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 is the better 12V inverter overall, rated 3.5 to 3.1. The Magnum Energy MS2012 wins on idle draw.
Magnum Energy MS2012
#35 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.
Amazon $2,110.43$2,110.43
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 Magnum Energy MS2012 for idle draw (2.1 A idle (about 25 W) with nothing plugged in vs 2.5 A idle (about 30 W) with nothing plugged in).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every inverter-chargers 12V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Magnum Energy MS2812 | Magnum Energy MS2012 |
|---|---|---|
| Overall rating | 3.5/5 | 3.1/5 |
| Value 30% | 50 no current price (neutral score used) | 0 $1.05 per continuous watt |
| Idle draw 15% | 33 2.5 A idle (about 30 W) with nothing plugged in | 50 2.1 A idle (about 25 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 | 100 ETL listed to UL/cUL 458, CSA C22.2 No. 107.1-01; meets KKK-A-1822E |
| Warranty 15% | 50 3-year warranty | 50 3-year warranty |
| Features 15% | 65 optional remote, app add-on, lithium charge profile, hardwire terminal | 65 optional remote, app add-on, lithium charge profile, hardwire terminal |
| Efficiency 10% | 56 90% peak efficiency (maker rating) | 62 90.6% peak efficiency (maker rating) |
Specifications
| Magnum Energy MS2812 | Magnum Energy MS2012 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter-charger |
| Continuous power | 2,800 W | 2,000 W |
| Surge power | 3,900 W for 5 s | 3,300 W for 5 s |
| DC input range | 9 to 16.8 V | 9 to 16.8 V |
| Idle draw | 2.5 A (30 W) | 2.1 A (25 W) |
| Power-saving draw | 0.7 A | 0.7 A |
| Peak efficiency | 90% | 90.6% |
| Connections | ||
| AC outlets | 0 | 0 |
| GFCI outlets | No | No |
| Hardwire terminal | Yes | Yes |
| USB ports | None | None |
| Transfer switch | Yes | Yes |
| Charger | 125 A | 100 A |
| Lithium charge profile | Yes | Yes |
| Parallel units | No | No |
| 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 | ETL listed to UL/cUL 458, CSA C22.2 No. 107.1-01; meets KKK-A-1822E |
| Cooling | fan | fan |
| Dimensions | 13.75 x 12.65 x 8.0 in (34.9 x 32.1 x 20.3 cm) | 13.75 x 12.65 x 8.0 in (34.9 x 32.1 x 20.3 cm) |
| Weight | 55 lb | 42 lb |
| Warranty | 3 years | 3 years |