C1000
- six outlets and 1,800W, still sold new
- you refill fast from the wall: 58 min
- you’ll use 600W of solar
DELTA 2
- you already own one: same 1,800W and six outlets
- you use its DC barrels and four USB-A
- you’ll add a DELTA 2 extra battery
Prices and stock checked by our price engine on November 13, 2026 at 8:00 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Two 1kWh classics with six outlets and a battery port. Only one is still sold in the US.
EcoFlow US no longer sells the DELTA 2: its page now redirects to the DELTA 3. The DELTA 2 stored 1,024Wh, delivered 1,800W from six AC outlets, took 500W of solar and one extra battery, and refilled from the wall in about 80 minutes, at 27 lb. The Anker SOLIX C1000 stores 1,056Wh and delivers the same 1,800W from six outlets, takes 600W of solar and one BP1000 battery, and refills in 58 minutes, at 28.4 lb.
Below: what changed with numbers, a 20-second calculator for your own gear, seven modeled situations, a third option, and what published tests found on each.
If you’re buying today, the C1000 or the DELTA 3: EcoFlow US no longer sells the DELTA 2. Against it, the C1000 keeps the 1,800W, six outlets and battery port, and adds 100W of solar input and a faster wall refill.
- you refill from the wall: 58 min
- you’ll use 600W of solar
- one BP1000 battery is enough
- it already covers six plugs
- you use its DC barrels
- you’ll add one extra battery
The five differences that decide it
Both deliver 1,800W from six AC outlets, have a 12V car socket and take one extra battery. These five gaps decide it.
Will it run your setup? Check in 20 seconds
Estimates use 85% usable capacity and 70% of rated solar output. Real results vary with temperature, inverter load, shade and appliance cycling. Fridge and freezer watts are daily averages and do not include compressor startup surges.
Runtime by appliance, one at a time
Simple energy estimates, not measured runtimes. About 898Wh usable on the C1000 and 870Wh on the DELTA 2; StorageReview measured 850Wh from a DELTA 2 at a 270W load.
Practically a tie: the C1000 holds only 3% more than the DELTA 2.
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What the current options cost today
The DELTA 3 is where EcoFlow US now sends DELTA 2 shoppers: the same six outlets, 12V socket, DC barrels and battery port, with a 10ms UPS. The C1000 is the other route to a six-outlet 1kWh with one battery of headroom; the price section compares both at today’s prices.
The third option: the EcoFlow DELTA 3 at $579
EcoFlow DELTA 3: $579 today
Where EcoFlow US now sends DELTA 2 shoppers. Same 1,024Wh and 1,800W, six AC outlets, a 126W car socket, two DC barrels, 500W of solar and a 10ms UPS, and it grows to about 5kWh with DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 extra batteries. OutdoorGearLab measured 870Wh out of it and a full wall charge in about 50 minutes. Our DELTA 3 review goes deeper. See the DELTA 3 at EcoFlow.
Seven modeled situations, worked out
Same formula as the calculator above, with no extra battery. The fridge averages 60W, about 525kWh a year.
24-hour outage, essentials only
A practical tie: an evening and a night each, and both take one extra battery.
CPAP, two nights
Both cover two nights. Reviewers quote about 30ms for the DELTA 2’s EPS; for a CPAP or a PC, the DELTA 3’s 10ms is the safer current choice.
Six plugs at once
Both take all six plugs.
12V gear in a van
The DELTA 2 also had two DC barrels; on the C1000, barrel-plug gear needs an adapter from the car socket.
Refill from solar, each at its maximum
Close. CleanTechnica filled its DELTA 2 in 3 hours from solar.
Refill from the wall before a storm
The C1000 is full about 20 minutes sooner.
A full-size fridge, nothing else
Same runtime. With solar during the day, either can carry a fridge through a multi-day outage.
Nine more differences, the spec sheet and the box
Smaller gaps that rarely decide the purchase, then the full specifications and what ships in the box.
