DELTA 3 Ultra Plus
- it lives indoors: 25dB at 600W, 74 lb on wheels
- a PC, a NAS or a CPAP needs the 10ms UPS
- you’ll expand with current extra batteries
DELTA Pro
- you want 3,600Wh in the base unit
- you want 240V with two units, or EcoFlow’s Smart Home Panel 2
- you’ll charge at EV stations with the X-Stream adapter
Prices and stock checked by our price engine on November 13, 2026 at 6:59 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Both grow past 10kWh. Only one is quiet enough for the living room.
The EcoFlow DELTA 3 Ultra Plus and the EcoFlow DELTA Pro both deliver 3,600W, take 1,600W of solar and expand past 10kWh. The Ultra Plus costs $200 less, weighs 25 lb less, runs at 25dB instead of 48 to 60dB and switches to UPS in 10ms instead of 30ms. The DELTA Pro keeps 528Wh more per unit, 240V with two units and EV-station charging, but its extra battery was sold out at EcoFlow US on October 30, 2026.
Below: every difference with numbers, a 20-second calculator for your own gear, six modeled situations, the DELTA Pro 3 as a third option, and what published tests found.
Same 3,600W, same 1,600W of solar, both expandable. The DELTA Pro costs $200 more for 528Wh more per unit and 240V and EV-charging options; the Ultra Plus wins on weight, noise, UPS speed and generator charging.
- you’ll move it: 25 lb lighter
- it sits in a living space: 25dB
- it protects a computer: 10ms UPS
- you want 3,600Wh per unit
- you’ll pair two for 240V
- you’ll charge at EV stations
The five differences that decide it
The five gaps that decide the purchase, with the better spec for most buyers flagged. The 3,600W inverter, 7,200W surge, 1,600W solar input, 30A Anderson port, four 20A outlets plus a 30A outlet and the 5-year warranty are the same.
Will it run your setup? Check in 20 seconds
Estimates use 85% usable capacity and 70% of rated solar output. Real results vary with temperature, inverter load, shade and appliance cycling. Fridge and freezer watts are daily averages and do not include compressor startup surges.
Runtime by appliance, one at a time
Simple energy estimates, not measured runtimes. About 2,611Wh usable on the Ultra Plus (StorageReview measured 2,610Wh) and 3,060Wh on the DELTA Pro.
Appliance for appliance, the DELTA Pro lasts 17% longer than the Ultra Plus.
Same appliance, same watts: the gap is always the size of the battery.Get our Black Friday alerts for EcoFlow
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The price gap, in numbers
The EcoFlow DELTA Pro costs $200 more than the EcoFlow DELTA 3 Ultra Plus and adds 528Wh: that is $0.38 per extra Wh, against $0.52 per Wh for the Ultra Plus.
Prices refresh daily from EcoFlow US.What the $200 buys: 528Wh more battery (3,600Wh vs 3,072Wh), at the same 3,600W.
EcoFlow rates the DELTA Pro at 3,500 cycles to 80% and publishes no count for the Ultra Plus, so we apply the same figure; read the lifetime card as a ranking. The second card is the practical point: on October 30, 2026, the Ultra Plus could be expanded with a battery, the DELTA Pro could not. EcoFlow US prices move often; the figures here are refreshed daily by our price engine.
The third option: the DELTA Pro 3 at $2,799
EcoFlow DELTA Pro 3: $2,799 today
The DELTA Pro’s successor, and the answer if you want the Ultra’s generation and the Pro’s expansion in one unit. 4,096Wh, 4,000W at 120V and 240V (X-Boost to 6,000W), a 10ms UPS, 4,000 cycles to 80%, and an L14-30 outlet next to the TT-30. EcoFlow sells its extra battery, and quotes 4 to 48kWh for full systems. It sits $1,200 above the Ultra Plus. It is also $1,000 above the DELTA Pro. DELTA Pro vs DELTA Pro 3 and our DELTA Pro 3 review go deeper. See the DELTA Pro 3 at EcoFlow.
