SUKFLOW Grid-Tie Micro Inverter User Manual

1. Introduction and Product Overview

This manual describes the assembly, installation, commissioning, maintenance, and troubleshooting of the SUKFLOW microinverter models NBQ800-EU, NBQ1000-EU, and NBQ1200-EU.

The grid-connected PV inverter system consists of PV modules, microinverters, meters, and the grid. The microinverters convert the DC power generated by the PV modules into AC power that meets the requirements of the grid, and then the AC power is connected to the grid through the meter.

A microinverter is a module-level solar inverter that tracks the maximum power point of each PV module. When one PV module fails or is shaded, the other modules are not affected. The microinverter monitors the current, voltage, and power of each module, enabling module-level data monitoring. Microinverters feature low voltage DC, eliminating the risk of exposing personnel to hazardous high voltage DC. They are easy to install and can be varied according to the number of PV modules. The microinverter housing is designed for outdoor installation and complies with the IP67 protection rating.

Figure 1: SUKFLOW NBQ1200-EU Micro Inverter with key specifications (18A x 2 Max Input Current, 230V Nominal Output Voltage, 5.21A Max Output Current).

2. Safety Guidelines

2.1 Important Safety Instructions

• Before installing, using, or servicing this product, read all documentation carefully.
• All operations must be carried out by trained and qualified personnel.
• Prior to installation, check the packaging and appearance for damage.
• Ensure all cables and plugs are intact and dry before connecting.
• Before installation, ensure solar PV panels and microinverters are disconnected from the home power supply.
• Use personal protective equipment (gloves, goggles) during installation.
• Do not install or operate under extreme weather conditions (lightning, snow, heavy rain, strong winds).
• Warning signs on the equipment must not be damaged or removed.
• After installation, remove any remnants (cut cable ties, torn insulation).
• Do not attempt to repair the microinverter; contact customer support for replacement. Private repair voids warranty.
• Understand grid-connected PV system components and functions; ensure all electrical connections, voltage, and frequency comply with local standards.
• Use extreme caution when the inverter is disconnected from the utility grid, as components may retain charge.
• Ensure the microinverter is mounted securely to prevent falling.
• Use only original or authorized cables; damage from third-party accessories is not the manufacturer's responsibility.

2.2 Environmental Requirements

• Install, operate, or store equipment in a well-ventilated area to prevent permanent damage.
• Avoid strong electrical and magnetic fields to prevent radio interference.
• Do not install in flammable, explosive, corrosive, extremely hot, cold, or humid environments.
• Do not install where children and pets can reach it.

2.3 Description of Symbols

3. Setup and Installation

3.1 Delivery List

• Micro inverter: 1
• Power cord: 1
• User's Manual: 1
• M8 screw combination: 2
• Please contact customer service if any parts are missing.
• Other tools and accessories involved in installation and commissioning are not included in the packing list; please purchase separately if needed.

Figure 2: Microinverter, AC cable, and mounting hardware included in the package.

3.2 Parts and Tools Required for Installation (Not included unless specified)

• M8 screws (2 included)
• M8 nuts (2 included)
• Ties (10 included)
• Screwdriver
• Hexagonal Wrench
• Wrench
• Junction box
• Voltmeter
• Protective Gloves

3.3 Installation Requirements

• Disconnect equipment from the grid and shade or isolate PV modules.
• Ensure environmental conditions (protection class, temperature, humidity, altitude) are met.
• Avoid direct sunlight on the inverter to prevent overheating and power reduction.
• Keep the inverter away from gas or flammable materials.
• Avoid electromagnetic interference.
• Ensure heat sinks (stripes on the back) are more than 20cm away from other objects and well-ventilated.
• For immediate system operation checks, assemble in clear weather.
• We recommend at least three people for assembly or disassembly.

3.4 Installation Steps

1. Planning and Installing the Microinverter:
   • Mark the position of each microinverter on the rails according to the PV module layout.
   • Secure the screws to the rail.
   • Hang the microinverter on the screws and tighten them.

   *The microinverter shall be mounted underneath the PV modules to avoid direct sunlight, rain, snow, UV rays, etc.

   *The AC cable contains the ground wire and can be grounded directly. For areas with special requirements, a grounding bracket is provided. A continuous ground cable is routed through the microinverter grounding bracket and connected to an electrode that meets local regulations to complete the grounding requirements.

   

   Figure 3: Step-by-step installation guide showing mounting, DC connection, and AC connection to a household outlet.

   Using a screwdriver, install the grounding bracket wire to the grounding hole on the top of the microinverter and tighten the screw to 2 N.m.

2. Layout of AC Cables:
   • Determine the number of microinverters and prepare appropriate AC cables.
   • Select appropriate AC cable length, reserving extra length for connecting, trapping, and bending.
   • Lay trunk AC cables on the rails and secure them for microinverter connection.
3. Parallel Microinverters:
   • Align the connector of the trunk AC cable with the AC output port on the right side of the microinverter until you hear a "click".
   • Repeat for all microinverters on the same branch line.
   • Use rolled tape to secure AC cables.

   *The number of microinverters on the same branch line must not exceed the maximum number of connections specified.

4. Connecting the Junction Box:
   • Connect the AC cable from the microinverter AC output port to an outlet or junction box.
   • Wiring for the junction box: L (Line of Fire) Pink, N (zero line) Blue, PE (ground) Green and Yellow.
5. Create Installation Diagram:
   • Peel off the removable label and attach it to the corresponding position of the microinverter.
   • Depending on the microinverter's location in the overall system, attach the appropriate label to the installation diagram.
6. Connecting the PV Module:
   • Install photovoltaic modules.
   • Connect the DC cable from the PV module to the DC input port of the microinverter.

