Brand Hub

EcoFlow Power Stations 2026: Every RIVER and DELTA Model Explained

Q: RIVER or DELTA: which EcoFlow line do I need?

Pick by load, not by brand tier. RIVER units are 256Wh to 768Wh portables for camping, CPAP and device charging, and short essentials coverage: the RIVER 2 starts at 256Wh/300W, the RIVER 2 Max at 512Wh/500W, and the RIVER 2 Pro at 768Wh/800W. DELTA units start at 1,024Wh/1,800W and are the home-essentials class: refrigerators, microwave circuits, sump pumps, and tool-grade loads. The honest divider: if the appliance you care about is a refrigerator or anything with a motor, you are shopping DELTA; if it is a phone bag, a CPAP, or a camp kitchen, RIVER is enough.

Q: Can an EcoFlow DELTA run a refrigerator?

On watts, every DELTA can: a modern refrigerator's compressor-start surge sits well inside the 1,800W of continuous output and 3,600W of surge headroom on the DELTA 2 and DELTA 3 class. On energy is where models separate: our fridge-backup review uses 1.0-1.5 kWh per day for a modern 18 cu-ft refrigerator, so a 1,024Wh DELTA covers most of a day, and 2-3kWh configurations cover a multi-day outage. For permanent, automatic fridge backup specifically, see our Bluetti FridgePower review: that product's 10ms UPS and slim chassis exist exactly for this job.

Q: How does EcoFlow expansion actually work?

Each platform has a verified ceiling and you buy toward it, not past it. DELTA 2 expands to 3kWh; DELTA 3 Plus to 5kWh via DELTA extra batteries; DELTA 3 Ultra/Ultra Plus to roughly 11kWh with expansion packs; DELTA Pro to 25kWh; and DELTA Pro Ultra to 90kWh, which is whole-home territory. Expansion batteries only pair within their own platform family, so choose the platform whose ceiling matches your worst realistic outage, then add packs as budget allows.

Q: What does X-Boost actually do?

X-Boost lets a unit run appliances above its rated AC output by boosting wattage at the cost of performance on the appliance: the RIVER 2 is a 300W inverter that X-Boosts to 600W, the RIVER 2 Pro an 800W unit that X-Boosts with 1,600W of surge, the DELTA 2 an 1,800W unit that X-Boosts to 2,200W, the DELTA 3 Plus an 1,800W unit with 2,200W X-Boost, and the DELTA 3 Ultra 3,600W with X-Boost to 4,600W, with EcoFlow noting the DELTA 3's X-Boost runs 2,600W+ appliances. The honest caveats: resistance heaters and similar loads run but heat more slowly, and surge-heavy motor starts can still trip the unit, so check the appliance's own surge figure against the unit's surge rating, not just X-Boost.

Q: What is the EcoFlow warranty, and how long do the batteries last?

Five years is the verified standard across the rows we could source it for: RIVER 2, RIVER 2 Pro, DELTA 2, DELTA Pro 3, and DELTA Pro Ultra. The chemistry is LFP across the ladder, rated around 3,000 cycles on the RIVER 2 class (which EcoFlow frames as roughly 10 years of use) and 4,000 cycles on the DELTA 3 Plus. Where we could not verify a warranty term for a specific model, the table says so rather than guessing; confirm the term on the product page at purchase time.

Q: Which EcoFlow should I buy for CPAP or camping?

Our solar generator sizing review budgets a CPAP at about 60W for 8 hours, or roughly 480Wh per night. That rules out the 256Wh RIVER 2 for anything beyond a partial night, makes the 512Wh RIVER 2 Max a one-night unit with a little headroom, and makes the 768Wh RIVER 2 Pro about a night and a half of CPAP, or one full night with phones and lights sharing the pack. For camping where the station also runs a cooler or cooking gear, step to a DELTA and accept the weight. All three RIVER units recharge fast from the wall (the RIVER 2 in about 60 minutes, the RIVER 2 Pro in about 70), which matters on multi-day trips with outlet access.

Q: Why do prices for the same EcoFlow model vary so much?

Because EcoFlow's street pricing moves constantly and we only print dated, sourced figures. The DELTA 3 Ultra Plus launched at a $2,899 MSRP in January 2026 and Digital Trends tracked street pricing of $1,499-$1,599 by July 2026, noting $1,499 looks to be the new permanent price; CNET separately tracked a $2,599 to $1,599 deal in July 2026. That is a near-halving inside seven months, which is why our price-per-Wh ladder carries a date and a source on every row and why we never print an undated price. Check current pricing at the retailer before buying anything on this page.

