Head-to-head test
EcoFlow DELTA 3 Plus vs Anker SOLIX C300
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
EcoFlow
DELTA 3 Plus
3,225Power Score · Appliance Class
$689.00 list · direct from EcoFlow
Anker
SOLIX C300
1,664Power Score · Device Hub
$299.99 list · direct from Anker
Spec deltas
The EcoFlow DELTA 3 Plus (1,024Wh) and Anker SOLIX C300 (288Wh) 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 DELTA 3 Plus has a slight edge, but the margin is close enough that your use case should break the tie.
What the spec gap means in practice: the DELTA 3 Plus's 1,800W inverter has the headroom for a window AC, a full-size fridge, and power tools. The SOLIX C300's 300W inverter can't start the heaviest of those — a window AC or a high-surge power tool will trip it. On stamina, the DELTA 3 Plus keeps a fridge alive for roughly 6 hours vs the SOLIX C300's 2 hours.
Pick the DELTA 3 Plus if your primary use is cpap overnight or tailgate party. Go with the SOLIX C300 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 DELTA 3 Plus works out to about $0.17/kWh against the SOLIX C300's $0.35, a gap that compounds in the DELTA 3 Plus'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 DELTA 3 Plus
The 1,800W inverter handles most daily devices like laptops, blenders, and TVs, but will struggle with heating elements that require over 1500W.
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$389) than the SOLIX C300.
- –Significantly heavier (+17.9 lbs), making it harder to move.
Anker SOLIX C300
At 300W, this unit is strictly for personal electronics (phones, laptops) and small CPAP machines. Do not expect to run kitchen appliances. At only 9.1 lbs, it is exceptionally portable. You can easily carry it one-handed to a campsite or tailgating party.
Strengths
- +Costs $389 less
- +Lighter by 17.9 lb
Trade-offs
- –Weaker inverter (-1,500W) limits appliance compatibility.
- –Sealed capacity — the DELTA 3 Plus can add batteries to grow past 288Wh; this one can't.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA 3 Plus's 4,000, 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 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 can fully handle this scenario (needs 2,100Wh). You'd need a higher-capacity station or to cut back on usage.
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 unit can fully handle this scenario (needs 1,645Wh). You'd need a higher-capacity station or to cut back on usage.
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
DELTA 3 Plus
The SOLIX C300 runs out of juice. It only has 245Wh usable, but this scenario needs 320Wh. The DELTA 3 Plus covers it and still has 37h of phone charging left over.
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 can fully handle this scenario (needs 910Wh). You'd need a higher-capacity station or to cut back on usage.
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
DELTA 3 Plus
The SOLIX C300's 300W output can't handle the 400W peak demand. The DELTA 3 Plus handles this scenario with 200Wh to spare.
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 can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
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 six 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: DELTA 3 Plus runs 4.2h vs 1.2h.
$689 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 0–58hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–11.6hHigh-Draw Appliances
These reveal the real limitsscale 0–0.9h¹ 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 DELTA 3 Plus, on Power Score margin
These two units are closely matched on individual specs, but our Power Score analysis gives the DELTA 3 Plus the edge with a composite score of 3,225 vs 1,664.
Overall score margin: 3,225 vs 1,664 (+93.8%)
List prices as of July 10, 2026. The links below open EcoFlow's and Anker's current prices.
$689.00 list · direct from EcoFlow
or check the SOLIX C300 price$299.99 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): RV Living, Home Backup, Solar Generator, Food Truck.
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, DELTA 3 Plus rates 4.4/5 (65th percentile of 24 Everyday-class units), and SOLIX C300 rates 4.4/5 (67th 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.
SOLIX C300: Fixed Capacity
The SOLIX C300 is sealed at 288Wh — fine if that covers you, but it's the ceiling. The DELTA 3 Plus starts at 1,024Wh and can add expansion batteries, so if your needs may climb toward partial-home backup, it has room to grow the SOLIX C300 doesn't.