Eight modeled situations, worked out
Same formula as the calculator above, with 0 extra batteries unless stated. The fridge averages 60W, about 525kWh a year, in the range printed on typical EnergyGuide labels; that average does not include compressor startup surges.
24-hour outage, essentials only
The DELTA Pro lasts about five hours longer on its own; an Ultra Plus with one extra battery, covers almost three days.
A window AC through a summer outage
Both run the AC through an evening, not a day. Neither covers air conditioning around the clock without solar or a generator; that is where the DELTA Pro’s 1,600W of solar and extra batteries come in.
Home office through an outage
Both carry a workday. The switchover decides it: under 10ms on the Ultra Plus (8.25ms measured), under 30ms on the DELTA Pro.
Refill from solar, 1,600W of panels
Same solar input; the Ultra Plus refills its smaller battery a little sooner.
Two nights in an RV
Both have a 30A RV outlet, a 12V socket and a 30A Anderson port. The Ultra Plus is 25 lb easier to load and charges from an alternator with solar on top; the DELTA Pro lasts a few hours longer.
A well pump through an outage
Both start it easily: 7,200W of surge on each. A 240V well pump is another story: neither delivers 240V alone, and the DELTA Pro needs a second unit and the Double Voltage Hub for it.
A full-size fridge, nothing else
The DELTA Pro keeps food cold about 7.5 h longer on one charge. With solar during the day, either one can carry a fridge through a multi-day outage.
A 1,500W space heater on high
Heaters drain any portable station fast. Use the low setting, heat one small room, and treat the station as a bridge, not a heating plan.
Nine more differences, the spec sheet and the box
Smaller gaps that rarely decide the purchase, then the full specifications and what ships in the box.
DELTA 3 Ultra Plus and DELTA Pro weight, dimensions and full specifications
Weight: 74.3 lb for the Ultra Plus and 99 lb for the DELTA Pro. Dimensions: about 24.1 × 12.9 × 15.6 in and 25 × 11.2 × 16.4 in, per EcoFlow. Everything else is in the sheet below.
EcoFlow DELTA 3 Ultra Plus and DELTA Pro full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
DELTA 3 Ultra Plus
- DELTA 3 Ultra Plus3,072Wh, 74.3 lb
- AC charging cable
- Manuals and warranty card
- No solar or car cablesold separately
DELTA Pro
- DELTA Pro power station3,600Wh, 99 lb
- AC charging cable
- Car charging cable
- Solar charging cable
- DC5521 to DC5525 cable, Smart Generator adapter, handle cover
- User manual and warranty card
DELTA 3 Ultra Plus: EcoFlow US product page. DELTA Pro: its user manual.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
DELTA Pro: AC and solar together up to 3,000W (EcoFlow)Ultra Plus: solar + alternator 2,600W, solar + generator 3,960W
Our solar times assume panels deliver 70% of their rating; EcoFlow’s own figures assume ideal sun.
Every port, side by side
DELTA 3 Ultra Plus
DELTA Pro
Practical consequence: nearly the same outlets and DC ports. The DELTA Pro has more USB-A and DC5521 ports; the Ultra Plus has the faster USB-C and Smart Output Priority.
09 · NoiseNoise: Ultra Plus vs DELTA Pro
The EcoFlow DELTA 3 Ultra Plus is far quieter: EcoFlow rates it at 25dB or less at 600W, against 48 to 60dB at 1 m for the EcoFlow DELTA Pro, depending on load and temperature.
Both are EcoFlow’s figures. In a bedroom or an office, this gap matters more than any spec.Every figure we found, with its source
What reviewers heard: Fan noise stayed unnoticeable even under full load (Digital Trends).
What reviewers heard: Fans switched on at around 3,000W with a microwave added (CleanTechnica); they ramp up under heavy draw and fast charging, then can stop completely at low loads (StorageReview).
Measured by a tester Brand figure
- Lower the AC charging speed in the app overnight on either unit.
Cold, heat and storage: Ultra Plus vs DELTA Pro
The EcoFlow DELTA 3 Ultra Plus and the EcoFlow DELTA Pro share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. Both are indoor units with no water rating.
