OUPES Mega 2 Pro
#8 in LargeFull review
A 2kWh LiFePO4 station with an RV outlet and large expansion for home backup and RV owners on a budget.
OUPES $699$699
The OUPES Mega 2 Pro is the better portable power station overall, rated 4.1 to 3.7. The OUPES Mega 2 Pro leads on value and battery life. The EcoFlow DELTA 3 Max Plus wins on AC output. The OUPES Mega 2 Pro costs $500 less ($699 vs $1,199).
EcoFlow DELTA 3 Max Plus
#25 in LargeFull review
A 2kWh home-backup station with enough output for most household circuits and room to expand to 10 kWh. A good fit for buyers who want to start mid-size and grow later.
Amazon $1,199$1,199
Prices 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.
Which should you buy?
- Choose the OUPES Mega 2 Pro for value ($0.34 per rated Wh vs $0.59 per rated Wh) and battery life (LiFePO4, 4,000 cycles, 5-year warranty vs LiFePO4, 5-year warranty).
- Choose the EcoFlow DELTA 3 Max Plus for AC output (3,000 W continuous AC vs 2,500 W continuous AC).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | OUPES Mega 2 Pro | EcoFlow DELTA 3 Max Plus |
|---|---|---|
| Overall rating | 4.1/5 | 3.7/5 |
| Value 25% | 94 $0.34 per rated Wh | 56 $0.59 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 46 80% of rated capacity delivered (1 test) |
| Battery life 15% | 100 LiFePO4, 4,000 cycles, 5-year warranty | 70 LiFePO4, 5-year warranty |
| AC output 15% | 58 2,500 W continuous AC | 79 3,000 W continuous AC |
| Charging speed 10% | 50 full AC charge time not published (neutral score used) | 50 full AC charge time not published (neutral score used) |
| Portability 10% | 87 93 Wh per kg (48.8 lb (22.1 kg)) | 87 93 Wh per kg (48.7 lb (22.1 kg)) |
| Solar input 5% | 40 1,000 W max solar input | 40 1,000 W max solar input |
| Features 5% | 100 UPS (20 ms), expandable, 140 W USB-C, app | 100 UPS (10 ms), expandable, 140 W USB-C, app |
Independent capacity tests
OUPES Mega 2 Pro
No independent test published yet.
EcoFlow DELTA 3 Max Plus
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| StorageReview | 1,640 Wh | 80% | Full 100%-to-0% AC discharge; load not specified. Recharge took 2.33 kWh from the wall. Measured UPS switchover: 8 ms. |
Specifications
| OUPES Mega 2 Pro | EcoFlow DELTA 3 Max Plus | |
|---|---|---|
| Battery | ||
| Rated capacity | 2,048 Wh | 2,048 Wh |
| Tested usable capacity | - | 1,640 Wh (80%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 4000+ cycles to 80% | - |
| Expandable | Yes, up to 10,240 Wh | Yes, up to 10,000 Wh |
| Output | ||
| AC output | 2,500 W | 3,000 W (6,000 W surge) |
| Boost mode (resistive loads) | 3,600 W | 3,800 W |
| AC outlets | 5 total | 4 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | - |
| AC waveform | - | Pure sine wave |
| USB-C ports | 2 (up to 140 W each) | 3 (up to 140 W each) |
| USB-A ports | 2 | 1 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | 0 | 0 |
| UPS / pass-through | Yes (20 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Max solar input | 1,000 W | 1,000 W |
| Solar input voltage | 12-80V (MPPT 18-80V, 30A) | 11-60V, 18A max (2 XT60i inputs) |
| Car charging | 96 W | 96 W |
| Build | ||
| Weight | 48.8 lb (22.1 kg) | 48.7 lb (22.1 kg) |
| Dimensions | 18.8 x 11.6 x 11.6 in | 19.4 x 9.5 x 12.0 in |
| App | OUPES app (Wi-Fi/Bluetooth) | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | 5 years | 5 years |
| Released | 2026-06 | 2025-09 |