Warranty Value Comparison
The SOLIX C300 gives you 16.7 years of warranty per $1,000 spent, vs the DELTA 3 Plus's 7.3 years. That's 2.3× more coverage per dollar. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The DELTA 3 Plus is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. After hitting the cycle limit, the battery doesn't die. It drops to ~80% original capacity, which is still very usable.
Full record above — the Test Desk pick is the DELTA 3 Plus.
Check DELTA 3 Plus price →or check the SOLIX C300 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 SOLIX C300 is cheaper to buy, but the DELTA 3 Plus is cheaper to own. At $0.17/kWh over its lifetime vs $0.35/kWh, the DELTA 3 Plus's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $0.18 less — check the DELTA 3 Plus 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. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also 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
DELTA 3 Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 1,000W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
SOLIX C300
FIXED CAPACITYFixed at 288Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 100W 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
The SOLIX C300 is sealed at 288Wh, which is fine if that covers you. The DELTA 3 Plus starts at 1,024Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the SOLIX C300 doesn't have if your needs climb toward partial-home backup.
The Bottom Line
The full picture comes down to this. The DELTA 3 Plus 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 SOLIX C300 wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the DELTA 3 Plus nor the SOLIX C300 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 Anker 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 DELTA 3 Plus worth $389 more than the SOLIX C300?
The short answer: yes, if you'll actually use the extra capability. The DELTA 3 Plus costs $389 more, but that premium buys you 736Wh more battery capacity (that's 4 extra hours of running a mini-fridge); 1,500W higher AC output (opening the door to more demanding appliances); a longer-lasting battery rated for 4,000 cycles — that's 11 years at daily use; 900W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.67/Wh vs $1.04/Wh. Factor in cycle life and the math flips: the DELTA 3 Plus costs $0.17/kWh over its lifetime vs $0.35/kWh. The "expensive" unit is actually cheaper to own. For regular use, we'd pay the premium.
How does the 736Wh capacity difference actually affect daily use?
The DELTA 3 Plus's 1,024Wh battery keeps a mini-fridge running for roughly 6 hours vs the SOLIX C300's 2 hours. What specs don't mention: runtime drops 20-30% in cold weather (below 32°F/0°C) as battery chemistry slows down. The DELTA 3 Plus'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 DELTA 3 Plus, or is the SOLIX C300 the only portable option?
The SOLIX C300 at 9.1 lbs is genuinely grab-and-go. Toss it in a backpack, carry it one-handed to a picnic, take it on a boat. The DELTA 3 Plus at 27 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 DELTA 3 Plus accepts 1,000W vs the SOLIX C300's 100W 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 1.5 hours for the DELTA 3 Plus and 4.1 hours for the SOLIX C300. That gap widens on cloudy days, when the DELTA 3 Plus'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 DELTA 3 Plus's advantage is substantial.
"4,000 vs 3,000 cycles" — what does that actually mean for me?
In real years: the DELTA 3 Plus (4,000 cycles) lasts 11.0 years at daily use, 38 years at weekend use (twice a week), or 167 years at twice-monthly camping trips. The SOLIX C300 (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 1,024Wh unit becomes a ~819Wh unit. Still very usable. For weekend users, both batteries will outlast the warranty by years.
What if I need more capacity than the SOLIX C300's 288Wh later?
The SOLIX C300 is sealed at 288Wh, so if you expect your needs to climb, the DELTA 3 Plus is the more future-proof pick: it starts at 1,024Wh and adds EcoFlow-compatible batteries without replacing the base unit. That said, "not expandable" isn't a flaw on its own — if 288Wh comfortably covers your loads, the SOLIX C300 is a complete unit, not a downgrade.
Is EcoFlow or Anker 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. Anker: 5-year warranty standard on portable stations, 10-year on home energy systems. Historically very reliable, though some recent firmware updates have altered product functionality without notice or rollback option. 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 DELTA 3 Plus or the SOLIX C300?
We'd pay the premium for the DELTA 3 Plus. 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 SOLIX C300 is still solid if budget is the priority, but the DELTA 3 Plus 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 DELTA 3 PlusPick
$689.00
$689.00 list · direct from EcoFlow
Anker SOLIX C300
$299.99
$299.99 list · direct from Anker
Prices may vary by retailer and are subject to change.