Figures from the EcoFlow US DELTA 3 Ultra Plus page and the DELTA Pro user manual.- In a garage in winter, bring either one inside to charge: neither charges below 32°F.
- For long storage, keep it at 68°F to 86°F with some charge and top it up every few months; the DELTA Pro manual says never to store it above 113°F.
App, UPS and smart features
The EcoFlow DELTA 3 Ultra Plus does more: a 10ms UPS, Storm Guard, time-of-use and X-Fusion. The EcoFlow DELTA Pro answers with the Smart Home Panel 2 and a 240V path with two units.
Same EcoFlow app over Wi-Fi and Bluetooth; both work with EcoFlow’s Smart Generators.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it prepare for storms? The EcoFlow DELTA 3 Ultra Plus starts charging before extreme weather once Storm Guard is on; it is one of the 2025 features the EcoFlow DELTA Pro doesn’t list.
Can it charge off-peak? The EcoFlow DELTA 3 Ultra Plus charges off-peak with automated tasks, on app V6.15+ and firmware V7.80.99.52+; no off-peak schedule is listed for the EcoFlow DELTA Pro.
Can it power appliances fully while charging? With X-Fusion, the EcoFlow DELTA 3 Ultra Plus still delivers its full 3,600W while it charges from the wall, instead of passing through only what the 15A cord carries.
Does it work as a UPS? The EcoFlow DELTA 3 Ultra Plus switches in under 10ms; StorageReview measured 8.25ms, and its 140W USB-C supports HID for a clean PC shutdown. The EcoFlow DELTA Pro’s EPS switches within 30ms, which covers most appliances but can reboot some desktops.
Does it connect to a home panel? The EcoFlow DELTA 3 Ultra Plus connects to a house through a manual transfer switch or an inlet box via its 30A outlet. The EcoFlow DELTA Pro also works with the Smart Home Panel 2 through the Double Voltage Hub, and two DELTA Pros can make 240V.
Can it start a generator by itself? Both work with EcoFlow’s Smart Generators; the EcoFlow DELTA Pro ships with the adapter.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth; Digital Trends found that most Ultra Plus settings need the app. The EcoFlow DELTA Pro’s AC output switches itself off after 12 hours at a negligible load.
Warranty and support
EcoFlow gives the EcoFlow DELTA 3 Ultra Plus 3 years, plus 2 once registered in the app. For the EcoFlow DELTA Pro, its product page says the same 3+2, but EcoFlow’s US warranty table lists only 24 months, or 24 + 36 with registration.
We take the cautious reading for the DELTA Pro: 2 years, 5 once registered.Subject to each brand’s warranty terms and eligibility.
EcoFlow US rates the DELTA Pro at 3,500 cycles to 80%, about 10 years at one full cycle a day, and publishes no cycle count for the DELTA 3 Ultra Plus. Calendar aging and heat also reduce capacity, so read the rating as a ceiling.
- Register whichever you choose in the EcoFlow app the day it arrives: both extensions depend on it.
- For the DELTA Pro, check the term at checkout: EcoFlow’s product page and warranty table disagree.
What reviewers report
We have not lab-tested these two units. Here is what 7 published reviews found, with the source, author and date for each point. Reviews of UK and EU units are flagged: those models charge from 230V outlets and have different sockets, so their charge times and outlet findings don’t carry over to US units.
