DELTA 3 Max Plus
- it travels: 48.7 lb
- your rig has 12V or Anderson gear
- you charge while driving: 800W
DELTA 3800 Gen4
- it’s for home outages: 3,763Wh
- you need 3,600W or a 30A outlet
- you’ll run 2,000W of solar
Prices and stock checked by our price engine on November 13, 2026 at 6:29 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
If it stays on a shelf, buy the 3800 Gen4. If it leaves the shelf every weekend, buy the Max Plus.
On EcoFlow’s dimensions, the EcoFlow DELTA 3 Max Plus and the EcoFlow DELTA 3800 Gen4 take up about the same space, near 37 L. The 3800 Gen4 fills it with 3,763Wh against 2,048Wh, delivers 3,600W against 3,000W, and adds a 30A outlet and 2,000W of solar. The Max Plus pays that back in places a parked station doesn’t care about: 18.8 lb less to lift, a 12V socket, a 30A Anderson port and 800W of charging while you drive. Both take the same extra batteries, so neither is a dead end. Home backup points to the 3800 Gen4. A van, a truck bed or a campsite points to the Max Plus.
Below: every difference with numbers, a 20-second calculator and eight modeled situations, including the two-box route to 4kWh. The Max Plus has published reviews; no full independent review of the 3800 Gen4 exists yet.
Prices $550 apart today. Close to the same volume, the same extra batteries, UPS ratings both under 10ms. The 3800 Gen4 holds 1,715Wh more, delivers 600W more, adds a 30A outlet and doubles the solar input. The Max Plus is 18.8 lb lighter, has 12V ports and charges faster from an alternator.
- you lift it often
- you run 12V or Anderson gear
- you refill on the road
- it’s for outages at home
- loads go past 3,000W
- you need a 30A outlet
The six differences that decide it
Both are 120V LFP stations with a battery port, USB-C up to 140W and no wheels, in about the same volume. 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 1,741Wh usable on the Max Plus and 3,199Wh on the 3800 Gen4. Reviewers got between 1,640Wh and 1,898Wh from the Max Plus, so our figure sits inside what they measured.
Appliance for appliance, the 3800 Gen4 lasts 84% longer than the Max Plus.
Same appliance, same watts: the gap is always the size of the battery.Get our Black Friday alerts for EcoFlow
We track live prices on 40+ models from Jackery, EcoFlow, BLUETTI and Anker SOLIX. When a deal beats the lowest price we've recorded, you'll hear from us. During Black Friday week, one short recap a day at most.
Unsubscribe in one click. We may earn a commission when you buy through our links, at no extra cost to you. Privacy Policy
The price gap, in numbers
The EcoFlow DELTA 3800 Gen4 costs $550 more than the EcoFlow DELTA 3 Max Plus and adds 1,715Wh: that is $0.32 per extra Wh, against $0.56 per Wh for the Max Plus.
Prices refresh daily from EcoFlow US.What the $550 buys: 1,715Wh more battery (3,763Wh vs 2,048Wh), 600W more output, a 30A outlet and 1,000W more solar.
3800 Gen4 alone (3,763Wh, one box) costs $309 less today.
The second card is the one to study if you were planning to start small and add a battery. It compares two routes to roughly the same energy, at today’s prices, before any bundle. The two-battery card leaves out the Expansion Adapter, needed on both. EcoFlow rates the 3800 Gen4 at 6,000 cycles to 70% and publishes no cycle count for the Max Plus, so we skip a cost-per-cycle card.
Eight modeled situations, worked out
Same formula as the calculator above: 85% of rated capacity, no extra battery unless stated. Essentials here means a steady 140W, close to 3.4kWh a day.
Friday night, loading the truck
Weight you lift once a year doesn’t matter. Weight you lift every weekend does. EcoFlow’s folding cart helps either one across a driveway, but not onto a tailgate. If trips are the main job, this line outweighs the capacity gap.
A night and a day of essentials at home
The Max Plus gets you through a night. The 3800 Gen4 gets you to the next evening, nearly. That’s the difference between a blackout you sit out and one you have to manage.
