Product line comparison

EcoFlowDELTAvsRIVERSeries

RIVER is a battery you carry. DELTA is the first piece of a system you build.

DELTA Series

The place-it-and-leave-it line.

11 models/960–3,072 Wh/91% expandable

RIVER Series

The carry-it-with-one-hand line.

9 models/230–1,196 Wh/44% expandable

Models compared: 2011 + 9
Capacity spanned: 230–3,072Wh
Ranges overlap: 8%of the band
Genuine rivals: 1model pair

Every model in the DELTA and RIVER lines, drawn at true relative size and positioned by capacity from 230 to 3,072 watt-hours.

This compares two entire product lines, not two units. Get the line right and the model almost picks itself. Get it wrong and no amount of comparing model numbers will rescue the decision. Already know the two units you're torn between? Compare two products head-to-head

What each line is for

Two lines, two different jobs

EcoFlow DELTA

DELTA is EcoFlow's mainstream line, and it’s designed around being set down. A DELTA lives on the floor of a van, in a garage next to the chest freezer, or beside a desk as a backstop for a workstation. It expects a real load — several things drawing at once — and it expects to still be there next season, wired to a panel or a second battery.

EcoFlow RIVER

RIVER is the line you pick up with one hand. It’s sized for the things you carry to a place and carry home again: a tent, a photo shoot, a fishing boat, a hotel room with two outlets. A RIVER runs a laptop, a CPAP, camera batteries and a string of lights very well, and it doesn’t ask you to think about installation.

Fig. 1 — EcoFlow's full range. These two lines sit on adjacent rungs — near enough that the choice is real, which is why this comparison exists and a jump of two rungs does not.

The comparability question

Are these two lines even competing?

Before asking which is better, it's worth asking whether they overlap at all.

Most of the time these two lines aren’t competing at all — they barely occupy the same shelf. The overlap is a narrow band at the top of RIVER and the bottom of DELTA, and it’s the only place the choice is genuinely close. Below that band, a DELTA is more machine than the job needs. Above it, a RIVER simply runs out.

The useful question isn’t which line is better but whether your load is one you carry or one you place. If the unit will move between locations every few days, weight decides it and RIVER wins by default. If it will sit somewhere and be plugged into more than one thing, everything DELTA adds starts to matter and RIVER's ceiling starts to bite.

Fig. 2 — Every EcoFlow model in both lines, by capacity and output. The two lines form separate clusters — the narrow band where they touch is the only place the choice is genuinely close.

The short version

These two barely occupy the same shelf — 8% of their capacity ranges overlap, and only 1 pair out of 20 models genuinely competes. For almost the whole range this isn't a close call at all. Pick the wrong one and you won't have bought a slightly worse unit; you'll have bought the wrong kind of thing.

The deep dive

What actually separates them

Five specifications that decide which line fits — and one that doesn't.

Room to grow

Expandability is whether a unit accepts a second battery later. It’s the difference between buying a finished appliance and buying the first component of something larger — and it’s the axis most people discover they cared about a year after purchasing.

DELTA

91%

RIVER

44%

This is the real split between the lines, and it’s much sharper than the capacity difference everyone notices first. Nearly every DELTA takes an expansion battery. Fewer than half of RIVERs do, so a RIVER is usually the whole of what you’ll ever have.

Fig. 3 — How much of each line can grow later. A sealed unit's ceiling is the box you bought; an expandable one lets you defer the capacity decision — which is the axis buyers most often discover they cared about a year on.

Switchover speed

When utility power drops, a unit with UPS passthrough takes over — but not instantly. Under about 10ms almost nothing notices. Around 20ms, most equipment rides through but sensitive gear can blink: a desktop may reboot, some CPAP units will alarm.

DELTA

10ms

RIVER

20ms

DELTA halves the switchover time. If the reason you’re buying is to protect a desktop, a router or a medical device, that’s the specification to buy on, and it points at DELTA as a class rather than at any single model.

Carry weight

Watt-hours per pound is how much energy you get for what you have to lift. It says nothing about total capacity — a dense unit can still be too heavy to move if it’s simply large.

DELTA

39.8 Wh/lb

RIVER

38.2 Wh/lb

The two lines are close on density, which surprises people. DELTA isn’t less efficient per pound; it’s just bigger. What separates them in practice is absolute weight, not how well each pound is used.

Power character

Output divided by capacity describes what kind of tool a unit is. A high ratio means a large inverter on a modest pack — it starts demanding appliances but doesn’t run them long. A low ratio is the opposite: modest draw, sustained for hours.

DELTA

1.17 W/Wh

RIVER

1.05 W/Wh

DELTA carries a meaningfully bigger inverter relative to its pack, which is what lets it start compressors and heating elements that a RIVER will refuse outright. RIVER is tuned for smaller, steadier draws over a long evening.

Fig. 4 — Output per watt-hour, every model, highest first. High bars are burst tools — they start demanding appliances but do not run them long. Low bars are endurance tools. Two units with the same capacity can sit at opposite ends of this chart.

LifespanNo difference

A cycle is one full discharge and recharge. The rating is roughly how many you get before capacity drops to about 80% of new. At daily use, 3,000 cycles is on the order of eight years.

DELTA

3,000

RIVER

3,000

Identical across both lines — same chemistry, same rating. Longevity isn’t a reason to choose one over the other, and any comparison that implies otherwise is inventing a difference. Worth saying plainly, because it removes a variable most shoppers assume is in play.

