Magnum Energy MS2812
#22 in Inverter-chargersFull review
For full-time RVers who want a rugged low-frequency inverter-charger that will start air conditioners and charge fast from a generator.
The Magnum Energy MS2812 rates 3.5 among inverter-chargers 12V inverters; the Victron Phoenix 12/3000 120V rates 3.0 among over 2,000 W ones.
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 | Magnum Energy MS2812 | Victron Phoenix 12/3000 120V |
|---|---|---|
| Overall rating | 3.5/5 | 3.0/5 |
| Value 30% | 50 no current price (neutral score used) | 13 $0.36 per continuous watt |
| Idle draw 15% | 33 2.5 A idle (about 30 W) with nothing plugged in | 59 1.7 A idle (about 20 W) with nothing plugged in |
| Safety listing 15% | 100 ETL listed to UL/cUL 458, CSA C22.2 No. 107.1-01; meets KKK-A-1822E | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 50 3-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% | 56 90% peak efficiency (maker rating) | 89 93% peak efficiency (maker rating) |
Specifications
| Magnum Energy MS2812 | Victron Phoenix 12/3000 120V | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter |
| Continuous power | 2,800 W | 2,400 W |
| Surge power | 3,900 W for 5 s | 6,000 W |
| DC input range | 9 to 16.8 V | 9.5 to 17 V |
| Idle draw | 2.5 A (30 W) | 1.7 A (20 W) |
| Power-saving draw | 0.7 A | 0.7 A |
| Peak efficiency | 90% | 93% |
| Connections | ||
| AC outlets | 0 | 0 |
| GFCI outlets | No | No |
| Hardwire terminal | Yes | Yes |
| USB ports | None | None |
| Transfer switch | Yes | No |
| Charger | 125 A | - |
| Lithium charge profile | Yes | - |
| Parallel units | No | Yes |
| Control and build | ||
| Remote | Optional extra | Optional extra |
| App | Optional add-on | Optional add-on |
| Display | No | No |
| Safety listing | ETL listed to UL/cUL 458, CSA C22.2 No. 107.1-01; meets KKK-A-1822E | No |
| Cooling | fan | fan |
| Dimensions | 13.75 x 12.65 x 8.0 in (34.9 x 32.1 x 20.3 cm) | 362 x 258 x 218 mm (14.3 x 10.2 x 8.6 in) |
| Weight | 55 lb | 38 lb |
| Warranty | 3 years | 5 years |