DELTA 3 Classic
- your solar setup will stay at 500W or less
- you power a few things at once (it has 3 AC outlets)
- 1,024Wh will stay enough for you, since it can’t take extra batteries
DELTA 3 Plus
- you’ll run more than 500W of panels (it takes 1,000W)
- you need 6 AC outlets plus a 12V car socket
- you may want more capacity later (up to 5kWh)
Prices and stock checked by our price engine on November 5, 2026 at 6:30 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Buy the Plus for its ports, not for its battery. The battery is the same.
$240 separates the EcoFlow DELTA 3 Classic from the DELTA 3 Plus, and it buys a second solar port, seven more outputs and the right to add batteries later. For a CPAP, a laptop or a short outage, the Classic does the exact same job tonight.
Below: every difference with numbers, a 20-second calculator for your own gear, six modeled situations, and what reviewers and early owners report.
Same battery, same 1,800W inverter. The Plus costs $240 more and buys three things: twice the solar input, seven more outputs and battery expansion.
- your panels add up to 500W or less
- three AC outlets cover what you plug in
- you want it now, and $240 back in your pocket
- you will run more than 500W of solar (it takes 1,000W)
- you need six AC outlets or a 12V car socket
- you may add batteries later, up to 5kWh
The five differences that decide it
The five gaps that decide the purchase, with the better spec for most buyers flagged. Nine smaller differences and the full spec sheet come after the calculator. The battery, the 1,800W inverter and the 10ms UPS are identical.
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. Same capacity in both, so one column serves the Classic and the Plus.
Same battery, same runtime.
The Classic and the Plus both hold about 870Wh usable, so every appliance runs just as long on either one.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
Same 1,024Wh battery: the EcoFlow DELTA 3 Classic costs $240 less than the EcoFlow DELTA 3 Plus.
Prices refresh daily from EcoFlow US.2 x Classic costs $150 less today.
EcoFlow US doesn’t publish a cycle rating for the Classic, so we skip the price-per-cycle card. Two Classics give you 2,048Wh and two separate 1,800W inverters; the price section compares that route with a Plus and an extra battery. The catch: two boxes, two chargers, and no shared battery, so you can’t pool their capacity on one appliance.
The third option: the plain DELTA 3 at $579
EcoFlow DELTA 3: $579 today
According to its user manual (model EF-DL-H10-3), the DELTA 3 has the same 6 AC outlets, 12V car socket, extra battery port and 4,000-cycle rating as the Plus. What it lacks is the Plus’s second solar port: it tops out at 500W of solar, like the Classic. If you want expansion and the full set of ports but will never run more than 500W of panels, it sits $100 above the Classic. It is also $140 below the Plus. Our DELTA 3 review and DELTA 3 vs DELTA 3 Plus go deeper. See the DELTA 3 at EcoFlow.
Six 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
Neither unit covers a full day alone. Only the Plus can be extended to get through the night.
CPAP, two nights
A tie. The Classic does this job as well. With the humidifier on, count roughly half the nights.
Weekend off-grid with 400W of panels
Identical. With 500W of panels or less, the Plus’s second solar port does nothing for you.
Weekend off-grid with 800W of panels
This is where the Plus pulls ahead: it banks 60% more energy from the same roof or campsite.
Two nights in an RV or van
Same capacity, but not the same wiring. The Plus runs the fridge straight from its 12V socket. The Classic has no 12V output, so the fridge needs its AC brick, which adds a conversion step. With 400W of panels on the roof, both refill about 1,400Wh of it by evening.
A day on a job site
Both last the day. The difference is the saw’s startup spike: the Plus is rated for 3,600W of surge, the Classic for 3,000W per its manual. A 15-amp saw usually starts under either, but the Plus has more margin.
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 Classic and DELTA 3 Plus weight, dimensions and full specifications
Weight: 26.6 lb for the Classic, 27.6 lb for the Plus. Dimensions: 15.6 × 7.8 × 11.2 in for the Classic, 16 × 8.0 × 11 in for the Plus, per their manuals. Everything else is in the sheet below.
