The EcoFlow DELTA Pro is the better portable power station overall, rated 3.7 to 3.1. The EcoFlow DELTA Pro leads on value. The Goal Zero Yeti PRO 4000 wins on solar input and features. The EcoFlow DELTA Pro costs $2,200.95 less ($1,799 vs $3,999.95).
A heavy 3.6kWh station built for home backup that can grow into a 25 kWh system. It still makes sense if you want that expansion path, but newer models give similar capacity for less.
Amazon $1,799For 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 $3,999.95Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
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 | Goal Zero Yeti PRO 4000 |
|---|---|---|
| Overall rating | 3.7/5 | 3.1/5 |
| Value 25% | 69 $0.50 per rated Wh | 0 $1.00 per rated Wh |
| Tested capacity 15% | 66 84% of rated capacity delivered (2 tests) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 96 LiFePO4, 3,500 cycles, 5-year warranty | 100 LiFePO4, 4,000 cycles, 5-year warranty |
| AC output 15% | 37 3,600 W continuous AC | 37 3,600 W continuous AC |
| Charging speed 10% | 41 0-100% on AC in 2 h 42 min | 44 0-100% on AC in 2 h 36 min |
| Portability 10% | 64 80 Wh per kg (99 lb (45 kg)) | 56 76 Wh per kg (115.7 lb (52.5 kg)) |
| Solar input 5% | 35 1,600 W max solar input | 71 3,000 W max solar input |
| Features 5% | 65 expandable, 100 W USB-C, app | 100 UPS (15 ms), expandable, 100 W USB-C, app |
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 3,060 Wh | 85% | AC discharge test; the review’s spec table lists 2,950 Wh. Measured AC recharge took a little over 2 hours. |
| The Solar Lab | - | 84% | AC discharge; load not specified. AC recharge took about 2 h 15 min; idle draw 21W. |
No independent test published yet.
| EcoFlow DELTA Pro | Goal Zero Yeti PRO 4000 | |
|---|---|---|
| Battery | ||
| Rated capacity | 3,600 Wh | 3,993.6 Wh |
| Tested usable capacity | 3,042 Wh (84%) | - |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 3,500 to 80% (6,500 to 50%) | 4,000 to 80% |
| Expandable | Yes, up to 25,000 Wh | Yes, up to 19,968 Wh |
| Output | ||
| AC output | 3,600 W (7,200 W surge) | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | 4,500 W | - |
| AC outlets | 5 total | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| AC waveform | Pure sine wave | Pure sine wave |
| USB-C ports | 2 (up to 100 W each) | 3 (up to 100 W each) |
| USB-A ports | 4 | 3 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | 2 | 0 |
| UPS / pass-through | - | Yes (15 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Full AC charge time | 2 h 42 min (2.7 h at 1800W on 120V; 1.8 h at 3000W on 240V) | 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 | 1,600 W | 3,000 W |
| Solar input voltage | 11-150V, 15A | HPP 13.3-150V (3000W) + 8mm 12.3-28V (275W) |
| Car charging | 96 W | - |
| Build | ||
| Weight | 99 lb (45 kg) | 115.7 lb (52.5 kg) |
| Dimensions | 25 x 11.2 x 16.4 in | 21.4 x 13.8 x 14.8 in (with removable cart: 18.1 in tall, 125.7 lb) |
| App | EcoFlow app (Wi-Fi and Bluetooth) | Goal Zero Power app |
| Warranty | 5 years | 5 years |
| Released | 2021 | 2023-10 |
