Samlex NTX-1500-12
#13 in 1,100 to 2,000 WFull review
For RVs and vans that want a listed inverter for a microwave or coffee maker at a fair price.
Amazon $422.50$422.50
The Samlex NTX-1500-12 is the better 12V inverter overall, rated 3.4 to 2.3. The Samlex NTX-1500-12 leads on safety listing, idle draw and value. The Samlex NTX-1500-12 costs $112.50 less ($422.50 vs $535).
Go Power! GP-ISW1500
#35 in 1,100 to 2,000 WFull review
For RVs that run a microwave or coffee maker. Same hardware as the Cotek SP-1500-112.
Amazon $535$535
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 Samlex NTX-1500-12 for safety listing (Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 vs no UL 458 or UL 1741 listing stated), idle draw (0.8 A idle (about 9.6 W) with nothing plugged in vs 1.8 A idle (about 21.6 W) with nothing plugged in) and value ($0.28 per continuous watt vs $0.36 per continuous watt).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 1,100 to 2,000 W 12V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Samlex NTX-1500-12 | Go Power! GP-ISW1500 |
|---|---|---|
| Overall rating | 3.4/5 | 2.3/5 |
| Value 30% | 47 $0.28 per continuous watt | 26 $0.36 per continuous watt |
| Idle draw 15% | 80 0.8 A idle (about 9.6 W) with nothing plugged in | 13 1.8 A idle (about 21.6 W) with nothing plugged in |
| Safety listing 15% | 100 Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 25 2-year warranty | 25 2-year warranty |
| Features 15% | 25 remote included; no app | 12 optional remote; no app |
| Efficiency 10% | 61 90.5% peak efficiency (maker rating) | 67 91% peak efficiency (maker rating) |
Specifications
| Samlex NTX-1500-12 | Go Power! GP-ISW1500 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter | Pure sine wave inverter |
| Continuous power | 1,500 W | 1,500 W |
| Surge power | 3,000 W for 1 s | 2,650 W |
| DC input range | 10.5 to 16.3 V | 10.5 to 16.5 V |
| Idle draw | 0.8 A (9.6 W) | 1.8 A (21.6 W) |
| Power-saving draw | - | 0.1 A |
| Peak efficiency | 90.5% | 91% |
| Connections | ||
| AC outlets | 2 | 2 |
| GFCI outlets | Yes | Yes |
| Hardwire terminal | No | No |
| USB ports | None | None |
| Transfer switch | No | No |
| Parallel units | No | No |
| Control and build | ||
| Remote | Included | Optional extra |
| App | No | No |
| Display | No | No |
| Safety listing | Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 | No |
| Cooling | load-controlled fan | load-controlled fan |
| Dimensions | 216 x 333 x 92 mm | 421 x 248 x 83 mm (16.59 x 9.76 x 3.27 in) |
| Weight | 7.8 lb | 9.1 lb |
| Warranty | 2 years | 2 years |