OutBack Radian GS4048A
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.
Solar Cellz USA $2,995.75$2,995.75
3.6/5
For permitted 48 V off-grid or backup homes that need listed split-phase power and room to stack more units later.
- 4,400 WContinuous
- 8,500 WSurge
- 120/240 V split-phaseOutput
- 25 WIdle draw
- YesUL listed
- 3 yearsWarranty
Check price at Mr. Solar$2,239.20
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 120/240 V split-phase from one unit runs 240 V pumps and dryers
- Stacks up to four units as a home grows
- Listed to UL 1741 for permitted home installs
- Holds 8,500 W for 5 seconds to start large motors
Cons
- No lithium charge preset in the documents
- Remote, hub and monitoring kit all cost extra
- 25 W idle draw when search mode is off
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 | MS4448PAE |
|---|---|
| Output | |
| Type | Pure sine wave inverter-charger |
| AC output | 120/240 V split-phase |
| Continuous power | 4,400 W |
| Surge power | 8,500 W for 5 s |
| DC input range | 36 to 64 V |
| Idle draw | 25 W (0.5 A at 48 V) |
| Power-saving draw | 6 W |
| Peak efficiency | 94% |
| Connections | |
| AC outlets | 0 |
| GFCI outlets | No |
| Hardwire terminal | Yes |
| USB ports | None |
| Transfer switch | Yes |
| Pass-through rating | 30 A |
| Charger | 60 A |
| Parallel units | Yes |
| Control and build | |
| Remote | Optional extra |
| App | Optional add-on |
| Display | No |
| Safety listing | ETL listed to UL 1741 (1st Ed.) and CSA C22.2 No. 107.1-01 |
| Design | Low-frequency (transformer) |
| Cooling | fan |
| Weight | 55 lb |
| Warranty | 3 years |
Alternatives in this size
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
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
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