C1000
- six outlets and 1,800W for $99.01 less
- you’ll use 600W of solar
- you want a built-in light bar
DELTA 3
- you’ll grow to about 5kWh
- a PC or a CPAP needs the 10ms UPS
- you cycle it often: 4,000 cycles
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 boxes with six outlets and a battery port. $99.01 separates them today.
The Anker SOLIX C1000 stores 1,056Wh and the EcoFlow DELTA 3 1,024Wh; both deliver 1,800W from six AC outlets and take extra batteries. The C1000 takes 600W of solar, refills from the wall in 58 minutes and grows to 2,112Wh. The DELTA 3 takes 500W of solar, refills in 56 minutes, switches to battery in a documented 10ms, grows to about 5kWh and is rated for 4,000 cycles against 3,000, with an IP65-rated battery pack.
Below: every difference with numbers, a 20-second calculator for your own gear, eight modeled situations, a third option, and what published tests found on each.
Same 1,800W and six outlets on both, both expandable. The DELTA 3 costs $99.01 more today for a documented 10ms UPS, 4,000 rated cycles, an IP65 battery pack and room to grow to about 5kWh; the C1000 takes 100W more solar.
- you want 1kWh for $99.01 less
- you’ll use 600W of solar
- you want a light bar
- you’ll grow past 2kWh
- you protect a PC: 10ms
- you want 4,000 cycles
The five differences that decide it
The five gaps that decide the purchase, with the better spec for most buyers flagged. Both deliver 1,800W from six AC outlets, have a 12V car socket, take an extra battery, refill from the wall in under an hour and weigh about 28 lb.
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 3; OutdoorGearLab measured 870Wh out of the DELTA 3.
Practically a tie: the C1000 holds only 3% more than the DELTA 3.
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The price gap, in numbers
The Anker SOLIX C1000 costs $99.01 less than the EcoFlow DELTA 3 and still holds 32Wh more.
Prices refresh daily from Anker US and EcoFlow US.Both brands rate cycles to 80% capacity. The C1000’s BP1000 battery page didn’t load for our price engine on October 30, 2026, so we can’t show a live price for the C1000’s 2kWh route. Both prices move often; the figures are refreshed daily by our price engine.
The third option: the Anker C1000 Gen 2 at $529.99
Anker SOLIX C1000 Gen 2: $529.99 today
Anker’s newer 1kWh: 1,024Wh, 2,000W from five outlets, a 10ms UPS, a 49-minute wall refill and 4,000 cycles, at 24.9 lb. It drops the C1000’s battery port. Pick it if you want more power than either in a lighter box. Our C1000 vs C1000 Gen 2 comparison goes deeper. See the C1000 Gen 2 at Anker.
Eight 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. Both take an extra battery for a second day.
CPAP, two nights
Both cover two nights. The DELTA 3’s documented 10ms switchover is the safer one for a CPAP left plugged in through it.
Six plugs at once
Both take all six. OutdoorGearLab notes only three of the DELTA 3’s six outlets are grounded three-prong sockets.
Refill from solar, each at its maximum
Close; the C1000 takes 100W more and refills about 25 minutes sooner.
Refill from the wall before a storm
A tie: both under an hour. OutdoorGearLab measured 50 minutes on the DELTA 3.
Home office through an outage
Both carry a workday. The DELTA 3’s 10ms switchover is documented; Anker lists UPS on the C1000 without a time.
Growing the system
The C1000 tops out at one battery; the DELTA 3 takes several EcoFlow extra batteries.
Carrying it
Practically the same weight; both are one-hand carries.
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 3 weight, dimensions and full specifications
Weight: 28.4 lb for the C1000 and 27.6 lb for the DELTA 3. Dimensions: 14.8 × 8.1 × 10.5 in and 15.7 × 8.0 × 11.2 in. Everything else is in the sheet below.
Anker SOLIX C1000 and EcoFlow DELTA 3 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 3
- DELTA 3 power station1,024Wh, 27.6 lb
- AC charging cable
- Manuals and warranty card
- Solar cable sold separatelyEcoFlow Solar to XT60i cable; a reviewer flagged its absence
- No car charging cablesold separately, per the manual
From the Anker and EcoFlow US product pages and manuals.
