The short answer for most people: the Anker SOLIX C1000 Gen 2 is the better buy of this pair — 2,000W continuous AC, a verified 0-100% charge in 49 minutes, a 24.9 lb frame, and a 4,000-cycle LFP rating. The EcoFlow DELTA 2 makes its case on three narrower points: 6 AC outlets, X-Boost, and an expansion path to roughly 3kWh.
Before you buy either, know that “C1000” spans two generations — the original 1,056Wh unit sold out on Anker’s own store and the current 1,024Wh Gen 2 — and that “Delta 2” is a 2022 design EcoFlow’s US store has quietly replaced with the DELTA 3 at the same product URL. Most pages ranking for anker solix c1000 vs ecoflow delta 2 compare the wrong machines as a result.
Every spec below was verified on manufacturer pages on 2026-10-21; if you are still sizing your needs, start with our guide to how many watt hours you need.
The 30-second verdict
| Model | Best for | Standout strength | Watch out for |
|---|---|---|---|
| Anker SOLIX C1000 Gen 2 | Camping, CPAP, fridge backup, fastest verified recharge | 2,000W continuous / 3,000W peak, 0-100% AC in 49 min, 24.9 lb, 4,000 cycles | Only 3 AC outlets, no expansion |
| EcoFlow DELTA 2 | Home-outage essentials, later expansion | 6 AC outlets, X-Boost to 2,200W, expansion to 2,048Wh or 3,072Wh | Undefined full-charge claim, 3,000 cycles, heavier at 27 lb |
| EcoFlow DELTA 3 | Newest Delta in EcoFlow’s US lineup | 3,600W surge, 1,500W charge to full in 56 min, 4,000 cycles, ~5kWh expansion ceiling | Occupies the Delta 2’s old store URL |
Which C1000? Which Delta 2?
Read this before you click — the naming is a mess.
| Name | Capacity | Status in 2026 |
|---|---|---|
| Anker SOLIX C1000 (Gen 1) | 1,056Wh | Sold out on Anker’s store — Notify Me only; may linger at third-party retailers |
| Anker SOLIX C1000 Gen 2 | 1,024Wh | Current version, actively sold with bundles |
| EcoFlow DELTA 2 | 1,024Wh | Still sold new — EcoFlow’s Canadian store and US retail |
| EcoFlow DELTA 3 | 1,024Wh | Occupies the Delta 2’s old us.ecoflow.com URL, no discontinuation notice |
Spot the difference: 1,056Wh and 1,800W means Gen 1 — 6 AC outlets, 28.44 lb, expansion “up to 2,112Wh (coming soon)” still listed on its page — not the 2,000W unit recommended here. Check carefully if you see an Anker SOLIX C1000 at a reseller. The head-to-head below is Gen 2 versus Delta 2, the two you can buy new today.
Spec table
| Spec | SOLIX C1000 Gen 2 | DELTA 2 | DELTA 3 (context) |
|---|---|---|---|
| Capacity | 1,024Wh | 1,024Wh | 1,024Wh |
| AC output (rated / surge) | 2,000W / 3,000W peak | 1,800W / 2,700W surge | 1,800W / 3,600W surge |
| Boost mode | None listed — check the spec sheet | X-Boost to 2,200W | X-Boost to 2,200W |
| AC outlets | 3 | 6 | 6 |
| Total ports | 10 | 15 (per spec list) | 13 |
| USB-C | 2x, one up to 140W | 2x 100W | 2x 100W |
| Solar input | 600W max, full in 1.8h | 500W max, full in 3-6h | 500W max, full in ~2h |
| AC charging / full charge | 1,200W standard, 1,600W UltraFast in app; 0-100% in 49 min | X-Stream 1,200W; “ready in just 50 mins” headline, percentage undefined, no 0-100% published | 1,500W; full in 56 min |
| Weight | 24.9 lb | 27 lb | ~27.6 lb |
| Battery chemistry | LFP | LFP | LFP |
| Cycle life | 4,000 cycles to 80% | 3,000 cycles to 80+% | 4,000 cycles to 80+% |
| Expandable to | None | 2,048Wh or 3,072Wh — check battery availability | Up to ~5kWh |
| Warranty | 5 years | 5 years | 5 years |
| UPS switchover | 10 ms | Check the spec sheet | Check the spec sheet |
Capacity and runtime
Both headline units are 1,024Wh, so runtime is a flat tie. Using a 0.85 inverter-loss factor: runtime in hours = Wh x 0.85 / watts
- CPAP at 50W: 1,024 x 0.85 / 50 = 17.4 hours
- Mini fridge at ~60W average: 1,024 x 0.85 / 60 = 14.5 hours
- TV plus router at 100W: 1,024 x 0.85 / 100 = 8.7 hours
- Electric kettle at 1,500W: 1,024 x 0.85 / 1,500 = 0.6 hours (about 35 minutes)
Run your own loads through our watt-hour calculator, and for CPAP, our best portable power station for CPAP picks cover the right overnight numbers.
