1. Introduction
The Growatt WIT 8-15K-HU is a state-of-the-art three-phase hybrid solar inverter designed for residential and commercial photovoltaic systems. This inverter efficiently manages power flow from solar panels, battery storage, and the utility grid, ensuring reliable and continuous power supply. It supports advanced features such as UPS functionality, black start capability, and smart load control, making it a versatile solution for various energy needs.
Key features include a maximum string current of up to 20A, a maximum charging/discharging current of 290A, 100% unbalanced output, and 110% continuous AC overloading capacity. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Growatt hybrid inverter.
2. Setup and Installation
Installation of the Growatt WIT 8-15K-HU inverter should only be performed by qualified and certified personnel in accordance with local electrical codes and regulations. Ensure all power sources are disconnected before beginning installation.
2.1 Unpacking and Inspection
Carefully unpack the inverter and all accessories. Inspect for any signs of damage during transit. The package typically includes the inverter unit, communication cables (USB, RS485), and mounting hardware.
2.2 Mounting Location
- Choose a cool, dry, and well-ventilated area.
- Ensure the mounting surface can support the inverter's weight (38kg).
- Maintain adequate clearance around the inverter for proper air circulation (Smart Air Cooling).
- The inverter has an IP66 environmental protection rating, suitable for outdoor installation, but protection from direct sunlight and heavy rain is recommended for longevity.
2.3 Electrical Connections
The inverter integrates with solar panels, a battery pack, the public power grid, and household electric appliances. A typical system diagram is shown below. Detailed wiring instructions are provided in the full installation guide (refer to the official Growatt documentation).
- PV Input Connection: Connect the DC input from your solar panels to the inverter's PV terminals. Ensure correct polarity and voltage within the MPPT range (150V-850V).
- Battery Connection: Connect the battery pack (Lead-acid or Lithium-ion, 40-60V/51.2V) to the designated battery terminals. Ensure BMS communication (RS485/CAN) is properly established for Lithium-ion batteries.
- AC Grid Connection: Connect the inverter to the public power grid (220V/380V, 230V/400V, Three Phase) via appropriate circuit breakers.
- Load Connection: Connect your household or commercial loads to the inverter's AC output terminals.
- Grounding: Ensure the inverter is properly grounded according to local regulations.
Warning: High voltages are present. Only qualified electricians should perform electrical connections.
3. Operating Instructions
Once installed and all connections are verified, the inverter can be powered on.
3.1 Initial Startup
- Ensure all DC and AC breakers are in the OFF position.
- Turn on the DC switch on the inverter.
- Turn on the AC breaker from the grid side.
- Observe the inverter's display (OLED/LED) for startup sequence and status indicators.
- The inverter will perform self-tests and then begin operation, either feeding power to the grid, charging batteries, or supplying loads, depending on the configuration and available power sources.
3.2 Monitoring and Control
The inverter features an OLED/LED display for local monitoring of operational status, power generation, and battery levels. For advanced monitoring and control, use the dedicated mobile application (APP) via WIFI/LAN interfaces. The app provides real-time data, historical performance, and allows for remote configuration and troubleshooting.
3.3 Backup Power Function
In the event of a grid outage, the inverter's UPS function will automatically switch to backup power mode, drawing energy from the battery pack to supply critical loads. The transfer time is approximately 10ms, ensuring minimal disruption.
4. Maintenance
Regular maintenance ensures optimal performance and longevity of your Growatt hybrid inverter.
4.1 Routine Checks
- Visual Inspection: Periodically check the inverter for any visible damage, loose connections, or signs of corrosion.
- Ventilation: Ensure the cooling fins and vents are free from dust and obstructions. The Smart Air Cooling system relies on clear airflow.
- Display Check: Monitor the OLED/LED display and the mobile app for any error messages or unusual readings.
- Cable Integrity: Inspect all DC and AC cables for wear, damage, or overheating.
4.2 Cleaning
Clean the exterior of the inverter with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure the inverter is powered off before cleaning.
4.3 Professional Inspection
It is recommended to have a qualified technician perform a comprehensive inspection and maintenance check at least once a year. This includes checking electrical connections, verifying protection device functionality, and updating firmware if necessary.
5. Troubleshooting
This section provides guidance for common issues. For complex problems, contact technical support.
5.1 Common Issues and Solutions
| Problem | Possible Cause | Solution |
|---|---|---|
| Inverter not powering on | No DC input from PV, DC switch off, battery low, AC grid disconnected. | Check PV connections, ensure DC switch is ON, verify battery charge, check AC grid connection. |
| Low power output | Insufficient sunlight, dirty PV panels, shading, PV string issues. | Check weather conditions, clean PV panels, inspect for shading, verify PV string voltage/current. |
| Error message on display/app | Internal fault, grid fault, battery fault, over-temperature. | Note the error code and consult the full manual or contact technical support. Ensure proper ventilation. |
| No grid connection | AC breaker off, grid outage, grid parameters out of range. | Check AC breaker, confirm grid status, verify grid voltage/frequency. |
5.2 Protection Devices
The inverter is equipped with several protection mechanisms:
- PV reverse polarity protection
- DC switch
- DC/AC surge protection (Type II/Type III)
- Insulation resistance monitoring
- Residual-current monitoring unit
- AC short-circuit protection
- Ground fault monitoring
- Grid monitoring
- Strings monitoring
- Anti-islanding protection
- Optional PID protection and AFCI function
If any of these protections are triggered, the inverter will typically shut down or display an error. Address the underlying cause before attempting to restart.