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 3: 800W Alternator Charger, Smart Generator at 1,500W
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
C1000
DELTA 3
Practical consequence: six AC outlets and a battery port on both. The DELTA 3 adds two DC barrels and faster USB; the C1000 a light bar.
09 · NoiseNoise: C1000 vs DELTA 3
The EcoFlow DELTA 3 has the quieter record: EcoFlow rates it under 30dB at 600W and under 40dB at 1,200W. Anker publishes no figure for the Anker SOLIX C1000, and OutdoorGearLab found its fan one of the loudest of any power station it reviewed at maximum load.
We found no independent dB measurement for either model.Every figure we found, with its source
No decibel figure published.
What reviewers heard: At maximum load, one of the loudest fans of all the power stations it reviewed (OutdoorGearLab); small fans that sound slightly harsh and get quite loud near maximum AC load (Trusted Reviews, UK unit).
Measured by a tester Brand figure
- Cap the AC charging speed in the app overnight.
Cold, heat and storage: C1000 vs DELTA 3
For a cold garage, the Anker SOLIX C1000 keeps running down to −4°F; for heat and wet weather, the EcoFlow DELTA 3 is rated to 113°F and its battery pack to IP65. Neither charges below freezing.
Figures from the Anker and EcoFlow US tech specs.- Charge either one indoors in winter: neither charges below 32°F.
- To store the C1000, turn off the outputs, keep it dry and cool, recharge to 100% if it drops below 30%, and fully charge it every 3 months (Anker).
App, UPS and smart features
The EcoFlow DELTA 3 does more: a documented 10ms UPS, storm alerts, time-of-use settings and generator control. The Anker SOLIX C1000 matches it on app connection and takes one extra battery.
Both apps run over Wi-Fi and Bluetooth. The DELTA 3 grows further, to about 5kWh.Can it charge off-peak? The EcoFlow DELTA 3 has time-of-use settings in the EcoFlow app; the Anker app offers power scheduling for the Anker SOLIX C1000, with no time-of-use mode listed.
Does it prepare for storms? The EcoFlow DELTA 3 has a Storm Warning Alert in the app; Anker lists no such feature for the Anker SOLIX C1000.
Can it start a generator by itself? The EcoFlow DELTA 3 can start and stop EcoFlow’s Smart Generator 3000 on its own; Anker lists no generator control for the Anker SOLIX C1000.
Does it work as a UPS? EcoFlow rates the EcoFlow DELTA 3 at under 10ms, inside the roughly 16ms a desktop PC power supply rides through; Anker lists UPS on the Anker SOLIX C1000 without a switchover time.
Can you add a battery later? Both take extra batteries: one BP1000 brings the Anker SOLIX C1000 to 2,112Wh; EcoFlow’s DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 extra batteries take the EcoFlow DELTA 3 to about 5kWh.
Can it run a heater or kettle above its rating? Both run heating loads past their 1,800W rating at reduced power: SurgePad to 2,400W on the Anker SOLIX C1000, X-Boost to 2,200W on the EcoFlow DELTA 3. Neither helps motors.
How does the app connect? Both use their brand’s app over Wi-Fi or Bluetooth, to set charging speed and check status.
Warranty and support
Both get 5 years. Anker lists 5 years for the Anker SOLIX C1000, and its registration page says registering activates them; EcoFlow lists the EcoFlow DELTA 3 at 5 years with no registration condition.
Same term on paper. Only the C1000 ties it to registration.Subject to each brand’s warranty terms and eligibility.
Anker rates the C1000 at 3,000 cycles and EcoFlow the DELTA 3 at 4,000, both to 80% capacity: about 8 and 11 years at one full cycle a day.
- If you choose the C1000, register it with Anker: its registration page says that is what activates the 5 years.
- The DELTA 3 needs no registration to get its 5 years.
