EcoFlow DELTA 3 vs DELTA 3 Plus: which one to buy
Two EcoFlow power stations with the same battery and the same output. We line up every figure the maker publishes and show the few that differ.
Buy the EcoFlow DELTA 3 for home backup. In an outage the two are the same: the same battery, the same output and the same verdict against a refrigerator for an 8-hour working-day outage, “Clears the best case only”. The EcoFlow DELTA 3 Plus adds solar input, 1,000 W against 500 W, and faster USB-C ports. Pay for it only if you will refill from a big solar array.
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| Model | Usable | Output | Typical day | Per usable kWh | Price | |
|---|---|---|---|---|---|---|
| Our pick |  EcoFlow DELTA 3 | 870 Wh | 1,800 W | one charge | $688 | $599 at Amazon |
| If you run big solar |  EcoFlow DELTA 3 Plus | 870 Wh | 1,800 W | one charge | — | no verified listing |
Which DELTA 3 is which
EcoFlow sells the DELTA 3 under seven names: Classic, the plain DELTA 3, Plus, Max, Max Plus, Ultra and Ultra Plus. They look alike and differ in battery, output and solar input. Each row is set against the plain DELTA 3.
| Model | Battery | Output | Solar input | Against the DELTA 3 | Amazon |
|---|---|---|---|---|---|
 EcoFlow DELTA 3 ClassicCompared here | 1,024 Wh | 1,800 W | 500 W | Same battery, same output, same solar input | $499 at Amazon |
| EcoFlow DELTA 3 | 1,024 Wh | 1,800 W | 500 W | The base model this page compares | $599 at Amazon |
| EcoFlow DELTA 3 Plus Compared here | 1,024 Wh | 1,800 W | 1,000 W | Same battery, same output, more solar input | no verified listing |
 EcoFlow DELTA 3 MaxCompared here | 2,048 Wh | 2,400 W | not listed by the maker | 2× the battery, more output, solar input not listed by the maker | $879 at Amazon |
 EcoFlow DELTA 3 Max PlusCompared here | 2,048 Wh | 3,000 W | not listed by the maker | 2× the battery, more output, solar input not listed by the maker | $1,149 at Amazon |
 EcoFlow DELTA 3 UltraCompared here | 3,072 Wh | 3,600 W | 800 W | 3× the battery, more output, more solar input | $1,349 at Amazon |
 EcoFlow DELTA 3 Ultra PlusCompared here | 3,072 Wh | 3,600 W | 1,600 W | 3× the battery, more output, more solar input | $1,579 at Amazon |
Figures from each maker page (linked on each model page). Prices checked October 3, 2026. Every EcoFlow model on Amazon in one table: which EcoFlow to buy.
Who this is for
You are choosing between these two and want to know what the extra money buys. Short answer: solar input and USB-C speed, not runtime. Our family page sets these against the Classic and the Ultra.
What is the same and what is different
| EcoFlow DELTA 3 | EcoFlow DELTA 3 Plus | |
|---|---|---|
| Amazon price, bare unit | $599 (checked October 3, 2026) | no verified listing |
| Battery (same) | 1,024 Wh (870 usable) | 1,024 Wh (870 usable) |
| Output (same) | 1,800 W, 3,600 W peak | 1,800 W, 3,600 W peak |
| Verdict, fridge plan above (same) | Clears the best case only | Clears the best case only |
| Solar input | 500 W | 1,000 W |
| Wall charging (same) | 1,500 W | 1,500 W |
| USB-C | 2 ports, 100 W max | 140W max per USB-C port, 280W combined across both |
| Extra-battery port | Yes, up to 5 kWh with an EcoFlow Extra Battery | Yes, via XT150 port; expandable up to 5 kWh total |
| UPS switchover | Under 10 ms UPS switchover | 10 ms rated; bench-tested at just over 8 ms |
| Warranty | 5 years | 5-year warranty |
| Weight (same) | 28 lb | 28 lb |
Maker figures from EcoFlow DELTA 3: us.ecoflow.com, captured August 13, 2026; EcoFlow DELTA 3 Plus: us.ecoflow.com, captured August 12, 2026; USB-C, switchover, extra-battery and warranty rows from the maker pages and manuals cited under each pick. Prices are the Amazon listings we matched to the bare unit; Amazon shows today’s price.
Side by side, from the makers’ own documents
“Not listed by the maker” means the maker pages we read do not state it. It is not a zero, and we never fill it from a sibling model. “No verified listing” means no Amazon listing for the bare unit matched the bare unit by name, battery and output yet.
| Model | Battery | Continuous output | Peak output | Weight | Solar input | Expandable | Warranty | Chemistry | Verified listing |
|---|---|---|---|---|---|---|---|---|---|
| EcoFlow DELTA 3 | 1,024 Wh | 1,800 W | 3,600 W | 28 lb (12.5 kg) | 500 W | Yes, up to 5 kWh with an EcoFlow Extra Battery | 5 years | LiFePO4 | $599 |
| EcoFlow DELTA 3 Plus | 1,024 Wh | 1,800 W | 3,600 W | 28 lb (12.5 kg) | 1,000 W | Yes, via XT150 port; expandable up to 5 kWh total | 5 years | LiFePO4 | no verified listing |
| EcoFlow DELTA 3 Classic (1024Wh) | 1,024 Wh | 1,800 W | 3,600 W | 27 lb (12.1 kg) | 500 W | Not listed by EcoFlow | 3-year warranty, extendable to 5 years by registering | LiFePO4 | $499 |
Against the same plan
A refrigerator for an 8-hour working-day outage, sized on the harder end of every range.