6. Specifications
The following table details the technical specifications for the Growatt WIT 8-15K-HU series hybrid inverters.
| Datasheet | WIT 8K-HU | WIT 10K-HU | WIT 12K-HU | WIT 15K-HU |
|---|---|---|---|---|
| Input data (PV) | ||||
| Max. recommended PV power (for module STC) | 12800W | 16000W | 19200W | 24000W |
| Max. input voltage | 1000V | |||
| Start voltage | 180V | |||
| Nominal voltage | 600V | |||
| MPPT voltage range | 150V-850V | |||
| Max. input current per MPP tracker | 20A | 40A | ||
| Max. short-circuit current per MPP tracker | 25A | 50A | ||
| No. of PV strings per MPP tracker | 1 | 2/1 | ||
| No. of MPP trackers | 2 | 2 | ||
| Output data (AC) | ||||
| AC nominal power | 8000W | 10000W | 12000W | 15000W |
| Max. AC apparent power | 8800VA | 11000VA | 13200VA | 16500VA |
| Nominal AC voltage/range | 220V/380V, 230V/400V, -15%~+10% | |||
| Nominal AC grid frequency/range | 50/60Hz, 45~55Hz/55-65 Hz | |||
| Max. output current | 13.3A@220V, 12.8A@230V | 16.7A@220V, 15.9A@230V | 20A@220V, 19.1A@230V | 25A@220V, 23.9A@230V |
| Adjustable power factor | -1…+1 | |||
| THDi | <3% | |||
| AC grid connection type | 3P3W+PE/3P4W+PE | |||
| Input data (AC) | ||||
| AC nominal power | 16000W | 20000W | 24000W | 30000W |
| Max. AC apparent power | 17600VA | 22000VA | 26400VA | 33000VA |
| Nominal AC voltage/range | 220V/380V, 230V/400V, -15%~+10% | |||
| Nominal AC grid frequency/range | 50/60Hz, 45~55Hz/55-65 Hz | |||
| Max. input current | 26.6A@220V, 25.5A@230V | 33.3A@220V, 31.9A@230V | 40A@220V, 38.3A@230V | 50.1A@220V, 47.8A@230V |
| Battery data (DC) | ||||
| Battery type | Lead-acid or Lithium-ion | |||
| Battery voltage range/Rated voltage | 40-60V/51.2V | |||
| Max charging and discharging current | 200A | 220A | 250A | 290A |
| BMS communication | RS485/CAN | |||
| Backup power (AC)* | ||||
| Rated AC output power | 8000W | 10000W | 12000W | 15000W |
| Max. AC apparent power | 2 time of rated power, 10s*1 | |||
| Rated AC output voltage | 220V/380V, 230V/400V | |||
| Nominal AC output frequency | 50/60Hz | |||
| Max. output current | 24.2A@220V, 23.2A@230V | 30.3A@220V, 29A@230V | 36.4A@220V, 34.8A@230V | 45.5A@220V, 43.4A@230V |
| THDv | 3% (Linear load) | |||
| Load unbalance | 100% three-phase unbalanced | |||
| On/off grid transfer time | 10ms | |||
| Efficiency | ||||
| Max. efficiency | 97.60% | |||
| European efficiency | 97.00% | |||
| MPPT efficiency | 99.90% | |||
| Protection devices | ||||
| PV reverse polarity protection | Yes | |||
| DC switch | Yes | |||
| DC/AC surge protection | Type II/Type III | |||
| Insulation resistance monitoring | Yes | |||
| Residual-current monitoring unit | Yes | |||
| AC short-circuit protection | Yes | |||
| Ground fault monitoring | Yes | |||
| Grid monitoring | Yes | |||
| Strings monitoring | Yes | |||
| Anti-islanding protection | Yes | |||
| PID protection | Opt | |||
| AFCI function | Opt | |||
| General | ||||
| Dimensions (W / H / D) | 475/698/240mm | |||
| Weight | 38kg | |||
| Operating temperature range | –30°C ... +60°C (> 45°C, derating) | |||
| Noise | ≤50dB(A) | |||
| Relative humidity | 0~100% | |||
| Altitude | 3000m | |||
| Topology | Transformerless | |||
| Cooling | Smart air cooling | |||
| IP degree | IP66 | |||
| Display | OLED/LED+APP | |||
| Interfaces: RS485/USB | Yes | |||
| Interfaces: WIFI/LAN | Yes | |||
| Warranty (5/10 years) | Yes/Opt | |||
| lEC62109, EC 61000, IEC 61727, EC 62116, IEC 61683, IEC 60068, EN 50549, VDE 4105 | ||||
7. User Tips
- Professional Installation: Always ensure installation is carried out by certified professionals to guarantee safety and compliance with electrical standards.
- Monitor Performance: Regularly check the inverter's performance via the mobile app or local display. This helps in early detection of any issues and ensures optimal energy harvesting.
- Battery Compatibility: If using Lithium-ion batteries, ensure proper BMS communication is established for efficient and safe charging/discharging.
- Ventilation: Keep the area around the inverter clear to allow for effective cooling, especially in warmer climates, to prevent derating.
- System Sizing: Ensure your solar panel array and battery bank are appropriately sized for your energy consumption and the inverter's capacity to maximize efficiency and lifespan.
8. Warranty and Support
The Growatt WIT 8-15K-HU series inverters come with a standard 5-year warranty, with an optional extension to 10 years. For warranty claims, technical support, or any inquiries, please contact your installer or the manufacturer directly.
For further assistance, you may contact the seller's support team:
- WhatsApp: +86 13295687202
- Email: sunshinesolar01@163.com
Please provide your product model number and serial number when contacting support to expedite assistance.
