OUPES Mega 1
#13 in Mid-sizeFull review
A strong 1kWh home-backup station with a big inverter and room to expand, often sold well below list price on Amazon.
Amazon $549$549
The OUPES Mega 1 and the EcoFlow DELTA 3 Plus are evenly matched, rated 4.2 and 4.2. The OUPES Mega 1 leads on value. The EcoFlow DELTA 3 Plus wins on tested capacity and solar input. The OUPES Mega 1 costs $170 less ($549 vs $719).
EcoFlow DELTA 3 Plus
#14 in Mid-sizeFull review
A fast-charging 1kWh LiFePO4 station for home backup and camping, worth the premium over the DELTA 3 mainly for its 1000W dual solar input and 140W USB-C.
Amazon EcoFlow $719$719
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 1 for value ($0.54 per rated Wh vs $0.70 per rated Wh).
- Choose the EcoFlow DELTA 3 Plus for tested capacity (85% of rated capacity delivered (2 tests) vs 79% of rated capacity delivered (1 test)) and solar input (1,000 W max solar input vs 800 W max solar input).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every mid-size portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | OUPES Mega 1 | EcoFlow DELTA 3 Plus |
|---|---|---|
| Overall rating | 4.2/5 | 4.2/5 |
| Value 25% | 75 $0.54 per rated Wh | 53 $0.70 per rated Wh |
| Tested capacity 15% | 41 79% of rated capacity delivered (1 test) | 70 85% of rated capacity delivered (2 tests) |
| Battery life 15% | 96 LiFePO4, 3,500 cycles, 5-year warranty | 100 LiFePO4, 4,000 cycles, 5-year warranty |
| AC output 15% | 88 2,000 W continuous AC | 82 1,800 W continuous AC |
| Charging speed 10% | 96 0-100% on AC in 58 min | 97 0-100% on AC in 56 min |
| Portability 10% | 66 81 Wh per kg (27.8 lb (12.6 kg)) | 67 82 Wh per kg (27.6 lb (12.5 kg)) |
| Solar input 5% | 74 800 W max solar input | 97 1,000 W max solar input |
| Features 5% | 100 UPS (20 ms), expandable, 100 W USB-C, app | 100 UPS (10 ms), expandable, 140 W USB-C, app |
Independent capacity tests
OUPES Mega 1
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| The Solar Lab | - | 79% | 1,779W appliance load ran for 27 minutes. |
EcoFlow DELTA 3 Plus
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| StorageReview | 910 Wh | 89% | Full 100%-to-0% discharge; load not specified. Recharge took 1.18 kWh from the wall. |
| The Solar Lab | - | 82% | 1,573W appliance load run for 32 minutes; reviewer reported fan/overheating inconsistency under this load. |
Specifications
| OUPES Mega 1 | EcoFlow DELTA 3 Plus | |
|---|---|---|
| Battery | ||
| Rated capacity | 1,024 Wh | 1,024 Wh |
| Tested usable capacity | 809 Wh (79%) | 875 Wh (85%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 3,500 to 80% | 4,000 to 80% |
| Expandable | Yes, up to 5,120 Wh | Yes, up to 5,000 Wh |
| Output | ||
| AC output | 2,000 W (4,500 W surge) | 1,800 W (3,600 W surge) |
| Boost mode (resistive loads) | - | 2,200 W |
| AC outlets | 4 total | 6 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 3 |
| 120V 2-prong outlets (NEMA 1-15R) | - | 3 |
| AC waveform | - | Pure sine wave |
| USB-C ports | 2 (up to 100 W each) | 2 (up to 140 W each) |
| USB-A ports | 4 | 2 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | 2 | 2 |
| UPS / pass-through | Yes (20 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,400 W | 1,500 W |
| Full AC charge time | 58 min (OUPES: full in 36 min with AC plus solar (2200W). The Amazon listing says 36 min to 80%. AC-only time not published) | 56 min |
| Max solar input | 800 W | 1,000 W |
| Solar input voltage | 12-78V (MPPT 18-75V, 14A) | 11-60V (2 inputs, 500W each) |
| Car charging | 96 W | 800 W |
| Build | ||
| Weight | 27.8 lb (12.6 kg) | 27.6 lb (12.5 kg) |
| Dimensions | 15.1 x 9.1 x 11.6 in | 16 x 8.0 x 11 in |
| App | OUPES app (Wi-Fi/Bluetooth) | EcoFlow app |
| Warranty | 5 years | 5 years |
| Released | 2025-07 | 2024-09 |