On this pageSpecs Everyday household outage backup Grow-it-later backup Van life & vehicle use Motor-start & inductive loads CPAP & medical overnight backup

EcoFlow DELTA 3vsAnker SOLIX C1000 Gen 2 (2026)

These two share the same 1,024 Wh LiFePO₄ battery, the same 4,000-cycle lifespan, the same sub-10 ms UPS switchover, the same 5-year warranty, and both recharge from the wall in under an hour. They sit within twenty dollars of each other and their cost-per-watt-hour is effectively tied. On paper they look interchangeable, so the verdict never simplifies to one being better across the board — it forks on how you’ll actually use it. Five distinct buyer situations split them cleanly, and the same unit doesn’t win them all.

EcoFlow DELTA 3

$519 ($0.51/Wh)

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Prices and availability change frequently

Anker SOLIX C1000 Gen 2

$500 ($0.49/Wh)

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Prices and availability change frequently

Spec	EcoFlow DELTA 3	Anker SOLIX C1000 Gen 2
Battery Capacity	1,024 Wh	1,024 Wh
Chemistry / Cycle Life	LiFePO₄ · 4,000 cycles to 80%	LiFePO₄ · 4,000 cycles to 80%
Rated Output	1,800 W	2,000 W
Surge	3,600 W	3,000 W
Weight	27.6 lbs	24.9 lbs
AC Recharge Time	≈54–56 min measured	≈46–47 min measured
Solar Recharge Time	≈4 hr from 200 W	≈5–6 hr from 200 W*
Total Ports	13 (incl. 6 AC outlets, 2×USB-C 100 W, 12 V car output)	10 (incl. 1×USB-C 140 W)
Max Solar Input	500 W (11–60 V)	600 W (11–60 V MPPT)*
Expandable	Yes (to ≈2 kWh practical†)	No (port removed on Gen 2)
UPS Switchover	Sub-10 ms	Sub-10 ms
Warranty	5 years	5 years
Price	$519 ($0.51/Wh)	$500 ($0.49/Wh)

* With 11–28 V panels the Anker’s solar input caps near 200 W in practice, and the faster recharge time assumes 29–60 V panels.

Everyday household outage backup

For keeping a fridge, router, lamps, and phone chargers running through multi-hour outages, then topping back up from a generator or wall outlet. You’re fine with 1 kWh and not planning to expand.
The EcoFlow carries 13 total ports including six AC outlets versus the Anker’s 10 total ports, so it runs more devices simultaneously without a power strip. And since home-backup buyers often recharge from a generator near the house, the EcoFlow is quieter during the refill — 32–33 dB at max AC charging versus the Anker’s ≈42 dB in UltraFast charging mode. On usable energy at this mixed-AC regime the EcoFlow also has a real edge: its 90.7% bench inverter efficiency beats the Anker’s measured 83–89% at the wall, so more of the shared 1,024 Wh reaches the load — roughly 900–930 Wh usable versus 870–907 Wh. Its 56-minute wall recharge means short grid-up windows top it off, and expansion remains available if needs grow later.
The Anker is genuinely close and the right pick if your priority flips to 2,000 W of output headroom for one bigger appliance with margin, the 46–47 minute recharge, the lighter 24.9 lb body for moving room to room, or the $19-lower price. None of these lose the segment by much; they just lose the plug-everything-in, recharge-quietly framing that defines the default household buyer.

Grow-it-later backup

You’re buying 1 kWh now but you know one of these outages will run long, and you want the option to bolt on more battery rather than re-buy. Capacity growth is the whole point.
The EcoFlow is expandable; the Anker C1000 Gen 2 is not — Gen 2 deliberately removed the expansion-battery port the Gen 1 had. Between these two, there is no contest. A DELTA 3 Extra Battery roughly doubles capacity to ≈2 kWh, and the LiFePO₄ chemistry with its 5-year warranty supports the daily cycling that a primary-backup role implies.
Important honesty: the registry headline of expandable to 5,000 Wh is misleading. You cannot chain multiple 1 kWh batteries to reach 5 kWh through the standard connection — the only route to the full figure is a single 4 kWh DELTA Pro 3 battery. Realistic, affordable expansion is the ≈2 kWh path via the DELTA 3 Extra Battery. So the EcoFlow wins this segment outright against the Anker, but if scalable storage is genuinely your first priority, both reviews point you to a different unit — Anker’s own C2000 Gen 2, which expands to roughly double — rather than either of these.