The DELTA 2 can grow: one extra battery takes it to 2,048Wh, turning the mini-fridge figure into 2,048 x 0.85 / 60 = 29 hours — though EcoFlow’s Canadian store now marks that battery no longer available, so verify stock first. The C1000 Gen 2 cannot expand at all, and owners in a 3-month thread name that as their biggest complaint. That is the whole Delta 2 argument in one number: 29 hours versus 14.5.
Winner: EcoFlow DELTA 2, on expansion only. For a fixed 1,024Wh, it is a dead heat.
Power and surge
The C1000 Gen 2 runs 2,000W continuous with a 3,000W peak. The DELTA 2 runs 1,800W across all six outlets with a 2,700W surge and X-Boost to 2,200W.
X-Boost runs oversized resistive loads by dropping output voltage, so a device drawing more than 1,800W can start and run at reduced performance — a workaround for heating elements, not extra continuous rating. Judge motors and compressors against the real 1,800W figure.
A concrete load: a 1,500W kettle plus 300W of small loads is 1,800W exactly — at the DELTA 2’s ceiling with nothing to spare, while the C1000 Gen 2 still has 200W of headroom. One trap: the original C1000 was also 1,800W continuous, so a Gen 1 listing’s wattage tells you it is not the 2,000W machine.
Winner: Anker SOLIX C1000 Gen 2, both on the continuous number and on surge.
Charging speed
The C1000 Gen 2 charges at 1,200W standard, or 1,600W with UltraFast enabled in the app (battery above 20°C/68°F). Anker publishes 0-100% in 49 minutes, and owners back it up — a 3-month owner thread reports the AC full charge at “just under an hour.”
The DELTA 2 charges at 1,200W over X-Stream. Its page headlines “ready in just 50 mins” without defining the percentage and publishes no 0-100% time — so the only verified full-charge number here belongs to Anker.
On solar, the C1000 Gen 2 accepts 600W max and refills fully in 1.8 hours; the DELTA 2 accepts 500W max, with EcoFlow listing 3-6 hours to full — and a Delta 2 owner with the expansion battery reports solar input as the limiting factor for a battery of this size.
Winner: Anker SOLIX C1000 Gen 2, on the strength of the only verified 0-100% figure here.
Ports and connectivity
The DELTA 2’s port list runs long: 6 AC outlets, 2x USB-C at 100W, 2x USB-A at 12W, 2x USB-A fast at 18W, a 126W car socket, and 2x DC5521 at 38W — 15 in all by the spec list. The C1000 Gen 2 carries 10: just 3 AC outlets, 2x USB-C with one at 140W max, a 12W USB-A, and a 12V/10A car socket at 120W; USB-C1 and USB-A share a 20W combined cap.
Six AC outlets wins for home-office and outage setups — fridge, router, modem, and lamp plugged in with no power strip; the 140W USB-C port wins for laptop-heavy users. For campsites, our camping picks go deeper on port layout and packability.
Winner: EcoFlow DELTA 2 for outlet count and total ports; the C1000 Gen 2 takes it if your load list is mostly USB-C.
