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
The OutBack Radian GS4048A is the better 48V inverter overall, rated 3.7 to 3.5. The OutBack Radian GS4048A leads on warranty. The Samlex EVO-4248SP costs $766.85 less ($2,228.90 vs $2,995.75).
Samlex EVO-4248SP
For a 48 V off-grid home or backup system that needs 120/240 V from a single listed inverter-charger.
Battery Stuff $2,228.90 Don Rowe $2,228.90$2,228.90
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 OutBack Radian GS4048A for warranty (5-year warranty vs 3-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every split-phase inverter-chargers 48V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | OutBack Radian GS4048A | Samlex EVO-4248SP |
|---|---|---|
| Overall rating | 3.7/5 | 3.5/5 |
| Value 30% | 0 $0.75 per continuous watt | 4 $0.53 per continuous watt |
| Idle draw 15% | 95 34 W idle with nothing plugged in | 97 30 W idle with nothing plugged in |
| Safety listing 15% | 100 ETL listed to UL 1741 (2nd Ed. with supplement SA) and CSA C22.2 No. 107.1 | 100 CSA listed; conforms to UL 1741 2nd Ed. and CAN/CSA C22.2 No. 107.1 |
| Warranty 15% | 100 5-year warranty | 50 3-year warranty |
| Features 15% | 70 optional remote, app add-on, lithium charge profile, 120/240 V split-phase, hardwire terminal | 65 optional remote, lithium charge profile, 120/240 V split-phase, hardwire terminal; no app |
| Efficiency 10% | 89 93% peak efficiency (maker rating) | 89 93% peak efficiency (maker rating) |
Specifications
| OutBack Radian GS4048A | Samlex EVO-4248SP | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter-charger |
| AC output | 120/240 V split-phase | 120/240 V split-phase |
| Continuous power | 4,000 W | 4,200 W |
| Surge power | 6,000 W for 5 s | 6,300 W for 30 s |
| DC input range | 40 to 64 V | 36 to 68 V |
| Idle draw | 34 W (0.7 A at 48 V) | 30 W (0.6 A at 48 V) |
| Power-saving draw | 10 W | 8 W |
| Peak efficiency | 93% | 93% |
| Connections | ||
| AC outlets | 0 | 0 |
| GFCI outlets | No | No |
| Hardwire terminal | Yes | Yes |
| USB ports | None | None |
| Transfer switch | Yes | Yes |
| Pass-through rating | 50 A | 40 A |
| Charger | 57.5 A | 60 A |
| Lithium charge profile | Yes | Yes |
| Parallel units | Yes | No |
| Control and build | ||
| Remote | Optional extra | Optional extra |
| App | Optional add-on | No |
| Display | No | - |
| Safety listing | ETL listed to UL 1741 (2nd Ed. with supplement SA) and CSA C22.2 No. 107.1 | CSA listed; conforms to UL 1741 2nd Ed. and CAN/CSA C22.2 No. 107.1 |
| Design | Low-frequency (transformer) | Low-frequency (transformer) |
| Cooling | fan | fan |
| Dimensions | 28 x 16 x 8.75 in (71.1 x 40.6 x 22.2 cm) | 324 x 415 x 212 mm (12.8 x 16.3 x 8.3 in) |
| Weight | 82 lb | 64 lb |
| Warranty | 5 years | 3 years |
| Released | 2013-11 | - |