EcoFlow Our score 9.4/10 #1 of 7 home backup for real capacity
EcoFlow DELTA Pro 3
Updated
A home backup unit on wheels, with 120 V and 240 V output and room to expand to 12 kWh. No home backup unit we track delivered a bigger share of its rated capacity.
Independent tests put this portable power station's usable capacity at 3,809 Wh, 93% of the rated 4,096 Wh (the median of 4 tests).
Real capacity
3,809of 4,096 Wh
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OutdoorGearLab
93%
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Hobotech
93%
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Hobotech
95%
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The Solar Lab
89%
AC output
4,000 W
The most of the 7 home backup models we review. 8,000 W surge.
Cost per usable Wh
$0.73
#25 of 33 models we've priced.
Fair priceWeight
113.5 lb
34 usable Wh per lb
Battery
LiFePO4
Long-life chemistry
Warranty
5 years
Wall charge
–
To full, maker’s figure
How much of the 4,096 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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OutdoorGearLab (Kenji Mowrey) 3,790 Wh · 93%
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Hobotech 3,810 Wh · 93%
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Hobotech 3,880 Wh · 95%
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The Solar Lab 89%
How long will it run your devices?
Add what you want to power and see how long the EcoFlow DELTA Pro 3 lasts on its tested 3,809 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 |
|---|---|---|
| Brains Report not shown | 3,630 Wh 89% | Method not described |
Our score: 9.4 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 7 home backup 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 9.6
What goes into capacity and power Measure This model Score Tested usable capacity 60% 3,809 Wh 9.6 Continuous AC output 25% 4,000 W 9.6 AC surge 15% 8,000 W 9.6 Compared with the 7 home backup 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 9.5
What goes into charging Measure This model Score Wall charge to full 40% Not known Left out Max solar input 35% 2,600 W 9.6 UPS switchover 25% 10 ms 9.3 Compared with the 7 home backup 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.
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Battery and build 25% of the score 8.8
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% 34 Wh/lb 7.5 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 9.5
What goes into features Measure This model Score Expandable battery 25% Yes 10.0 AC + USB-C outlets 20% 9 9.9 USB-C max output 15% 100 W 7.0 240 V output 15% Yes 10.0 App control 15% Yes 10.0 Wheels 10% Yes 10.0 Compared with all 37 models we track. Scores run from 5 to 10; 7.5 is the middle of the group.
Pros and cons
Pros
- Four independent tests on US units, ranging from 89% to 95% of rated capacity.
- 4,000 W continuous at 120 V or 120/240 V, with 8,000 W surge.
- RV (TT-30) and 240 V (L14-30) outlets, so it can feed an RV or a home transfer switch.
- Up to 2,600 W of solar input across two inputs.
- Expandable to 12 kWh with two extra batteries.
Cons
- At about 114 lb it rolls, but you won't lift it alone.
- Fan noise: Hobotech measured 56 dB, well above EcoFlow's 30 dB figure.
- No 12 V car-style socket. 12 V output comes through DC5521 and Anderson ports instead.
Who it's for
Homeowners who want serious backup for an outage, with the option to connect to a transfer switch (installed by a licensed electrician) and add batteries later.
Who should skip it
Skip it if you need something portable for camping, or if a 2 kWh unit would cover what you actually need to run.
Features
- Battery backup (UPS) mode : yes
- Takes extra batteries : yes
- LiFePO4 battery : yes
- Solar input, 2,600 W : yes
- Car charging : yes
- 240 V output : yes
- RV outlet (TT-30) : yes
- App control : yes
- Wheels : yes
How it compares with other home backup models
| Model | Usable | Delivered | Price | Value |
|---|---|---|---|---|
| EcoFlow DELTA Pro 3 4,096 Wh rated | 3,809 Wh | 93% | $2,799 | Fair price |
| Anker SOLIX F3000 3,072 Wh rated | 2,645 Wh | 86% | $1,399.99 | Good value |
| Jackery HomePower 3000 3,072 Wh rated | 2,759 Wh | 90% | $1,349 | Great value |
| Pecron E3600LFP 3,072 Wh rated | 2,734 Wh | 89% | – | No price checked yet |
| Pecron F3000LFP 3,072 Wh rated | 2,550 Wh | 83% | $899 | Great value |
| Jackery HomePower 3600 Plus 3,584 Wh rated | 3,201 Wh | 89% | $1,709 | Good value |
| EcoFlow DELTA Pro 3,600 Wh rated | 2,948 Wh | 82% | $1,799 | Fair price |
Questions
How much usable power does the EcoFlow DELTA Pro 3 have?
About 3,809 Wh. Four tests on US units ranged from 89% to 95% of the rated 4,096 Wh: OutdoorGearLab measured 3,790 Wh, and Hobotech 3,810 Wh on the 120 V outlets and 3,880 Wh on the 240 V output.
Can the DELTA Pro 3 run 240 V appliances?
Yes. It has a 240 V outlet and a 120/240 V L14-30 outlet, and EcoFlow rates it at 4,000 W at 240 V. Connecting it to your home's wiring needs a transfer switch installed by a licensed electrician.
How far can the DELTA Pro 3 expand?
EcoFlow says up to 12 kWh with two extra batteries, or 8 kWh with one.
Full specs
From the maker's US manual or product page unless noted. Each value links to where we found it.
Capacity and battery
- Maximum with extra batteries
- 12,000 Wh EcoFlow's figure with two extra batteries.
- ecoflow.com (source for Maximum with extra batteries)
Output and ports
Charging
- Wall charge to full
- Not published
- Solar voltage range
- High-PV 30–150 V, 15 A; Low-PV 11–60 V, 20 A
- offyourgrid.ie (source for Solar voltage range)
- Car charging input
- 12 V 8 A max or 48 V 20 A max (about 96 W or 960 W, calc)
- offyourgrid.ie (source for Car charging input)
Size and build
- Noise (maker’s figure)
- 30 dB Under 2,000 W, per EcoFlow. Hobotech measured 56 dB of fan noise.
- ecoflow.com (source for Noise (maker’s figure))
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.