EcoFlow vs Anker SOLIX: Which Brand?

Both brands sell speed. Where they differ is what happens when one unit stops being enough, and that is the part worth deciding before you buy the first one.

By Sawyer V.Updated September 27, 2026Published September 27, 2026How we work this out

Watt & Warden earns a commission on qualifying purchases made through links on this page, at no extra cost to you. It never changes a ranking, and our picks include products we tell you to skip. Full disclosure.

Quick picks

#	Product	Best for	Price
1	EcoFlow's answer at 1kWh EcoFlow DELTA 3 1,024Wh expandable to 5kWh, 1,800W continuous with 3,600W surge and X-Boost to 2,200W.	Starting small and growing	$629.00 · Check price on Amazon #ad how this is funded · price as of October 21, 2026 · $699.00 10% off
2	Anker's answer at 1kWh Anker SOLIX C1000 1,056Wh with 1,800W continuous, 2,400W SurgePad and a 58-minute full recharge.	The fastest refill in the class	$499.99 · Check price on Amazon #ad how this is funded · price as of October 21, 2026 · $599.99 17% off
3	EcoFlow at 2kWh EcoFlow DELTA 2 Max 2,048Wh, 2,400W continuous, 0-80% in 43 minutes and up to 1,000W of solar.	Flickering outages and solar charging	$1,049.00 · Check price on Amazon #ad how this is funded · price as of October 21, 2026 · $1,399.00 25% off
4	Anker at the top Anker SOLIX F3800 3,840Wh with 6,000W of 120/240V split-phase output, expandable to 26.9kWh.	240V loads from a portable	$1,759.99 · Check price on Amazon #ad how this is funded · price as of October 21, 2026
5	EcoFlow at the top EcoFlow DELTA Pro 3 4,096Wh, 4,000W at 120V/240V, expandable from 4kWh to 48kWh with 2,600W of solar.	240V with the largest expansion ceiling	$2,799.00 · Check price on Amazon #ad how this is funded · price as of October 21, 2026 · $3,699.00 24% off

Prices come from the retailer at page-build time and change constantly. Where no live price is available the button reads “Check price” rather than showing a number we cannot stand behind.

The short answer

EcoFlow if you want to start at one size and grow, if solar input matters, or if X-Boost's headroom for heaters and kettles is useful to you.

Anker SOLIX if you want the fastest wall recharge at 1kWh, the largest continuous output at the top of the range, or the simplest path to 240V split-phase power.

Tier by tier, on published numbers

Tier	EcoFlow	Anker SOLIX	The difference that matters
Small	RIVER 3 Max — 572Wh, 990W	Power banks rather than stations	EcoFlow, on having a product here
1kWh	DELTA 3 — 1,024Wh, 1,800W, to 5kWh	C1000 — 1,056Wh, 1,800W, full in 58 min	Expandability against recharge speed
2kWh	DELTA 2 Max — 2,048Wh, 2,400W, 1,000W solar	Not covered on this site	EcoFlow, on solar input
240V split-phase	DELTA Pro 3 — 4,096Wh, 4,000W, to 48kWh	F3800 — 3,840Wh, 6,000W, to 26.9kWh	Anker on output, EcoFlow on expansion ceiling

Manufacturer figures from the pages cited below. Tiers marked "not covered on this site" mean we carry no unit from that brand at that size, not that the brand has nothing.

What each brand optimizes

EcoFlow builds systems. Nearly every unit in the range accepts extra batteries, the solar ceilings are the highest in each class, and the app ecosystem ties it together. The design assumption is that your requirement will grow.

Anker builds units. The individual machine is the product: fastest recharge at 1kWh, most continuous output at the top, and a split-phase portable that needs no companion hardware to make 240V. Expansion exists on the big units but it is not the organizing idea.

Three places the difference bites

1. Kettles, heaters and X-Boost

EcoFlow's X-Boost runs resistive loads above the inverter's rating by reducing voltage. For a 1,500W kettle on an 1,800W unit that is real headroom. It does nothing for a compressor, a pump or anything with a motor, so do not size those against it.

2. Surge, and starting motors

Anker publishes SurgePad headroom above its continuous rating, which is what a refrigerator or sump pump needs at the instant it starts. The starting-watts page explains why that number, not capacity, decides what will run.

3. The 240V wall

Both brands cross it at the top of their ranges, which is unusual — most makers do not. If a well pump, a range or a hardwired 240V circuit is on your list, this is the tier to compare, and the choice is between Anker's higher output and EcoFlow's larger expansion ceiling.

