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 rates 3.7 among split-phase inverter-chargers 48V inverters; the WZRELB 8000W 48V Split Phase (SPWR) rates 3.1 among over 1,500 W ones. The WZRELB 8000W 48V Split Phase (SPWR) costs $2,891.72 less ($1,568.28 vs $4,460).
WZRELB 8000W 48V Split Phase (SPWR)
#11 in Over 1,500 WFull review
A big high-frequency split-phase inverter for off-grid homes on a budget. At this price, listed low-frequency units with real spec sheets are worth a look first.
Amazon $1,568.28$1,568.28
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.
Scores side by side
These two sit in different size classes (split-phase inverter-chargers and over 1,500 W), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | OutBack Radian GS8048A | WZRELB 8000W 48V Split Phase (SPWR) |
|---|---|---|
| Overall rating | 3.7/5 | 3.1/5 |
| Value 30% | 0 $0.56 per continuous watt | 69 $0.20 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 | 0 1-year warranty |
| Features 15% | 70 optional remote, app add-on, lithium charge profile, 120/240 V split-phase, hardwire terminal | 60 remote included, 120/240 V split-phase, hardwire terminal, display; no app |
| Efficiency 10% | 89 93% peak efficiency (maker rating) | 73 91.6% peak efficiency (maker rating) |
Specifications
| OutBack Radian GS8048A | WZRELB 8000W 48V Split Phase (SPWR) | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter |
| AC output | 120/240 V split-phase | 120/240 V split-phase |
| Continuous power | 8,000 W | 8,000 W |
| Surge power | 12,000 W for 5 s | 16,000 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% | 91.6% |
| Connections | ||
| AC outlets | 0 | 4 |
| GFCI outlets | No | - |
| Hardwire terminal | Yes | Yes |
| USB ports | None | - |
| Transfer switch | Yes | No |
| Pass-through rating | 50 A | - |
| Charger | 115 A | - |
| Lithium charge profile | Yes | - |
| Parallel units | Yes | No |
| Control and build | ||
| Remote | Optional extra | Included |
| App | Optional add-on | No |
| 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) | High-frequency |
| Cooling | fan | fan |
| Dimensions | 28 x 16 x 8.75 in (71.1 x 40.6 x 22.2 cm) | 23 x 12 x 6.2 in |
| Weight | 125 lb | 37 lb |
| Warranty | 5 years | 1 year |