DELTA 3 Ultra Plus
- your gear runs on 12V or Anderson
- you’ll wire a transfer switch
- you want a model with published reviews
DELTA 3800 Gen4
- you want 3,763Wh from one box
- space counts: about 38 L
- you’ll run up to 2,000W of solar
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.
Buy the Ultra Plus for what it plugs into. On energy, space and solar, the newer box has passed it.
The EcoFlow DELTA 3 Ultra Plus and the EcoFlow DELTA 3800 Gen4 deliver the same 3,600W with the same 7,200W surge, and both take the same two extra battery families. The 3800 Gen4 fits 691Wh more into less than half the volume, weighs 6.8 lb less and takes 400W more solar. The Ultra Plus answers with connections: a 30A Anderson port, a 12V socket, and a manual transfer switch and inlet box that EcoFlow lists for it. If your plan needs one of those, buy the Ultra Plus. If it doesn’t, the 3800 Gen4 is the better machine.
Below: every difference with numbers, a 20-second calculator and eight modeled situations. The Ultra Plus has published reviews; no full independent review of the 3800 Gen4 exists yet, so its side is EcoFlow’s word.
Prices $100 apart today. Same output, same surge, same UPS rating, same temperature ranges. The 3800 Gen4 holds 691Wh more, takes 400W more solar and needs less than half the space. The Ultra Plus adds a 12V socket, a 30A Anderson port and EcoFlow-listed home connection hardware.
- you need 12V or Anderson
- a transfer switch is the plan
- you want independent numbers
- you want more Wh per box
- it lives in a closet or van
- you run over 1,600W of solar
The six differences that decide it
Both are 120V LFP stations with four 20A outlets, a 30A outlet, 3,600W, a 7,200W surge and a battery port. These six gaps decide it.
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 and 3,199Wh on the 3800 Gen4. StorageReview measured 2.61kWh from an Ultra Plus, which matches our 85% rule.
Appliance for appliance, the 3800 Gen4 lasts 22% longer than the Ultra Plus.
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The price gap, in numbers
The EcoFlow DELTA 3800 Gen4 costs $100 more than the EcoFlow DELTA 3 Ultra Plus and adds 691Wh: that is $0.14 per extra Wh, against $0.52 per Wh for the Ultra Plus.
Prices refresh daily from EcoFlow US.What the $100 buys: 691Wh more battery (3,763Wh vs 3,072Wh), 400W more solar and less than half the volume, without the 12V ports.
Both grow with the same batteries, so the gap between the two systems stays the gap between the base units, and the 691Wh stays too. EcoFlow rates the 3800 Gen4 at 6,000 cycles to 70% and publishes no cycle count for the Ultra Plus, so a cost-per-cycle card would not compare like with like. EcoFlow also sells bundles of each, so check its pages before adding up parts.
Eight modeled situations, worked out
Same formula as the calculator above: 85% of rated capacity, no extra battery unless stated. The essentials plan averages 140W, about 3.4kWh a day.
An RV with Anderson-wired gear
This is the case the 3800 Gen4 can’t answer. The Ultra Plus has 378W of 12V power, shared between the two ports. EcoFlow lists no 12V output on the 3800 Gen4, so your 12V gear would need an AC adapter and the idle draw that comes with the inverter.
Feeding chosen circuits at home
EcoFlow’s Ultra Plus page lists a 30A transfer switch bundle and names an inlet box as a second way in. Its 3800 Gen4 compatibility table names neither, even though the unit has a 30A outlet. Ask an electrician and EcoFlow before planning this on the 3800 Gen4. It may change, but today’s paperwork favors the Ultra Plus.
A closet, a van bay, a shelf
Two 3800 Gen4 would fit in about the space of one Ultra Plus, on EcoFlow’s dimensions. The 3800 Gen4 is 16.77 in long and the Ultra Plus 24.1 in. If the spot is already measured, this could settle it before anything else does.
