The Victron MultiPlus-II 48/5000 120V rates 4.4 among 120V inverter-chargers 48V inverters; the Cotek SP-4000-148 rates 2.3 among over 1,500 W ones. The Victron MultiPlus-II 48/5000 120V costs $8.68 less ($1,307.32 vs $1,316).
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 4,000 W hardwired inverter for a 48 V off-grid panel feed, with good efficiency but a short warranty.
Amazon $1,316Prices 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 | Cotek SP-4000-148 |
|---|---|---|
| Overall rating | 4.4/5 | 2.3/5 |
| Value 30% | 73 $0.33 per continuous watt | 33 $0.33 per continuous watt |
| Idle draw 15% | 93 15 W idle with nothing plugged in | 5 48 W idle with nothing plugged in |
| 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 | 25 2-year warranty |
| Features 15% | 50 optional remote, app add-on, lithium charge profile, hardwire terminal | 20 optional remote, hardwire terminal; no app |
| Efficiency 10% | 100 96% peak efficiency (maker rating) | 67 91% peak efficiency (maker rating) |
| Victron MultiPlus-II 48/5000 120V | Cotek SP-4000-148 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter-charger | Pure sine wave inverter |
| AC output | 120 V | 120 V |
| Continuous power | 4,000 W | 4,000 W |
| Surge power | 9,000 W | 8,000 W for 1 s |
| DC input range | 38 to 66 V | 42 to 66 V |
| Idle draw | 15 W (0.3 A at 48 V) | 48 W (1 A at 48 V) |
| Power-saving draw | 3 W | 4.8 W |
| Peak efficiency | 96% | 91% |
| Connections | ||
| AC outlets | 0 | 0 |
| GFCI outlets | No | No |
| Hardwire terminal | Yes | Yes |
| USB ports | None | 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 | Optional extra |
| App | Optional add-on | No |
| Display | No | No |
| Safety listing | LabTest certified to UL 1741 and CSA C22.2 No. 107.1 (LC22395-1) and to UL 458 (LC26-6384-1) | No |
| Cooling | fan | load-controlled fan |
| Dimensions | 676 x 330 x 164 mm (26.6 x 13.0 x 6.5 in) | 255 x 158 x 462 mm (10.0 x 6.2 x 18.2 in) |
| Weight | 71 lb | 22 lb |
| Warranty | 5 years | 2 years |
