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
The OutBack Radian GS8048A is the better 48V inverter overall, rated 3.7 to 3.6. The OutBack Radian GS8048A leads on safety listing, warranty and efficiency. The Ampinvt GP 6000W 48V Split Phase wins on value and features. The Ampinvt GP 6000W 48V Split Phase costs $3,775 less ($685 vs $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
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 GS8048A for safety listing (ETL listed to UL 1741 (2nd Ed. with supplement SA) and CSA C22.2 No. 107.1 vs no UL 458 or UL 1741 listing stated), warranty (5-year warranty vs 2-year warranty) and efficiency (93% peak efficiency (maker rating) vs 90% peak efficiency (maker rating)).
- Choose the Ampinvt GP 6000W 48V Split Phase for value ($0.11 per continuous watt vs $0.56 per continuous watt) and features (app, lithium charge profile, 120/240 V split-phase, display vs optional remote, app add-on, lithium charge profile, 120/240 V split-phase, hardwire terminal).
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 GS8048A | Ampinvt GP 6000W 48V Split Phase |
|---|---|---|
| Overall rating | 3.7/5 | 3.6/5 |
| Value 30% | 0 $0.56 per continuous watt | 97 $0.11 per continuous watt |
| Idle draw 15% | 95 34 W idle with nothing plugged in | 50 idle draw not published (neutral score used) |
| Safety listing 15% | 100 ETL listed to UL 1741 (2nd Ed. with supplement SA) and CSA C22.2 No. 107.1 | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 100 5-year warranty | 25 2-year warranty |
| Features 15% | 70 optional remote, app add-on, lithium charge profile, 120/240 V split-phase, hardwire terminal | 85 app, lithium charge profile, 120/240 V split-phase, display |
| Efficiency 10% | 89 93% peak efficiency (maker rating) | 56 90% peak efficiency (maker rating) |
Specifications
| OutBack Radian GS8048A | Ampinvt GP 6000W 48V Split Phase | |
|---|---|---|
| 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 | 8,000 W | 6,000 W |
| Surge power | 12,000 W for 5 s | 18,000 W |
| 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% | 90% |
| Connections | ||
| AC outlets | 0 | - |
| GFCI outlets | No | - |
| Hardwire terminal | Yes | - |
| USB ports | None | - |
| Transfer switch | Yes | Yes |
| Pass-through rating | 50 A | - |
| Charger | 115 A | 80 A |
| Lithium charge profile | Yes | Yes |
| Parallel units | Yes | Yes |
| Control and build | ||
| Remote | Optional extra | - |
| App | Optional add-on | Built in |
| Display | No | Yes |
| Safety listing | ETL listed to UL 1741 (2nd Ed. with supplement SA) and CSA C22.2 No. 107.1 | No |
| 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) | - |
| Weight | 125 lb | 70.5 lb |
| Warranty | 5 years | 2 years |