Y&H 600W/700W Smart Grid Tie Micro Solar Inverter User Manual

1. Product Overview

The Y&H Smart Grid Tie Micro Solar Inverter is designed for converting DC power from solar panels into AC power for direct use or feeding into the utility grid. It features an IP65 waterproof streamline design, high-performance Maximum Power Point Tracking (MPPT), and Autolock Maximum Power Point (APL) for optimal energy harvesting.

This microinverter is suitable for installation in a ventilated, dry, and cool environment. Avoid direct sunlight and rain exposure.

2. Key Features

• Single unit connects to one PV module.
• Maximum 600W (SG600MD) or 700W (SG700MD) AC output power.
• Single-phase output, compatible with flexible 3-phase PV systems.
• 2.4G wireless communication and monitoring capabilities.
• Supports up to 8 units (230V) per branch.
• Customizable input (DC, PV) voltage range.
• Integrated AC bus cable for ready-to-use installation.
• Low cost and easy installation.

3. Safety Warnings and Precautions

WARNING! DANGER!

• Read the user manual thoroughly before operating this equipment. Failure to do so can result in serious injury, property damage, and/or electrical shock.
• Use photovoltaic panel(s) ONLY to connect to this equipment.
• This equipment is an ON-GRID Microinverter. For proper operation, it must be connected to the power grid correctly, and the power grid must be working properly. If the power grid stops working, the inverter will also stop generating.
• Do NOT exceed the PV panel(s) voltage over the inverter's maximum input voltage.
• Do NOT exceed the PV panel(s) power over the inverter's maximum input power.
• DC voltage sources are passed through this equipment. Each circuit must be individually disconnected before servicing.
• Do NOT cover other items on this equipment.
• Do NOT remove the lid. Servicing must be performed by qualified service personnel.
• When the PV array is exposed to light, it supplies DC voltage to this equipment.
• Install away from direct sunlight and direct rain exposure.

4. Setup and Installation

Important: Prior to installation, verify that the utility voltage at the point of common grid connection matches the voltage rating on the Microinverter label.

4.1. Choosing the Proper Installation Position

The Solar Micro-Inverter is a precise electronic equipment. To ensure long-term stable operation, install it according to standards:

• Avoid sunlight: Prevent direct sunlight to avoid excessive temperatures.
• Avoid rain: Protect the inverter from rain or other liquids.
• Keep ventilation: Install in a well-ventilated environment for heat dissipation.

Install the Micro-Inverter on the support beam of the PV module racking, utilizing the PV modules as a cover to shield from sunlight and rain. Ensure sufficient space for heat radiation. Damage due to improper installation position (e.g., water seepage) will exclude it from warranty.

4.2. Installation Steps

1. Install the inverter: Mount the inverter on the bottom of the solar panel. Ensure it is ventilated and dry.
2. Connect DC terminals: Connect the two DC terminals of the PV module to the inverter. Ensure positive to positive and negative to negative MC4 connectors. Each MC4 branch cannot exceed 300W (for 600W model) or 350W (for 700W model). Vmp > 28V, Voc ≤ 50V.
3. Connect AC output cable: Connect the AC output cable to the household outlet. The household outlet switch must be turned on.
4. Tighten Bus Cable End Cap: Secure the Bus Cable End Cap at the end of the AC bus cable.
5. Install AC Branch Circuit Junction Box: Wire the conductors of the AC bus cable (L-BROWN, N-BLUE, G-GREEN&YELLOW). Connect the AC branch circuit junction box to the point of utility-grid interconnection.
6. Verify Connections: Double-check that all Microinverters, connectors, and cables are correctly and securely connected.
7. Turn ON AC Circuit Breaker: Turn on the AC circuit breaker on each AC branch circuit of the Microinverter.
8. Turn ON Main AC Circuit Breaker: Turn on the main AC circuit breaker of the utility grid. Your system will start producing power after a 30-second safety delay period.

4.3. Wiring Schematics

Below are various wiring diagrams for different grid types and phases. Ensure you select the correct diagram for your installation.

Single-Phase 120V Grid

Single-Phase 230V Grid

2-Phase 208/240V (Single-Phase 120V) Grid

3-Phase 208/240V (Single-Phase 120V) Grid (Type I & II)

3-Phase 380V (Single-Phase 230V) Grid

4.4. AC Bus Cable and Connectors

5. Operating Instructions

5.1. LED Display

• Green light steady: Microinverter is generating power.
• Red flash: Microinverter is waiting.
• Red light steady: Indicates a fault condition.

5.2. Fault Conditions (Red Light Steady)

• Island protection
• Over-temperature protection
• Over/low AC voltage protection
• Over/low DC voltage protection
• Over/low AC frequency protection
• General fault

5.3. WiFi Monitoring

The second-generation SG micro-inverter includes a mobile phone communication function, allowing you to monitor the working status of your inverter anytime and anywhere via a dedicated app.

Video demonstrating the basic connection and testing of the inverter, including app connection steps.

6. Specifications

** Specifications subject to change without notice **

7. Maintenance

The Y&H Smart Grid Tie Micro Solar Inverter is designed for durability and minimal maintenance. However, regular checks can ensure optimal performance and longevity.

• Visual Inspection: Periodically inspect the inverter and all connections for any signs of damage, corrosion, or loose wiring.
• Ventilation: Ensure the installation area remains well-ventilated and free from obstructions to prevent overheating.
• Cleaning: Keep the inverter's exterior clean from dust and debris. Use a soft, dry cloth for cleaning. Do not use harsh chemicals or abrasive materials.
• Temperature Monitoring: The micro-inverter has over-temperature protection. If high temperatures are detected, it will stop working to prevent damage. Ensure the operating ambient temperature range of -40°C to +65°C is maintained.

8. Troubleshooting

If the inverter is not operating as expected, refer to the LED display for indicators of potential issues:

• Red light steady: This indicates a fault. Common faults include:
  • Island protection activation
  • Over-temperature protection
  • Over/low AC voltage protection
  • Over/low DC voltage protection
  • Over/low AC frequency protection
  • General internal fault
• No Power Output: Check all DC and AC connections. Ensure solar panels are receiving adequate sunlight and producing sufficient voltage. Verify that the utility grid is active.
• Intermittent Operation: Check for loose connections or environmental factors like shading or extreme temperatures affecting panel performance.

If troubleshooting steps do not resolve the issue, contact qualified service personnel.

9. User Tips

• Optimal Panel Placement: Position solar panels to minimize shading throughout the day for consistent power generation.
• Regular Monitoring: Utilize the WiFi monitoring app to regularly check your inverter's performance and identify any anomalies early.
• Cable Management: Ensure all cables are securely fastened and protected from environmental damage to prevent wear and tear.
• System Expansion: When expanding your solar system, adhere to the maximum unit limits per branch for your specific grid type (e.g., 4 units for 120VAC, 8 units for 230VAC for SG600MD).

10. Warranty and Support

For any product faults or issues, Y&H offers after-sales support. This includes determining the cause of product faults, providing free replacement parts, and product replacement if necessary.

For detailed warranty terms and conditions, please refer to the official product documentation or contact Y&H customer service.

A user manual in PDF format is available for download: User Manual (PDF)