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 is the better 48V inverter overall, rated 3.8 to 3.2. The Magnum MS4048-L leads on value, warranty and efficiency. The Magnum MS4048-L costs $781.70 less ($2,026 vs $2,807.70).
Xantrex Freedom EX 4000
For a 48 V RV, bus or boat that wants inverter, charger, transfer switch and 12 V converter in one box. It replaces several components, but idles high and carries a short warranty.
Amazon $2,807.70$2,807.70
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 MS4048-L for value ($0.51 per continuous watt vs $0.70 per continuous watt), warranty (3-year warranty vs 2-year warranty) and efficiency (94% peak efficiency (maker rating) vs 91% peak efficiency (maker rating)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 120V inverter-chargers 48V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Magnum MS4048-L | Xantrex Freedom EX 4000 |
|---|---|---|
| Overall rating | 3.8/5 | 3.2/5 |
| Value 30% | 45 $0.51 per continuous watt | 15 $0.70 per continuous watt |
| Idle draw 15% | 79 25 W idle with nothing plugged in | 71 30 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) | 100 CSA certified to CSA 107.1, UL 458 and UL 458 Marine Supplement |
| Warranty 15% | 50 3-year warranty | 25 2-year warranty |
| Features 15% | 50 optional remote, app add-on, lithium charge profile, hardwire terminal | 45 optional remote, lithium charge profile, hardwire terminal; no app |
| Efficiency 10% | 100 94% peak efficiency (maker rating) | 67 91% peak efficiency (maker rating) |
Specifications
| Magnum MS4048-L | Xantrex Freedom EX 4000 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter-charger |
| AC output | 120 V | 120 V |
| Continuous power | 4,000 W | 4,000 W |
| Surge power | 8,500 W for 5 s | 8,000 W for 5 s |
| DC input range | 36 to 67.6 V | 40 to 64 V |
| Idle draw | 25 W (0.5 A at 48 V) | 30 W (0.6 A at 48 V) |
| Power-saving draw | 8 W | - |
| Peak efficiency | 94% | 91% |
| 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 | 50 A |
| Charger | 60 A | 80 A |
| Lithium charge profile | Yes | Yes |
| Parallel units | No | Yes |
| Control and build | ||
| Remote | Optional extra | Optional extra |
| App | Optional add-on | No |
| Display | No | - |
| Safety listing | ETL listed to UL/cUL 458 and CSA C22.2 No. 107.1-01; UL 1741 certificate (ATM) | CSA certified to CSA 107.1, UL 458 and UL 458 Marine Supplement |
| Design | Low-frequency (transformer) | - |
| Cooling | fan | load-controlled fan |
| Dimensions | 13.75 x 12.65 x 8 in (349 x 321 x 203 mm) | 17.1 x 14 x 8.1 in (434 x 354 x 205 mm) |
| Weight | 55 lb | 79.4 lb |
| Warranty | 3 years | 2 years |