Growatt 15kW WIT Series Three-Phase Hybrid Inverter (WIT 15K-HU)

Product Overview: The Growatt WIT 15K-HU is a commercial-grade, highly sophisticated three-phase hybrid solar inverter engineered to anchor premium residential microgrids and light commercial energy ecosystems. Designed to interface seamlessly with high-voltage lithium battery architectures, this 100% unbalanced-load capable 15kW powerhouse bridges dynamic utility grid synchronization with uncompromising, heavy-duty off-grid backup resilience. Driven by integrated advanced EMS logic, multiple MPPT trackers, and flexible multi-source management, the WIT 15K-HU stands as the definitive, future-proof asset for modern microgrids requiring continuous, zero-downtime performance.

PV String Input Data (DC Side)

Optimized for high-power modules with an expanded string current limit up to 20A per input line.

• Max. Recommended PV Power: 24,000 W (24 kW) (Enables a robust 1.6x DC overloading ratio)

• Max. DC Input Voltage: 1000 V

• Start-up Voltage: 180 V

• Nominal DC Voltage: 600 V

• MPPT Operating Voltage Range: 150 V ~ 850 V

• Number of MPPT Trackers: 2

• Number of Strings per MPPT: 2 / 1

• Max. Input Current per MPPT (Imax): 40 A (Supports modern high-power 182mm/210mm ultra-high-current modules at 20A per string)

• Max. Short Circuit Current per MPPT (Isc): 50 A

 Battery Interface

Features a low-voltage battery architecture supporting up to 290A of massive charge/discharge current throughput for fast cycling.

• Compatible Battery Type: Lithium-ion (LiFePO4) / Lead-acid

• Nominal Battery Voltage: 51.2 V

• Battery Voltage Range: 40 V ~ 60 V (Safe low-voltage system with ultra-high current capability)

• Max. Continuous Charging Current: 290 A

• Max. Continuous Discharging Current: 290 A

• BMS Communication Ports: CAN / RS485 (Closed-loop communication with major low-voltage storage batteries)

AC Output/Input Data (On-Grid)

 AC Output Data (Back-up / EPS Mode)

• Back-up Rated Power: 15,000 W (15 kW)

• Max. Back-up Apparent Power: 15,000 VA

• Peak Apparent Power: 30,000 VA (10 Seconds duration) (2x rated transient peak capacity to effortlessly handle high-surge inductive loads like HVAC systems, pumps, or motors)

• Max. Output Current on Backup: 45.5 A (@220V) / 43.4 A (@230V)

• Automatic Switchover Time: < 10 ms (UPS-level seamless backup transfer to guarantee continuous operation for critical server and network setups)

• Black Start Capability: Supported (Allows system restart directly via PV/Battery during a complete blackout)

• Nominal Output Voltage / Freq: 220V/380V, 230V/400V (± 2%) | 50 Hz/60 Hz (± 0.2%)

Efficiency & Protection Framework

• Max. Efficiency: 97.6%

• European Efficiency: 97.0%

• MPPT Tracking Efficiency: 99.9%

• Integrated Safety Protections: Anti-islanding Protection (ENS), Output Short Circuit Protection, Residual Current Monitoring Unit (RCMU), DC Reverse Polarity Protection, Ground Fault Monitoring, Grid Telemetry Monitoring, and Output Overvoltage Protection.

• Surge Protection: Integrated Type II DC Surge Protection and Type II AC Surge Protection for robust localized atmospheric immunity.

• Smart Safety Feature: High-precision string monitoring; optional integrated AFCI Protection (Arc Fault Circuit Interrupter).

 General & Mechanical Specifications

• Dimensions (W × H × D): 475 × 698 × 240 mm

• Net Weight: 38.0 kg

• Cooling Concept: Intelligent forced-air cooling (Temperature-controlled variable-speed fan routing)

• Ingress Protection Rating: IP66 (Superior industrial dustproof and waterproof build rating, engineered for uncompromised indoor and harsh outdoor installations)

• Operating Temperature Range: -30°C to +60°C (Smart power derating applies at high temperatures)

• Relative Humidity: 0% ~ 100% (Non-condensing)

• Max. Operating Altitude: 3,000 m

• System Integration: Supports both DC-coupled and AC-coupled system layouts; features an integrated smart Generator interface.

• Parallel Capability: Scalable up to 6 units in parallel, expanding system capacity up to 90kW.

• Communication Options: RS485, USB, WLAN/Wi-Fi (Supports telemetry routing and remote parameter adjustments via Modbus-TCP and the Shine app ecosystem).

• 3-Phase Phase-Level Unbalanced Load Sharing

  • 100% Three-Phase Unbalanced Output: Supports up to 100% unbalanced load capacity on each individual phase, allowing highly flexible and stable power distribution when handling diverse single-phase and three-phase domestic or light commercial appliances.

  • High-Voltage Battery Efficiency: Engineered for high-voltage battery systems to maximize system-level round-trip efficiency, drastically reducing thermal losses compared to traditional low-voltage high-current alternatives.

  • Massive DC/AC Oversizing: Allows substantial PV string oversizing to ensure optimal battery charging and peak continuous loads are covered even under low-irradiation or adverse winter weather conditions.

• ⚡ Grid Resilience & Ultimate Multi-Source Microgrid Control

  • True UPS-Class Switching (<10ms): Features an ultra-fast emergency power supply (EPS) transition time of under 10 milliseconds, guaranteeing zero reset or interruption for sensitive IT servers, security infrastructure, and home automation systems during grid failures.

  • Generator Automation & Dry Contacts: Outfitted with robust built-in dry contact controls to seamlessly orchestrate local diesel, petrol, or gas backup generators, creating an autonomous local grid safety net during prolonged grid outages.

  • AC-Coupling & Retrofit Friendly: Built to easily integrate via AC-coupling with existing standard on-grid solar string inverters, upgrading legacy photovoltaic plants into flexible, dynamic energy storage stations without replacing older hardware.

• 🛡️ Industrial Reliability & Smarter Operations

  • Heavy-Duty IP66 Structural Protection: Upgraded to a ruggedized, weather-sealed IP66-rated casing, safeguarding delicate power electronics against heavy monsoon driving rain, fine dust, and corrosive humid environments.

  • Smart Active Cooling & Thermal Intelligence: Utilizes redundant, intelligent cooling fan systems to maintain optimal internal operating temperatures, ensuring no power derating even under continuous full-load environments in high-ambient climates.

  • AI-Enhanced ShineServer O&M Ecosystem: Fully integrated into Growatt’s global ShineServer and ShinePhone App infrastructure, granting installers the leverage to execute remote parameter tuning, complete OTA firmware updates, and perform precise string-level curve diagnostics.