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
3.6/5
A cheap low-frequency inverter-charger for a 48 V backup or off-grid system on 120 V. Documentation is thin and idle draw is high.
- 6,000 WContinuous
- 18,000 WSurge
- 120 VOutput
- 33.6 WIdle draw
- NoUL listed
Check price at Amazon$539.90
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- About 9 cents per watt for a 6,000 W inverter-charger
- Recharges the bank from grid or generator at up to 50 A and passes power through
- Heavy transformer design built for motor starts
- Remote panel on a 33 ft cable included
Cons
- Draws about 34 W idle, a lot to leave on around the clock
- No published efficiency, warranty or safety listing
- 120 V only, so no 240 V well pump or dryer
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | BL-W6048V-L |
|---|---|
| Output | |
| Type | Pure sine wave inverter-charger |
| AC output | 120 V |
| Continuous power | 6,000 W |
| Surge power | 18,000 W |
| DC input range | 40 to 58 V |
| Idle draw | 33.6 W (0.7 A at 48 V) |
| Connections | |
| AC outlets | 6 |
| Transfer switch | Yes |
| Charger | 50 A |
| Lithium charge profile | Yes |
| Parallel units | No |
| Control and build | |
| Remote | Included |
| App | No |
| Display | Yes |
| Safety listing | No |
| Design | Low-frequency (transformer) |
| Dimensions | 23.23 x 11.22 x 7.87 in |
| Weight | 61.7 lb |
Alternatives in this size
Victron MultiPlus 48/2000 120V
A compact inverter-charger for a small 48 V cabin or boat with a generator or shore feed. Pick a MultiPlus-II 48/3000 for more power and a UL listing.
Northern Arizona Wind & Sun $785.42$785.42
Victron Quattro 48/5000 120V
For an off-grid home or large boat that switches between grid and generator and needs big motor-starting power. The MultiPlus-II 48/5000 idles lower and has published UL certificates if one AC input is enough.
Amazon $1,785 Backwoods Solar $1,638.85$1,638.85
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