| Model | Covers the energy | Carries the running load | Clears the surge | Typical day | Verdict |
|---|---|---|---|---|---|
| EcoFlow DELTA 3 | best case only | worst case | Refrigerator/freezer: starts it | one charge | Clears the best case only |
| EcoFlow DELTA 3 Plus | best case only | worst case | Refrigerator/freezer: starts it | one charge | Clears the best case only |
| EcoFlow DELTA 3 Classic (1024Wh) | best case only | worst case | Refrigerator/freezer: starts it | one charge | Clears the best case only |
Where the energy goes, load by load
| Load | Hours | Running watts | Duty cycle | Energy | Share of worst case |
|---|---|---|---|---|---|
| Refrigerator/freezer | 8 | 100–700 | 20–50% | 160–2,800 Wh | 100% |
Energy = running watts × duty cycle × hours, at each end of the range. The right-hand end of every row is what the plan is sized on.
Our pickEcoFlow DELTA 3
Same outage runtime for less
$599 at Amazon, October 3, 20261,024 Wh (870 usable)1,800 W continuous3,600 W peak28 lb
The EcoFlow DELTA 3 runs a fridge exactly as long as the Plus: same battery, same output, same surge. It keeps the extra-battery port, so you can add capacity later. Against a refrigerator for an 8-hour working-day outage it reads “Clears the best case only”.
Our rule: the cheapest unit that covers a typical day of this plan (670 Wh).
One charge covers a typical day of this plan (about 670 Wh). A hard-working refrigerator/freezer may need up to about 2,800 Wh.
Price as of October 3, 2026; the listing we verified as the bare unit.
A refrigerator for an 8-hour working-day outage:
- Energyonly in the best case
- Running loadyes, even in the worst case
- Starting surgeRefrigerator/freezer: starts it
What you give up: Solar input and USB-C speed.
Owner reports and tester figures are on the model page.
Figures from us.ecoflow.com, captured August 13, 2026; recall screen: no published recall names this exact model (screened 2026-10-01) (how we screen, CPSC).
If you run big solarEcoFlow DELTA 3 Plus
More solar input
1,024 Wh (870 usable)1,800 W continuous3,600 W peak28 lb
The EcoFlow DELTA 3 Plus takes 1,000 W of solar across two inputs and has faster USB-C ports. It also works with EcoFlow's desktop software for UPS setup. Against a refrigerator for an 8-hour working-day outage it reads “Clears the best case only”, the same as the EcoFlow DELTA 3.
No Amazon listing for the bare unit has matched the bare unit by name, battery and output, so this page has no price or buy link for it.
A refrigerator for an 8-hour working-day outage:
- Energyonly in the best case
- Running loadyes, even in the worst case
- Starting surgeRefrigerator/freezer: starts it
What you give up: Money. You pay more for the same battery and the same output.
Owner reports and tester figures are on the model page.
Figures from us.ecoflow.com, captured August 12, 2026; recall screen: no published recall names this exact model (screened 2026-10-01) (how we screen, CPSC).
Buying it right
A search for these models returns bundles, sibling models and the same unit under two prices. We link only a listing whose own title states the bare unit with its exact battery and output. Match the model number on the label to this page. How we check a listing.
- EcoFlow DELTA 3: we link the bare unit, checked October 3, 2026. We turned down 9 other listings (bundles, sibling models, repeats); see which and why.
- EcoFlow DELTA 3 Plus: no Amazon listing passed our check, so there is no Amazon link. What we turned down.
What this page can’t promise
Nothing here was tested by us. Every spec is EcoFlow's own, read off its product pages and manual. EcoFlow's DELTA 3 page once served spec figures identical to the Plus's; we list only what each page states for its own model.
Questions people ask
Is the DELTA 3 Plus worth it over the DELTA 3?
Only for solar. The EcoFlow DELTA 3 Plus takes 1,000 W of panels against 500 W and has faster USB-C ports. The battery, the output and the outage runtime are the same.
Do both take an extra battery?
Yes. EcoFlow lists an extra-battery port on both. The DELTA 3 Classic is the one without it.
How long will either one run a fridge?
The same time, because the battery is the same. For a refrigerator for an 8-hour working-day outage, a newer fridge in a cool room needs about 160 watt-hours and either unit covers it. An older fridge in a warm kitchen needs up to 2,800, and neither does on one charge.
Other plans we sized
- Home backup
- Camping and road trips
- CPAP
- Portable generators
- Which EcoFlow DELTA 3? The whole family, judged against one plan (comparison)
- Refrigerator
- Sump pump
- Furnace
- Well pump
- Power station or generator: which do you actually need?
- How to connect a power station to your house
- Solar panels for a power station: how many, and how long
- Expansion batteries: what an extra battery for a power station actually does
EcoFlow DELTA 3Our pick
$599 at Amazon