For campers and travelers who mainly charge laptops, phones and cameras and want a few AC outlets in a small, light unit.
Amazon $329.99
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.
- 296 WhCapacity
- 300 WAC output
- 6.5 lbWeight
- Lithium-ionBattery
- 7 hFull charge
- $0.51Price / Wh
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
- Low price for a pure sine wave station with nearly 300Wh
- Light enough to carry one-handed at 6.5 lb
- Regulated 12V and 24V DC outputs plus a car socket for fridges, fans and lights
- Lithium-ion cells rated for about 1,000 cycles, so heavy daily use wears it out much sooner than LiFePO4 rivals
- Slow to refill: about 7 hours from the wall through a 65W laptop-style brick
- USB-C tops out at 18W, too little to charge most laptops at full speed
- Only a 12-month warranty and no independent capacity tests
How it scores
The rating comes from 8 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | R300 |
|---|---|
| Battery | |
| Rated capacity | 296 Wh |
| Chemistry | Lithium-ion |
| Cycle life | 1,000 >1000 cycles per the manual; end-of-life capacity not stated |
| Output | |
| AC output | 300 W |
| AC outlets | 2 total |
| 120V 15A outlets (NEMA 5-15R) | 2 |
| AC waveform | Pure sine wave |
| USB-C ports | 1 (18 W) |
| USB-A ports | 2 |
| 12 V car outlet | Yes |
| DC5521 ports | 2 |
| Charging | |
| AC charging | 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.) |
| Solar input voltage | 12-25V |
| Build | |
| Weight | 6.5 lb (3 kg) |
| Dimensions | 9.06 x 7.64 x 5.51 in |
| Warranty | 1 years |
Alternatives in this size
A DC-only battery for charging phones, laptops and USB lights on day trips. Choose it over a large power bank when you want LiFePO4 longevity and 140W USB-C.
Amazon EcoFlow $119A large USB-C battery for photographers, travelers and campers who only need to charge laptops, phones and cameras. Skip it if anything you own needs a wall plug.
Amazon $139.99Compare
Compare the EnginStar R300 with any other portable power station →
More from EnginStar: every EnginStar product ranked.