Samlex PST-300-12
#23 in Up to 1,000 WFull review
For a van or boat that needs listed, GFCI-protected power for laptops, TVs and chargers.
Amazon $251.80$251.80
2.5/5
For vans and small RVs that run a small microwave or coffee maker and want low idle draw.
- 1,000 WContinuous
- 1,750 WSurge
- 1.5 AIdle draw
- NoUL listed
- 2 yearsWarranty
Check price at Amazon$367.90
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Runs a small microwave or coffee maker
- Under 0.1 A in powersave mode
- GFCI outlets built in
- Low-profile case fits under a bed or seat
Cons
- No UL 458 listing by a named lab
- Two-year warranty
The Go Power! GP-ISW family
Every Go Power! GP-ISW model we rank, smallest first. Ratings compare each against its own size.
| Model | Continuous | Rating | Price |
|---|---|---|---|
| Go Power! GP-ISW700 | 700 W | 2.1/5 | $355.99 |
| Go Power! GP-ISW1000 (this one) | 1,000 W | 2.5/5 | $367.90 |
| Go Power! GP-ISW1500 | 1,500 W | 2.3/5 | $535 |
| Go Power! GP-ISW2000 | 2,000 W | 2.2/5 | $759.99 |
| Go Power! GP-ISW3000 | 3,000 W | 2.0/5 | $1,128.95 |
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 | GP-ISW1000-12 |
|---|---|
| Output | |
| Type | Pure sine wave inverter |
| Continuous power | 1,000 W |
| Surge power | 1,750 W |
| DC input range | 10.5 to 16.5 V |
| Idle draw | 1.5 A (18 W) |
| Power-saving draw | 0.1 A |
| Peak efficiency | 92% |
| Connections | |
| AC outlets | 2 |
| GFCI outlets | Yes |
| Hardwire terminal | No |
| USB ports | None |
| Transfer switch | No |
| Parallel units | No |
| Control and build | |
| Remote | Optional extra |
| App | No |
| Display | No |
| Safety listing | No |
| Cooling | load-controlled fan |
| Dimensions | 372 x 200 x 83 mm (14.65 x 7.87 x 3.27 in) |
| Weight | 7.2 lb |
| Warranty | 2 years |
Alternatives in this size
Samlex PST-1000-12HD
#24 in Up to 1,000 WFull review
For RV and boat builders who need a listed 1,000 W inverter that can be hardwired. Shoppers on a budget get more from the NTX-1000-12.
Amazon $637.55$637.55
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
Compare
Compare the Go Power! GP-ISW1000 with any other 12V inverter →
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