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).
In short. 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 leads on rated cycle life (4,000 vs 3,000). 3 of 6 measures tie or are not comparable.
Check the current price
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 |
|---|---|---|
| Rated capacity | 1,056 Wh ✓ | 1,024 Wh |
| Usable capacity (calculated)* | 898–950 Wh | 870–922 Wh |
| Continuous AC output | 1,800 W | 1,800 W |
| Surge output | No conventional surge stated (2,400 W boost mode)1 | 3,600 W |
| Full recharge from wall | <60 min2 | 56 min3 |
| Cell chemistry | LiFePO4 | LiFePO4 |
| Rated cycle life | 3,000 cycles to 80% | 4,000 cycles to 80%+ ✓ |
| UPS switchover | <20 ms4 | <10 ms5 |
| Expandable | Yes, up to 2,112 Wh6 | Yes, up to 5,000 Wh |
| Max solar input | 600 W ✓ | 500 W |
| Max AC charging input | 1,300 W | 1,500 W ✓ |
| AC outlets | 6 | 6 |
| Highest USB-C port | 100 W7 | 100 W |
| App control | Yes | Yes |
| Stated noise | Manufacturer does not state | <30 dB8 |
| Warranty | 5 years | 5 years |
| Weight | 28.44 lb | about 27.6 lb9 |
| Manufacturer list price when checked | $449.9910 ✓ | $69911 |
* Calculated: rated capacity × an assumed 85–90% conversion efficiency; no maker publishes a usable figure.
Notes on the figures
- 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.
- C1000, full recharge: Stated as ‘a full charge in under an hour’; 60 minutes is the upper bound, not a precise figure.
- DELTA 3, full recharge: With the 1,500 W AC input setting.
- C1000, UPS switchover: Stated as under 20 ms; the manufacturer gives an upper bound, not a measured figure.
- DELTA 3, UPS switchover: Stated as under 10 ms; an upper bound.
- 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.
- C1000, USB-C: Two USB-C ports; highest single port is 100W.
- 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.
- DELTA 3, weight: Manufacturer states ‘approx.’
- C1000, price: Manufacturer list price when checked; a $20 code brought it to $429.99 that day.
- 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.
| Measure | C1000 | DELTA 3 |
|---|---|---|
| Cost per watt-hour | $0.43/Wh ✓ | $0.68/Wh |
| Watt-hours per pound | 37.1 Wh/lb | 37.1 Wh/lb |
| Surge headroom | Not comparable — the C1000 figure is a boost-mode rating, not a motor-start surge. | |
| Recharge rate | ≥17.6 Wh/min | 18.3 Wh/min |
| Rated cycle life | 3,000 | 4,000 ✓ |
| Continuous watts per dollar | 4.00 W/$ ✓ | 2.58 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 |
|---|---|---|
| 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 $0.68/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.
Check the current price
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. 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
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.