C1000 Gen 2
- you run up to 2,000W
- you refill fast from the wall: 49 min
- you want it lighter: 24.9 lb
DELTA 3
- you’ll grow to about 5kWh
- you plug in six devices and 12V gear
- you want an IP65 battery pack
Prices and stock checked by our price engine on November 13, 2026 at 5:31 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Same battery and UPS speed. One has the stronger inverter; the other is the one that grows.
The Anker SOLIX C1000 Gen 2 and the EcoFlow DELTA 3 both store 1,024Wh of LFP rated for 4,000 cycles and switch to battery in 10ms. The C1000 Gen 2 delivers 2,000W from five AC outlets, takes 600W of solar and refills from the wall in 49 minutes, at 24.9 lb, but can’t be expanded. The DELTA 3 delivers 1,800W from six outlets, adds two DC barrels and an IP65 battery pack, and grows to about 5kWh with extra batteries, at 27.6 lb.
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 1,024Wh, same 10ms UPS, same 4,000 cycles. The DELTA 3 costs $49.01 more today for a sixth outlet, two DC barrels, an IP65 pack and room to grow to about 5kWh; the C1000 Gen 2 has 200W more output, 100W more solar and a faster refill, 2.7 lb lighter.
- you run up to 2,000W
- you refill from the wall: 49 min
- 1kWh is enough, for $49.01 less
- you’ll grow past 1kWh
- you plug in six devices
- you run 12V barrel gear
The five differences that decide it
The five gaps that decide the purchase, with the better spec for most buyers flagged. Both store 1,024Wh of LFP rated for 4,000 cycles, switch to battery in 10ms, have a 12V car socket and two 100W-class USB-C ports, and carry a 5-year warranty.
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 870Wh usable on both; OutdoorGearLab measured 890Wh out of the C1000 Gen 2 and 870Wh out of the DELTA 3.
Same battery, same runtime.
The C1000 Gen 2 and the DELTA 3 both hold about 870Wh usable, so every appliance runs just as long on either one.Get our Black Friday alerts for power stations
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The price gap, in numbers
Same 1,024Wh battery: the Anker SOLIX C1000 Gen 2 costs $49.01 less than the EcoFlow DELTA 3.
Prices refresh daily from Anker US and EcoFlow US.Same capacity and the same 4,000-cycle rating to 80%, so the price gap is the main money question. Only the DELTA 3 has a route to 2kWh and beyond. Both prices move often; the figures are refreshed daily by our price engine.
The third option: the BLUETTI Elite 100 V2 at $499
BLUETTI Elite 100 V2: $499 today
The same 1kWh class with 1,000W of solar input, the most of the three, a 10ms UPS, 1,800W from four outlets, two DC barrels and a rated 30dB under 600W, at 25.3 lb. It can’t be expanded. Pick it if you’ll charge from big solar arrays. Our Elite 100 V2 review goes deeper. See the Elite 100 V2 at BLUETTI.
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
Identical: an evening and a night each. Only the DELTA 3 can add a battery for a second day.
CPAP, two nights
Both cover two nights and both switch in 10ms if the grid drops.
Microwave and toaster at once
Only the C1000 Gen 2 has the headroom, barely. On the DELTA 3, run them one after the other.
Refill from solar, each at its maximum
Close; the C1000 Gen 2 takes 100W more.
Refill from the wall before a storm
Both under an hour; OutdoorGearLab measured 50 minutes on the DELTA 3. The C1000 Gen 2’s UltraFast speed needs the battery above 68°F, per Anker.
Home office through an outage
Identical, and both switch in 10ms, inside what desktop power supplies ride through.
Growing the system
Only the DELTA 3 grows; Anker dropped the C1000 Gen 2’s battery port to save size and weight.
Carrying it
Both are one-hand carries; the C1000 Gen 2 is 2.7 lb lighter.
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 Gen 2 and DELTA 3 weight, dimensions and full specifications
Weight: 24.9 lb for the C1000 Gen 2 and 27.6 lb for the DELTA 3. Dimensions: 15.1 × 8.2 × 9.6 in and 15.7 × 8.0 × 11.2 in. Everything else is in the sheet below.
Anker SOLIX C1000 Gen 2 and EcoFlow DELTA 3 full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
C1000 Gen 2
- C1000 Gen 2 power station1,024Wh, 24.9 lb
- AC charging cable
- User manual
- Solar cable sold separately
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 Gen 2: OutdoorGearLab averaged 1,097Wh per hour from the wallDELTA 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 Gen 2
DELTA 3
Practical consequence: the DELTA 3 has a sixth AC outlet, two DC barrels and a battery port; the C1000 Gen 2 a 140W USB-C.
