Sunways STH 4–12 kW | HV Series
The Sunways STH 4–12 kW (HT) series are three-phase hybrid inverters designed for commercial to large residential installations that require both on-grid and backup capability. They support high-voltage battery systems (wide battery voltage window), fast UPS switching (<10 ms), and robust overload capability (short-term peak output and long-duration overload modes). With a maximum efficiency up to 98.2%, IP65 protection, and flexible battery communication (CAN / RS485), this series targets hybrid solar + storage systems, small commercial sites, shops/offices and residential projects that may scale by adding parallel units or larger battery banks.
🌟 Key Features
✔ Power range (rated):
4 kW → 12 kW (models: 4KTL, 5KTL, 6KTL, 8KTL, 10KTL, 12KTL)
✔ Max efficiency
up to 98.2%
✔ Protection
IP65 (outdoor capable)
✔Overload
up to 200% backup output (short-term/peak modes noted)
✔ Battery voltage range
140–750 V (wide HV battery support)
✔ MPPT
2 MPPTs (2 inputs total) with wide MPPT voltage range (150–850 V or 200–850 V depending on model)
✔ UPS switching time
< 10 ms (uninterruptible supply)
✔ Cooling
Natural convection (quiet, <25 dB)
Model Comparison (Key Ratings)
| Model | Max DC Input Power (W) | Start-up Voltage (V) | Max DC Input Voltage (V) | Rated DC Input Voltage (V) | MPPT Voltage Range (V) |
|---|---|---|---|---|---|
| STH-4KTL-HT-P | 6,400 | 150 | 1,000 | 620 | 150–850 |
| STH-5KTL-HT-P | 8,000 | 150 | 1,000 | 620 | 150–850 |
| STH-6KTL-HT-P | 9,600 | 180 | 1,000 | 620 | 200–850 |
| STH-8KTL-HT-P | 12,800 | 180 | 1,000 | 620 | 200–850 |
| STH-10KTL-HT-P | 16,000 | 180 | 1,000 | 620 | 200–850 |
| STH-12KTL-HT-P | 19,200 | 180 | 1,000 | 620 | 200–850 |
Battery
| Battery Communication | CAN / RS485 |
| Battery Voltage Range | 140–750 V |
| Max Charge / Discharge Current | 25 A / 25 A |
| Built-in Fuse (Rated Current) | 63 A |
Output (Grid Mode)
| Rated Output Power (W) | Max Output Power (W) | Max Apparent Power (VA) | Grid Type | Rated Frequency | Max Output Current (A) |
|---|---|---|---|---|---|
| 4,000 • 5,000 • 6,000 • 8,000 • 10,000 • 12,000 | 4,400 • 5,500 • 6,600 • 8,800 • 11,000 • 13,200 | 4,400 • 5,500 • 6,600 • 8,800 • 11,000 • 13,200 | 3L / N / PE, 230/400 V | 50 / 60 Hz | 6.7 • 8.3 • 10 • 13.3 • 16.5 • 20 |
Output (Backup Mode)
| Rated Backup Output | Same as Grid Output (4 kW → 12 kW) |
| Max Apparent Backup Power | 4,400 – 13,200 VA |
| Peak Output (60 sec) | 8,000 – 20,000 VA |
| Peak Output per Phase | 1,600 – 5,000 VA |
| UPS Switching Time | < 10 ms |
Efficiency
| Max Efficiency | 98.1% – 98.2% |
| Euro Efficiency | 97.3% – 97.4% |
| MPPT Efficiency | 99.9% |
| Battery Conversion Efficiency | 97.2% – 97.3% |
Protection & General Data
Protection
| DC Reverse Polarity | Integrated |
| Battery Reverse Connection | Integrated |
| Insulation Resistance | Integrated |
| DC Switch | Optional |
| Surge Protection | Integrated |
| Over-Temperature | Integrated |
| Residual Current | Integrated |
| Anti-Islanding | Integrated |
| AC Over-voltage | Integrated |
| Overload | Integrated |
| AC Short-circuit | Integrated |
General Data
| Dimensions (mm) | 550 × 410 × 175 |
| Weight | 26 – 28 kg |
| Protection Degree | IP65 |
| Night Self-consumption | < 15 W |
| Topology | Transformerless |
| Operating Temperature | −30°C ~ +60°C |
| Humidity | 0% – 100% |
| Operating Altitude | 4000 m (derating > 3000 m) |
| Cooling | Natural Convection |
| Noise Level | < 25 dB |
| Display | OLED & LED |
| Communication | WiFi / LAN (Optional) |