EcoFlow is the most-tested brand in GearLab's 14-station comparison (the DELTA Pro 3, DELTA 3, and RIVER 2 Pro all went through it), and its lineup spans everything from a 256Wh camping brick to a 90kWh whole-home stack. That breadth is exactly why it confuses buyers. This hub lays out the full RIVER and DELTA ladder on verified specs, explains what X-Boost and the UPS column actually mean, and prices the field in a dated price-per-Wh ladder so you can see what a watt-hour costs this year. Where a number is not verified, we print "not verified" instead of a guess.

September 21, 2026•Specs verified against listed sources

The ladder: capacity to output

EcoFlow's range reads cleanly as a ladder: RIVER units carry 256Wh to 768Wh and inverter outputs of 300W to 800W; the DELTA 2 and DELTA 3 class carries 1,024Wh at 1,800W; the DELTA 3 Ultra and DELTA Pro class steps to 3,072Wh to 4,096Wh at 3,600W to 4,000W; and the DELTA Pro Ultra starts at 6,144Wh with 7,200W. Every rung below carries its source. The UPS column marks where sub-10ms switchover is verified; a dash means we did not find a verified figure for that model, not that it lacks the feature.

Model	Capacity	Output	X-Boost	UPS	Expandable to	Warranty	Verified notes and source
RIVER 2	256Wh	300W	X-Boost 600W	-	-	5-yr	LFP, 3,000 cycles; 0-100% AC in 60 min. [EcoFlow CA product page + ecoflow.com FAQ]
RIVER 2 Max	512Wh	500W	X-Boost 1,000W	-	-	not verified	LFP. [EcoFlow FAQ]
RIVER 2 Pro	768Wh	800W	X-Boost 1,600W surge	-	-	5-yr	LFP, 3,000 cycles (~10 yrs per EcoFlow); 0-100% in 70 min; TÜV Rheinland safety certified. [us.ecoflow.com, verified 2026-09-21]
DELTA 2	1,024Wh	1,800W	X-Boost 2,200W	-	3kWh	5-yr	500W solar; 0-80% in 50 min; 3,000+ cycles. [our solar generators dataset, sourced from ecoflow.com]
DELTA 3	1,024Wh	1,800W (3,600W surge)	X-Boost runs 2,600W+ appliances	-	not verified	not verified	Sale $499 (29% off) Feb 2026. [EcoFlow DELTA 3 series page; popsci]
DELTA 3 Plus	1,024Wh	1,800W (3,600W surge)	X-Boost 2,200W	<10ms	5kWh via DELTA EB	not verified	LFP 4,000 cycles; 13 ports; 1,500W AC charge; 500W solar; IP65 battery; 12.5 kg / 27.6 lb; $649 at review time. [StorageReview review, 2025-01-02]
DELTA 3 Ultra / Ultra Plus	3,072Wh	3,600W (7,200W surge)	X-Boost 4,600W	<10ms	~11kWh with packs	not verified	LFP; MSRP $2,899, released Jan 2026; street $1,499-$1,599 July 2026. [Digital Trends, 2026-07-01]
DELTA Pro	3,600Wh	3,600W	-	-	25kWh	not verified	240V pairing. [Digital Trends comparison]; list $3,699 [GearLab]
DELTA Pro 3	4,096Wh	4,000W	-	not verified	not verified	5-yr	Native 240V; 2,600W solar. [solargenreview] GearLab Top Pick 'Best for Home Backup', 81/100, list $3,699, measured 3,790Wh delivered, 4,000W measured, 51.8 kg, 1,293 Wh/hr charge rate. [GearLab measured data]
DELTA Pro Ultra	6,144Wh	7,200W (120/240V)	-	not verified	90kWh	5-yr	5.6-16.8kW solar; IP54. [our solar generators dataset, sourced from us.ecoflow.com]

Rows cite EcoFlow product pages, the ecoflow.com FAQ, our own sourced solar generators dataset, Digital Trends, StorageReview, GearLab, solargenreview, and popsci. A dash or "not verified" means exactly that: we found no source we trust for the field, so we print nothing rather than something.

The dated price-per-Wh ladder

Price per nameplate watt-hour is the fastest honest comparison across brands, and EcoFlow's own spread is enormous: the same hardware class has sold at $0.37/Wh and $0.94/Wh within one year. Every row below is dated to its source, because an undated price in this market is marketing. Where we have no verified price for a model, it simply does not appear here.

