OUPES Mega 3
#5 in Home backupFull review
A big home-backup station with a 3600W inverter, RV outlet and massive solar input, for households that want to run large appliances through outages.
OUPES $1,199$1,199
The OUPES Mega 3 rates 4.0 among home backup portable power stations; the BLUETTI Apex 300 rates 4.0 among large ones. The OUPES Mega 3 costs $299.98 less ($1,199 vs $1,498.98).
BLUETTI Apex 300
#15 in LargeFull review
For homeowners who want a 240V-capable backup battery that grows with expansion packs, not a grab-and-go unit.
Amazon $1,498.98 BLUETTI $1,499$1,498.98
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.
Scores side by side
These two sit in different size classes (home backup and large), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | OUPES Mega 3 | BLUETTI Apex 300 |
|---|---|---|
| Overall rating | 4.0/5 | 4.0/5 |
| Value 25% | 86 $0.39 per rated Wh | 63 $0.54 per rated Wh |
| Tested capacity 15% | 73 86% of rated capacity delivered (1 test) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 96 LiFePO4, 3,500 cycles, 5-year warranty | 100 LiFePO4, 6,000 cycles, 5-year warranty |
| AC output 15% | 37 3,600 W continuous AC | 100 3,840 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% | 66 81 Wh per kg (83.3 lb (37.8 kg)) | 50 73 Wh per kg (83.8 lb (38 kg)) |
| Solar input 5% | 63 2,100 W max solar input | 84 2,400 W max solar input |
| Features 5% | 100 UPS (20 ms), expandable, 100 W USB-C, app | 80 UPS (0 ms), expandable, app |
Independent capacity tests
OUPES Mega 3
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| The Solar Lab | - | 86% | 2,968W appliance load ran for 53.5 minutes. The article states 3,720Wh capacity in one place; the runtime math matches the rated 3,072Wh. |
BLUETTI Apex 300
No independent test published yet.
Specifications
| OUPES Mega 3 | BLUETTI Apex 300 | |
|---|---|---|
| Battery | ||
| Rated capacity | 3,072 Wh | 2,764.8 Wh |
| Tested usable capacity | 2,642 Wh (86%) | - |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 3,500 to 80% | 6,000 to 80% |
| Expandable | Yes, up to 15,360 Wh | Yes, up to 19,353.6 Wh |
| Output | ||
| AC output | 3,600 W (7,000 W surge) | 3,840 W (7,680 W surge) |
| AC outlets | 6 total | 6 total |
| 120V 20A outlets (NEMA 5-20R) | 5 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| 120/240V 50A outlet (NEMA 14-50R) | - | 1 |
| USB-C ports | 2 (up to 100 W each) | 0 |
| USB-A ports | 4 | 0 |
| 12 V car outlet | Yes | No |
| DC5521 ports | 2 | 0 |
| UPS / pass-through | Yes (20 ms switchover) | Yes (0 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Max solar input | 2,100 W | 2,400 W |
| Solar input voltage | 12-148V (MPPT 18-140V, 15A) | 2 inputs, 12-60V, 20A each |
| Build | ||
| Weight | 83.3 lb (37.8 kg) | 83.8 lb (38 kg) |
| Dimensions | 25.2 x 11.9 x 17.2 in | 20.67 x 12.87 x 12.6 in |
| App | OUPES app (Wi-Fi/Bluetooth) | Wi-Fi + Bluetooth |
| Warranty | 5 years | 5 years |