Balance sheet

What each line is good at, and what it isn't

EcoFlow DELTA

Strengths

Nearly the whole line accepts an expansion battery, so capacity is a decision you can defer
Switchover is fast enough for a desktop or a CPAP as a class, not case-by-case
Roughly double the AC outlets, which matters more than capacity when several things run at once
Inverter headroom to start compressors and heating elements outright

Limits

The smallest DELTA is still a unit you place rather than carry
More capability than a single-appliance job needs, and you carry that in bulk
Expansion batteries are a further purchase, not included capability
Solar connector choices vary across the line — check the model, not the line

EcoFlow RIVER

Strengths

Genuinely one-hand portable — the line is defined by what you can carry
More surge headroom relative to its rated output than the DELTA line
Simplest way into the EcoFlow ecosystem and its solar connectors
Same cells and same cycle rating as DELTA, so nothing is given up on longevity

Limits

Over half the line accepts no expansion battery, so its capacity is its ceiling
Switchover is roughly twice DELTA's, which is fine for most gear but not all
Fewer AC outlets — enough for a couple of devices, not a working circuit
Tops out well below where DELTA starts to get interesting

How to read this

A limit isn't a fault — it's a constraint on what a line is built to do. Every line here has them, including whichever one suits you. The useful question is which set of limits you'll never notice.

The contested band

Where the lines actually collide

Models within 15% of each other on capacity — and whether they're truly interchangeable.

DELTA 3 1000 Air vs RIVER 3 MAX PLUS

960 Wh / 500 W · 858 Wh / 600 W

Genuine alternatives

See the head-to-head

DELTA 2 vs RIVER 3 MAX PLUS WIRELESS

1,024 Wh / 1,800 W · 1,196 Wh / 600 W

Identical figures for DELTA 3 Classic, DELTA 3 Plus, DELTA 3

Same energy, different job

See the head-to-head

The verdict

So which one should you buy?

Nobody actually buys a spec sheet. Find the row that sounds most like your life — that's the line we'd point you at, and why.

Tent camping, photography, a weekend away

You’ll carry it more than you use it. Weight is the whole decision.

RIVER

CPAP through a power cut

Switchover speed is the specification that matters, and DELTA is reliably fast enough across the line.

DELTA

Keeping a fridge or freezer alive

Compressor startup needs inverter headroom a RIVER won’t provide.

DELTA

Van or overland build you’ll grow

Expandability is the axis you’ll care about in a year, and it’s where the lines diverge most.

DELTA

Laptop, phones, lights for an evening

A steady low draw is exactly what RIVER is tuned for. A DELTA is bulk you’d carry for nothing.

RIVER

Another way in

Or start from the job instead

If you already know what you need it to do, these rank models for that job across every brand we track — not just these two lines.

Best UPS power stations Best power stations for camping Best budget power stations Best power stations for CPAP

The full lineups

Every model, if you want to see the whole range

DELTA · 11 models

Model	Wh	W	lb	Exp.
DELTA 3 1000 Air	960	500	22.0	—
DELTA 2out of stock	1,024	1,800	27.0	Yes
DELTA 3 Classic	1,024	1,800	26.7	Yes
DELTA 3 Plus	1,024	1,800	27.0	Yes
DELTA 3	1,024	1,800	27.0	Yes
DELTA 3 1500out of stock	1,536	1,800	36.0	Yes
DELTA 3 Max	2,048	2,400	50.7	Yes
DELTA 3 Max Plus	2,048	3,000	50.7	Yes
DELTA 2 Max	2,048	2,400	50.7	Yes
DELTA 3 Ultra	3,072	3,600	77.2	Yes
DELTA 3 Ultra Plus	3,072	3,600	77.2	Yes

RIVER · 9 models

Model	Wh	W	lb	Exp.
RIVER 3 230	230	300	7.8	—
RIVER 3out of stock	245	300	7.8	—
RIVER 2	256	300	7.8	—
RIVER 3 PLUS	286	600	10.4	Yes
RIVER 2 Maxout of stock	512	500	13.4	—
RIVER 3 MAX	572	600	10.4	Yes
RIVER 2 Pro	768	800	17.2	—
RIVER 3 MAX PLUS	858	600	20.8	Yes
RIVER 3 MAX PLUS WIRELESSout of stock	1,196	600	20.8	Yes

Common questions

EcoFlow DELTA vs RIVER series FAQs

What is the difference between the EcoFlow RIVER and DELTA series?

RIVER is the portable line, built to be carried with one hand and to run smaller, steadier loads. DELTA is the line you place and leave: a larger inverter for demanding appliances, roughly double the AC outlets, faster UPS switchover, and expansion batteries across nearly the whole range. Both use the same battery chemistry with the same cycle rating, so the choice is about the job, not about longevity.

Is a DELTA just a bigger RIVER?

No — and capacity is the least interesting difference between them. The bigger changes are structural: nearly every DELTA accepts an expansion battery where most RIVERs don’t, DELTA switches over to battery roughly twice as fast during an outage, and it carries about double the AC outlets. A DELTA is designed to become part of a larger setup; a RIVER is designed to be complete on its own.

Can a RIVER run a refrigerator?

Usually not well. A fridge draws a brief surge several times its running wattage when the compressor starts, and the RIVER line carries a smaller inverter relative to its pack. Some larger RIVER models will start an efficient compact fridge, but this is the load that most clearly points at DELTA instead.

Which line is better for a CPAP?

Either can run a CPAP, but if you want it to carry through a power cut without the machine noticing, switchover speed decides it. DELTA switches over roughly twice as fast as RIVER and is safe for that use across the line, where RIVER is model-by-model. For travel where you unplug and run from the battery deliberately, a RIVER is the lighter choice.

Do RIVER and DELTA use the same battery?

They use the same chemistry with the same cycle rating, so expected lifespan is effectively identical between the lines. What differs is what surrounds the cells — inverter size, outlet count, switchover speed and whether the unit accepts an expansion battery.

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Figures are generated from our catalog of 123 power stations and refresh with it — line-level values are medians across every model in the line. See how we test and score.