What both do well

LiFePO4 throughout. Both have moved their mainstream ranges to LFP cells — the chemistry page explains why that matters.
Fast wall charging. Both treat recharge speed as a headline feature, which is the specification that wins flickering outages.
Published specifications. Capacity, output, surge, cycles and charge times are all stated on both brands' product pages.

The short version

At 1kWh they are nearly identical on paper. Choose expandability (EcoFlow) or recharge speed (Anker).
EcoFlow wins on solar input and expansion ceilings.
Anker wins on continuous output at the top — 6,000W against 4,000W.
Both make 240V at the top of the range, which most brands never do.

The picks in full

01 — EcoFlow's answer at 1kWh

EcoFlow DELTA 3

1,024Wh expandable to 5kWh, 1,800W continuous with 3,600W surge and X-Boost to 2,200W.

Expandability is EcoFlow's structural advantage: the same unit can grow to 5kWh with extra batteries, which turns a purchase decision into a sequence of them.

X-Boost is the other feature Anker does not match — it runs resistive loads above the inverter rating by lowering voltage, which covers kettles and heaters.

The honest catch: X-Boost does nothing for motors, and expansion batteries are close to the price of a second complete unit.

Skip it ifyou know your final capacity today. Expansion costs more than buying it outright.

$629.00 · Check price on Amazon

#ad how this is funded · price as of October 21, 2026 · $699.00 10% off

Published specifications for the EcoFlow DELTA 3
Specification	Published figure
Usable capacity	1,024 Wh, expandable to 5 kWh
Cell chemistry	LiFePO4 (LFP)
AC output	1,800 W continuous / 3,600 W surge
X-Boost output	2,200 W for resistive loads
Cycle life	4,000 cycles to 80%+
AC recharge	Full in 56 minutes at 1,500 W input
Max solar input	500 W
Weight	27.6 lb (12.5 kg)
Outlets	13 total
Warranty	5 years

Source: EcoFlow — DELTA 3 product specifications. These are the manufacturer's published figures, not ours — we have not tested this unit.

02 — Anker's answer at 1kWh

Anker SOLIX C1000

1,056Wh with 1,800W continuous, 2,400W SurgePad and a 58-minute full recharge.

Near-identical capacity and the same inverter rating, with a full recharge in under an hour and 600W of solar input.

SurgePad covers the inrush when a compressor or pump starts, which is the practical limit on what a 1,800W unit can run.

The honest catch: 3,000 published cycles is the shorter rating of the two, and there is no expansion path.

Skip it ifyou may want more capacity later. This unit does not expand.

$499.99 · Check price on Amazon

#ad how this is funded · price as of October 21, 2026 · $599.99 17% off

Published specifications for the Anker SOLIX C1000
Specification	Published figure
Usable capacity	1,056 Wh
Cell chemistry	LiFePO4 (LFP)
AC output	1,800 W continuous / 2,400 W SurgePad
Cycle life	3,000 cycles
Wall recharge	80% in 43 min, full in 58 min
Max solar input	600 W (full solar recharge ~1.8 h)
Ports	11 total, including 6 AC on panel-equipped bundles

Source: Anker — SOLIX C1000 product specifications. These are the manufacturer's published figures, not ours — we have not tested this unit.

03 — EcoFlow at 2kWh

EcoFlow DELTA 2 Max

2,048Wh, 2,400W continuous, 0-80% in 43 minutes and up to 1,000W of solar.

The 1,000W solar ceiling is the class leader and the reason this unit suits off-grid charging rather than only wall charging.

43 minutes to 80% is also the quickest refill at this size — reviewed in full here.

The honest catch: expansion adds hours, not watts. Output stays at 2,400W however many batteries you add.

Skip it ifcycle life is your priority. 3,000+ cycles is normal rather than exceptional.

$1,049.00 · Check price on Amazon

#ad how this is funded · price as of October 21, 2026 · $1,399.00 25% off

Published specifications for the EcoFlow DELTA 2 Max
Specification	Published figure
Capacity	2,048 Wh, expandable to 6,144 Wh
Output	2,400 W continuous
Chemistry	LiFePO4, 3,000+ cycles to 80%
AC recharge	0–80% in 43 minutes
Solar input	up to 1,000 W
Outlets	15 total
Noise	as low as 30 dB

Source: EcoFlow — DELTA 2 Max published specifications. These are the manufacturer's published figures, not ours — we have not tested this unit.

04 — Anker at the top

Anker SOLIX F3800

3,840Wh with 6,000W of 120/240V split-phase output, expandable to 26.9kWh.

