Anker SOLIX C1000 vs EcoFlow DELTA 3 Plus: manufacturer-published specifications compared

Anker SOLIX C1000 vs EcoFlow DELTA 3 Plus: cheaper per watt-hour vs longer cycle rating

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Specifications checked against manufacturer pages on 2026-08-23.

The Anker SOLIX C1000 (1,056 Wh, 1,800 W) and the EcoFlow DELTA 3 Plus (1,024 Wh, 1,800 W), compared on the figures their makers publish. On the normalized ratios, the C1000 costs less per watt-hour ($0.43/Wh vs $0.78/Wh); the DELTA 3 Plus is rated for more cycles (4,000 vs 3,000).

In short. The C1000 leads on cost per watt-hour ($0.43/Wh vs $0.78/Wh) and continuous watts per dollar (4.00 W/$ vs 2.25 W/$). The DELTA 3 Plus leads on rated cycle life (4,000 vs 3,000). 3 of 6 measures tie or are not comparable.

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Check the current price

Anker SOLIX C1000Anker SOLIX C1000 on Amazon
EcoFlow DELTA 3 PlusEcoFlow DELTA 3 Plus on Amazon

Links go to the exact base unit we compared, not a bundle. Amazon prices change daily.

Specifications, side by side

Numbered notes below the table give the source location or a caveat for figures that need one; check marks mark the better figure where one can be judged; “Manufacturer does not state” means absent from that maker’s page as of its check date listed under Sources. UPS switchover is how long the outlets go dark when grid power drops.

Specification Anker SOLIX C1000 EcoFlow DELTA 3 Plus
Rated capacity 1,056 Wh1 ✓ 1,024 Wh2
Usable capacity (calculated)* 898–950 Wh 870–922 Wh
Continuous AC output 1,800 W3 1,800 W4
Surge output No conventional surge stated (2,400 W boost mode)5 3,600 W6
Full recharge from wall <60 min7 56 min8
Cell chemistry LiFePO49 LiFePO410
Rated cycle life 3,000 cycles to 80%11 4,000 cycles to 80%12 ✓
UPS switchover <20 ms13 <10 ms14
Expandable Yes, up to 2,112 Wh15,16 Yes, up to 5,000 Wh17
Max solar input 600 W18 1,000 W19 ✓
Max AC charging input 1,300 W20 1,500 W21 ✓
AC outlets 622 623
Highest USB-C port 100 W24 140 W25 ✓
App control Yes26 Yes27
Stated noise Manufacturer does not state <30 dB28
Warranty 5 years29 5 years30
Weight 28.44 lb31 about 27.6 lb32
Manufacturer list price when checked $449.9933 ✓ $79934

* Calculated: rated capacity × an assumed 85–90% conversion efficiency; no maker publishes a usable figure.

Notes on the figures

  1. C1000, rated capacity: 1056Wh
  2. DELTA 3 Plus, rated capacity: 1024Wh
  3. C1000, continuous output: 1800W Pure Sine Wave
  4. DELTA 3 Plus, continuous output: 1800W
  5. C1000, surge: Anker labels 2,400 W as ‘SurgePad’, a mode that raises output for resistive loads such as heaters. It is not a conventional motor-start surge rating and should not be read as one.
  6. DELTA 3 Plus, surge: EcoFlow’s X-Boost raises sustained output to 2,200 W for resistive loads; 3,600 W is the surge figure. The two are different things.
  7. C1000, full recharge: Stated as ‘a full charge in under an hour’; 60 minutes is the upper bound, not a precise figure.
  8. DELTA 3 Plus, full recharge: With the 1,500 W AC input setting.
  9. C1000, cell chemistry: LiFePO4 (Lithium Iron Phosphate)
  10. DELTA 3 Plus, cell chemistry: Third-gen LiFePO4 (LFP) cells offer fast charging without sacrificing longevity.
  11. C1000, cycle life: 3,000 (80% Capacity)
  12. DELTA 3 Plus, cycle life: With 4000 cycles to 80% capacity, enjoy up to 10 years of reliable use, 25% above the industry standard.
  13. C1000, UPS switchover: Stated as under 20 ms; the manufacturer gives an upper bound, not a measured figure.
  14. DELTA 3 Plus, UPS switchover: Stated as under 10 ms; an upper bound.
  15. C1000, expandable: Up to Max. 2112Wh Capacity with Expansion Battery (Coming soon.)
  16. C1000, expandable: The expansion battery was marked ‘coming soon’ on the product page when checked; confirm it is actually on sale before counting on it.
  17. DELTA 3 Plus, expandable: up to 5kWh expandable
  18. C1000, solar input: Solar Input Recharge: 600W Max, 11-60V MPPT
  19. DELTA 3 Plus, solar input: 2 ports, DC Charge Input, 11V-60V 500W Max*2
  20. C1000, AC input: AC Input Recharge: 1,300W Max
  21. DELTA 3 Plus, AC input: 1500W
  22. C1000, AC outlets: AC Outlets: 6×
  23. DELTA 3 Plus, AC outlets: 6 outlets, 1800W total (Surge 3600W)
  24. C1000, USB-C: Two USB-C ports; highest single port is 100W.
  25. DELTA 3 Plus, USB-C: 2 ports, 140W Max
  26. C1000, app: Wireless Connection for App: Wi-Fi and Bluetooth
  27. DELTA 3 Plus, app: APP (TOU / Storm Warning Alert)
  28. DELTA 3 Plus, noise: Stated as under 30 dB at 600 W output and under 40 dB at 1,200 W; an upper bound at a stated load.
  29. C1000, warranty: Warranty: 5-Year Warranty
  30. DELTA 3 Plus, warranty: 5 years
  31. C1000, weight: Net Weight: 28.44 lb / 12.9 kg
  32. DELTA 3 Plus, weight: Manufacturer states ‘approx.’
  33. C1000, price: Manufacturer list price when checked; a $20 code brought it to $429.99 that day.
  34. DELTA 3 Plus, price: Manufacturer list price when checked; on sale at $669 that day.

