EcoFlow DELTA Pro 3
#15 in Home backupFull review
For households that want a single wheeled unit able to back up 240V circuits and expand toward whole-home capacity.
Amazon $2,799 EcoFlow $2,799$2,799
The EcoFlow DELTA Pro 3 is the better portable power station overall, rated 3.8 to 3.1. The EcoFlow DELTA Pro 3 leads on value and AC output. The Goal Zero Yeti PRO 4000 wins on solar input. The EcoFlow DELTA Pro 3 costs $1,200.95 less ($2,799 vs $3,999.95).
Goal Zero Yeti PRO 4000
#28 in Home backupFull review
For RV owners and home-backup buyers who want a rugged 4 kWh station with a 30A RV outlet and room to expand, and who won’t be lifting it often.
Amazon Goal Zero $3,999.95$3,999.95
Prices were last checked October 20, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the EcoFlow DELTA Pro 3 for value ($0.68 per rated Wh vs $1.00 per rated Wh) and AC output (4,000 W continuous AC vs 3,600 W continuous AC).
- Choose the Goal Zero Yeti PRO 4000 for solar input (3,000 W max solar input vs 2,600 W max solar input).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every home backup portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | EcoFlow DELTA Pro 3 | Goal Zero Yeti PRO 4000 |
|---|---|---|
| Overall rating | 3.8/5 | 3.1/5 |
| Value 25% | 41 $0.68 per rated Wh | 0 $1.00 per rated Wh |
| Tested capacity 15% | 100 93% of rated capacity delivered (1 test) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 100 LiFePO4, 4,000 cycles, 5-year warranty | 100 LiFePO4, 4,000 cycles, 5-year warranty |
| AC output 15% | 46 4,000 W continuous AC | 37 3,600 W continuous AC |
| Charging speed 10% | 50 full AC charge time not published (neutral score used) | 44 0-100% on AC in 2 h 36 min |
| Portability 10% | 63 80 Wh per kg (113.5 lb (51.5 kg)) | 56 76 Wh per kg (115.7 lb (52.5 kg)) |
| Solar input 5% | 57 2,600 W max solar input | 71 3,000 W max solar input |
| Features 5% | 100 UPS (10 ms), expandable, 100 W USB-C, app | 100 UPS (15 ms), expandable, 100 W USB-C, app |
Independent capacity tests
EcoFlow DELTA Pro 3
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 3,790 Wh | 92.5% | Full-discharge AC test; OutdoorGearLab states over 93%, 3790/4096 works out to 92.5%. Recharged from empty in about 3.2 h at about 1600W peak. |
Goal Zero Yeti PRO 4000
No independent test published yet.
Specifications
| EcoFlow DELTA Pro 3 | Goal Zero Yeti PRO 4000 | |
|---|---|---|
| Battery | ||
| Rated capacity | 4,096 Wh | 3,993.6 Wh |
| Tested usable capacity | 3,790 Wh (93%) | - |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 to 80% | 4,000 to 80% |
| Expandable | Yes, up to 12,000 Wh | Yes, up to 19,968 Wh |
| Output | ||
| AC output | 4,000 W (8,000 W surge) | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | 6,000 W | - |
| AC outlets | 7 total | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| 120/240V 30A twist-lock (NEMA L14-30R) | 1 | - |
| 240V 20A outlet (NEMA 6-20R) | 1 | - |
| AC waveform | - | Pure sine wave |
| USB-C ports | 2 (up to 100 W each) | 3 (up to 100 W each) |
| USB-A ports | 2 | 3 |
| 12 V car outlet | - | Yes |
| DC5521 ports | 1 | - |
| UPS / pass-through | Yes (10 ms switchover) | Yes (15 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Full AC charge time | - | 2 h 36 min (2.6 h full per Goal Zero comparison chart (user guide says about 3 h); 0-80% in 2 h) |
| Max solar input | 2,600 W | 3,000 W |
| Solar input voltage | HV 30-150V (1600W) + LV 11-60V (1000W) | HPP 13.3-150V (3000W) + 8mm 12.3-28V (275W) |
| Build | ||
| Weight | 113.5 lb (51.5 kg) | 115.7 lb (52.5 kg) |
| Dimensions | 27.28 x 16.16 x 13.43 in | 21.4 x 13.8 x 14.8 in (with removable cart: 18.1 in tall, 125.7 lb) |
| App | Wi-Fi + Bluetooth | Goal Zero Power app |
| Warranty | 5 years | 5 years |