EcoFlow Our score 8.4/10 #9 of 17 mid-size for real capacity
EcoFlow DELTA 3 Plus
Updated
A 1 kWh station built for solar and for growing later: two solar inputs totaling 1,000 W, and a port for extra batteries up to about 5 kWh.
Independent tests put this portable power station's usable capacity at 875 Wh, 85% of the rated 1,024 Wh (the median of 2 tests).
Real capacity
875of 1,024 Wh
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StorageReview
89%
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The Solar Lab
82%
AC output
1,800 W
More than 5 of the 16 other mid-size models we review. 3,600 W surge.
Cost per usable Wh
$0.82
#27 of 33 models we've priced.
PriceyWeight
27.6 lb
32 usable Wh per lb
Battery
LiFePO4
Long-life chemistry
Warranty
5 years
Wall charge
56 min
At the maximum 1,500 W wall input.
How much of the 1,024 Wh do you get?
Each bar is the full rated capacity. Blue is what the tester measured coming out of the AC outlets; the striped end is what was lost.
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StorageReview (Dylan Dougherty) 910 Wh · 89%
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The Solar Lab 82%
How long will it run your devices?
Add what you want to power and see how long the EcoFlow DELTA 3 Plus lasts on its tested 875 Wh, counting the power it uses on itself and any solar panels you add.
1 more result we found but don't count
| Tester | Result | Why it's not counted |
|---|---|---|
| Trusted Reviews (Harry Duncton) Feb 11, 2025 | 888 Wh 87% | UK unit (230 V), cross-check only |
Our score: 8.4 out of 10
Worked out from the tested capacity and the specs on this page, compared with the other models we track. Capacity, power and charging are compared with the 17 mid-size models; battery, build and features with all 37. Price isn't part of it. How we score.
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Capacity and power 35% of the score 7.5
What goes into capacity and power Measure This model Score Tested usable capacity 60% 875 Wh 7.2 Continuous AC output 25% 1,800 W 7.5 AC surge 15% 3,600 W 8.5 Compared with the 17 mid-size models we track. Scores run from 5 to 10; 7.5 is the middle of the group.
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Charging 25% of the score 9.2
What goes into charging Measure This model Score Wall charge to full 40% 56 min 8.8 Max solar input 35% 1,000 W 9.7 UPS switchover 25% 10 ms 9.0 Compared with the 17 mid-size models we track. Scores run from 5 to 10; 7.5 is the middle of the group.
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Battery and build 25% of the score 8.7
What goes into battery and build Measure This model Score Battery type 30% LiFePO4 10.0 Cycle life to 80% 25% 4,000 cycles 8.6 Warranty 25% 5 years 8.5 Usable Wh per lb 20% 32 Wh/lb 7.0 Compared with all 37 models we track. Scores run from 5 to 10; 7.5 is the middle of the group.
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Features 15% of the score 8.8
What goes into features Measure This model Score Expandable battery 25% Yes 10.0 AC + USB-C outlets 20% 8 9.3 USB-C max output 15% Not known Left out 240 V output 15% No 5.0 App control 15% Yes 10.0 Wheels 10% Not known Left out Compared with all 37 models we track. Scores run from 5 to 10; 7.5 is the middle of the group. Measures we have no figure for are left out.
Pros and cons
Pros
- Expandable to about 5 kWh with EcoFlow's extra batteries.
- Two solar inputs, 1,000 W in total.
- Full wall charge in 56 minutes, according to EcoFlow.
- Battery backup (UPS) mode: StorageReview measured a switchover of just over 8 ms.
- Six AC outlets with 1,800 W continuous output.
Cons
- Costs more per usable watt-hour than the DELTA 3 Classic at the prices we checked.
- EcoFlow quotes 3,600 W surge, but The Solar Lab could only hold 2,600 W, for about a minute.
- At 27.6 lb it's heavier than most 1 kWh rivals.
Who it's for
People who plan to add solar panels or extra batteries, and want a backup unit that can grow with them.
Who should skip it
Skip it if you just want the most usable energy for the money in a 1 kWh unit. Check the DELTA 3 Classic first.