The same specs, normalized

Ratios, so the bigger unit does not win by default.

Measure C1000 DELTA 3 Plus
Cost per watt-hour $0.43/Wh ✓ $0.78/Wh
Watt-hours per pound 37.1 Wh/lb 37.1 Wh/lb
Surge headroom Not comparable — the C1000 figure is a boost-mode rating, not a motor-start surge.
Recharge rate ≥17.6 Wh/min 18.3 Wh/min
Rated cycle life 3,000 4,000 ✓
Continuous watts per dollar 4.00 W/$ ✓ 2.25 W/$

Definitions and direction of each ratio: How we verify. A recharge rate marked ≥ is computed from an upper-bound recharge time, so the true rate is at least that figure; no check mark on that row.

What each one runs, for how long

Appliance C1000 DELTA 3 Plus
Full-size refrigerator
150 W, 900 W start, 35% duty · eff. 80%–87%		 16–17 hr 16–17 hr
Mini fridge
70 W, 400 W start, 30% duty · eff. 70%–82%		 35–41 hr 34–40 hr
CPAP without humidifier
40 W · eff. 70%–82%		 18–22 hr 18–21 hr
CPAP with heated humidifier
95 W · eff. 80%–87%		 8.9–9.7 hr 8.6–9.4 hr
Gas furnace blower
400 W, 1600 W start, 40% duty · eff. 85%–90%		 5.6–5.9 hr 5.4–5.8 hr
1/3 hp sump pump
500 W, 1800 W start, 15% duty · eff. 85%–90%		 12–13 hr (start-up not assessed) about 12 hr
Router and modem
20 W · eff. 70%–82%		 37–43 hr 36–42 hr
Laptop
60 W · eff. 70%–82%		 12–14 hr 12–14 hr
1500W space heater
1500 W · eff. 82%–88%		 about 0.6 hr about 0.6 hr

Calculated, not measured: hours = rated Wh × efficiency ÷ (appliance W × duty); assumptions on How we verify. “Unlikely to start”: start-up surge exceeds the stated surge rating. “Start-up not assessed” appears where the start-up draw meets or exceeds the unit’s continuous rating and the unit states no conventional motor-start surge to check it against (C1000); the hours assume the motor starts.

What the differences mean

Price per watt-hour. At the list prices we checked, the C1000 costs $0.43/Wh against $0.78/Wh for the DELTA 3 Plus. At list the C1000 is $349.01 cheaper ($449.99 vs $799) for 1,056 Wh vs 1,024 Wh. Prices move with sales; the ratio moves with them.

Cycle rating. The DELTA 3 Plus is rated for 4,000 cycles against 3,000 for the C1000, both to the same remaining-capacity threshold — otherwise we would not compare them. At one full cycle a week the difference is measured in years, not months; at occasional outage use neither limit is reached.

Output for the money. 4.00 W/$ on the C1000 against 2.25 W/$ on the DELTA 3 Plus: if what you need is to run a high-draw appliance rather than to run a small one for days, this ratio is the one to read.

Which one, and for whom

On normalized measures the C1000 leads on cost per watt-hour ($0.43/Wh vs $0.78/Wh) and continuous watts per dollar (4.00 W/$ vs 2.25 W/$). The DELTA 3 Plus answers on rated cycle life (4,000 vs 3,000). What decides it is the figure your outage actually tests:

  • CPAP overnight. Switchover: C1000 under 20 ms, DELTA 3 Plus under 10 ms. A 40 W CPAP runs roughly 18–22 hr on the C1000 and 18–21 hr on the DELTA 3 Plus. Both run the night; both switchover figures are upper bounds, so they are too close to call from published numbers.
  • Keeping a refrigerator cold. Start-up comes first. The C1000 states a boost figure rather than a motor-start surge rating; the DELTA 3 Plus states a 3,600 W surge rating. A full-size refrigerator needs about 900 W to start.
  • A multi-day outage with a generator or solar to recharge from. Full recharge: C1000 under 60 min, DELTA 3 Plus 56 min. The C1000 figure is an upper bound, not a measured time, so the two cannot be ranked from published numbers.

Check the current price

Anker SOLIX C1000Anker SOLIX C1000 on Amazon
EcoFlow DELTA 3 PlusEcoFlow DELTA 3 Plus on Amazon

Links go to the exact base unit we compared, not a bundle. Amazon prices change daily.

Related reading

A 1,024–1,056 Wh battery cannot do what a gasoline generator does — the runtime table shows a 1,500 W space heater emptying either unit in about 0.6 hr — but it also cannot poison a household. Our CPSC revision matrix tracks how the official count of generator carbon-monoxide deaths has changed across report editions, and this page puts every verified unit on the same refrigerator scenario.

Ordering before a storm? Check the arrival date at checkout — a unit that ships tomorrow can beat a better one that ships next week. Amazon Prime includes fast delivery on eligible items and starts with a free trial; we earn a commission if you join.

Sources and method

Published specifications only; no bench tests. Method: How we verify. More: Comparisons.