Victron Phoenix 12/500
#3 in Up to 1,000 WFull review
A good size for CPAP, electronics and a 12 V-friendly fridge in a camper. Low idle draw means it can be left on.
Amazon $133.96$133.96
The Victron Phoenix 12/500 is the better 12V inverter overall, rated 3.7 to 3.1. The Victron Phoenix 12/500 leads on warranty, idle draw and features. The Samlex NTX-400-12 wins on efficiency.
Samlex NTX-400-12
#17 in Up to 1,000 WFull review
For a van or truck cab that needs listed power for electronics and a USB charger.
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 Victron Phoenix 12/500 for warranty (5-year warranty vs 2-year warranty), idle draw (0.6 A idle (about 7 W) with nothing plugged in vs 0.8 A idle (about 9.6 W) with nothing plugged in) and features (optional remote, app add-on; no hardwire terminal vs outlets only).
- Choose the Samlex NTX-400-12 for efficiency (91% peak efficiency (maker rating) vs 86% peak efficiency (maker rating)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 1,000 W 12V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Victron Phoenix 12/500 | Samlex NTX-400-12 |
|---|---|---|
| Overall rating | 3.7/5 | 3.1/5 |
| Value 30% | 64 $0.29 per continuous watt | 50 no current price (neutral score used) |
| Idle draw 15% | 56 0.6 A idle (about 7 W) with nothing plugged in | 27 0.8 A idle (about 9.6 W) with nothing plugged in |
| Safety listing 15% | 100 LabTest certified to UL 458 (certificate LC20760-1) | 100 Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 |
| Warranty 15% | 100 5-year warranty | 25 2-year warranty |
| Features 15% | 25 optional remote, app add-on; no hardwire terminal | 0 outlets only |
| Efficiency 10% | 11 86% peak efficiency (maker rating) | 67 91% peak efficiency (maker rating) |
Specifications
| Victron Phoenix 12/500 | Samlex NTX-400-12 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter | Pure sine wave inverter |
| Continuous power | 460 W | 400 W |
| Surge power | 750 W for 3 s | 800 W for 1 s |
| DC input range | 9.2 to 17 V | 10.5 to 16.3 V |
| Idle draw | 0.6 A (7 W) | 0.8 A (9.6 W) |
| Power-saving draw | 0.1 A | - |
| Peak efficiency | 86% | 91% |
| Connections | ||
| AC outlets | 2 | 2 |
| GFCI outlets | Yes | No |
| Hardwire terminal | No | No |
| USB ports | None | 1 |
| Transfer switch | No | No |
| Parallel units | No | No |
| Control and build | ||
| Remote | Optional extra | No |
| App | Optional add-on | No |
| Display | No | No |
| Safety listing | LabTest certified to UL 458 (certificate LC20760-1) | Intertek ETL listed; conforms to UL 458 and certified to CSA C22.2 No. 107.1 |
| Cooling | fan | load-controlled fan |
| Dimensions | 86 x 172 x 275 mm (3.4 x 6.8 x 10.8 in) | 155 x 225 x 59 mm (6.10 x 8.86 x 2.32 in) |
| Weight | 7.7 lb | 2 lb |
| Warranty | 5 years | 2 years |