Growatt WIT-28-55K-HU
Growatt — the world's #1 residential solar inverter brand by Wood Mackenzie. The WIT 28-55K-HU is a three-phase commercial hybrid inverter (4–100 kW). Designed for schools, mosques, agritech farms, and SMEs across the Middle East replacing diesel gensets with PV+battery.
Technical Specifications
| Parameter | WIT-28-55K-HU |
|---|---|
| Electrical Data | |
| Max. recommended PV power (for module STC) | 56kW / 75.6kW / 86.4kW / 108kW |
| No. of MPPT trackers | 5 / 7 / 8 / 10 |
| AC nominal power/max. AC apparent power | 28kW/30.8kVA / 35kW/38.5kVA / 40kW/44kVA / 55kW/60.5kVA |
| Max. output current | 85.4A@208V / 106.9A@208V / 122.2A@208V / 168.1A@208V |
| Max. charging / discharging current | 79A / 99A / 113A / 156A |
| Continuous charging / discharging power | 31.7kW / 39.7kW / 45.3kW / 62.3kW |
| PV Input | |
| Start voltage | 195V |
| Max. open circuit voltage of PV | 630V |
| MPPT voltage range | 360V-1000V / 360V-550V / 360V-550V / 360V-550V |
| Max. input current per MPPT tracker | 32A |
| Max. short-circuit current per MPPT tracker | 40A |
| No. of PV strings per MPPT tracker | 2 |
| AC Output | |
| Nominal AC voltage/range | 208V/220V, -15%~10% |
| AC grid frequency/range | 60Hz, 55-65Hz |
| Adjustable power factor | -1...+1 |
| THDi | <3% (100% load) |
| AC grid connection type | 3P3W+PE/3P4W+PE |
| Battery Input | |
| Battery voltage range | 380V-650V, recommended @ 512V |
| BMS communication | RS485/CAN |
| Battery type | Lithium |
| Efficiency | |
| Max. efficiency | 98.2% |
| Protection Features | |
| PV reverse polarity protection | Yes |
| Battery reverse protection | Yes |
| AC/DC surge protection | Type II |
| Insulation resistance monitoring | Yes |
| Ground fault monitoring | Yes |
| Grid monitoring | Yes |
| Residual-current monitoring unit | Yes |
| AC short-circuit protection | Yes |
| String monitoring | Yes |
| Anti-islanding protection | Yes |
| PID protection | Yes |
| AFCI function | Opt |
| Communication | |
| Interfaces | RS485/CAN |
| Interfaces/WIFI/4G | Yes/Opt |
| Mechanical Data | |
| Dimensions (W/H/D) | 33.5/53.1/20.1 inch (850/1350/510mm) |
| Weight | 153kg/337.3lbs / 160kg/352.7lbs / 160kg/352.7lbs / 160kg/352.7lbs |
| Operating Conditions | |
| Operating temperature range | -22°F~+140°F, >122°F derating |
| Altitude | 13123ft(4000m) |
| Topology | Transformerless |
| Cooling | Smart air cooling |
| Enclosure | IP66/NEMA 4X |
| Display | OLED+LED/WIFI+APP |
Figures are measured at the test conditions the manufacturer’s datasheet states. A dash means the manufacturer publishes no figure for that model.
Availability & grid compliance in Oman
| Market | Oman |
| Grid authority / regulator | Authority for Electricity Regulation Oman |
| Quotation currency | OMR |
| Support hours timezone | Asia/Muscat |
| Delivery & installation coverage | Muscat, Salalah, Sohar |
Figures on this page are the manufacturer's own, measured at the test conditions the datasheet states — they do not change by country. What changes is the approval that has to be met before the unit is energised: in Oman that is Authority for Electricity Regulation Oman. Confirm the grid code, import requirements and any local certification with them, or with us, before you order.
Key Features & Technical Highlights
- Scalable system configuration, extend to 165kW
- Support UPS function and black start
- 100% unbalanced load when backup
- 110% continuous AC overloading capacity
- Support remote control of DG
- Grid-support functions
Frequently Asked Questions
Is the Growatt WIT 28-55K-HU approved for use in the UAE?
Yes — Growatt inverters are widely used in DEWA Shams Dubai, SEWA, FEWA, EtihadWE, and SEC Saudi Arabia installations. Verify the WIT 28-55K-HU on the latest DEWA Approved Equipment List before EPC submission. Growatt MJS Solutions can supply DEWA documentation on request.
What warranty comes with the Growatt WIT 28-55K-HU, and is it valid in the Middle East?
5-Year Manufacturer Warranty, valid across every market we serve, including UAE, KSA, Oman, Bahrain, Qatar, Kuwait, Egypt, and the wider Middle East/North Africa. Extended warranty options are available at the time of purchase. All warranty claims are processed locally through Growatt MJS Solutions in Dubai.
How do I monitor the Growatt WIT 28-55K-HU remotely?
All Growatt inverters and batteries integrate with the ShinePhone mobile app and ShineServer cloud platform. Add a ShineWiFi-X dongle or use the built-in WiFi (depending on model) for real-time monitoring, alerts, and multi-site management. The app supports English, Arabic, and 20+ languages.
What batteries does the Growatt WIT 28-55K-HU pair with?
WIT 28-55K-HU is compatible with Growatt's LFP battery range — most commonly the ARK XH, ARK HV, or APX HV stack depending on model and topology. Battery sizing depends on your daily backup load; a typical UAE villa uses 10–20 kWh of usable storage. Contact Growatt MJS Solutions for a tailored sizing recommendation.
What's the lead time for the Growatt WIT 28-55K-HU in Dubai?
In-stock units typically ship within 1–2 business days from our Dubai warehouse. For larger orders or specific configurations, lead times of 2–4 weeks may apply. Contact Growatt MJS Solutions on +971 4 255 0887 or sales@growatinverter.com for an exact quote.
How does the Growatt WIT 28-55K-HU perform in UAE summer rooftop temperatures?
Growatt inverters are rated -25 to +60 °C ambient operation, but real-world derating begins around 45 °C. For UAE rooftops where temperatures can exceed 50 °C in summer, we recommend mounting in a shaded location with good airflow, and slightly oversizing PV-to-AC ratio to compensate for afternoon clipping. The IP65/IP66 rating handles dust and humidity.