C1000 and DELTA 2 weight, dimensions and full specifications
Weight: 28.4 lb for the C1000 and 27 lb for the DELTA 2. Dimensions: 14.8 × 8.1 × 10.5 in and 15.7 × 8.3 × 11 in. DELTA 2 figures come from EcoFlow Canada’s page for the same 120V model.
Anker SOLIX C1000 and EcoFlow DELTA 2 full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
C1000
- C10001,056Wh, 28.4 lb
- AC charging cable
- User manual
DELTA 2
- DELTA 21,024Wh, 27 lb
- AC charging cable
- Car charging cable
- User manual and warranty card
C1000 from the Anker US page; DELTA 2 contents as EcoFlow listed them when it was on sale.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
C1000: AC has priority over solar; no simultaneous charging (Anker FAQ)DELTA 2: X-Stream AC charging, 1,200W
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
C1000
DELTA 2
Practical consequence: six AC outlets, a car socket and a battery port on both. The DELTA 2 added two more USB-A ports and two DC barrels; the C1000 adds a light bar.
09 · NoiseNoise: C1000 vs DELTA 2
Both get loud when pushed. The Technology Man measured the EcoFlow DELTA 2 at 58dB while fast charging; OutdoorGearLab found the Anker SOLIX C1000‘s fan one of the loudest it tested at maximum load.
Neither brand publishes a noise rating.Every figure we found, with its source
No decibel figure published.
What reviewers heard: Its fan at maximum load was one of the loudest OutdoorGearLab tested; Trusted Reviews found the small fans slightly harsh and quite loud near maximum AC load (UK unit).
What reviewers heard: A lower 800W charge rate cut the noise by about 10dB (The Technology Man, UK unit).
Measured by a tester Brand figure
- Lower the AC charging speed overnight.
Cold and heat: C1000 vs DELTA 2
For a cold garage, the Anker SOLIX C1000 discharges down to −4°F; in heat, the EcoFlow DELTA 2 is rated to 113°F against 104°F. Neither charges below freezing.
Figures from the Anker US tech specs and EcoFlow Canada’s DELTA 2 page.- Charge either one indoors in winter: neither charges below 32°F.
App, UPS and smart features
The EcoFlow DELTA 2 could combine AC and solar charging; the Anker SOLIX C1000 can’t. Both take one extra battery and use their app over Wi-Fi and Bluetooth.
Neither publishes a firm UPS switchover time. For a desktop PC, the DELTA 3’s 10ms is the safer current choice.Can it charge from AC and solar at once? The EcoFlow DELTA 2’s X-Stream could combine AC and solar; the Anker SOLIX C1000 can’t.
Does it work as a UPS? Anker lists UPS on the Anker SOLIX C1000 without a switchover time; reviewers quote about 30ms for the EcoFlow DELTA 2’s EPS mode. For a desktop PC, the DELTA 3’s 10ms is the safer current choice.
Can you add a battery later? Both take one extra battery: a BP1000 on the Anker SOLIX C1000 (2,112Wh in all), a DELTA 2 or DELTA Max extra battery on the EcoFlow DELTA 2.
Can it run a heater or kettle above its rating? Both have a boost mode for heating loads: SurgePad to 2,400W on the Anker SOLIX C1000, X-Boost to 2,200W on the EcoFlow DELTA 2.
How does the app connect? Both use their brand’s app over Wi-Fi or Bluetooth for monitoring, output control and charging speed.
Warranty and support
The Anker SOLIX C1000 carries 5 years, activated when you register it. EcoFlow’s US warranty table lists the EcoFlow DELTA 2 at 5 years, with nothing to register.
Same 3,000-cycle rating on both.Subject to each brand’s warranty terms and eligibility.
Anker and EcoFlow both rate their model at 3,000 cycles to 80% capacity, about 8 years at one full cycle a day. On paper, neither outlasts the other.