Split-phase 120/240V from a single box is the capability that separates the top of Anker's range from most portables — the full review covers who needs it.

6,000W continuous also clears loads no 1kWh or 2kWh unit approaches.

The honest catch: 132.3 lb and a price several times the 1kWh class.

Skip it ifeverything you own runs on 120V.

$1,759.99 · Check price on Amazon

#ad how this is funded · price as of October 21, 2026

Published specifications for the Anker SOLIX F3800
Specification	Published figure
Capacity	3,840 Wh
Cell chemistry	LiFePO4
AC output	6,000 W continuous, 9,000 W surge
Voltage	120V / 240V split-phase
Cycle life	3,000+ cycles to 80% capacity
Recharge	1,800 W AC, up to 2,400 W solar
Expansion	Up to six expansion batteries, 26.9 kWh total
Warranty	5 years
Current Amazon listing	Renewed. Anker's new first-party F3800 listing is currently unavailable and the model has been succeeded by the F3800 Plus; the unit itself is unchanged

Source: Anker SOLIX — F3800 product specifications. These are the manufacturer's published figures, not ours — we have not tested this unit.

05 — EcoFlow at the top

EcoFlow DELTA Pro 3

4,096Wh, 4,000W at 120V/240V, expandable from 4kWh to 48kWh with 2,600W of solar.

EcoFlow answers the F3800 with more capacity per unit and a far higher expansion ceiling — 48kWh is home-battery territory.

2,600W of solar input makes it credible as an energy system rather than a battery you plug in.

The honest catch: 4,000W continuous against the F3800's 6,000W, and every expansion battery is another full-price purchase.

Skip it ifyou want the highest continuous output. Anker's F3800 publishes more.

$2,799.00 · Check price on Amazon

#ad how this is funded · price as of October 21, 2026 · $3,699.00 24% off

Published specifications for the EcoFlow DELTA Pro 3
Specification	Published figure
Capacity	4,096 Wh
Cell chemistry	LiFePO4 (LFP)
AC output	4,000 W, 120V / 240V
Cycle life	4,000+ cycles to 80% capacity
Wall recharge	0-80% in about 1 hour
Max solar input	2,600 W
Expansion	4 kWh to 48 kWh

Source: EcoFlow — DELTA Pro 3 product listing. These are the manufacturer's published figures, not ours — we have not tested this unit.

How these were chosen

We did not test these. Nobody at Watt & Warden has plugged one in. What we did instead: read the manufacturer's published specifications, compile them into a table where the figures line up, and compute the numbers manufacturers leave out — runtime against a real appliance load, and what an hour of running actually costs.

Anything that could not be sourced was left out rather than estimated, and every pick names the buyer who should skip it. The full method is here, including where it is weaker than a publisher with a test bench.

Questions people actually ask

Is EcoFlow or Anker SOLIX better?

Neither across the board. At 1kWh the two are nearly identical on capacity and inverter rating, and the choice is between EcoFlow's expandability to 5kWh and Anker's 58-minute full recharge. At the top of the range Anker publishes more continuous output (6,000W) while EcoFlow publishes a much larger expansion ceiling (48kWh).

Which brand is better for home backup?

EcoFlow if you expect your requirement to grow or you charge from solar, because of the expansion path and the higher solar input ceilings. Anker if you want the fastest refill between outages or you need 120/240V split-phase power from a single box for a well pump or a hardwired circuit.

What is X-Boost and is it the same as surge headroom?

No. X-Boost is EcoFlow's mode for running resistive loads -- kettles, heaters, toasters -- above the inverter's continuous rating by reducing voltage. Surge headroom, such as Anker's SurgePad, covers the brief inrush when a motor or compressor starts. X-Boost does not help motors.

Do both brands make a 240V portable?

Yes, at the top of their ranges: Anker's F3800 produces 120/240V split-phase at 6,000W, and EcoFlow's DELTA Pro 3 does so at 4,000W. Most portable power station brands do not offer this at all, so if 240V is a requirement these two are the obvious places to look.

Is an expansion battery cheaper than a second unit?

Usually not by much, and it buys something different. An expansion battery adds hours under the same inverter; a second complete unit adds a second inverter, a second set of outlets and power in two places at once. Compare live prices for both before deciding.

Sources

Every figure on this page comes from a published source. We have not tested this equipment, so the specifications are the manufacturer's and the statistics are the dataset's — the arithmetic on top of them is ours, and it is shown in full so you can check it. How we work this out.