Magnum MS4048-L
For a 48 V RV, cabin or backup system that needs a rugged, listed 120 V inverter-charger with big surge.
ResSupply $2,026 A1 Solar Store $2,531.49$2,026
The Magnum MS4048-L rates 3.8 among 120V inverter-chargers 48V inverters; the AIMS Power 4000W 48V Split Phase rates 3.1 among split-phase inverter-chargers ones. The AIMS Power 4000W 48V Split Phase costs $534 less ($1,492 vs $2,026).
AIMS Power 4000W 48V Split Phase
For a small off-grid home that needs 120/240 V split phase from a 48 V bank on a tight budget, fed by a 240 V generator. Larger homes should step up to the 6 kW.
Amazon $1,492$1,492
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 (120V inverter-chargers and split-phase inverter-chargers), 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 MS4048-L | AIMS Power 4000W 48V Split Phase |
|---|---|---|
| Overall rating | 3.8/5 | 3.1/5 |
| Value 30% | 45 $0.51 per continuous watt | 39 $0.37 per continuous watt |
| Idle draw 15% | 79 25 W idle with nothing plugged in | 87 48 W idle with nothing plugged in |
| Safety listing 15% | 100 ETL listed to UL/cUL 458 and CSA C22.2 No. 107.1-01; UL 1741 certificate (ATM) | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 50 3-year warranty | 50 3-year warranty |
| Features 15% | 50 optional remote, app add-on, lithium charge profile, hardwire terminal | 70 optional remote, app add-on, lithium charge profile, 120/240 V split-phase, hardwire terminal |
| Efficiency 10% | 100 94% peak efficiency (maker rating) | 33 88% peak efficiency (maker rating) |
Specifications
| Magnum MS4048-L | AIMS Power 4000W 48V Split Phase | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter-charger |
| AC output | 120 V | 120/240 V split-phase |
| Continuous power | 4,000 W | 4,000 W |
| Surge power | 8,500 W for 5 s | 12,000 W for 20 s |
| DC input range | 36 to 67.6 V | 40 to 64 V |
| Idle draw | 25 W (0.5 A at 48 V) | 48 W (1 A at 48 V) |
| Power-saving draw | 8 W | 19.4 W |
| Peak efficiency | 94% | 88% |
| Connections | ||
| AC outlets | 0 | 0 |
| GFCI outlets | No | No |
| Hardwire terminal | Yes | Yes |
| USB ports | None | None |
| Transfer switch | Yes | Yes |
| Pass-through rating | 30 A | 30 A |
| Charger | 60 A | 40 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 and CSA C22.2 No. 107.1-01; UL 1741 certificate (ATM) | No |
| Design | Low-frequency (transformer) | Low-frequency (transformer) |
| Cooling | fan | load-controlled fan |
| Dimensions | 13.75 x 12.65 x 8 in (349 x 321 x 203 mm) | 28.25 x 8.88 x 7.5 in |
| Weight | 55 lb | 57 lb |
| Warranty | 3 years | 3 years |