- If you choose the C1000, register it with Anker the day it arrives: Anker’s registration page says registering activates the 5-year protection.
- If you find a DELTA 2 from another seller, keep the receipt: EcoFlow’s US warranty table lists it at 5 years, though EcoFlow US no longer sells it.
What reviewers report
We have not lab-tested these two units. Here is what 9 published reviews found, with the source, author and date for each point. Reviews of UK and EU units are flagged: those models charge from 230V outlets and have different sockets, so their charge times and outlet findings don’t carry over to US units.
C1000: OutdoorGearLab (May 2025), Trusted Reviews (January 2024, UK unit), TechRadar (November 2024), Digital Camera World (January 2024, UK unit)DELTA 2: StorageReview (December 2022), CleanTechnica (October 2022), The Technology Man (UK unit), Trusted Reviews (December 2022, UK unit), SlashGear
Usable capacity
- C1000Reviewer On AC output the C1000 delivered 897Wh, about 85% of its rated 1,056Wh. OutdoorGearLab, Kenji Mowrey, May 2025
- C1000Reviewer At a constant 200W load it supplied 0.89kWh (84.2%); at 750W it reached 0.95kWh (89.8%). Battery data usable, UK 230V inverter. Trusted Reviews, Simon Handby, January 2024, UK unit
- C1000Reviewer Round-trip efficiency measured 83.3% for AC in and AC out, 87.6% when discharging over USB. Trusted Reviews, Simon Handby, January 2024, UK unit
- C1000Reviewer Adding the expansion battery with one cable brought the system to 2,112Wh. TechRadar, Collin Probst, November 2024
- DELTA 2Reviewer With a steady 270W load, the testers measured 0.85kWh of total output from the 1,024Wh battery. StorageReview, Kevin OBrien, December 2022
Charging
- C1000Reviewer The included AC cord gave a full charge in 88 minutes; the app’s ultra-fast mode cut it to 65 minutes. OutdoorGearLab, Kenji Mowrey, May 2025
- C1000Reviewer In ultra-fast mode it reached 80% in 42 minutes and full in 54 minutes. UK mains unit, flag for US charging power. Trusted Reviews, Simon Handby, January 2024, UK unit
- C1000Reviewer HyperFlash AC charging came very close to Anker’s 58-minute claim; the reviewer suggests leaving it off by default. UK unit. Digital Camera World, Adam Juniper, January 2024, UK unit
- DELTA 2Reviewer It pulled 1,100W from a wall outlet and filled in under an hour. CleanTechnica, Kyle Field, October 2022
- DELTA 2Reviewer Solar panels set up at 9am in Southern California filled it in 3 hours without being moved. CleanTechnica, Kyle Field, October 2022
- DELTA 2Reviewer From flat, it reached 80% in just under 50 minutes and 100% in just under 80, matching EcoFlow’s claims. The Technology Man, UK unit
- DELTA 2Reviewer On a bright day a solar panel peaked at 295W, enough to fill the battery in under 4 hours. Trusted Reviews, David Ludlow, December 2022, UK unit
Noise and heat
- C1000Reviewer Its fan at maximum load was one of the loudest of all the power stations they tested. OutdoorGearLab, Kenji Mowrey, May 2025
- C1000Reviewer The small fans sound slightly harsh and get quite loud near maximum AC load. Trusted Reviews, Simon Handby, January 2024, UK unit
- DELTA 2Reviewer Measured 58dB at 1 m with the fans at full speed while fast charging; a lower 800W charge rate cut it by 10dB. The Technology Man, UK unit
UPS and output
- C1000Reviewer Run at its maximum output, it lasted 33 minutes before shutting off, without overheating. OutdoorGearLab, Kenji Mowrey, May 2025
- C1000Reviewer Using the claimed 20ms switchover, a test PC and NAS kept running when mains power was cut. Trusted Reviews, Simon Handby, January 2024, UK unit
- C1000Reviewer Used daily as the UPS for a heavy home-office workstation; repeated simulated outages caused no issue. TechRadar, Collin Probst, November 2024
Daily use and issues
- C1000Reviewer Measured weight was 28.65 lb. OutdoorGearLab, Kenji Mowrey, May 2025
- C1000Reviewer The app cannot set a maximum charge percentage, only the input speed. OutdoorGearLab, Kenji Mowrey, May 2025
- C1000Reviewer The app connects over Wi-Fi for remote control, or Bluetooth when no Wi-Fi is available. TechRadar, Collin Probst, November 2024
- C1000Reviewer Weight is nearly 12.9kg (about 29 lb), better suited to a car or RV than carrying far. Digital Camera World, Adam Juniper, January 2024, UK unit
Practical limits before you buy
- EcoFlow US no longer sells the DELTA 2. Its US page redirects to the DELTA 3; EcoFlow’s US warranty table still lists it at 5 years, but check the seller before buying one.
