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 battery life, value and solar input. The EcoFlow DELTA 3 Max wins on portability. The OUPES Mega 2 Pro costs $200 less ($699 vs $899).
EcoFlow DELTA 3 Max
#26 in LargeFull review
For buyers who want 2 kWh of fast-charging backup at a mid-range price and do not need heavy solar input.
Amazon $899$899
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 battery life (LiFePO4, 4,000 cycles, 5-year warranty vs LiFePO4, 5-year warranty), value ($0.34 per rated Wh vs $0.44 per rated Wh) and solar input (1,000 W max solar input vs 500 W max solar input).
- Choose the EcoFlow DELTA 3 Max for portability (101 Wh per kg (44.8 lb (20.3 kg)) vs 93 Wh per kg (48.8 lb (22.1 kg))).
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 |
|---|---|---|
| Overall rating | 4.1/5 | 3.7/5 |
| Value 25% | 94 $0.34 per rated Wh | 79 $0.44 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 41 79% 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 | 54 2,400 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)) | 100 101 Wh per kg (44.8 lb (20.3 kg)) |
| Solar input 5% | 40 1,000 W max solar input | 11 500 W max solar input |
| Features 5% | 100 UPS (20 ms), expandable, 140 W USB-C, app | 75 UPS (10 ms), 100 W USB-C, app |
Independent capacity tests
OUPES Mega 2 Pro
No independent test published yet.
EcoFlow DELTA 3 Max
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| The Solar Lab | - | 79% | Efficiency test (load not stated in the review). Measured AC recharge 0-100% in 68 min; idle draw 27W. |
Specifications
| OUPES Mega 2 Pro | EcoFlow DELTA 3 Max | |
|---|---|---|
| Battery | ||
| Rated capacity | 2,048 Wh | 2,048 Wh |
| Tested usable capacity | - | 1,618 Wh (79%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 4000+ cycles to 80% | - |
| Expandable | Yes, up to 10,240 Wh | - |
| Output | ||
| AC output | 2,500 W | 2,400 W (4,800 W surge) |
| Boost mode (resistive loads) | 3,600 W | 3,400 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 100 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 | 500 W |
| Solar input voltage | 12-80V (MPPT 18-80V, 30A) | - |
| Car charging | 96 W | 96 W |
| Build | ||
| Weight | 48.8 lb (22.1 kg) | 44.8 lb (20.3 kg) |
| Dimensions | 18.8 x 11.6 x 11.6 in | 494 x 239 x 305 mm |
| App | OUPES app (Wi-Fi/Bluetooth) | Wi-Fi + Bluetooth |
| Warranty | 5 years | 5 years |
| Released | 2026-06 | 2025-09 |