OutBack FXR3048A
For a dusty, humid or coastal off-grid site where a sealed inverter earns its keep. Built to last, but it costs more and idles higher than newer designs.
Northern Arizona Wind & Sun $2,314$2,314
3.2/5
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.
- 4,000 WContinuous
- 8,000 WSurge
- 120 VOutput
- 30 WIdle draw
- YesUL listed
- 2 yearsWarranty
Check price at Amazon$2,807.70
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Replaces a separate 48-to-12 V converter with a built-in 45 A one
- Surges to 8,000 W for 5 seconds for air conditioner starts
- Passes 50 A split-phase shore power through to 240 V loads
- Talks RV-C or NMEA 2000 to the rig’s existing displays
Cons
- Idles at up to 30 W, a drain on an RV or boat bank
- Only a 2-year warranty
- Remote panel costs extra
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 | 820-4080-41 |
|---|---|
| Output | |
| Type | Pure sine wave inverter-charger |
| AC output | 120 V |
| Continuous power | 4,000 W |
| Surge power | 8,000 W for 5 s |
| DC input range | 40 to 64 V |
| Idle draw | 30 W (0.6 A at 48 V) |
| Peak efficiency | 91% |
| Connections | |
| AC outlets | 0 |
| GFCI outlets | No |
| Hardwire terminal | Yes |
| USB ports | None |
| Transfer switch | Yes |
| Pass-through rating | 50 A |
| Charger | 80 A |
| Lithium charge profile | Yes |
| Parallel units | Yes |
| Control and build | |
| Remote | Optional extra |
| App | No |
| Safety listing | CSA certified to CSA 107.1, UL 458 and UL 458 Marine Supplement |
| Cooling | load-controlled fan |
| Dimensions | 17.1 x 14 x 8.1 in (434 x 354 x 205 mm) |
| Weight | 79.4 lb |
| Warranty | 2 years |
Alternatives in this size
Victron Quattro 48/3000 120V
For a 48 V cabin or boat that needs two AC inputs, such as grid plus generator, in a 3 kVA size. Buyers with one AC source get lower idle draw and UL listings from the MultiPlus-II 48/3000.
Backwoods Solar $1,310.70$1,310.70
AIMS Power 2000W 48V Inverter Charger
For a small 48 V off-grid cabin or backup setup that wants transformer-based surge and a built-in charger at a modest price. Its 20 A charger suits smaller banks.
Amazon $1,007$1,007
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