- Check the C1000’s expansion battery. The BP1000 page didn’t load for our price engine on October 30, 2026; confirm availability before counting on it.
- Both stop at 1,800W continuous. A microwave and a coffee maker together overload both.
- The C1000 can’t charge from AC and solar together. AC takes priority.
- The C1000 has no DC barrels. 12V barrel-plug gear needs an adapter from the car socket.
- Heating-load modes don’t help motors.
- Solar cables are extra on both.
Frequently asked questions
Is the DELTA 2 still sold?
Not by EcoFlow US: its page now redirects to the DELTA 3, its successor.
Is the C1000 a good replacement for a DELTA 2?
Close: the same 1,800W, six AC outlets and one extra battery, with faster wall charging and 600W of solar. It drops the DELTA 2’s DC barrels and two of its USB-A ports.
Should I replace my DELTA 2 with a C1000?
No. Same output, outlets and expansion; the gains are a faster wall refill and 100W more solar input.
Which charges faster?
The C1000: 58 minutes from the wall against about 80, and 600W of solar against 500W.
Which is better as a UPS?
Neither publishes a firm figure; reviewers quote about 30ms for the DELTA 2’s EPS, and Anker lists UPS on the C1000 without a time. For a desktop PC, look at the DELTA 3’s 10ms.
How long will each run a refrigerator?
At a 60W average and 85% usable capacity: about 15 hours on the C1000 and 14.5 on the DELTA 2.
Can I add a battery to either?
Yes: one BP1000 on the C1000, one DELTA 2 or DELTA Max extra battery on the DELTA 2.
Is there a third option?
Yes: the DELTA 3, the DELTA 2’s successor, with six outlets, DC barrels, a 10ms UPS and expansion to about 5kWh.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. C1000 specs come from Anker US; DELTA 2 specs from EcoFlow Canada’s page for the same 120V model, because EcoFlow US redirects its DELTA 2 page to the DELTA 3. Usage observations are attributed to named reviewers. Checked on October 30, 2026.
- Specs: Anker US, C1000 and EcoFlow Canada, DELTA 2, read on October 30, 2026.
- Reviewer reports on the C1000: OutdoorGearLab, Kenji Mowrey, May 2025, Trusted Reviews, Simon Handby, January 2024, UK unit, TechRadar, Collin Probst, November 2024, Digital Camera World, Adam Juniper, January 2024, UK unit; on the DELTA 2: StorageReview, Kevin OBrien, December 2022, CleanTechnica, Kyle Field, October 2022, The Technology Man, UK unit, Trusted Reviews, David Ludlow, December 2022, UK unit, SlashGear, Ewdison Then.
- Runtime = capacity × 0.85 ÷ watts. Solar harvest = min(panel watts, max input) × sun hours × 0.70.
Same 1,800W, six outlets and a battery port. The C1000 refills faster; the DELTA 2 is no longer sold by EcoFlow US.
Prices checked November 13, 2026 at 8:00 AM EST
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Originally published: November 8, 2026