A roof full of panels
A tie, and that’s the point: the extra 400W exists to fill the extra 691Wh. Over five sun hours, 2,000W harvests about 7kWh against about 5.6kWh, so the 3800 Gen4 banks more per day, if you own the panels.
A multi-day generator plan
Both take 3,200W and both can start and stop the generator automatically. EcoFlow publishes 53 minutes to 80% and 76 to full for the Ultra Plus, and no generator time for the 3800 Gen4. The Ultra Plus also lists 3,960W with solar and generator together. For the 3800 Gen4, EcoFlow hasn’t published a combined figure.
A desk of USB-C gear
The Ultra Plus’s two smaller ports share 45W. The 3800 Gen4 gives 65W each, with one catch: when a 65W port shares a circuit with USB-A, EcoFlow limits that circuit to 16W. Skip the USB-A and the 3800 Gen4 is the better desk companion.
A night on essentials
Four more hours from the 3800 Gen4 on one charge. Add the same two 2,048Wh batteries to each and you reach about 44 hours on the Ultra Plus and about 48 on the 3800 Gen4.
Moving it
The 3800 Gen4 is lighter and shorter, but it has two handles and no wheels unless you add EcoFlow’s folding cart. EcoFlow’s photos show rear wheels on the Ultra Plus. On flat floors the heavier one may be the easier one. On stairs it isn’t.
Eight 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 3800 Gen4 weight, dimensions and full specifications
Weight: 74.3 lb for the DELTA 3 Ultra Plus and 67.5 lb for the DELTA 3800 Gen4. Dimensions: 24.1 × 12.9 × 15.5 in and 16.77 × 11.36 × 12.09 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Ultra Plus and EcoFlow DELTA 3800 Gen4 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
- Extra battery and adapter sold separately
DELTA 3800 Gen4
- DELTA 3800 Gen43,763Wh, 67.5 lb
- AC charging cable
- Two solar charging cablesXT60i to LP60
- AC cable retention kit, manuals and warranty card
- Expansion adapter and batteriessold separately
From EcoFlow’s US pages. Extra batteries and the Expansion Adapter are sold separately for both.
06 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
Ultra Plus: 1,800W from a 15A outlet; How-To Geek’s unit arrived set to 200W, and full power tripped its GFCI outlet3800 Gen4: 1,800W from a 15A outlet; the 146 minutes comes from visuals on EcoFlow’s US page
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
DELTA 3 Ultra Plus
DELTA 3800 Gen4
Practical consequence: the AC side is the same, four 20A outlets and a 30A outlet. The split is at low voltage: 12V and Anderson on the Ultra Plus, faster USB on the 3800 Gen4.
08 · NoiseNoise: Ultra Plus vs 3800 Gen4
At 600W EcoFlow rates the EcoFlow DELTA 3 Ultra Plus a little lower, 25dB or less against up to 30dB. Only the EcoFlow DELTA 3800 Gen4 has figures above that.
Brand figures, plus one reviewer’s impression of the Ultra Plus.Every figure we found, with its source
What reviewers heard: Digital Trends found the fan noise unnoticeable even under full load.
Measured by a tester Brand figure
- Keep night loads at 600W or less on either unit.
Cold and heat: Ultra Plus vs 3800 Gen4
The EcoFlow DELTA 3 Ultra Plus and the EcoFlow DELTA 3800 Gen4 share the same ranges: charging from 32°F to 113°F, running from 14°F to 113°F.
Figures from the EcoFlow US pages.- Keep either one above 32°F while it charges.
App, UPS and smart features
Both are under 10ms and both take extra batteries. The EcoFlow DELTA 3 Ultra Plus is the one EcoFlow lists for a home connection. The EcoFlow DELTA 3800 Gen4 has the fridge mode.
Same EcoFlow app, over Wi-Fi and Bluetooth.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it connect to a home panel? EcoFlow lists a manual transfer switch and an inlet box for the EcoFlow DELTA 3 Ultra Plus. The compatibility table for the EcoFlow DELTA 3800 Gen4 names neither.
