Y&H Solar Grid Tie Micro Inverter (SG Series) Instruction Manual

1. Introduction

This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Y&H Solar Grid Tie Micro Inverter. Please read this manual thoroughly before installation and keep it for future reference. The Y&H Micro Inverter is designed to convert direct current (DC) from solar photovoltaic (PV) modules into alternating current (AC) for grid-tied applications.

2. Safety Information

WARNING! Read the user manual before operating this equipment. Failure to do so can result in serious injury, property damage, and/or electrical shock.

Use professional personnel ONLY to connect to the equipment.
Do NOT exceed PV panel(s) power over the inverter max input power.
Do NOT exceed PV panel(s) open circuit voltage over the inverter max input voltage.
DC voltage sources in PV array are exposed to light, it implies DC voltage to the equipment.
Do NOT remove the AC cap. Servicing must be performed by qualified service personnel.
Do NOT connect other items to the equipment. Each circuit must be individually disconnected before servicing.
Do NOT cover other items on the equipment.
Install away from direct sunlight and direct rain exposure.

Y&H Smart Inverter with warning label — Front view of the Smart Inverter with important warning labels.

3. Product Features

Single unit connects to one PV module.
Maximum AC output power: 600W/700W/800W/1000W depending on model.
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.
Dual-chip inverter design for independent function and output control, offering faster control speed and higher efficiency (for SG-600W/SG-700W upgraded models).

4. Specifications

4.1. Product Series Specifications

Model	SG600MS	SG600MD	SG700MD	SG800MD	SG1000MD
Input Data (DC, PV)
Input MC4 Number of connectors	1 set	2 set
MPPT Voltage Range	28V-55V
Operation Voltage Range	20V-60V
Maximum Input Voltage	60V
Startup Voltage	20V
Max Input Power	1*600	2*300	2*350	2*400	2*500
Max Input Current	20A	2*10A	2*11.66A	2*13.33A	2*16.66A
Output Data (AC)
Single-Phase Grid Type	120/230 Auto
Rated Output Power	590W	590W	650W	760W	950W
Max Output Power	600W	600W	700W	800W	1000W
Nominal Output Current	120V/4.9A	120V/4.9A	120V/5.4A	120V/6.3A	120V/7.9A
Nominal Output Current	230V/2.6A	230V/2.6A	230V/2.8A	230V/3.3A	230V/4.1A
Output Frequency	50Hz/60Hz
Power Factor	>0.99
Max Units per Branch	120V/4 units	120V/4 units	120V/4 units	120V/3 units	120V/2 units
Max Units per Branch	230V/8 units	230V/8 units	230V/7 units	230V/6 units	230V/4 units
Efficiency
Peak Efficiency	95%
CEC Weighted Efficiency	@120VAC:92.5%/@230VAC:93.5%
Nominal MPPT Efficiency	99%
Night Power Consumption	<700mW

4.2. Mechanical Data

Parameter	Value
Operating Ambient Temperature Range	(-40°C to +65°C)
Storage Temperature Range	(-40°C to +85°C)
Max Current of AC Bus Cable	20A
Waterproof Grade	IP65
Communications	Wifi
Transformer Design	High Frequency Transformers, Galvanically Isolated
Protection Functions	Isolated Island Protection, Voltage Protection, Frequency Protection, Temperature Protection, Current Protection, etc.
Dimensions (W x H x D)	185mm x 180mm x 38.5mm (not including connectors and cable)
Weight	1.5 KG

5. Installation

Proper installation is crucial for the performance and longevity of your micro inverter. Follow these steps carefully:

5.1. General Installation Guidelines

Avoid Direct Sunlight: Install the inverter in a location that avoids direct sunlight to prevent excessive temperatures.
Avoid Rain/Moisture: Ensure the installation prevents rain or other liquids from wetting or soaking the inverter. While rated IP65, prolonged direct exposure to harsh weather is not recommended.
Ensure Ventilation: The inverter requires a well-ventilated environment to facilitate proper heat dissipation.

Inverter installed on a house, showing IP65 rating and rain protection — The inverter is IP65 waterproof and dustproof, suitable for outdoor installation, but direct sunlight and rain are not recommended.

5.2. Connection Steps

Install the Inverter: Mount the inverter on the bottom of the solar panel. Ensure the location is well-ventilated and dry.
Connect DC Input: Connect the positive and negative DC terminals from the PV module(s) to the corresponding positive and negative inputs on the inverter. Each MC4 branch cannot exceed 300W. Ensure Vmp > 28V and Voc < 50V for each PV module.
Connect AC Output: Connect the AC output cable from the inverter to the household outlet. Ensure the household outlet switch is turned on.

Installation Step 1: Inverter on solar panel, cool environment — Step 1: Install the inverter on the bottom of the solar panel. Note that it must be ventilated and dry, in a cool environment.

Installation Step 2: DC connection to PV, positive to positive, negative to negative — Step 2: Connect the two DC terminals of the PV to the inverter, positive to positive, negative to negative MC4 Connector. Compatible with 2pcs 250W-300W Solar Panel. Each MC4 branch cannot exceed 300W. Vmp > 28V, Voc < 50V.

Installation Step 3: AC output to household outlet, switch on — Step 3: Connect the AC output cable to the household outlet. The household outlet switch must be turned on.

