The Victron MultiPlus-II 48/5000 120V rates 4.4 among 120V inverter-chargers 48V inverters; the WZRELB 4000W 48V Split Phase (SPWR) rates 3.3 among over 1,500 W ones. The WZRELB 4000W 48V Split Phase (SPWR) costs $814.27 less ($493.05 vs $1,307.32).
A strong 48 V inverter-charger for an off-grid home or whole-house backup on 120 V. It handles big loads, charges fast from a generator, and carries the certifications inspectors ask for.
Amazon Northern Arizona Wind & Sun $1,307.32A cheap split-phase inverter for a cabin or shop that needs some 240 V. Buy it for the price, not the paperwork.
Amazon $493.05Prices 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.
These two sit in different size classes (120V 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 | Victron MultiPlus-II 48/5000 120V | WZRELB 4000W 48V Split Phase (SPWR) |
|---|---|---|
| Overall rating | 4.4/5 | 3.3/5 |
| Value 30% | 73 $0.33 per continuous watt | 88 $0.12 per continuous watt |
| Idle draw 15% | 93 15 W idle with nothing plugged in | 50 idle draw not published (neutral score used) |
| Safety listing 15% | 100 LabTest certified to UL 1741 and CSA C22.2 No. 107.1 (LC22395-1) and to UL 458 (LC26-6384-1) | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 100 5-year warranty | 0 1-year warranty |
| Features 15% | 50 optional remote, app add-on, lithium charge profile, hardwire terminal | 60 remote included, 120/240 V split-phase, hardwire terminal, display; no app |
| Efficiency 10% | 100 96% peak efficiency (maker rating) | 73 91.6% peak efficiency (maker rating) |
| Victron MultiPlus-II 48/5000 120V | WZRELB 4000W 48V Split Phase (SPWR) | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter |
| AC output | 120 V | 120/240 V split-phase |
| Continuous power | 4,000 W | 4,000 W |
| Surge power | 9,000 W | 8,000 W |
| DC input range | 38 to 66 V | - |
| Idle draw | 15 W (0.3 A at 48 V) | - |
| Power-saving draw | 3 W | - |
| Peak efficiency | 96% | 91.6% |
| Connections | ||
| AC outlets | 0 | 5 |
| GFCI outlets | No | - |
| Hardwire terminal | Yes | Yes |
| USB ports | None | - |
| Transfer switch | Yes | No |
| Pass-through rating | 95 A | - |
| Charger | 70 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 | LabTest certified to UL 1741 and CSA C22.2 No. 107.1 (LC22395-1) and to UL 458 (LC26-6384-1) | No |
| Design | - | High-frequency |
| Cooling | fan | fan |
| Dimensions | 676 x 330 x 164 mm (26.6 x 13.0 x 6.5 in) | 17 x 9.9 x 5.3 in |
| Weight | 71 lb | 15.8 lb |
| Warranty | 5 years | 1 year |