EcoFlow DELTA 3 Classic and DELTA 3 Plus full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
DELTA 3 Classic
- DELTA 3 Classic power station1,024Wh, 26.6 lb
- AC charging cable
- Manuals and warranty card
- Solar cable sold separatelyEcoFlow Solar to XT60i cable; a reviewer flagged its absence
- No car charging cablesold separately, per the manual
DELTA 3 Plus
- DELTA 3 Plus power station1,024Wh, 27.6 lb
- AC charging cable
- Manuals and warranty card
- Solar cable sold separatelyincluded with the applicable solar bundles
- No extra battery, no Alternator Chargerboth sold separately; EcoFlow sells bundles
Box contents from the DELTA 3 Classic and DELTA 3 user manuals; EcoFlow’s US page shows the Plus’s contents only as an image. Bundles with a panel, an extra battery or a charger come with the matching cables.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
Both: wall and solar together, solar takes priorityBoth: charging speed limiter in the app
Our solar times assume panels deliver 70% of their rating, which is typical on a clear day. EcoFlow’s own figures assume ideal sun. Generator times are EcoFlow’s input ratings applied to 1,024Wh.
Every port, side by side
DELTA 3 Classic
DELTA 3 Plus
Practical consequence: on the Classic, a USB-C laptop and a phone fill both USB-C ports, and anything else goes through the three AC outlets. On the Plus, a 12V fridge, a CPAP on DC and a router on DC5521 can all run without touching the inverter, which is quieter and wastes less energy.
09 · NoiseNoise and heat: Classic vs Plus
Same rating on paper: EcoFlow puts both at 30dB or less at 600W. Reviewers found the EcoFlow DELTA 3 Classic quiet at light loads, while two heard the EcoFlow DELTA 3 Plus‘s fans run with little or nothing plugged in.
Fan behavior on the Plus seems to vary by unit and firmware; one owner says noise was never an issue.Every figure we found, with its source
What reviewers heard: Clearly audible under heavy load or fast AC charging, with fans heard on an 1,825W grill (Basic Tutorials); several reviewers call it quieter than the DELTA 2.
What reviewers heard: Fans ran with little or nothing plugged in (T3); audible over a 700W vacuum but silent charging a laptop (How-To Geek); never an issue for one Amazon UK owner.
Measured by a tester Brand figure
- Cap the AC charging speed in the app: a slower charge runs cooler and quieter overnight.
Cold, heat and storage: Classic vs Plus
Only the EcoFlow DELTA 3 Classic has a published range: it charges from 32°F to 113°F and runs from 14°F to 113°F. EcoFlow US publishes none for the EcoFlow DELTA 3 Plus, but its battery pack is rated IP65.
Classic figures from its manual (EF-DL3-C). For the Plus, the regular DELTA 3’s windows (same platform) are given for context only.- In a garage or a vehicle in winter, bring either one inside to charge.
- For storage, keep it between 68°F and 86°F with some charge left, and run a full charge and discharge every three months, per EcoFlow’s manuals.
App, UPS and smart features
The EcoFlow DELTA 3 Plus does more: it takes extra batteries, lists time-of-use scheduling and tells a PC or NAS when to shut down. The EcoFlow DELTA 3 Classic matches it on UPS speed and Storm Guard.
Same EcoFlow app, same 10ms UPS.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Can you add a battery later? The EcoFlow DELTA 3 Plus takes DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 extra batteries, up to about 5kWh; the EcoFlow DELTA 3 Classic can never be expanded.
Can it tell a PC or NAS to shut down? The EcoFlow DELTA 3 Plus adds HID over USB, so a computer or NAS sees it as a UPS and shuts down cleanly, set up with PowerManager and NUT; EcoFlow lists no such link for the Classic.
Can it charge off-peak? EcoFlow lists time-of-use scheduling on the EcoFlow DELTA 3 Plus only: it charges at off-peak rates and runs what is plugged into the station, not your house circuits. Both offer scheduled charging.
Does it work as a UPS? Both switch to battery within 10ms when the wall drops, which covers PCs, routers, modems and NAS boxes. Neither cleans up voltage dips the way an online UPS does.