What reviewers report
We have not lab-tested these two units. Here is what 5 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 3: OutdoorGearLab (July 2026)
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 3Reviewer OutdoorGearLab measured 870Wh of usable AC energy from the 1,024Wh pack, about 85 percent. OutdoorGearLab, Kenji Mowrey, July 2026
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 3Reviewer A full wall charge took 50 minutes in their test, a little faster than the 56 minutes EcoFlow advertises. OutdoorGearLab, Kenji Mowrey, July 2026
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
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
- DELTA 3Reviewer It kept a refrigerator running overnight in their use. OutdoorGearLab, Kenji Mowrey, July 2026
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
- DELTA 3Reviewer Only three of the six AC outlets are grounded three-prong sockets, which limits multi-appliance setups. OutdoorGearLab, Kenji Mowrey, July 2026
- DELTA 3Reviewer Measured weight was 28.1 lbs, slightly heavy and long for the 1,000Wh class. OutdoorGearLab, Kenji Mowrey, July 2026
Practical limits before you buy
- 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.
- Only three of the DELTA 3’s six outlets are grounded, per OutdoorGearLab.
- The C1000 can’t charge from AC and solar together. AC takes priority.
- Heating-load modes don’t help motors.
- Solar cables are extra on both.
- Neither can fly. Both are about ten times the 100Wh carry-on limit.
- C1000, per its US documentation: AC and DC inputs cannot charge at the same time; AC input takes priority, then it switches to DC when AC charging ends.
- C1000, per its US documentation: SurgePad (up to 2,400W) works best with heat-generating devices and does not support precision instruments or voltage-sensitive devices.
- C1000, per its US documentation: Storage: turn off outputs, store dry and cool, recharge to 100% if below 30%, fully charge every 3 months.
- C1000, per its US documentation: Charging temperature 32 to 104F; discharging -4 to 104F. Max AC input 1,300W, solar 600W (11-60V).
- DELTA 3, per its US documentation: Single solar input: 11-60V, 500W max (the DELTA 3 Plus has two).
Frequently asked questions
What is the difference between the Anker C1000 and the EcoFlow DELTA 3?
Both deliver 1,800W from six outlets and take extra batteries. The C1000 takes 600W of solar; the DELTA 3 has a documented 10ms UPS, 4,000 rated cycles, an IP65 battery pack and grows to about 5kWh.
Which is cheaper?
The Anker SOLIX C1000 costs $99.01 less today: $479.99, against $579 for the EcoFlow DELTA 3. Per Wh, the C1000 is cheaper: $0.45, against $0.57. Prices refresh daily; the price section above has the full breakdown.
Which can grow further?
The DELTA 3, to about 5kWh with EcoFlow extra batteries. The C1000 takes one BP1000 for 2,112Wh.
Which is better as a UPS?
The DELTA 3, with a documented switchover under 10ms; Anker lists UPS on the C1000 without a time.
Which charges faster?
From the wall, a tie: 58 minutes on the C1000, 56 on the DELTA 3. From solar, the C1000, with 600W against 500W.
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 3, before extra batteries.
Which is quieter?
EcoFlow rates the DELTA 3 at under 30dB at 600W. Anker publishes no figure for the C1000, and OutdoorGearLab found its fan one of the loudest at full load.
How much do they weigh?
28.4 lb for the C1000 and 27.6 lb for the DELTA 3.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. Specs come from Anker and EcoFlow US documentation; usage observations are attributed to named reviewers. Prices and availability were checked on October 30, 2026.
- Specs: Anker US, C1000 and EcoFlow US, DELTA 3, 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 3: OutdoorGearLab, Kenji Mowrey, July 2026.
- Runtime = capacity × 0.85 ÷ watts. Solar harvest = min(panel watts, max input) × sun hours × 0.70. Cost per lifetime kWh = price ÷ (cycles × capacity in kWh).
Six outlets and 1,800W on both. The C1000 costs $99.01 less; the DELTA 3 has a 10ms UPS, 4,000 cycles and grows to about 5kWh.
Prices checked November 13, 2026 at 8:00 AM EST
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Originally published: November 8, 2026