OUPES Exodus 350
#4 in SmallFull review
A light, well-warrantied LiFePO4 station for laptops, CPAP, phones and keeping Wi-Fi up during outages.
Amazon $199.99$199.99
The OUPES Exodus 350 is the better portable power station overall, rated 3.8 to 3.4. The OUPES Exodus 350 leads on battery life, features and AC output. The EnginStar R300 wins on portability and value. The EnginStar R300 costs $50 less ($149.99 vs $199.99).
EnginStar R300
#22 in SmallFull review
A cheap, light 296Wh station for phones, cameras, CPAP and small camping loads. Buyers who will cycle it often should pay a little more for a LiFePO4 model with a longer warranty.
Amazon $149.99$149.99
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 Exodus 350 for battery life (LiFePO4, 4,000 cycles, 5-year warranty vs Lithium-ion, 1,000 cycles, 1-year warranty), features (UPS (10 ms), 140 W USB-C, app vs no UPS, expansion or app) and AC output (350 W continuous AC vs 300 W continuous AC).
- Choose the EnginStar R300 for portability (100 Wh per kg (6.5 lb (3 kg)) vs 69 Wh per kg (9.2 lb (4.2 kg))) and value ($0.51 per rated Wh vs $0.69 per rated Wh).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every small portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | OUPES Exodus 350 | EnginStar R300 |
|---|---|---|
| Overall rating | 3.8/5 | 3.4/5 |
| Value 25% | 79 $0.69 per rated Wh | 95 $0.51 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 100 LiFePO4, 4,000 cycles, 5-year warranty | 19 Lithium-ion, 1,000 cycles, 1-year warranty |
| AC output 15% | 51 350 W continuous AC | 41 300 W continuous AC |
| Charging speed 10% | 50 full AC charge time not published (neutral score used) | 0 0-100% on AC in 7 h |
| Portability 10% | 44 69 Wh per kg (9.2 lb (4.2 kg)) | 100 100 Wh per kg (6.5 lb (3 kg)) |
| Solar input 5% | 80 240 W max solar input | 50 solar input not published (neutral score used) |
| Features 5% | 75 UPS (10 ms), 140 W USB-C, app | 0 no UPS, expansion or app |
Specifications
| OUPES Exodus 350 | EnginStar R300 | |
|---|---|---|
| Battery | ||
| Rated capacity | 288 Wh | 296 Wh |
| Chemistry | LiFePO4 | Lithium-ion |
| Cycle life | 4,000 4000+ cycles to 80% | 1,000 >1000 cycles per the manual; end-of-life capacity not stated |
| Expandable | No | - |
| Output | ||
| AC output | 350 W (600 W surge) | 300 W |
| AC outlets | 2 total | 2 total |
| 120V 15A outlets (NEMA 5-15R) | - | 2 |
| 120V 20A outlets (NEMA 5-20R) | 1 | - |
| 120V 2-prong outlets (NEMA 1-15R) | 1 | - |
| AC waveform | - | Pure sine wave |
| USB-C ports | 2 (up to 140 W each) | 1 (18 W) |
| USB-A ports | 2 | 2 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | 0 | 2 |
| UPS / pass-through | Yes (10 ms switchover) | - |
| Charging | ||
| AC charging | 200 W | 65 W |
| Full AC charge time | - | 7 h (About 7 hours per the manual and the B09SHB84J2 listing; a listing image says 5-7 hr. Another EnginStar listing (B0FJD7LCY4) claims 80% in 2 hours, which doesn't fit a 65W input and isn't used here.) |
| Max solar input | 240 W | - |
| Solar input voltage | 12-35V | 12-25V |
| Car charging | 96 W | - |
| Build | ||
| Weight | 9.2 lb (4.2 kg) | 6.5 lb (3 kg) |
| Dimensions | 9.5 x 8.8 x 5.9 in | 9.06 x 7.64 x 5.51 in |
| App | OUPES app (Wi-Fi/Bluetooth) | - |
| Warranty | 5 years | 1 years |
| Released | 2026-08 | 2024-05 |