Specifications checked against manufacturer pages on 2026-08-23.
The Anker SOLIX C1000 (1,056 Wh, 1,800 W) and the EcoFlow DELTA 2 (1,024 Wh, 1,800 W), compared on the figures their makers publish. On the normalized ratios the two tie or cannot be compared; the differences are in the rows the makers leave unstated and in the runtime table.
In short. On every normalized measure that could be decided, the C1000 and DELTA 2 tie or cannot be compared (6 of 6 rows). The published figures do not separate them; the differences are in what the tables cannot show — see the notes, the runtime table and the sources.
Check the current price
Links go to the exact base unit we compared, not a bundle. Amazon prices change daily.
Catalog status, checked 2026-08-23. The EcoFlow DELTA 2’s store listing on the manufacturer’s site now redirects to a newer model, and the unit no longer appears in the manufacturer’s product-series catalog. It has been superseded by the EcoFlow DELTA 3. Its marketing page, with the spec tab we read the figures from, was still online when checked. Retailers may still sell remaining stock. That changes the question from “which is better” to “is a lower price worth buying a model the maker has moved on from” — see Buying a superseded model below.
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 2 |
|---|---|---|
| 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 | 2,700 W6 |
| Full recharge from wall | <60 min7 | 80 min8 |
| Cell chemistry | LiFePO49 | LiFePO410 |
| Rated cycle life | 3,000 cycles to 80%11 | 3,000+ cycles to 80%12,13 |
| UPS switchover | <20 ms14 | 30 ms15 |
| Expandable | Yes, up to 2,112 Wh16,17 | Yes, up to 3,000 Wh18,19 |
| Max solar input | 600 W20 ✓ | 500 W21 |
| Max AC charging input | 1,300 W22 ✓ | 1,200 W23 |
| AC outlets | 624 | 625 |
| Highest USB-C port | 100 W26 | 100 W27 |
| App control | Yes28 | Yes29 |
| Stated noise | Manufacturer does not state | <60 dB30 |
| Warranty | 5 years31 | 5 years32 |
| Weight | 28.44 lb33 | about 27 lb34 ✓ |
| Manufacturer list price when checked | $449.9935 | Manufacturer does not state |
* Calculated: rated capacity × an assumed 85–90% conversion efficiency; no maker publishes a usable figure.
Notes on the figures
- C1000, rated capacity: 1056Wh
- DELTA 2, rated capacity: Capacity 1024 Wh
- C1000, continuous output: 1800W Pure Sine Wave
- DELTA 2, continuous output: 1800W output
- 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.
- DELTA 2, surge: From the Output section of EcoFlow’s spec tab.
- C1000, full recharge: Stated as ‘a full charge in under an hour’; 60 minutes is the upper bound, not a precise figure.
- DELTA 2, full recharge: Stated as 0–100%.
- C1000, cell chemistry: LiFePO4 (Lithium Iron Phosphate)
- DELTA 2, cell chemistry: Battery Chemistry LFP (LiFePO4)
- C1000, cycle life: 3,000 (80% Capacity)
- DELTA 2, cycle life: EcoFlow’s DELTA 2 page gives two different figures: ‘3000+’ cycles in the description and ‘4000 cycles to 80%+’ in the spec tab. We use the lower one.
- DELTA 2, cycle life: 80% of its original capacity
- C1000, UPS switchover: Stated as under 20 ms; the manufacturer gives an upper bound, not a measured figure.
- DELTA 2, UPS switchover: UPS 30ms, EPS
- C1000, expandable: Up to Max. 2112Wh Capacity with Expansion Battery (Coming soon.)
- 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.
- DELTA 2, expandable: Extra Battery ✓
- DELTA 2, expandable: 3 kWh with two extra batteries; 2,048 Wh with one.
- C1000, solar input: Solar Input Recharge: 600W Max, 11-60V MPPT
- DELTA 2, solar input: Delta 2 can work with one 400W solar panel, or two 220W solar panels used in series, and the maximum solar charging power is 500W.
