Victron MultiPlus-II 12/4k 120V
For big 12 V lithium builds that want to run an air conditioner without moving to 24 or 48 V. Check that your inspector accepts it before buying, since no UL certificate is published.
DRSA $1,105$1,105
The Victron MultiPlus-II 12/4k 120V rates 4.0 among inverter-chargers 12V inverters; the Victron Phoenix 12/3000 120V rates 3.0 among over 2,000 W ones. The Victron Phoenix 12/3000 120V costs $242.21 less ($862.79 vs $1,105).
Victron Phoenix 12/3000 120V
#21 in Over 2,000 WFull review
A heavy-duty 3,000 VA inverter for a large van, boat or cabin that has separate charging and shore-power switching. Most buyers are better served by a MultiPlus 12/3000, which adds the charger and transfer switch.
Amazon $862.79$862.79
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
These two sit in different size classes (inverter-chargers and over 2,000 W), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Victron MultiPlus-II 12/4k 120V | Victron Phoenix 12/3000 120V |
|---|---|---|
| Overall rating | 4.0/5 | 3.0/5 |
| Value 30% | 90 $0.33 per continuous watt | 13 $0.36 per continuous watt |
| Idle draw 15% | 73 1.5 A idle (about 18 W) with nothing plugged in | 59 1.7 A idle (about 20 W) with nothing plugged in |
| Safety listing 15% | 0 no UL 458 or UL 1741 listing stated | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 100 5-year warranty | 100 5-year warranty |
| Features 15% | 65 optional remote, app add-on, lithium charge profile, hardwire terminal | 40 optional remote, app add-on, hardwire terminal |
| Efficiency 10% | 89 93% peak efficiency (maker rating) | 89 93% peak efficiency (maker rating) |
Specifications
| Victron MultiPlus-II 12/4k 120V | Victron Phoenix 12/3000 120V | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter |
| Continuous power | 3,400 W | 2,400 W |
| Surge power | 6,000 W for 2 s | 6,000 W |
| DC input range | 9.5 to 17 V | 9.5 to 17 V |
| Idle draw | 1.5 A (18 W) | 1.7 A (20 W) |
| Power-saving draw | 0.3 A | 0.7 A |
| Peak efficiency | 93% | 93% |
| Connections | ||
| AC outlets | 0 | 0 |
| GFCI outlets | No | No |
| Hardwire terminal | Yes | Yes |
| USB ports | None | None |
| Transfer switch | Yes | No |
| Charger | 160 A | - |
| Lithium charge profile | Yes | - |
| Parallel units | Yes | Yes |
| Control and build | ||
| Remote | Optional extra | Optional extra |
| App | Optional add-on | Optional add-on |
| Display | No | No |
| Safety listing | No | No |
| Cooling | fan | fan |
| Dimensions | 631 x 277 x 164 mm (24.8 x 10.9 x 6.5 in) | 362 x 258 x 218 mm (14.3 x 10.2 x 8.6 in) |
| Weight | 49 lb | 38 lb |
| Warranty | 5 years | 5 years |