Model	Dated price	Capacity	$/Wh	Source
DELTA 3 Max	$749 sale (Feb 2026)	2,048Wh	$0.37/Wh	popsci
DELTA 3	$499 sale (Feb 2026)	1,024Wh	$0.49/Wh	popsci
DELTA 3 Ultra Plus	$1,499 street (July 2026)	3,072Wh	$0.49/Wh	Digital Trends (vs $0.94/Wh at $2,899 MSRP)
DELTA 3 Plus	$649 (Jan 2025, review time)	1,024Wh	$0.63/Wh	StorageReview
DELTA Pro 3	$3,699 list	4,096Wh	$0.90/Wh	GearLab

For all other models, list pricing is not verified and we will not print one. The DELTA 3 Ultra Plus also has a CNET-tracked deal on record: $2,599 falling to $1,599 in July 2026, consistent with Digital Trends' street range.

Where to buy

Outbound links go to the manufacturer or a retailer; see the disclosure above and our monetization page.

RIVER 2 Pro

768Wh / 800W, TÜV certified

Check price at EcoFlow

DELTA 2

1,024Wh / 1,800W, expandable to 3kWh

Check price at Amazon

DELTA 3 Plus

1,024Wh / 1,800W, UPS under 10ms

Check price at EcoFlow

DELTA 3 Ultra Plus

3,072Wh / 3,600W, to ~11kWh

Check price at EcoFlow

DELTA Pro 3

4,096Wh / 4,000W, native 240V

Check price at EcoFlow

We may earn a commission when you buy through links on this page. Details

The four series, in plain terms

RIVER (256-768Wh): the portables. Camping, CPAP, device bags, and van-life budgets. They charge absurdly fast for their size (the RIVER 2 hits 100% from an AC outlet in about 60 minutes) and their X-Boost ratings let a 300W unit run a 600W-class appliance at reduced performance. They are not refrigerator insurance.

DELTA 2 and DELTA 3 (1-2kWh): the home-essentials class. 1,800W of continuous output runs refrigerators, microwave circuits, and tool loads; the DELTA 2 is expandable to 3kWh and the DELTA 3 Plus to 5kWh. This is where most households should start, and where our solar generator review compares EcoFlow against Jackery, Bluetti, Anker, and the rest.

DELTA 3 Ultra and DELTA Pro (3-4kWh+): real home backup. The Ultra's 3,072Wh at 3,600W (7,200W surge) expands to roughly 11kWh; our DELTA 3 Ultra review covers the base unit and the expandable Ultra Plus in depth, with measured charge and efficiency data and the over-paneling safety caveat. The Pro 3's 4,096Wh at 4,000W does native 240V and took GearLab's Top Pick for "Best for Home Backup" at 81/100. GearLab's measured data is the useful part: the Pro 3 delivered 3,790Wh of its 4,096Wh nameplate, held its full 4,000W output in testing, and charged at a measured 1,293 Wh/hr, all at 51.8 kg. Measured-beats-marketing is why we cite it.

DELTA Pro Ultra (6,144Wh base): the whole-home class. 7,200W over 120/240V, expansion to 90kWh, 5.6-16.8kW of solar input, IP54, and a 5-year warranty. At this tier you are comparing against hardwired home batteries rather than portables; our home battery review covers that side, including EcoFlow's own OCEAN Pro.

The ecosystem around the boxes

EcoFlow sells portable solar panels in 110W, 220W, and 400W sizes, extra batteries for the expandable platforms, and a Smart Home Panel that ties DELTA-class units into the house's circuits as a transfer-switch alternative. Describe that ecosystem generically and check compatibility per model before buying: panel input caps vary (500W on the DELTA 2 and DELTA 3 Plus rows above), extra batteries only pair within their platform, and transfer-switch wiring is an electrician job. We do not verify third-party panel compatibility; check the input cap and connector for the specific model before adding panels.

What the UPS column means (and what X-Boost actually does)

A UPS rating means the station sits between the wall and your load, senses an outage, and takes over fast enough that the load never notices. Verified here at under 10ms on the DELTA 3 Plus and the DELTA 3 Ultra class: your refrigerator, router, or CPAP simply keeps running through the blip. Not every model row carries a verified UPS figure and we print the dashes honestly. If zero-interruption fridge backup is the entire goal, our Bluetti FridgePower review covers the product purpose-built for it.

X-Boost is the other commonly misread column. It is not extra continuous output: it is EcoFlow's boost mode that runs appliances above the inverter's rating by trading down performance, with the honest caveat that surge-heavy motor starts can still trip the unit. The table separates base output (W), surge (where verified), and X-Boost precisely because they answer different questions. Size the appliance against base output first, X-Boost second, surge third.

EcoFlow Power Stations: FAQ

RIVER or DELTA: which EcoFlow line do I need?