Features
- Battery backup (UPS) mode : yes
- Takes extra batteries : yes
- LiFePO4 battery : yes
- Solar input, 1,000 W : yes
- Car charging : not published
- 240 V output : no
- RV outlet (TT-30) : no
- App control : yes
- Wheels : no
How it compares with other mid-size models
| Model | Usable | Delivered | Price | Value |
|---|---|---|---|---|
| EcoFlow DELTA 3 Plus 1,024 Wh rated | 875 Wh | 85% | $719 | Pricey |
| UDPower C600 596 Wh rated | 497 Wh | 83% | – | No price checked yet |
| Duracell G800 620 Wh rated | 503 Wh | 81% | $699 | Pricey |
| Goal Zero Yeti 700 677 Wh rated | 560 Wh | 83% | $699.95 | Pricey |
| Dabbsson 600L 768 Wh rated | 653 Wh | 85% | $299 | Great value |
| Anker SOLIX C1000 Gen 2 1,024 Wh rated | 880 Wh | 86% | $499.99 | Good value |
| BLUETTI Elite 100 V2 1,024 Wh rated | 890 Wh | 87% | $489 | Good value |
| DJI Power 1000 V2 1,024 Wh rated | 840 Wh | 82% | – | No price checked yet |
| EcoFlow DELTA 3 1,024 Wh rated | 885 Wh | 86% | $629 | Fair price |
| EcoFlow DELTA 3 Classic 1,024 Wh rated | 947 Wh | 93% | $499 | Good value |
| OUPES Mega 1 1,024 Wh rated | 809 Wh | 79% | $699 | Pricey |
| OUPES Mega 1 Lite 1,024 Wh rated | 855 Wh | 84% | $599 | Fair price |
| Anker SOLIX C1000 (first gen) 1,056 Wh rated | 950 Wh | 90% | $469.99 | Great value |
| Jackery Explorer 1000 v2 1,070 Wh rated | 923 Wh | 86% | $499 | Good value |
| ALLPOWERS R1500 1,152 Wh rated | 956 Wh | 83% | $539 | Good value |
| BLUETTI AC180 1,152 Wh rated | 991 Wh | 86% | $499 | Good value |
| Jackery Explorer 1000 Plus 1,264 Wh rated | 1,090 Wh | 86% | $619 | Good value |
Questions
How much usable power does the EcoFlow DELTA 3 Plus have?
About 875 Wh. StorageReview measured 910 Wh, and The Solar Lab's run at about 1,573 W worked out to 82% of the rated 1,024 Wh.
How far can the DELTA 3 Plus expand?
EcoFlow says up to 5 kWh with extra batteries. Its manual lists the DELTA 3, DELTA Pro 3, DELTA 2, DELTA 2 Max and DELTA Max extra batteries as compatible.
Can the DELTA 3 Plus work as a UPS?
Yes. EcoFlow quotes a 10 ms switchover, and StorageReview measured just over 8 ms.
Full specs
From the maker's US manual or product page unless noted. Each value links to where we found it.
Capacity and battery
- Rated capacity
- 1,024 Wh
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for Rated capacity)
- Battery type
- LiFePO4 (LFP)
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for Battery type)
- Maximum with extra batteries
- 5,000 Wh EcoFlow says "up to 5 kWh" without an exact figure.
- ecoflow.com (source for Maximum with extra batteries)
Output and ports
- AC output (continuous)
- 1,800 W
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for AC output (continuous))
- AC surge
- 3,600 W The Solar Lab could hold only 2,600 W, for about a minute.
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for AC surge)
- USB-C maximum
- Not published
- RV outlet (TT-30)
- Not published
Charging
- Wall charge to full
- 56 min At the maximum 1,500 W wall input.
- ecoflow.com (source for Wall charge to full)
- Solar voltage range
- up to 60 V Voc, 15 A Isc per XT60i input
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for Solar voltage range)
- Car charging input
- Not published
- Battery backup (UPS) mode
- Yes
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for Battery backup (UPS) mode)
- UPS switchover time
- 10 ms
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for UPS switchover time)
Size and build
- Dimensions
- 15.7 × 8.0 × 11.2 in
- ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com (source for Dimensions)
- Wheels
- Not published
Warranty and certification
- Certifications
- Not published
- Released
- Not published
Where this data comes from
Capacity figures come from the independent testers linked above. We record their numbers, the date and the load, and link to their reports; the testing is theirs. Specs come from EcoFlow's own US documents, and we note where they disagree with each other or with test results. Prices are checked by hand on the brand's US store.