Does it have a fridge mode? Fridge Runtime Boost is listed for the EcoFlow DELTA 3800 Gen4, one compressor appliance at a time.
Does it work as a UPS? EcoFlow rates both under 10ms. StorageReview measured 8.25ms on the EcoFlow DELTA 3 Ultra Plus; the EcoFlow DELTA 3800 Gen4 has no measurement yet and no HID communication.
Can you add a battery later? Both take the DELTA 3 Max Plus or DELTA Pro 3 extra batteries. Two need the Expansion Adapter.
Can it start a generator by itself? Both start and stop an EcoFlow Smart Generator automatically, at up to 3,200W. EcoFlow says the EcoFlow DELTA 3800 Gen4 does it only through the battery port.
Can it run a heater or kettle above its rating? EcoFlow gives 4,600W for the EcoFlow DELTA 3 Ultra Plus and no figure on the US page of the EcoFlow DELTA 3800 Gen4.
Does it prepare for storms? Both recharge ahead of severe weather. The EcoFlow DELTA 3800 Gen4’s 2.0 version uses National Weather Service data.
Warranty and support
Same terms: the EcoFlow DELTA 3 Ultra Plus and the EcoFlow DELTA 3800 Gen4 get 3 years, plus 2 more once registered. Only the EcoFlow DELTA 3800 Gen4 comes with a published cycle rating.
A tie on years, a small edge to the 3800 Gen4 on disclosure.Subject to each brand’s warranty terms and eligibility.
EcoFlow rates the DELTA 3800 Gen4 at 6,000 cycles to 70% of initial capacity. EcoFlow US doesn’t publish a cycle rating for the DELTA 3 Ultra Plus, only 10 years of reliable power.
- Register either one in the EcoFlow app to get the extra 2 years.
What reviewers report
We have not had these two units in hand. As of November 5, 2026, no full independent review of the DELTA 3800 Gen4 had been published. Here is what published reviews found on the DELTA 3 Ultra Plus, with the source, author and date for each point. Read them as a guide to that model only.
DELTA 3 Ultra Plus: StorageReview (September 2025), Digital Trends (July 2026), How-To Geek (October 2025)DELTA 3800 Gen4: no verifiable independent test found
Usable capacity
- Ultra PlusReviewer A full discharge delivered 2.61kWh from the 3,072Wh pack, about 85 percent. StorageReview, Dylan Dougherty, September 2025
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
- Ultra PlusReviewer Out of the box it charged at 200W; at the full 1,800W setting a full charge took about 1 hour 40 minutes, slower than the claimed 89 minutes. How-To Geek, Cory Gunther, October 2025
Noise and heat
- Ultra PlusReviewer Fan noise stayed unnoticeable even under full load. Digital Trends, Ian Bell, July 2026
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
- Ultra PlusReviewer A garage freezer ran for nearly three full days on one charge. Digital Trends, Ian Bell, July 2026
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
- Ultra PlusReviewer Big and heavy at over 75 lbs, with a display hard to read in sunlight. How-To Geek, Cory Gunther, October 2025
Practical limits before you buy
- The 3800 Gen4 launched as a pre-order. If you need power this week, check the status pills at the top of the page before you decide.
- The DELTA Pro 3 Extra Battery showed as unavailable on November 5, 2026. Both top ceilings depend on it. With two DELTA 3 Max Plus batteries, the Ultra Plus stops at 7,168Wh and the 3800 Gen4 at 7,859Wh.
- Two batteries need the Expansion Adapter on both models, sold separately.
- The Ultra Plus’s 378W is shared. The Anderson port and the 12V socket split one budget.
- The Ultra Plus may not arrive at full speed. How-To Geek’s unit charged at 200W out of the box, and 1,800W tripped a GFCI outlet in the reviewer’s garage.