Two routes to about 4kWh
The two-box route holds 333Wh more, and the heaviest piece is 48.7 lb, with a 35.3 lb battery on the side. You can also leave the battery at home for a trip. The single box needs about 38 L against about 60 L, and it keeps 3,600W and the 30A outlet. Extra capacity never raises the output limit.
Microwave, coffee maker and space heater together
Past 3,000W, the Max Plus is out, and no extra battery changes that. X-Boost helps heating loads up to 3,800W at reduced power, which isn’t the same as a mixed load. The 3800 Gen4 sits right at its rating here. Drop one appliance and both cope.
Which RV plug?
They solve opposite problems. The 3800 Gen4 takes the shore cord, which feeds the rig’s 120V side, if its plug matches yours. The Max Plus has no 30A outlet but feeds 12V gear directly, up to 378W shared. Look at how your rig is wired before you look at anything else.
Refilling while you drive
The Max Plus takes 800W through its battery port, with an adapter. On the 3800 Gen4, EcoFlow lists 500W through the solar port. A half-day drive refills the Max Plus and leaves the 3800 Gen4 well short. For a van, that can matter more than capacity.
Panels on a roof or a rack
Time to fill is close: about 2.9 h for the Max Plus and 2.7 h for the 3800 Gen4. Daily energy isn’t. If you can mount more than 1,000W, only the 3800 Gen4 can use it. With a small folding kit, the limit doesn’t matter to either.
A desk that can’t blink
Same rating, more evidence on one side: StorageReview measured 8ms on the Max Plus, and The Technology Man 8.4ms with a desktop PC staying on. The 3800 Gen4 has EcoFlow’s figure only, and no HID link to tell a PC to shut down. Try your own hardware on either.
Seven 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 Max Plus and DELTA 3800 Gen4 weight, dimensions and full specifications
Weight: 48.7 lb for the DELTA 3 Max Plus and 67.5 lb for the DELTA 3800 Gen4. Dimensions: 19.4 × 9.5 × 12.0 in and 16.77 × 11.36 × 12.09 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Max 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 Max Plus
- DELTA 3 Max Plus power station2,048Wh, 48.7 lb
- AC charging cable
- Manuals and warranty card
- No solar cable, no car cablebundles include the matching cables
- No extra battery, no Alternator Chargerboth 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. The 3800 Gen4 includes two solar cables; the Max Plus includes none.
06 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
Max Plus: 1,800W from a 15A outlet; UK reviewers’ faster times came from 230V mains and don’t apply3800 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 Max Plus
DELTA 3800 Gen4
Practical consequence: the 3800 Gen4 has one more AC outlet, the 30A, and faster small USB ports. The Max Plus has the low-voltage side: a 12V socket and an Anderson port, sharing 378W.
08 · NoiseNoise: Max Plus vs 3800 Gen4
At 600W EcoFlow rates the EcoFlow DELTA 3 Max Plus a little lower, 25dB or less against up to 30dB. Only the EcoFlow DELTA 3800 Gen4 has figures above that, and only the Max Plus has outside impressions.
Brand figures, plus UK reviewers on the Max Plus.Every figure we found, with its source
What reviewers heard: T3’s fans almost never came on with a home office load. The Technology Man’s meter barely rose above room noise at one meter.
Measured by a tester Brand figure
- In a tent or van, stay under 600W overnight.
Cold and heat: Max Plus vs 3800 Gen4
The EcoFlow DELTA 3 Max 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, in a van or a garage.
App, UPS and smart features
Same UPS rating and the same extra batteries. The EcoFlow DELTA 3 Max Plus has measured UPS results behind it; the EcoFlow DELTA 3800 Gen4 adds a fridge mode.
One app for both, by Wi-Fi or Bluetooth.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it have a fridge mode? Only the EcoFlow DELTA 3800 Gen4 lists one, and it covers a single compressor appliance with no other AC load advised.
Does it work as a UPS? EcoFlow rates both under 10ms. StorageReview measured 8ms on the EcoFlow DELTA 3 Max Plus; the EcoFlow DELTA 3800 Gen4 has no measurement yet and no HID communication.