Does it prepare for storms? Both have Storm Guard, which starts a charge when a weather alert hits your area; it needs Wi-Fi.
Can it run a heater or kettle above its rating? Both run resistive loads past the rating with X-Boost: up to 2,600W on the EcoFlow DELTA 3 Classic, 2,200W on the EcoFlow DELTA 3 Plus.
Warranty and support
The EcoFlow DELTA 3 Plus has 5 years with nothing to do; the EcoFlow DELTA 3 Classic gets 3 years, plus 2 more if you register it in the EcoFlow app.
Same 5 years at best. Only the Classic asks you to do something to get them.Subject to each brand’s warranty terms and eligibility.
EcoFlow rates the DELTA 3 Plus at 4,000 cycles to 80%, about 11 years at one full cycle a day. EcoFlow US doesn’t publish a cycle rating for the DELTA 3 Classic. Calendar aging and operating conditions also affect capacity.
- If you choose the DELTA 3 Classic, register it in the EcoFlow app the day it arrives: without registration, the warranty stops at 3 years.
- The DELTA 3 Plus needs no registration to get its full 5 years.
What owners and reviewers report
We have not lab-tested these two units. Here is what people who used them found, with the source for each point.
Plus: EcoFlow US 11 reviews, 4.8/5 (Oct 30, 2026) · Amazon UK 4.5/5 from 210 ratingsClassic: EcoFlow US 3 reviews · Best Buy “reviews coming soon”
Noise and heat
- PlusReviewer Fans ran even with little or nothing plugged in; as an always-on UPS they kicked in roughly every minute. T3, Matt Kollat, January 2025, UK unit, over a month
- PlusReviewer Fan audible over a 700W vacuum; the unit ran warmer than expected at light loads, silent while charging a laptop. How-To Geek, Mark LoProto, January 2025, US unit
- PlusOwner Upgrading from a DELTA 2: fan noise was never an issue. Amazon UK, March 2026, quoted via portable-powerstation.co.uk
- ClassicReviewer An 1,825W grill ran the battery flat in a little over 30 minutes, fans clearly audible indoors. Basic Tutorials, March 30, 2026, EU unit
- ClassicOwner Quieter than the DELTA 2 under load, according to early UK reviews. Early UK reviews, quoted via portable-powerstation.co.uk, October 2026
Charging
- PlusReviewer Wall charging hit 1,350 to 1,400W and filled the unit in about an hour. How-To Geek, January 2025
- PlusReviewer The 800W car charger never reached 800W in an older car. How-To Geek, January 2025
- PlusOwner Van use with a 175W panel and a 500W alternator charger every weekend, no failures. Amazon UK, November 2025, quoted via portable-powerstation.co.uk
- ClassicReviewer Wall charging to 100% took just under 55 minutes. Basic Tutorials, March 2026, EU unit
Reliability
- PlusOwner AC outlets switched off on their own around 30% battery, over five to six weeks, with port memory on; support could not explain it. Amazon UK, May 2026, quoted via portable-powerstation.co.uk
- PlusOwner The UPS carried essentials through three or four outages a year. Amazon UK, March 2026, quoted via portable-powerstation.co.uk
- ClassicNote The Classic launched in March 2026, so long-term owner feedback is still thin. We’ll add it as it comes in. BackupPowerHub
Build and daily use
- PlusReviewer Praised: the sliding flap over the inputs and extra batteries that stack cleanly on top. T3, January 2025
- ClassicReviewer Clean seams, sturdy handles, a rear flap that feels solid but a little delicate. Missed: no 12V output and no solar cable in the box. Basic Tutorials, March 2026
Practical limits before you buy
- The Classic can never be expanded. It has no extra battery port. Its Best Buy listing states it is not compatible with DELTA 2 or DELTA 3 Extra Batteries. Buy it only if 1,024Wh will stay enough.
- The Classic has a single input for solar and car. One XT60i port handles both, so you can’t charge from panels and your car at the same time.
- No 12V outlet on the Classic. A 12V cooler or fridge has to run through the AC inverter and its brick, which wastes some energy and keeps the inverter awake.