Ultra Plus: StorageReview (September 2025), Digital Trends (July 2026), How-To Geek (October 2025)DELTA Pro: OutdoorGearLab (May 2025), CleanTechnica (August 2022), StorageReview (October 2022), Android Central (January 2022)
Usable capacity
- Ultra PlusReviewer A full discharge delivered 2.61kWh from the 3,072Wh pack, about 85 percent. StorageReview, Dylan Dougherty, September 2025
- DELTA ProReviewer Lab test drew 3,060Wh over AC, about 85% of the 3,600Wh rating, which the testers call roughly average for AC output. OutdoorGearLab, Kenji Mowrey, May 2025
- DELTA ProReviewer With a steady 350W load, the testers got 3,000Wh out, and a full recharge drew 4,180Wh from the wall. StorageReview, Kevin OBrien, October 2022
Charging
- Ultra PlusReviewer Refilling from empty took 3.54kWh from the wall, about 87 percent charging efficiency. StorageReview, Dylan Dougherty, September 2025
- Ultra PlusReviewer Wall charging at 1,800W reached 100 percent in roughly an hour and forty minutes. Digital Trends, Ian Bell, July 2026
- DELTA ProReviewer Fastest wall charging of the whole test group, averaging 1,412Wh per hour. OutdoorGearLab, Kenji Mowrey, May 2025
- DELTA ProReviewer From a standard household outlet it went from empty to full in under three hours at up to 1,800W. Android Central, Chris Wedel, January 2022
Noise and heat
- Ultra PlusReviewer Fan noise stayed unnoticeable even under full load. Digital Trends, Ian Bell, July 2026
- DELTA ProReviewer At around 3,000W of draw, with a microwave added, the cooling fans switched on but the unit kept running. CleanTechnica, Jennifer Sensiba, August 2022
- DELTA ProReviewer Fans ramp up under heavy draw and fast charging, then spin down and can stop completely at low loads. StorageReview, Kevin OBrien, October 2022
UPS and output
- Ultra PlusReviewer Measured UPS transfer time was 8.25ms on a workstation load. StorageReview, Dylan Dougherty, September 2025
- Ultra PlusReviewer A full workstation with desktop, monitor, tablet and router ran for over 10 hours with capacity left. Digital Trends, Ian Bell, July 2026
- DELTA ProReviewer Only an emergency power supply: its switchover of 30ms or less is too slow to count as a true UPS. OutdoorGearLab, Kenji Mowrey, May 2025
- DELTA ProReviewer Plugged into an RV through its 30A outlet, it ran the camper air conditioner, which pulled about 1,400W once the compressor started. CleanTechnica, Jennifer Sensiba, August 2022
Daily use and issues
- Ultra PlusReviewer The display struggles in direct sunlight. Digital Trends, Ian Bell, July 2026
- Ultra PlusReviewer Switching to full 1,800W charging tripped the reviewer’s garage GFCI outlet. How-To Geek, Cory Gunther, October 2025
- DELTA ProReviewer Measured weight is about 97 lb, so it belongs in a semi-permanent spot despite wheels and handle. OutdoorGearLab, Kenji Mowrey, May 2025
- DELTA ProReviewer Over Bluetooth, the app estimated just over an hour of runtime at that heavy load. CleanTechnica, Jennifer Sensiba, August 2022
Practical limits before you buy
- The DELTA Pro’s extra battery was sold out. On October 30, 2026, EcoFlow US listed the DELTA Pro Smart Extra Battery as unavailable; the Ultra Plus takes DELTA Pro 3 Extra Batteries.
- X-Boost is for heating loads only. Motors need the 3,600W rating and 7,200W surge, the same on both.
- Neither gives you 240V alone. Two DELTA Pros with the Double Voltage Hub do; the Ultra Plus doesn’t.
- The DELTA Pro is loud for a living room. EcoFlow quotes 48 to 60dB.
- 99 lb is a two-person lift; the Ultra Plus is 74.3 lb on wheels.
- The Ultra Plus ships without solar or car cables. The DELTA Pro includes both.
- Register both in the EcoFlow app for 5 years: the Ultra Plus is 3 years out of the box plus 2 after registration, the DELTA Pro 2 years plus 3.
- Ultra Plus, per its US documentation: Anderson 30A and car outlet share one 12.6V budget: 378W total.
- Ultra Plus, per its US documentation: The two 45W USB-C ports share 45W total.
- Ultra Plus, per its US documentation: Wall charging 1800W, 0-80% in 89 minutes; the 48-minute figure needs solar plus Smart Generator together.
- Ultra Plus, per its US documentation: Expandable to 11kWh with 2 x DELTA Pro 3 Extra Battery.
- DELTA Pro, per its US documentation: Wall charging on the US version: 1,800W in about 2.7 h, or 3,000W in about 1.8 h on 240V; the 2,900W figure is the international version.