Can you add a battery later? The same two battery types fit the EcoFlow DELTA 3 Max Plus and the EcoFlow DELTA 3800 Gen4, with an Expansion Adapter for a pair.
Can it start a generator by itself? Automatic start and stop works on both with a Smart Generator: at 2,600W on the EcoFlow DELTA 3 Max Plus, and at 3,200W over the battery port, never AC, on the EcoFlow DELTA 3800 Gen4.
Can it run a heater or kettle above its rating? The EcoFlow DELTA 3 Max Plus lists 3,800W for heating loads. The EcoFlow DELTA 3800 Gen4 supports X-Boost, but its US page leaves the figure to the manual.
Does it prepare for storms? Yes on both, if you set it up. The version on the EcoFlow DELTA 3800 Gen4 draws on National Weather Service forecasts.
Warranty and support
Same terms: the EcoFlow DELTA 3 Max 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.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 Max Plus.
- Set up the EcoFlow app on day one: registration adds the last 2 years on both.
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 Max Plus, with the source, author and date for each point. UK units charge from 230V outlets, so their charge times don’t apply in the US.
DELTA 3 Max Plus: StorageReview (September 2025), The Technology Man (January 2026, UK unit), Trusted Reviews (January 2026, UK unit), T3 (January 2026), AndroidGuys (November 2025)DELTA 3800 Gen4: no verifiable independent test found
Usable capacity
- Max PlusReviewer A full discharge delivered 1.64kWh from the 2,048Wh pack, about 80 percent. StorageReview, Dylan Dougherty, September 2025
- Max PlusReviewer A constant 2kW heater load ran just over 57 minutes and delivered 1,898Wh, about 93 percent. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Discharge efficiency hovered around 87 percent at loads from 200W to 3,000W. Trusted Reviews, David Ludlow, January 2026, UK unit
- Max PlusReviewer Best round-trip efficiency, AC in to AC out, was 79.9 percent. Trusted Reviews, David Ludlow, January 2026, UK unit
- Max PlusReviewer Reports about 1,740Wh via AC (85 percent) and 1,830Wh via DC (89 percent). AndroidGuys, Scott Webster, November 2025
Charging
- Max PlusReviewer Refilling from empty took 2.33kWh from the wall, about 88 percent charging efficiency. StorageReview, Dylan Dougherty, September 2025
- Max PlusReviewer Fast mode reached 80 percent in 50 minutes and full in about 70 minutes on UK mains. Flag: 230V, up to 2300W input. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Charging at 2,400W took 2,317Wh of input to fill the battery, 88.39 percent efficient. Flag: UK 230V input. Trusted Reviews, David Ludlow, January 2026, UK unit
- Max PlusReviewer The reviewer confirmed roughly 80 percent in about 47 minutes on AC. Likely UK unit (2,300W input quoted). T3, Matt Kollat, January 2026
Noise and heat
- Max PlusReviewer Even charging at full power, the meter barely registered above room noise at one metre; exhaust measured just over 40°C. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Fans almost never came on with a home office load and stayed silent during a brief spike over 3kW. T3, Matt Kollat, January 2026
UPS and output
- Max PlusReviewer Measured UPS transfer time was 8ms on a workstation load. StorageReview, Dylan Dougherty, September 2025
- Max PlusReviewer Oscilloscope measurement showed a clean handover at 8.4ms; a desktop PC under benchmark load stayed on. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Inverter idle draw with no load was about 22W (100 to 87 percent in 12 hours). The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer DC output via the Anderson port delivered 1,892Wh on a 20A load, about 92 percent. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Notes user reports that some desktop PCs and NAS devices still reboot on switchover, despite the sub-10ms claim. AndroidGuys, Scott Webster, November 2025
Practical limits before you buy
- A pre-order won’t help on Friday. For a trip or a storm this week, look at the 3800 Gen4 status pill at the top of the page first.
- The Max Plus has no 30A outlet. An RV shore cord needs an adapter, and each outlet stops at 20A.
- No battery lifts the Max Plus past 3,000W. Capacity grows, output doesn’t. The same goes for 3,600W on the 3800 Gen4.