- C1000, AC input: AC Input Recharge: 1,300W Max
- DELTA 2, AC input: AC Charging X-Stream Fast Charging 1200W max.
- C1000, AC outlets: AC Outlets: 6×
- DELTA 2, AC outlets: Product page Specs tab, ‘Output’ section.
- C1000, USB-C: Two USB-C ports; highest single port is 100W.
- DELTA 2, USB-C: Not stated as text on the product page (Specs tab only says ‘Number of USB-C Output 2’; the Specs-tab product image shows the printed port label ‘USB-C 100W’).
- C1000, app: Wireless Connection for App: Wi-Fi and Bluetooth
- DELTA 2, app: Product page FAQ (‘What connection methods do the APP support?’).
- DELTA 2, noise: Product page Specs tab.
- C1000, warranty: Warranty: 5-Year Warranty
- DELTA 2, warranty: Product page Specs tab.
- C1000, weight: Net Weight: 28.44 lb / 12.9 kg
- DELTA 2, weight: Manufacturer states ‘approx.’
- C1000, price: Manufacturer list price when checked; a $20 code brought it to $429.99 that day.
The same specs, normalized
Ratios, so the bigger unit does not win by default.
| Measure | C1000 | DELTA 2 |
|---|---|---|
| Cost per watt-hour | Not comparable — EcoFlow does not state a price for the DELTA 2. | |
| Watt-hours per pound | 37.1 Wh/lb (within 3%) | 37.9 Wh/lb (within 3%) |
| Surge headroom | Not comparable — the C1000 figure is a boost-mode rating, not a motor-start surge. | |
| Recharge rate | ≥17.6 Wh/min | 12.8 Wh/min |
| Rated cycle life | 3,000 | 3,000 |
| Continuous watts per dollar | Not comparable — EcoFlow does not state a price for the DELTA 2. | |
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 2 |
|---|---|---|
| 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.
Which one, and for whom
No normalized measure separates the two: every row either ties on the published figures or cannot be compared. The decision rests on price, ports, software and the notes above, not on the ratios. What decides it is the figure your outage actually tests:
- CPAP overnight. Switchover: C1000 under 20 ms, DELTA 2 30 ms. A 40 W CPAP runs roughly 18–22 hr on the C1000 and 18–21 hr on the DELTA 2. Both run the night; on published figures the C1000 switches at least as fast (under 20 ms vs 30 ms).
- Keeping a refrigerator cold. Start-up comes first. The C1000 states a boost figure rather than a motor-start surge rating; the DELTA 2 states a 2,700 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 2 80 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.
Buying a superseded model: what actually changes
Nothing in the table above changes because a model leaves the catalog. The cells, the inverter and the cycle rating are what they were. Three things do change.
- Price, and therefore cost per watt-hour. A superseded unit is only a bargain if its lower price beats the successor on cost per watt-hour and the successor’s advantages are ones you will not use. Compare against the successor’s figures (see our C1000 and successor comparisons on the Comparisons page). If the successor’s surge or UPS figure is the one your outage tests, the discount is buying you the wrong unit cheaply.
- Warranty and support. The manufacturer states a 5-year warranty for the DELTA 2. Check with the retailer that the term runs from your purchase date, not the model’s launch date. How long firmware and app support continue for a retired model is not something we could verify from the manufacturer’s pages; if the app matters to you, ask before buying.
- Expansion batteries. If you expect to add capacity later, confirm the matching expansion battery is still sold. Successor batteries are not always backward-compatible.
Our rule: compare the discounted price against the successor on cost per watt-hour first. If the superseded unit does not win there, the rest does not matter.
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.
Other comparisons with these models
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
- Anker SOLIX C1000: manufacturer product page, checked 2026-08-23.
- EcoFlow DELTA 2: manufacturer product page, checked 2026-08-23.
Published specifications only; no bench tests. Method: How we verify. More: Comparisons.