App and monitoring
Anker’s app comes out of the 3-month owner thread as stable. One owner reports the front 140W USB-C port intermittently stopping phone charging across different cables and devices. EcoFlow’s app is described by owners as good and consistent, with granular control. The friction on the EcoFlow side is support, not software — slow resolution after problem units recurs as a complaint in owner communities, and neither brand’s community is friction-free.
Winner: Tie — Anker for app stability, EcoFlow for app depth.
Warranty and value
Both carry 5-year warranties and LFP chemistry; the C1000 Gen 2 is rated 4,000 cycles to 80% capacity, the DELTA 2 at 3,000 cycles to 80+%.
On value, check current price on the Anker SOLIX C1000 Gen 2 and the EcoFlow DELTA 2 rather than trusting a number in an article — both lines cycle through discounts, and Black Friday historically brings meaningful cuts.
The generation angle is the part most shoppers miss: superseded in the US lineup by the DELTA 3, the DELTA 2 is often the deal pick — last generation at a discount, with 6 outlets and an expansion path — while the current C1000 Gen 2 rarely drops as hard. If you want the newest Delta instead, the DELTA 3 adds 3,600W surge, 4,000 cycles, a 56-minute full charge, and ~5kWh of expansion ceiling. For broader comparison shopping, see our home backup picks.
Winner: Anker SOLIX C1000 Gen 2 on rated longevity, with the DELTA 2 as the value play if you catch a discount and want expansion.
Buy the C1000 Gen 2 if…
- You want 2,000W continuous and 3,000W surge from a 24.9 lb unit.
- Fast recharge matters — 0-100% in 49 minutes is the only verified full-charge figure here.
- You are running CPAP, a router, or a fridge at a fixed 1kWh.
- You want the longer rated battery life: 4,000 cycles versus 3,000.
Buy the DELTA 2 if…
- You need 6 AC outlets without a power strip.
- You want to expand to 2,048Wh or 3,072Wh later, extra-battery stock permitting.
- X-Boost’s 2,200W mode covers a resistive load you actually own.
- You find it discounted as the outgoing generation.
FAQ
The four questions buyers ask most — is the C1000 discontinued, can either unit expand, fridge and CPAP runtime, Delta 2 or Delta 3 — are answered at the top of this page.
For the wider brand picture, see our Anker vs EcoFlow deep dive; if the fridge is your deciding load, the refrigerator runtime picks rank the units that hold up overnight.
Frequently asked questions
Is the Anker SOLIX C1000 discontinued?
The original 1,056Wh C1000 is sold out on Anker's own store, where the page shows only a Notify Me button, so treat it as discontinued unless you find leftover third-party stock. The 1,024Wh C1000 Gen 2 is the current version and is actively sold with bundles.
Can you expand the C1000 or the Delta 2 with extra batteries?
The C1000 Gen 2 cannot be expanded at all — Anker's product page states it does not include an expansion feature, and owners in a 3-month owner thread list that as their main gripe. The EcoFlow DELTA 2 supports one DELTA 2 extra battery for 2,048Wh or a DELTA Max battery for 3,072Wh, but EcoFlow's Canadian store now marks the extra battery no longer available, so check availability before you plan around it.
How long will a C1000 or Delta 2 run a fridge or CPAP machine?
Both units hold 1,024Wh, so using a 0.85 inverter-loss factor, a CPAP at 50W runs about 17.4 hours (1,024 x 0.85 / 50 = 17.4) and a mini fridge averaging 60W runs about 14.5 hours (1,024 x 0.85 / 60 = 14.5). If you add a DELTA 2 extra battery for 2,048Wh, the fridge number stretches to about 29 hours (2,048 x 0.85 / 60 = 29).
Should I buy the Delta 2 or the newer Delta 3?
The DELTA 3 is what us.ecoflow.com now serves at the old Delta 2 URL, and on paper it is the stronger machine: 3,600W surge versus 2,700W, a 1,500W AC charge to full in 56 minutes versus an undefined full-charge claim, 4,000 cycles versus 3,000, and expansion to roughly 5kWh. The DELTA 2 stays relevant as the deal pick at US retail — check current price on both before deciding.