Sigineer HP15048D
For large unpermitted off-grid homes that want 15 kW of split-phase power from one 48 V box, accepting high idle draw.
Sigineer $3,099$3,099
The Sigineer HP15048D is the better 48V inverter overall, rated 2.8 to 2.6. The Sigineer HP15048D leads on efficiency. The Sigineer HP15048D costs $500 less ($3,099 vs $3,599).
Sigineer HP18048D
For large unpermitted off-grid homes that want 18 kW of split-phase power from one 48 V box, accepting high idle draw.
Sigineer $3,599$3,599
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 Sigineer HP15048D for efficiency (90% peak efficiency (maker rating) vs 85% peak efficiency (maker rating)).
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 | Sigineer HP15048D | Sigineer HP18048D |
|---|---|---|
| Overall rating | 2.8/5 | 2.6/5 |
| Value 30% | 76 $0.21 per continuous watt | 78 $0.20 per continuous watt |
| Idle draw 15% | 0 300 W idle with nothing plugged in | 0 350 W idle with nothing plugged in |
| Safety listing 15% | 0 no UL 458 or UL 1741 listing stated | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 0 1-year warranty | 0 1-year warranty |
| Features 15% | 60 optional remote, lithium charge profile, 120/240 V split-phase, hardwire terminal; no app | 60 optional remote, lithium charge profile, 120/240 V split-phase, hardwire terminal; no app |
| Efficiency 10% | 56 90% peak efficiency (maker rating) | 0 85% peak efficiency (maker rating) |
Specifications
| Sigineer HP15048D | Sigineer HP18048D | |
|---|---|---|
| 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 | 15,000 W | 18,000 W |
| Surge power | 45,000 W for 20 s | 54,000 W for 20 s |
| DC input range | 40 to 64 V | 40 to 64 V |
| Idle draw | 300 W (6.2 A at 48 V) | 350 W (7.3 A at 48 V) |
| Power-saving draw | 40 W | 45 W |
| Peak efficiency | 90% | 85% |
| Connections | ||
| AC outlets | 0 | 0 |
| GFCI outlets | No | No |
| Hardwire terminal | Yes | Yes |
| USB ports | None | None |
| Transfer switch | Yes | Yes |
| Charger | 100 A | 60 A |
| Lithium charge profile | Yes | Yes |
| Parallel units | No | No |
| Control and build | ||
| Remote | Optional extra | Optional extra |
| App | No | No |
| Display | No | No |
| Safety listing | No | No |
| Design | Low-frequency (transformer) | Low-frequency (transformer) |
| Cooling | fan | fan |
| Dimensions | 28 x 16.3 x 8.8 in (706 x 415 x 232 mm) | 32 x 16.3 x 8 in (806 x 415 x 212 mm) |
| Weight | 182 lb | 220 lb |
| Warranty | 1 year | 1 year |