09 · NoiseNoise: C1000 Gen 2 vs DELTA 3
Under heavy load, the EcoFlow DELTA 3 should be the quieter one: EcoFlow rates it under 40dB at 1,200W, while Notebookcheck measured the Anker SOLIX C1000 Gen 2 at about 45dB under high output and fast charging.
Anker lists 20dB with no conditions. The DELTA 3 figures are EcoFlow’s; we found no independent measurement.Every figure we found, with its source
What reviewers heard: The fan gets loud near maximum wattage (OutdoorGearLab) and kicks on loudly at very high charging rates (CleanTechnica); much quieter at low load (Notebookcheck).
Measured by a tester Brand figure
- Cap the AC charging speed in the app overnight.
Cold and heat: C1000 Gen 2 vs DELTA 3
For a cold garage, the Anker SOLIX C1000 Gen 2 runs down to −4°F; for a hot car or a wet deck, the EcoFlow DELTA 3 is rated to 113°F and has an IP65 battery pack. Neither charges below freezing.
Figures from Anker US for the C1000 Gen 2 and EcoFlow US for the DELTA 3.- Charge either one above freezing: neither charges below 32°F.
- For the C1000 Gen 2’s 49-minute UltraFast refill, the battery must be above 68°F, per Anker.
App, UPS and smart features
The EcoFlow DELTA 3 does more: it takes extra batteries, starts a generator on its own and warns you before storms. The Anker SOLIX C1000 Gen 2 matches it on UPS, off-peak charging and heater boost.
Same 10ms UPS. The gap is expansion, generator control and storm alerts.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Can you add a battery later? The EcoFlow DELTA 3 takes DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 extra batteries, up to about 5kWh; Anker dropped expansion from the Anker SOLIX C1000 Gen 2.
Can it start a generator by itself? The EcoFlow DELTA 3 starts and stops an EcoFlow Smart Generator automatically; Anker lists no such feature for the Anker SOLIX C1000 Gen 2.
Does it prepare for storms? The EcoFlow DELTA 3 has Storm Warning Alert in the EcoFlow app; Anker lists no storm feature for the Anker SOLIX C1000 Gen 2.
Does it work as a UPS? Both switch to battery in 10ms, inside the roughly 16ms a desktop PC power supply rides through at full load.
Can it run a heater or kettle above its rating? Both run heaters past their rating at reduced power: SurgePad to 2,400W on the Anker SOLIX C1000 Gen 2, X-Boost to 2,200W on the EcoFlow DELTA 3. Neither helps motors.
Can it charge off-peak? Both have a time-of-use mode in their app, to charge during off-peak hours.
How does the app connect? Both use their brand’s app over Wi-Fi or Bluetooth.
Warranty and support
Both carry 5 years. The EcoFlow DELTA 3 gets them with no condition; the Anker SOLIX C1000 Gen 2 gets them once you register it with Anker.
Same term, same 4,000-cycle rating. Only the Anker asks you to register.Subject to each brand’s warranty terms and eligibility.
Anker and EcoFlow both rate their model at 4,000 cycles to 80% capacity, about 11 years at one full cycle a day. On paper, neither outlasts the other.
- If you choose the C1000 Gen 2, register it with Anker the day it arrives: Anker’s registration page says registering activates the 5-year protection, and the US product page lists no term.
- 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 6 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 Gen 2: OutdoorGearLab (July 2026), Notebookcheck (December 2025, EU unit), CleanTechnica (September 2025), MacRumors (December 2025), Techaeris (November 2025)DELTA 3: OutdoorGearLab (July 2026)
Usable capacity
- C1000 Gen 2Reviewer Their load bank measured 890Wh of the rated 1,024Wh, about 87%, well above average. OutdoorGearLab, Kenji Mowrey, July 2026
- C1000 Gen 2Reviewer At a steady 250W load (230V) it gave 850Wh, 83%, before stopping at 1%; lower with fluctuating loads. Notebookcheck, Marcus Schwarten, December 2025, EU unit
- C1000 Gen 2Reviewer Ran a full Mac setup (MacBook Pro, Studio Display, lights) for almost 24 hours. MacRumors, Juli Clover, December 2025
- DELTA 3Reviewer OutdoorGearLab measured 870Wh of usable AC energy from the 1,024Wh pack, about 85 percent. OutdoorGearLab, Kenji Mowrey, July 2026
Charging
- C1000 Gen 2Reviewer Without the app’s boost mode AC charging took just under 55 minutes; 1,110Wh flowed in. EU charging power, flag. Notebookcheck, Marcus Schwarten, December 2025, EU unit
- C1000 Gen 2Reviewer Recharged to full in 49 minutes from a standard plug, drawing about 1,200W; 1,600W needs enabling. MacRumors, Juli Clover, December 2025