- Fridge claims don’t transfer. EcoFlow’s 70+ hours for the 3800 Gen4 came from an empty refrigerator.
- The 3800 Gen4’s 6,000 cycles run to 70%, not to the 80% often quoted elsewhere.
- X-Boost has no number on the 3800 Gen4. EcoFlow says it’s supported, and points to the manual. It doesn’t work while the unit is on AC input.
- Neither does 240V. Both are 120V only.
- Register either one in the EcoFlow app for the last 2 years of warranty.
Frequently asked questions
What is the difference between the DELTA 3 Ultra Plus and the DELTA 3800 Gen4?
Same 3,600W output and 7,200W surge. The 3800 Gen4 holds 3,763Wh against 3,072Wh, takes 2,000W of solar against 1,600W, and fills about 38 L against about 79 L. The Ultra Plus has a 12V socket, a 30A Anderson port and EcoFlow-listed transfer switch support.
Which is cheaper?
The EcoFlow DELTA 3 Ultra Plus costs $100 less today: $1,599, against $1,699 for the EcoFlow DELTA 3800 Gen4. Per Wh, the 3800 Gen4 is cheaper: $0.45, against $0.52. Prices refresh daily.
Does the 3800 Gen4 replace the Ultra Plus?
Not fully. EcoFlow calls the DELTA 3 Ultra series the previous generation in its FAQ, but the 3800 Gen4 drops the 12V ports, and its compatibility table names no transfer switch or inlet box.
Do they use the same extra batteries?
Yes. EcoFlow lists the DELTA 3 Max Plus battery, 2,048Wh, and the DELTA Pro 3 battery, 4,096Wh, for both. Each connects up to two; two need the Expansion Adapter.
Can the 3800 Gen4 run 12V gear?
EcoFlow lists no 12V output. It has USB and AC, so a 12V appliance needs its own AC adapter.
Can I connect either to my house?
EcoFlow lists a manual transfer switch and an inlet box for the Ultra Plus, at 120V. It lists neither for the 3800 Gen4.
Which is better for an RV?
If the rig has Anderson or 12V gear, the Ultra Plus. If it only needs a 30A cord and storage is tight, the 3800 Gen4, once you’ve checked its 30A plug type against your cord: it looks like a TT-30 in EcoFlow’s photos.
Which is quieter?
At 600W, the Ultra Plus on paper: 25dB or less against up to 30dB. Above that, only the 3800 Gen4 has figures. Digital Trends found the Ultra Plus’s fans unnoticeable at full load.
Has anyone reviewed them?
The Ultra Plus, yes: StorageReview, Digital Trends and How-To Geek. For the 3800 Gen4, we found no full independent review as of November 5, 2026.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not had either unit in hand. As of November 5, 2026, no full independent review of the DELTA 3800 Gen4 had been published. Specs come from EcoFlow’s US pages, and reviewer findings on the Ultra Plus are credited. Prices and availability were checked on November 5, 2026.
- Specs: EcoFlow US, DELTA 3 Ultra Plus and EcoFlow US, DELTA 3800 Gen4, with their specs, footnotes and FAQ, and EcoFlow US, DELTA 3 Max Plus Smart Extra Battery, read on November 5, 2026.
- Volumes are our math from EcoFlow’s dimensions, without handles for the 3800 Gen4: about 79 L and about 38 L.
- Our calculator adds 4,096Wh per battery on the Ultra Plus and 2,048Wh on the 3800 Gen4; both models take both batteries, so compare like with like in the text above.
- Reviewer reports on the DELTA 3 Ultra Plus: StorageReview, Dylan Dougherty, September 2025, Digital Trends, Ian Bell, July 2026, How-To Geek, Cory Gunther, October 2025.
- 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).
The same 3,600W either way: 12V ports and a listed transfer switch, or 691Wh more in half the space.
Prices checked November 13, 2026 at 6:59 AM EST
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Originally published: November 7, 2026