Van life & vehicle use

The unit lives in a van, truck, or car, gets carried in and out, and you recharge it on the move — a library, a coffee shop, a small generator, the alternator. Loads are modest: DC cooler, devices, lights, maybe a CPAP. One kilowatt-hour is enough; you’ll refill often.
The Anker is the lighter unit at 24.9 lbs versus 27.6 lbs — our research calls it the lightest, most compact 1 kWh-class unit testers have weighed, genuinely one-hand liftable — and it holds the fastest recharge in the class at 46–47 minutes measured, which is the single most-cited reason its owners pick it for life on the road: dead-to-full is a coffee break. On DC loads the shared 1,024 Wh runs near nameplate for both, so capacity isn’t the tiebreaker; weight and refill speed are, and both favor Anker. Its 600 W solar nameplate supports daytime replenishment, and it pairs with the Anker Alternator Charger for practical vehicle charging since the 12 V car port alone caps near 100 W.
The EcoFlow is only 2.7 lbs heavier and it offers two things the Anker can’t: the expansion option if your rig’s needs grow, and a quieter charge if you refill near where you sleep. It loses here purely on the two axes this segment weights most.
Two caveats to plan around: UltraFast charging needs cell temperature above 68 °F and runs slower in the cold — one owner saw solar charging stall at 41 °F — so cold-weather vanlifers lose part of the recharge edge. And you must complete the initial Bluetooth app pairing at home; off-grid, the outlets may not turn on until it’s paired.

Motor-start & inductive loads

You need to start something with a high inrush — a well pump, a table saw, a shop compressor, or a microwave that’s been finicky on other power stations. Starting the load matters more than running it for hours.
On the spec sheet the Anker looks like the stronger inverter — 2,000 W continuous versus the EcoFlow’s 1,800 W. But the deciding factor isn’t continuous watts; it’s how each unit behaves at the surge instant. The Anker’s SurgePad feature cannot be disabled, so above a 2,000 W draw it drops output voltage to 110 V to stay under its limit, and induction-motor and compressor devices — an 1,800 W table saw, some microwaves — either fail to start or trip out within seconds. Our research documents competitors that let you turn this behavior off; the C1000 Gen 2 does not. The EcoFlow brings the higher surge ceiling at 3,600 W versus 3,000 W and carries no equivalent non-disableable voltage-drop trap on motor-start; our research notes the 1,800 W output handles compressor startup surges such as full-size fridges and deep freezers without trouble.
Honesty caveat in both directions: the EcoFlow is not flawless on sustained sensitive loads — our research reports a 3D printer at a steady 375 W tripping the AC outlet and firmware overheat shutdowns. That’s a different failure mode — continuous sensitive draw, not motor inrush — and doesn’t bear on the brief-surge case this segment weights, but a buyer running a continuous sensitive load should read that flag. Also note X-Boost’s 2,200 W resistive stretch drops voltage below 100 V — fine for a kettle, not for sensitive electronics. For motor-start specifically, the EcoFlow is the better tool of the two.

CPAP & medical overnight backup

The unit’s job is to keep a CPAP or comparable medical device running overnight through an outage, silently, without a hiccup, for one or more nights.
The hardware is a near-tie — both deliver sub-10 ms UPS switchover, both are pure-sine, both run a CPAP for multiple nights when you connect over DC or USB-C direct rather than through the AC inverter. When the specs tie this completely, our research decides on two things: how quiet the unit is at idle beside the bed, and what happens if it fails. The Anker is the quieter unit at idle — under 20 dB below 200 W versus the EcoFlow’s ≈30 dB — which matters for a device that sits on the nightstand. And the failure-consequence axis leans its way: our research flags EcoFlow’s slow, ship-it-back-first warranty process with no US phone line as its single most serious weakness, and explicitly tells medical-dependency buyers to have a backup plan. Anker’s support is split but its Amazon return path resolves faster. Both run a CPAP ≈4 nights on DC or USB-C direct, so runtime doesn’t separate them.
The EcoFlow is very close — identical sub-10 ms UPS, also runs a CPAP multiple nights on DC, and its DC path runs cool and quiet. It loses only on the two thin margins above: slightly louder idle and a worse failure-recovery story.
Critical certainty: our research cautions medical-dependency buyers on both, and the margin between them is genuinely thin. The Anker carries its own gotchas: firmware updates shut the outputs off mid-process — schedule them deliberately — and you must pair it at home before going off-grid or the outlets may not turn on. For a true medical dependency, the correct move is redundancy regardless of which unit you pick — neither a $500 single-battery station should be your only line of defense.

The bottom line

The same unit wins some segments and is demoted in others. That is not a contradiction — it’s the same hardware seen through different weighted axes. The EcoFlow DELTA 3 wins everyday household backup on more simultaneous outlets and quieter recharge, wins grow-it-later backup because the Anker categorically cannot expand, and wins motor-start because its higher surge ceiling and lack of a non-disableable surge-voltage trap outweigh the Anker’s higher continuous-output rating. The Anker SOLIX C1000 Gen 2 wins van life and vehicle use on lighter carry weight and faster recharge speed, and wins CPAP and medical overnight backup narrowly on quieter idle and a faster failure-recovery path. The clean read: the Anker’s strengths are physical — lighter, faster-charging, quieter at rest, higher continuous output — and the EcoFlow’s are systemic — more outlets, expandable, better-behaved on surge, quieter under charge, higher usable AC efficiency. Match the unit to which kind of advantage your situation rewards.

Read the full EcoFlow DELTA 3 review Read the full Anker SOLIX C1000 Gen 2 review