Go Power! GP-ISW1000
#25 in Up to 1,000 WFull review
For vans and small RVs that run a small microwave or coffee maker and want low idle draw.
Amazon $367.90$367.90
2.2/5
For powering one laptop or CPAP from a vehicle 12 V socket. Pricey per watt, but clean and tiny.
- 120 WContinuous
- 120 WSurge
- 0.5 AIdle draw
- NoUL listed
- 3 yearsWarranty
Check price at Amazon$206.29
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Plugs into a 12 V dash socket, no wiring needed
- Small enough to tuck into a glovebox or bag
- Clean power for a laptop, CPAP or camera charger
Cons
- Two-prong outlet only, so grounded plugs need an adapter
- Costs about as much as a 600 W inverter
- No surge headroom for anything with a motor
The Samlex PST family
Every Samlex PST model we rank, smallest first. Ratings compare each against its own size.
| Model | Continuous | Rating | Price |
|---|---|---|---|
| Samlex PST-120-12 (this one) | 120 W | 2.2/5 | $206.29 |
| Samlex PST-150-12 | 150 W | 2.7/5 | - |
| Samlex PST-300-12 | 300 W | 2.7/5 | $251.80 |
| Samlex PST-600-12 | 600 W | 2.8/5 | $315.83 |
| Samlex PST-1000F-12 | 1,000 W | 3.0/5 | - |
| Samlex PST-1000-12HD | 1,000 W | 2.6/5 | $637.55 |
| Samlex PST-1500-12 | 1,500 W | 2.9/5 | $616.04 |
| Samlex PST-2000-12 | 2,000 W | 2.8/5 | $1,096.99 |
| Samlex PST-3000-12 | 3,000 W | 3.3/5 | - |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | PST-120-12 |
|---|---|
| Output | |
| Type | Pure sine wave inverter |
| Continuous power | 120 W |
| Surge power | 120 W |
| DC input range | 10 to 16.5 V |
| Idle draw | 0.5 A (6 W) |
| Peak efficiency | 88% |
| Connections | |
| AC outlets | 1 |
| GFCI outlets | No |
| Hardwire terminal | No |
| USB ports | 1 |
| Transfer switch | No |
| Parallel units | No |
| Control and build | |
| Remote | No |
| App | No |
| Display | No |
| Safety listing | No |
| Cooling | fan |
| Dimensions | 105 x 189 x 30.5 mm (4.13 x 7.44 x 1.2 in) |
| Weight | 1 lb |
| Warranty | 3 years |
Alternatives in this size
Cotek SP-1000-112
#26 in Up to 1,000 WFull review
For vans and small RVs that run a small microwave and want very low standby draw.
Northern Arizona Wind & Sun $406$406
Cotek SP-700-112
#28 in Up to 1,000 WFull review
For campers who want a small, efficient inverter for electronics and a fridge.
Amazon $354$354
Compare
Compare the Samlex PST-120-12 with any other 12V inverter →
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