa 100AC, so count lifetime energy — roughly 1,536 kWh against 47 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.
Sherpa 100AC: Noise Level Not Disclosed
The RIVER 2 Max publishes its noise level (62dB); the Sherpa 100AC doesn't publish one. That isn't evidence the Sherpa 100AC is louder — it means there's no figure to hold it to, and no way to compare the two on this without hearing them. If you're buying for a bedroom, a CPAP, or an apartment, treat the RIVER 2 Max's 62dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the Sherpa 100AC before deciding.
Full record above — the Test Desk pick is the RIVER 2 Max.
Check RIVER 2 Max price →or check the Sherpa 100AC 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 Sherpa 100AC is cheaper to buy, but the RIVER 2 Max is cheaper to own. At $0.19/kWh over its lifetime vs $5.28/kWh, the RIVER 2 Max's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $5.09 less — check the RIVER 2 Max 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.
Goal Zero
Ecosystem
Focused — a compact current line (6th-gen Yeti and Yeti Pro series), the previous-gen X series now out of stock across every model on Goal Zero's own store (checked 2026-09-13: 200X, 500X, 1000X, 1500X, 3000X, 6000X, some listed only as open-box), so buying one new means finding retailer stock, Sherpa power banks for the under-100Wh tier, plus Alta coolers, Nomad/Ranger solar panels, and vehicle integration kits
Support
US-based company (Salt Lake City, owned by NRG Energy). Historically considered premium support, but 2025-2026 reports describe long wait times, unresponsive email communication, and tickets going unaddressed for weeks. The "premium support justifies premium pricing" argument is weakening.
Community
Small but loyal — strong following in overlanding and preparedness communities. Official community forums were recently shuttered, frustrating long-time users.
App experience
Rated 4.4/5 iOS (~1,200 ratings) but recent reviews skew negative — recurring connectivity issues, crashes, and stability problems.
Unique strength
Pioneer of the portable power market — strongest brand heritage. US-based company with ruggedized, weather-resistant designs (IP ratings vary by model). Integrated "Yeti-Ready" ecosystem with coolers, lights, and vehicle kits.
Worth knowing
Typically the priciest brand per watt-hour — though individual pairings vary, and on some pages the Yeti is the cheaper energy. Support quality has declined from its "premium" standard. Perceived as competitively stagnant vs. faster-innovating Chinese competitors. Reliability reports on newer models are concerning.
Analyst note
EcoFlow and Goal Zero are close competitors. Both have established support channels and growing ecosystems. Compare their specific warranty terms and community size for your peace of mind.
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.
Sherpa 100AC
FIXED CAPACITYFixed at 95Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 60W of solar. Limited to a single portable panel.
Limited ports. You'll likely need a power strip or splitter.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Neither expands, and that's no knock on either — each is a complete unit at a fixed size. Buy the capacity that covers your needs now (the RIVER 2 Max gives you the larger ceiling); you can't add to either later.
The Bottom Line
The full picture comes down to this. The RIVER 2 Max 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 Sherpa 100AC wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the RIVER 2 Max nor the Sherpa 100AC feels like the right fit, your power needs probably sit outside what these two target. If you're planning whole-home backup or running power-hungry appliances (electric heaters, window AC), you'll want a larger system in the 3,000–5,000Wh range with expansion battery support. Prices on portable power stations fluctuate frequently. Both EcoFlow and Goal Zero 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.
Can I actually carry the RIVER 2 Max, or is the Sherpa 100AC the only portable option?
The Sherpa 100AC at 2.1 lbs is genuinely grab-and-go. Toss it in a backpack, carry it one-handed to a picnic, take it on a boat. The RIVER 2 Max at 13.4 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.
"3,000 vs 500 cycles" — what does that actually mean for me?
In real years: the RIVER 2 Max (3,000 cycles) lasts 8.2 years at daily use, 29 years at weekend use (twice a week), or 125 years at twice-monthly camping trips. The Sherpa 100AC (500 cycles): 1.4 years daily, 5 years weekends, or 21 years twice-monthly. What most people miss: hitting the cycle limit doesn't kill your battery. Capacity drops to about 80%. Your 512Wh unit becomes a ~410Wh unit. Still very usable. For weekend users, both batteries will outlast the warranty by years.
Can I use the RIVER 2 Max as a home UPS to protect my electronics during blackouts?
Yes. The RIVER 2 Max has UPS mode with true 0ms switchover (double-conversion). Even hospital-grade equipment won't notice. Plug in your desktop PC, router, NAS, or CPAP machine and it switches to battery seamlessly when the grid drops. The Sherpa 100AC does not have this feature. Without UPS, a blackout means: your PC reboots (potentially corrupting unsaved work), your NAS may corrupt its drive array, your CPAP alarms and wakes you up, and your security cameras go dark until you manually switch them over. If always-on power protection matters, this is a dealbreaker advantage for the RIVER 2 Max.
Is EcoFlow or Goal Zero 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. Goal Zero: 5 years on LFP models, 2 years on older NMC models. Battery must be charged within 7 days of purchase and every 6 months to maintain warranty (strict). Product reliability concerns have increased — repeat "Battery Fault" errors reported even on newer Yeti Pro 4000. 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 2 Max or the Sherpa 100AC?
We'd pay the premium for the RIVER 2 Max. 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 Sherpa 100AC is still solid if budget is the priority, but the RIVER 2 Max will leave you less likely to wish you'd "gone bigger" six months from now. That regret costs more than the price difference.
Where to buy
EcoFlow RIVER 2 MaxPick
$289.00
$289.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
Goal Zero Sherpa 100AC
$249.95
$249.95 · direct from Goal Zero
Last checked 8 hours ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.