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

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

The Anker SOLIX C1000 (1,056 Wh, 1,800 W) and the EcoFlow DELTA 3 (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 $0.68/Wh); the DELTA 3 is rated for more cycles (4,000 vs 3,000).

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.

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

Notes on the figures

1. 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.
2. C1000, full recharge: Stated as ‘a full charge in under an hour’; 60 minutes is the upper bound, not a precise figure.
3. DELTA 3, full recharge: With the 1,500 W AC input setting.
4. C1000, UPS switchover: Stated as under 20 ms; the manufacturer gives an upper bound, not a measured figure.
5. DELTA 3, UPS switchover: Stated as under 10 ms; an upper bound.
6. 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.
7. C1000, USB-C: Two USB-C ports; highest single port is 100W.
8. DELTA 3, 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.
9. DELTA 3, weight: Manufacturer states ‘approx.’
10. C1000, price: Manufacturer list price when checked; a $20 code brought it to $429.99 that day.
11. DELTA 3, price: Manufacturer list price when checked; on sale at $569 that day.

The same specs, normalized

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

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

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 $0.68/Wh for the DELTA 3. At list the C1000 is $249.01 cheaper ($449.99 vs $699) for 1,056 Wh vs 1,024 Wh. Prices move with sales; the ratio moves with them.

Cycle rating. The DELTA 3 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 2.58 W/$ on the DELTA 3: this is the ratio to read if your outage plan is one big appliance, not many small ones.

Which one, and for whom

On normalized measures the C1000 leads on cost per watt-hour ($0.43/Wh vs $0.68/Wh) and continuous watts per dollar (4.00 W/$ vs 2.58 W/$). The DELTA 3 answers on rated cycle life (4,000 vs 3,000). The deciding figure is the one your own outage will test first:

• CPAP overnight. Switchover: C1000 under 20 ms, DELTA 3 under 10 ms. A 40 W CPAP runs roughly 18–22 hr on the C1000 and 18–21 hr on the DELTA 3. Both run the night; both switchover figures are upper bounds, so they are too close to call from published numbers.
• Keeping a refrigerator cold. The compressor has to start before hours matter. The C1000 states a boost figure rather than a motor-start surge rating; the DELTA 3 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 56 min. The C1000 figure is an upper bound, not a measured time, so the two cannot be ranked from published numbers.

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. How often gasoline generators kill indoors — and how the official count keeps being revised — is documented in our CPSC revision matrix, and this page puts every verified unit on the same refrigerator scenario.

Other comparisons with these models

• EcoFlow DELTA 3 vs EcoFlow DELTA 3 Plus
• EcoFlow DELTA 3 vs Jackery Explorer 1000 v2
• Anker SOLIX C1000 vs Bluetti AC180
• EcoFlow DELTA 2 vs EcoFlow DELTA 3
• Anker SOLIX C1000 vs EcoFlow DELTA 2
• Anker SOLIX C1000 vs Jackery Explorer 1000 v2

Sources and method

• Anker SOLIX C1000: manufacturer product page, checked 2026-08-23.
• EcoFlow DELTA 3: manufacturer product page, checked 2026-08-23.

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