- The surge rating depends on where you read it. The Classic’s manual says 3,000W surge; EcoFlow’s product page says 3,600W. Plan on 3,000W for motor startups.
- The base DELTA 3 Plus was on pre-order on our October 29, 2026 check. On October 30, 2026, EcoFlow US listed it as shipping in late November, while the Classic ships now. Bundles with a solar panel or an extra battery had different dates.
- Both work as standby UPS units (EcoFlow’s manual describes the Classic this way). They switch to battery within 10ms when the grid drops, which suits PCs, routers and NAS boxes. They don’t clean up voltage dips the way an online UPS does.
- The DELTA 3 Plus’s AC outlets are rotated so bulky plugs don’t block each other. The Classic’s three outlets sit in a row.
- Register the Classic. Its 5-year warranty is 3 years out of the box plus 2 years after registration in the app.
Frequently asked questions
Can I add an extra battery to the DELTA 3 Classic?
No. The Classic has no expansion port, and EcoFlow lists it as not compatible with DELTA 2 or DELTA 3 Extra Batteries. If you want more capacity later, choose the DELTA 3 or the DELTA 3 Plus.
Is the DELTA 3 Plus worth the extra money?
Only if you’ll use what it adds: solar above 500W, more than 3 AC outlets, a 12V socket, or extra batteries. For a CPAP, a laptop or short outages, the Classic does the same job. And if you want the ports and the expansion without the 1,000W solar, the plain DELTA 3 is another option; the price section has today’s prices.
How long will a DELTA 3 Classic or DELTA 3 Plus run a refrigerator?
Using a 60W average draw and an estimated 870Wh of usable capacity, either base unit provides about 15 hours. Actual runtime varies with the refrigerator, room temperature, compressor cycling and inverter losses. Both have 1,800W of output, far more than a fridge needs once running.
Which extra batteries work with the DELTA 3 Plus?
EcoFlow lists the DELTA 3, DELTA 2, DELTA 2 Max and DELTA Pro 3 Extra Batteries, for up to about 5kWh in total. Some of them need the XT150 cable sold with the Alternator Charger.
Are they the same size?
Practically. The Classic measures 15.6 x 7.8 x 11.2 inches and the Plus 16 x 8.0 x 11 inches, per their manuals. The Plus weighs 1 lb more (27.6 lb against 26.6 lb).
Can I charge them below freezing?
No. Charging is allowed from 32°F up. Discharging works down to 14°F. In winter, charge indoors.
Will third-party solar panels work?
Yes on both, through the XT60i input: 11 to 60V and up to 15A per port. Stay under 60V open-circuit voltage when you wire panels in series. The Classic takes one panel string, the Plus takes two.
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 user manuals; usage observations are attributed to named reviewers and owners. Prices and availability were checked on October 30, 2026.
- Specs: EcoFlow US, DELTA 3 Classic and EcoFlow US, DELTA 3 Plus, read on October 30, 2026.
- Ports, surge, inputs and temperatures of the Classic: EcoFlow DELTA 3 Classic user manual, model EF-DL3-C (US version). DELTA 3 figures: EcoFlow DELTA 3 user manual, model EF-DL-H10-3.
- Classic compatibility and cycle rating: the DELTA 3 Classic listing on Best Buy, read on October 30, 2026.
- Reviewer reports: T3 and How-To Geek on the DELTA 3 Plus; Basic Tutorials on the DELTA 3 Classic.
- Owner reports: Amazon UK reviews as quoted by portable-powerstation.co.uk (Plus) and its Classic roundup. UK units share the battery and inverter with US units; outlets and warranty terms differ.
- Runtime = capacity × 0.85 ÷ watts. Solar harvest = min(panel watts, max input) × sun hours × 0.70. Cost per lifetime kWh = price ÷ (cycles × 1.024kWh). Service life = cycles ÷ 365.
Same 1,024Wh and 1,800W. The Plus adds solar, ports and expansion for $240 more.
Prices checked November 5, 2026 at 6:30 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 3, 2026