Pick by load, not by brand tier. RIVER units are 256Wh to 768Wh portables for camping, CPAP and device charging, and short essentials coverage: the RIVER 2 starts at 256Wh/300W, the RIVER 2 Max at 512Wh/500W, and the RIVER 2 Pro at 768Wh/800W. DELTA units start at 1,024Wh/1,800W and are the home-essentials class: refrigerators, microwave circuits, sump pumps, and tool-grade loads. The honest divider: if the appliance you care about is a refrigerator or anything with a motor, you are shopping DELTA; if it is a phone bag, a CPAP, or a camp kitchen, RIVER is enough.

Can an EcoFlow DELTA run a refrigerator?

On watts, every DELTA can: a modern refrigerator's compressor-start surge sits well inside the 1,800W of continuous output and 3,600W of surge headroom on the DELTA 2 and DELTA 3 class. On energy is where models separate: our fridge-backup review uses 1.0-1.5 kWh per day for a modern 18 cu-ft refrigerator, so a 1,024Wh DELTA covers most of a day, and 2-3kWh configurations cover a multi-day outage. For permanent, automatic fridge backup specifically, see our Bluetti FridgePower review: that product's 10ms UPS and slim chassis exist exactly for this job.

How does EcoFlow expansion actually work?

Each platform has a verified ceiling and you buy toward it, not past it. DELTA 2 expands to 3kWh; DELTA 3 Plus to 5kWh via DELTA extra batteries; DELTA 3 Ultra/Ultra Plus to roughly 11kWh with expansion packs; DELTA Pro to 25kWh; and DELTA Pro Ultra to 90kWh, which is whole-home territory. Expansion batteries only pair within their own platform family, so choose the platform whose ceiling matches your worst realistic outage, then add packs as budget allows.

What does X-Boost actually do?

X-Boost lets a unit run appliances above its rated AC output by boosting wattage at the cost of performance on the appliance: the RIVER 2 is a 300W inverter that X-Boosts to 600W, the RIVER 2 Pro an 800W unit that X-Boosts with 1,600W of surge, the DELTA 2 an 1,800W unit that X-Boosts to 2,200W, the DELTA 3 Plus an 1,800W unit with 2,200W X-Boost, and the DELTA 3 Ultra 3,600W with X-Boost to 4,600W, with EcoFlow noting the DELTA 3's X-Boost runs 2,600W+ appliances. The honest caveats: resistance heaters and similar loads run but heat more slowly, and surge-heavy motor starts can still trip the unit, so check the appliance's own surge figure against the unit's surge rating, not just X-Boost.

What is the EcoFlow warranty, and how long do the batteries last?

Five years is the verified standard across the rows we could source it for: RIVER 2, RIVER 2 Pro, DELTA 2, DELTA Pro 3, and DELTA Pro Ultra. The chemistry is LFP across the ladder, rated around 3,000 cycles on the RIVER 2 class (which EcoFlow frames as roughly 10 years of use) and 4,000 cycles on the DELTA 3 Plus. Where we could not verify a warranty term for a specific model, the table says so rather than guessing; confirm the term on the product page at purchase time.

Which EcoFlow should I buy for CPAP or camping?

Our solar generator sizing review budgets a CPAP at about 60W for 8 hours, or roughly 480Wh per night. That rules out the 256Wh RIVER 2 for anything beyond a partial night, makes the 512Wh RIVER 2 Max a one-night unit with a little headroom, and makes the 768Wh RIVER 2 Pro about a night and a half of CPAP, or one full night with phones and lights sharing the pack. For camping where the station also runs a cooler or cooking gear, step to a DELTA and accept the weight. All three RIVER units recharge fast from the wall (the RIVER 2 in about 60 minutes, the RIVER 2 Pro in about 70), which matters on multi-day trips with outlet access.

Why do prices for the same EcoFlow model vary so much?

Because EcoFlow's street pricing moves constantly and we only print dated, sourced figures. The DELTA 3 Ultra Plus launched at a $2,899 MSRP in January 2026 and Digital Trends tracked street pricing of $1,499-$1,599 by July 2026, noting $1,499 looks to be the new permanent price; CNET separately tracked a $2,599 to $1,599 deal in July 2026. That is a near-halving inside seven months, which is why our price-per-Wh ladder carries a date and a source on every row and why we never print an undated price. Check current pricing at the retailer before buying anything on this page.

Sources and update cadence

Specs are sourced from: EcoFlow product pages (us.ecoflow.com and the ecoflow.com FAQ, verified 2026-09-21), our own solar generators dataset (itself sourced from ecoflow.com), Digital Trends' DELTA 3 Ultra Plus coverage and comparison tables (2026-07-01), StorageReview's DELTA 3 Plus review (2025-01-02), GearLab's measured DELTA Pro 3 data, solargenreview, and popsci's February 2026 sale pricing. Prices are dated to their source and move constantly; confirm current pricing with retailers before buying. Refreshed quarterly.

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