OutBack Radian GS8048A
For an off-grid home or whole-house backup that needs 240 V loads from one inverter. A proven heavy transformer design with grid and generator inputs, at a high price.
Amazon $4,460$4,460
3.7/5
For a small off-grid home that needs 240 V for a well pump but only 4 kW of steady load. Hard to find now, so check stock before designing around it.
- 4,000 WContinuous
- 6,000 WSurge
- 120/240 V split-phaseOutput
- 34 WIdle draw
- YesUL listed
- 5 yearsWarranty
Check price at Solar Cellz USA$2,995.75
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Gives 120/240 V split-phase from a single 4 kW unit
- Two AC inputs take grid and generator without an external switch
- Stacks up to ten units as loads grow
- ETL listed to UL 1741, so inspectors and utilities accept it
Cons
- Draws 34 W idle, as much as the 8 kW model
- Needs a MATE3s display, sold separately, to set up and monitor
- Hard to find in stock now
The OutBack Radian A-Series family
Every OutBack Radian A-Series model we rank, smallest first. Ratings compare each against its own size.
| Model | Continuous | Rating | Price |
|---|---|---|---|
| OutBack Radian GS4048A (this one) | 4,000 W | 3.7/5 | $2,995.75 |
| OutBack Radian GS8048A | 8,000 W | 3.7/5 | $4,460 |
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 | GS4048A-01 |
|---|---|
| Output | |
| Type | Pure sine wave inverter-charger |
| AC output | 120/240 V split-phase |
| Continuous power | 4,000 W |
| Surge power | 6,000 W for 5 s |
| DC input range | 40 to 64 V |
| Idle draw | 34 W (0.7 A at 48 V) |
| Power-saving draw | 10 W |
| Peak efficiency | 93% |
| Connections | |
| AC outlets | 0 |
| GFCI outlets | No |
| Hardwire terminal | Yes |
| USB ports | None |
| Transfer switch | Yes |
| Pass-through rating | 50 A |
| Charger | 57.5 A |
| Lithium charge profile | Yes |
| Parallel units | Yes |
| Control and build | |
| Remote | Optional extra |
| App | Optional add-on |
| Display | No |
| Safety listing | ETL listed to UL 1741 (2nd Ed. with supplement SA) and CSA C22.2 No. 107.1 |
| Design | Low-frequency (transformer) |
| Cooling | fan |
| Dimensions | 28 x 16 x 8.75 in (71.1 x 40.6 x 22.2 cm) |
| Weight | 82 lb |
| Warranty | 5 years |
| Released | 2013-11 |
Alternatives in this size
Magnum MS4448PAE
For permitted 48 V off-grid or backup homes that need listed split-phase power and room to stack more units later.
Mr. Solar $2,239.20$2,239.20
Ampinvt GP 6000W 48V Split Phase
A low-cost split-phase inverter-charger for an off-grid home that may add units later. Strong charger and parallel support, but no safety listing.
Amazon $685$685
Compare
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