Frequently asked questions
Is the DELTA 3 Ultra Plus a replacement for the DELTA Pro?
In practice, yes for most buyers: same 3,600W and 1,600W of solar, expansion past 10kWh, lighter, quieter and with a 10ms UPS. The DELTA Pro’s direct successor in EcoFlow’s lineup is the DELTA Pro 3.
Which extra batteries fit the Ultra Plus?
Up to two DELTA Pro 3 Extra Batteries for about 11kWh, and DELTA 3 Max Plus Extra Batteries with the Expansion Adapter, per EcoFlow.
How long will each run a refrigerator?
At a 60W average: about 43 hours on the Ultra Plus and 51 hours on the DELTA Pro.
Which is better as a UPS?
The Ultra Plus: under 10ms, measured at 8.25ms, with HID over USB-C. The DELTA Pro’s EPS switches within 30ms.
Which charges faster?
From a Smart Generator, the Ultra Plus: 3,200W, 0 to 80% in 53 minutes. From an EV station, only the DELTA Pro (3,400W with the X-Stream adapter). Solar input is 1,600W on both.
Can either power a house?
Both connect through a transfer switch or inlet box via their 30A outlet. The DELTA Pro also works with the Smart Home Panel 2, and two DELTA Pros can make 240V.
How much do they weigh?
74.3 lb for the Ultra Plus and 99 lb for the DELTA Pro.
Is the DELTA Pro still worth buying?
Only for its 3,600Wh base, 240V pairing or EV-station charging. Otherwise the Ultra Plus does the job, and the DELTA Pro 3 is the newer alternative.
Do reviews confirm the rated capacity?
Ultra Plus: A full discharge delivered 2.61kWh from the 3,072Wh pack, about 85 percent (StorageReview). DELTA Pro: Lab test drew 3,060Wh over AC, about 85% of the 3,600Wh rating, which the testers call roughly average for AC output (OutdoorGearLab). Inverter losses usually take 10 to 20% on AC, which is why our calculator uses 85% of the rating.
How loud are the Ultra Plus and the DELTA Pro?
EcoFlow rates the Ultra Plus at 25dB or less at 600W, measured at 1 m and the DELTA Pro at 48 to 60dB at 1 m depending on load and temperature. Fans ramp up mostly during fast charging and near full output; capping the charging speed in the app is the easiest way to keep either quiet at night.
Do I have to register for the 5-year warranty?
Ultra Plus: 3 years, 5 after app registration. DELTA Pro: 2 years, 5 after app registration. Where the extension depends on registration, do it in the EcoFlow app as soon as the unit arrives.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. Specs come from EcoFlow US documentation and the DELTA Pro user manual; usage observations are attributed to named reviewers. Prices and availability were checked on October 30, 2026.
- Specs: EcoFlow US, DELTA 3 Ultra Plus and EcoFlow US, DELTA Pro (including the noise FAQ), read on October 30, 2026.
- DELTA Pro ports, inputs, cycles, temperatures, EPS switchover and box contents: DELTA Pro user manual, 120V edition.
- DELTA 3 Ultra Plus cycle life: not published by EcoFlow US; we use the DELTA Pro’s 3,500 cycles for both in the price-per-cycle card.
- Reviewer reports on the Ultra Plus: StorageReview, Dylan Dougherty, September 2025, Digital Trends, Ian Bell, July 2026, How-To Geek, Cory Gunther, October 2025; on the DELTA Pro: OutdoorGearLab, Kenji Mowrey, May 2025, CleanTechnica, Jennifer Sensiba, August 2022, StorageReview, Kevin OBrien, October 2022, Android Central, Chris Wedel, January 2022.
- Runtime = capacity × 0.85 ÷ watts. Solar harvest = min(panel watts, max input) × sun hours × 0.70. Cost per lifetime kWh = price ÷ (cycles × capacity in kWh). Service life = cycles ÷ 365.
Same 3,600W and solar, both expandable. The Ultra Plus is 25 lb lighter, quieter, with a 10ms UPS, for $200 less.
Prices checked November 13, 2026 at 6:59 AM EST
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Originally published: November 7, 2026