   *The DC cable of one PV module must be connected to the DC input port on the same side of the microinverter.

   *The power of the PV module should meet the input requirements of the microinverter; refer to the data sheet.

   

   Figure 4: Detailed view of microinverter connections, including DC inputs and AC output.

7. Powering Up the System:
   • Turn on the AC circuit breaker for the branch circuit.
   • Turn on the house's main AC circuit breaker. The system will begin generating power in approximately two minutes.

4. Operating and Monitoring (APP)

The microinverters are connected to the Internet through a broadband router. After following the operating instructions to connect to the system platform, the platform will display current and historical performance trends and inform the status of the PV system in real time.

4.1 Download APP

The app allows you to remotely monitor and adjust the microinverter. Search for "Smart Life" in the Apple App Store and other major app stores, or scan the QR code below to download the "Smart Life" APP.

Figure 5: Scan QR code or use app store links to download the Smart Life app for monitoring.

4.2 Register for an Account

1. Click "Sign Up" to read and agree to the User Agreement and Privacy Policy, then proceed to the Register page.
2. Register an account using an email address or cell phone number. The State/Region is specified automatically but can be changed manually. Click "Get Verification Code".
3. Enter the received verification code, then set your password.

4.3 Connecting the Microinverter to the APP

1. Within 3 minutes of power-up, plug and unplug the AC three times within 20 seconds to start the distribution mode.
2. Open the Smart Life APP. The "Microinverter Add" button will automatically pop up; click it to start connecting. If it doesn't pop up, manually click "Add Device" to search for nearby devices and enter distribution mode.
3. Follow the prompts to enter the Wi-Fi account and password, then click "Next".

4.4 APP Interface and Monitoring

The app interface provides real-time data and remote management capabilities. You can set up the output power, remotely switch the inverter on/off, and view input/output voltage, current, power, and inverter temperature. It records real-time and historical power generation.

• Generated and historical data: View total return to date and total charge to date.
• Cumulative power generation and savings: Track energy production over time.
• Abnormal Alarms: Receive notifications for system issues.
• Solar Panel Operating Data: Monitor individual panel performance.
• Microinverter Operating Data: Check inverter status and temperature.
• Grid data: View grid-related information.

Figure 6: Smart Life App interface showing statistics, power generation, and device information.

Click "Details" to view generated and historical data. Use the "Setup" button in the upper right corner to access the Rate Setup screen to set the currency and unit price of electricity.

5. Maintenance

Regular maintenance ensures optimal performance and longevity of your microinverter. Keep the unit clean and ensure all connections are secure. Periodically check for any visible damage to cables or the inverter housing.

5.1 Replacing the Microinverter

*The inverter must be replaced by a trained professional.

*The DC operating voltage range of the photovoltaic module must match the allowable input voltage range of the microinverter.

1. Turn off the branch circuit breaker and disconnect AC power.
2. Disconnect the AC connector from the microinverter.
3. Cover the PV module with an opaque cover to ensure no current in the wires between the PV module and the microinverter.
4. Disconnect the PV module connector from the microinverter.
5. Remove the microinverter from the PV mount.
6. Mount the new microinverter to the PV mount.
7. Remove the shade cover from the PV module.
8. Connect the PV module connector on the microinverter.
9. Connect the AC cable on the microinverter to verify that the microinverter is working properly.

6. Troubleshooting

6.1 LED Status Indication

7. Specifications

Figure 7: Component diagram showing AC connector, grounding hole, screw fixing hole, antenna, DC connector, and LED indicator light.

Figure 8: Diagram illustrating multiple combination connections for the solar PV grid tie micro inverter, feeding into a residential grid and monitored via Android/iPhone app.

Figure 9: The microinverter shown with included mounting bolts, washers, nuts, 5m AC cable, and a representation of the monitoring app.

8. Wiring Diagram

Figure 10: Detailed wiring diagram showing connections from solar panels to microinverters, then to the AC bus cable and household grid. Includes 2.4G antenna and mounting points.

Figure 11: System diagram illustrating the connection of solar panels to microinverters, distribution box, grid, and integration with a router for WiFi monitoring.

9. Warranty and Support

The SUKFLOW NBQ1200-EU Micro Inverter comes with a 3-year warranty. We are committed to providing reliable products and support.

The product meets various certifications including EN 50549, VDE 4105, IEC 62321, CE, RoHS, WEEE, VDE-AR-4105, EN62109-1/2, EN61000-6-2/4, EN61000-3-2/3, EN62920, Ordinanace NO.140, IEC62321, and FCC, ensuring high standards of safety and performance.

If you have any questions regarding installation, operation, or product issues, please contact our customer support. We aim to respond within 24 hours.

10. User Tips

• Optimal Placement: Ensure the microinverter is mounted in a well-ventilated area, preferably underneath the PV modules, to protect it from direct sunlight and harsh weather, which helps maintain optimal operating temperature and efficiency.
• Secure Connections: Double-check all DC and AC connections during installation to prevent loose contacts, which can lead to power loss or safety hazards. The "click" sound for AC connectors indicates a secure fit.
• App Monitoring: Regularly use the Smart Life app to monitor your system's performance. This allows you to track energy generation, identify any anomalies quickly, and ensure your system is operating at peak efficiency.
• Grounding is Crucial: Always ensure proper grounding as specified in the manual, especially if local regulations require a separate grounding bracket. This is vital for safety and system protection.
• Professional Assistance: For any complex issues or replacement procedures, always consult with a trained professional to avoid voiding your warranty or causing damage.