- The Max Plus’s 378W is shared between the Anderson port and the 12V socket.
- Its 800W alternator input needs an adapter, and the charger is sold separately.
- The 3800 Gen4’s alternator figure is 500W through the solar port, per EcoFlow’s compatibility note.
- The DELTA Pro 3 Extra Battery showed as unavailable on November 5, 2026. With two DELTA 3 Max Plus batteries, the systems stop at 6,144Wh and 7,859Wh.
- The Max Plus includes no solar cable. EcoFlow’s bundles add the matching cables.
- 70+ hours on a fridge is EcoFlow’s empty-fridge number for the 3800 Gen4. Don’t plan on it.
- This is a 120V pair. A 240V well pump or dryer is out for both.
- Years 4 and 5 of the warranty depend on registering in the EcoFlow app, on both.
Frequently asked questions
What is the difference between the DELTA 3 Max Plus and the DELTA 3800 Gen4?
The 3800 Gen4 stores 3,763Wh against 2,048Wh, delivers 3,600W against 3,000W, has a 30A outlet and takes 2,000W of solar against 1,000W. The Max Plus weighs 48.7 lb against 67.5 lb, and has a 12V socket and a 30A Anderson port.
Which is cheaper?
The EcoFlow DELTA 3 Max Plus costs $550 less today: $1,149, against $1,699 for the EcoFlow DELTA 3800 Gen4. Per Wh, the 3800 Gen4 is cheaper: $0.45, against $0.56. Prices refresh daily.
Is the 3800 Gen4 bigger than the Max Plus?
Barely, on EcoFlow’s dimensions: about 38 L against about 36.5 L. The Max Plus is longer and slimmer, at 19.4 × 9.5 × 12.0 in, against 16.77 × 11.36 × 12.09 in. The weight gap is the real one, 18.8 lb.
Should I buy a Max Plus and add a battery, or a 3800 Gen4?
Add a battery if you want the lighter pieces, 12V ports or the option to travel with half the system. Buy the 3800 Gen4 if you want 3,600W, a 30A outlet and one box. The price section compares both routes at today’s prices.
Does my DELTA 3 Max Plus battery work with the 3800 Gen4?
EcoFlow lists the DELTA 3 Max Plus Smart Extra Battery as compatible with the 3800 Gen4, and the 3800 Gen4 page sells it as an add-on.
Which is better for van life?
The Max Plus: lighter, 12V and Anderson ports, and 800W from the alternator. The 3800 Gen4 makes sense if the van has a 120V system on a 30A inlet and a big solar array.
Which is better for home backup?
The 3800 Gen4: about 23 hours on a 140W essentials plan against about 12, and 600W more output.
Which handles motors better?
The 3800 Gen4 on paper, with a 7,200W surge against 6,000W. Compare your motor’s start-up draw with both.
Has anyone reviewed them?
The Max Plus, yes, including StorageReview, The Technology Man, Trusted Reviews and T3. 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 Max Plus are credited. Prices and availability were checked on November 5, 2026.
- Specs: EcoFlow US, DELTA 3 Max Plus, EcoFlow US, DELTA 3800 Gen4 and EcoFlow US, DELTA 3 Max Plus Smart Extra Battery, with their specs, footnotes and FAQ, read on November 5, 2026.
- Volumes and weights of the two-box route are our math from EcoFlow’s figures: 22.1 kg plus 16 kg, about 36.5 L plus about 23 L.
- Alternator refill times are rated input divided into capacity, with no losses; EcoFlow publishes no such time for either.
- Reviewer reports on the DELTA 3 Max Plus: StorageReview, Dylan Dougherty, September 2025, The Technology Man, Gidon, January 2026, UK unit, Trusted Reviews, David Ludlow, January 2026, UK unit, T3, Matt Kollat, January 2026, AndroidGuys, Scott Webster, November 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).
About the same space: 2,048Wh you can lift with 12V ports, or 3,763Wh and 3,600W you leave in place.
Prices checked November 13, 2026 at 6:29 AM EST
Looking at other models? Browse all power station comparisons, or pick any two models on the hub and we point you to the right duel.
Originally published: November 7, 2026