Samlex NTX-3000S-12
#7 in Over 2,000 WFull review
For cabins and work trucks that want a listed 3,000 W inverter with plain household outlets.
Amazon $732.40$732.40
The Samlex NTX-3000S-12 and the Samlex NTX-3000-12 are evenly matched, rated 3.5 and 3.4. The Samlex NTX-3000S-12 costs $9.57 less ($732.40 vs $741.97).
Samlex NTX-3000-12
#8 in Over 2,000 WFull review
For RVs that want to feed the whole coach panel through a 30 A cord from a listed inverter.
Amazon $741.97$741.97
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.
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every over 2,000 W 12V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Samlex NTX-3000S-12 | Samlex NTX-3000-12 |
|---|---|---|
| Overall rating | 3.5/5 | 3.4/5 |
| Value 30% | 49 $0.24 per continuous watt | 48 $0.25 per continuous watt |
| Idle draw 15% | 84 1.1 A idle (about 13.2 W) with nothing plugged in | 84 1.1 A idle (about 13.2 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 | 100 Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 |
| Warranty 15% | 25 2-year warranty | 25 2-year warranty |
| Features 15% | 25 remote included; no app | 25 remote included; no app |
| Efficiency 10% | 61 90.5% peak efficiency (maker rating) | 61 90.5% peak efficiency (maker rating) |
Specifications
| Samlex NTX-3000S-12 | Samlex NTX-3000-12 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter | Pure sine wave inverter |
| Continuous power | 3,000 W | 3,000 W |
| Surge power | 6,000 W for 1 s | 6,000 W for 1 s |
| DC input range | 10.5 to 16.3 V | 10.5 to 16.3 V |
| Idle draw | 1.1 A (13.2 W) | 1.1 A (13.2 W) |
| Peak efficiency | 90.5% | 90.5% |
| Connections | ||
| AC outlets | 3 | 1 |
| GFCI outlets | No | Yes |
| Hardwire terminal | No | No |
| USB ports | None | None |
| Transfer switch | No | No |
| Parallel units | No | No |
| Control and build | ||
| Remote | Included | Included |
| App | No | No |
| Display | No | No |
| Safety listing | Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 | Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 |
| Cooling | load-controlled fan | load-controlled fan |
| Dimensions | 216 x 451 x 92 mm (8.50 x 17.75 x 3.62 in) | 216 x 451 x 92 mm |
| Weight | 12 lb | 12 lb |
| Warranty | 2 years | 2 years |