EcoFlow RIVER 3 Plus
#8 in SmallFull review
A compact LiFePO4 station for camping, laptop work and router/modem UPS duty, with the option to add capacity later.
Amazon $299$299
The EcoFlow RIVER 3 Plus is the better portable power station overall, rated 3.7 to 3.4. The EcoFlow RIVER 3 Plus leads on battery life, charging speed and AC output. The EnginStar R300 wins on value and portability. The EnginStar R300 costs $149.01 less ($149.99 vs $299).
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 EcoFlow RIVER 3 Plus for battery life (LiFePO4, 3,000 cycles, 5-year warranty vs Lithium-ion, 1,000 cycles, 1-year warranty), charging speed (0-100% on AC in 1 h vs 0-100% on AC in 7 h) and AC output (600 W continuous AC vs 300 W continuous AC).
- Choose the EnginStar R300 for value ($0.51 per rated Wh vs $1.05 per rated Wh) and portability (100 Wh per kg (6.5 lb (3 kg)) vs 61 Wh per kg (10.4 lb (4.7 kg))).
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 | EcoFlow RIVER 3 Plus | EnginStar R300 |
|---|---|---|
| Overall rating | 3.7/5 | 3.4/5 |
| Value 25% | 48 $1.05 per rated Wh | 95 $0.51 per rated Wh |
| Tested capacity 15% | 28 76% of rated capacity delivered (1 test) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 91 LiFePO4, 3,000 cycles, 5-year warranty | 19 Lithium-ion, 1,000 cycles, 1-year warranty |
| AC output 15% | 83 600 W continuous AC | 41 300 W continuous AC |
| Charging speed 10% | 95 0-100% on AC in 1 h | 0 0-100% on AC in 7 h |
| Portability 10% | 28 61 Wh per kg (10.4 lb (4.7 kg)) | 100 100 Wh per kg (6.5 lb (3 kg)) |
| Solar input 5% | 73 220 W max solar input | 50 solar input not published (neutral score used) |
| Features 5% | 100 UPS (10 ms), expandable, 100 W USB-C, app | 0 no UPS, expansion or app |
Independent capacity tests
EcoFlow RIVER 3 Plus
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| CNET | 218 Wh | 76.2% | 480W load logged with HOBOware; round-trip efficiency 72.41%; recharge from empty 1 h 12 min. |
EnginStar R300
No independent test published yet.
Specifications
| EcoFlow RIVER 3 Plus | EnginStar R300 | |
|---|---|---|
| Battery | ||
| Rated capacity | 286 Wh | 296 Wh |
| Tested usable capacity | 218 Wh (76%) | - |
| Chemistry | LiFePO4 | Lithium-ion |
| Cycle life | 3,000 to 80% | 1,000 >1000 cycles per the manual; end-of-life capacity not stated |
| Expandable | Yes, up to 858 Wh | - |
| Output | ||
| AC output | 600 W (1,200 W surge) | 300 W |
| Boost mode (resistive loads) | 1,200 W | - |
| AC outlets | 3 total | 2 total |
| 120V 15A outlets (NEMA 5-15R) | 3 | 2 |
| AC waveform | Pure sine wave | Pure sine wave |
| USB-C ports | 1 (100 W) | 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 | 380 W | 65 W |
| Full AC charge time | 1 h | 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 | 220 W | - |
| Solar input voltage | - | 12-25V |
| Car charging | 220 W | - |
| Build | ||
| Weight | 10.4 lb (4.7 kg) | 6.5 lb (3 kg) |
| Dimensions | 9.2 x 9.1 x 5.8 in | 9.06 x 7.64 x 5.51 in |
| App | Wi-Fi + Bluetooth | - |
| Warranty | 5 years | 1 years |
| Released | 2025-03 | 2024-05 |