- 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
- C1000 Gen 2Reviewer Near maximum wattage the fan gets frustratingly loud, an issue carried over from the first generation. OutdoorGearLab, Kenji Mowrey, July 2026
- C1000 Gen 2Reviewer Measured about 45dB at 1m under high output and fast AC charging; much quieter at low load. Notebookcheck, Marcus Schwarten, December 2025, EU unit
- C1000 Gen 2Reviewer At very high charging rates the fans kick on loudly. CleanTechnica, Kyle Field, September 2025
- C1000 Gen 2Reviewer Fan noise at full blast is loud and irritating, but only under heavy load. MacRumors, Juli Clover, December 2025
UPS and output
- C1000 Gen 2Reviewer It ran a refrigerator and gear flawlessly over a 4-day Cybertruck road trip used as a buffer battery. CleanTechnica, Kyle Field, September 2025
- DELTA 3Reviewer It kept a refrigerator running overnight in their use. OutdoorGearLab, Kenji Mowrey, July 2026
Daily use and issues
- C1000 Gen 2Reviewer Measured weight 25.2 lb, one of the best power-to-weight ratios they have tested. OutdoorGearLab, Kenji Mowrey, July 2026
- C1000 Gen 2Reviewer Compared with Gen 1 it lost the expansion port and the built-in LED light. Notebookcheck, Marcus Schwarten, December 2025, EU unit
- C1000 Gen 2Reviewer At 24.9 lb it is easy to lift with one hand. CleanTechnica, Kyle Field, September 2025
- C1000 Gen 2Reviewer App over Wi-Fi or Bluetooth shows draw and time left, toggles outputs and sets charging power. MacRumors, Juli Clover, December 2025
- C1000 Gen 2Reviewer The app can switch AC and DC outputs on or off remotely and toggles the 1,600W fast-charge mode. Techaeris, Alex Hernandez, November 2025
- 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
- The C1000 Gen 2 can’t be expanded. 1,024Wh is its ceiling.
- The DELTA 3 stops at 1,800W, the C1000 Gen 2 at 2,000W. A microwave and a coffee maker together overload both.
- Only three of the DELTA 3’s six outlets are grounded, per OutdoorGearLab.
- The C1000 Gen 2’s 49-minute refill needs the battery above 68°F, per Anker.
- The C1000 Gen 2’s USB-A port and first USB-C share 20W.
- Heating-load modes don’t help motors.
- Solar cables are extra on both.
- C1000 Gen 2, per its US documentation: UltraFast charging only activates when battery temperature is above 68F (20C); charging at 32-68F is significantly slower.
- C1000 Gen 2, per its US documentation: USB-A and USB-C1 share a 20W total limit; only USB-C2 reaches 140W.
- C1000 Gen 2, per its US documentation: Not expandable; Anker recommends the original C1000 for users who need extra capacity.
- C1000 Gen 2, per its US documentation: Normal AC charging 1,200W max; AC bypass 1,800W max; solar 600W, 60V max.
- 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 Gen 2 and the EcoFlow DELTA 3?
Same 1,024Wh, 10ms UPS and 4,000 cycles. The C1000 Gen 2 delivers 2,000W, takes 600W of solar and refills in 49 minutes; the DELTA 3 has six outlets, DC barrels, an IP65 pack and grows to about 5kWh.
Which is cheaper?
The Anker SOLIX C1000 Gen 2 costs $49.01 less today: $529.99, against $579 for the EcoFlow DELTA 3. Prices refresh daily; the price section above has the full breakdown.
Can either be expanded?
Only the DELTA 3, to about 5kWh with EcoFlow extra batteries.
Which is better as a UPS?
A tie: both switch in 10ms.
Which charges faster?
The C1000 Gen 2, a little: 49 minutes from the wall against 56, and 600W of solar against 500W.
How long will each run a refrigerator?
At a 60W average and 85% usable capacity: about 14.5 hours on either, before extra batteries.
Which is quieter?
EcoFlow rates the DELTA 3 at under 30dB at 600W. Notebookcheck measured about 45dB from the C1000 Gen 2 under high load, much quieter at low load.
How much do they weigh?
24.9 lb for the C1000 Gen 2 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 Gen 2 and its datasheet, and EcoFlow US, DELTA 3, read on October 30, 2026.
- Reviewer reports on the C1000 Gen 2: OutdoorGearLab, Kenji Mowrey, July 2026, Notebookcheck, Marcus Schwarten, December 2025, EU unit, CleanTechnica, Kyle Field, September 2025, MacRumors, Juli Clover, December 2025, Techaeris, Alex Hernandez, November 2025; 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).
Same 1kWh and 10ms UPS. The C1000 Gen 2 has 2,000W and a 49-minute refill for $49.01 less; the DELTA 3 has six outlets and grows to about 5kWh.
Prices checked November 13, 2026 at 5:31 AM EST
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Originally published: November 12, 2026