5.3. Wiring Diagrams

Refer to the following diagrams for specific grid configurations:

Wiring diagram for Single-Phase 230V grid, showing up to 8 units SG600 per branch — SG600 Series Microinverter @ Single-Phase 230V grid. Maximum 8 units SG600 Microinverters per branch. Max DC input power of each inverter is 600W (PV module max output power is 2*300W). VOC of PV modules should not be greater than the max DC input voltage of Microinverters.

Wiring diagram for Single-Phase 120V grid, showing up to 4 units SG600 per branch — SG600 Series Microinverter @ Single-Phase 120V grid. Maximum 4 units SG600 Microinverters per branch. Max DC input power of each inverter is 600W (PV module max output power is 2*300W). VOC of PV modules should not be greater than the max DC input voltage of Microinverters.

Detailed wiring diagram for Single-Phase 120V grid connection — Wiring diagram for Single-Phase 120V grid connection. Micro Inverter Voltage: 120/230VAC, Grid Voltage: 120V, Grid Type: Single Phase. AC BUS CABLE: P1.BROWN - L, P3.BLUE - N, P2.GREEN&YELLOW - G.

Detailed wiring diagram for Single-Phase 230V grid connection — Wiring diagram for Single-Phase 230V grid connection. Micro Inverter Voltage: 120/230VAC, Grid Voltage: 230V, Grid Type: Single Phase. AC BUS CABLE: P1.BROWN - L, P3.BLUE - N, P2.GREEN&YELLOW - G.

Detailed wiring diagram for 3-Phase 208/240V (Single-Phase 120V) grid connection — Wiring diagram for 3-Phase 208/240V (Single-Phase 120V) grid connection. Micro Inverter Voltage: 120/230VAC, Grid Voltage: 208/240V, Grid Type: Triple Phase. AC BUS CABLE: P1.BROWN - L, P3.BLUE - N, P2.GREEN&YELLOW - G.

Detailed wiring diagram for 3-Phase 380V (Single-Phase 230V) grid connection — Wiring diagram for 3-Phase 380V (Single-Phase 230V) grid connection. Micro Inverter Voltage: 120/230VAC, Grid Voltage: 380V, Grid Type: Triple Phase. AC BUS CABLE: P1.BROWN - L, P3.BLUE - N, P2.GREEN&YELLOW - G.

5.4. AC Cable Description

Length: 2m.
An AC power cord can only be used for 1PCS inverter.
If multiple inverters are connected in parallel, a circuit breaker must be used. Connect to the grid in accordance with L (Live), N (Neutral), G (Ground).
This cable is suitable for SG series 300W-700W inverters.
This cable is NOT suitable for SG series 800W and 1000W inverters.

AC cable connection methods — AC Bus Cable connection methods. Method 3 is recommended.

6. Operation

Once properly installed and connected, the inverter will automatically begin operation when sufficient DC power is supplied from the PV modules and the AC grid connection is active. The green LED indicator on the inverter will blink and then light up steadily to indicate normal operation.

6.1. Monitoring

The Y&H Micro Inverter features 2.4G wireless communication for monitoring. You can monitor your system's performance via a dedicated mobile application (Android/iPhone) by connecting the inverter to a wireless router.

Diagram showing 2nd-generation upgraded Inverter with WiFi monitoring via app — The 2nd-generation upgraded inverter supports WiFi connectivity for monitoring via Android/iPhone applications.

6.2. Performance Comparison

Y&H Microinverters offer optimal performance for every module, adapting to varying conditions throughout the day, unlike traditional string inverters where one under-performing module can affect the entire system.

Comparison of Y&H Microinverter vs. Traditional String Inverter performance under shading — Comparison illustrating how Y&H Microinverters maintain optimal performance per module even with shading, unlike traditional string inverters.

7. Maintenance

The Y&H Micro Inverter is designed for durability and minimal maintenance. However, regular checks and proper environmental conditions are important:

Environmental Conditions: Ensure the inverter remains in a ventilated, dry, and cool location. Avoid direct sunlight and rain exposure.
Cleaning: Periodically clean the exterior of the inverter to prevent dust buildup, which can affect heat dissipation. Use a soft, dry cloth. Do not use liquids or abrasive cleaners.
Cable Integrity: Regularly inspect all cables and connections for any signs of wear, damage, or loose connections.

Inverter in rain, with text 'Please do not install outdoors, avoid rain.' — It is crucial to avoid installing the inverter outdoors in direct rain. Install in a ventilated, dry, cool place.

8. Troubleshooting

If your inverter is not operating as expected, consider the following common issues:

Inverter Not Working (No Output): A common issue is damage to the DC or AC fuse. If you encounter this, contact support for free replacement parts and maintenance video instructions.
Over-Temperature Protection: The inverter uses an aluminum alloy casing for heat dissipation and has built-in over-temperature protection. If the temperature becomes too high, the inverter will automatically reduce output efficiency or stop working. It will restart once cooled down. Ensure the inverter is installed in a well-ventilated, cool environment.
No Green LED Indicator: If the green LED indicator does not light up or blink, check all connections (DC and AC) to ensure they are secure and that the household outlet switch is on. Verify that the solar panels are receiving sufficient sunlight.

Inverter with temperature gauge, showing over-temperature protection — The micro-inverter has over-temperature protection. High temperature will stop working. It operates normally between -20°C and 50°C.

9. User Tips

220V Connection: The inverter is designed to auto-match 120V/230V AC output. Ensure your grid connection matches the inverter's output voltage for optimal performance. Refer to the wiring diagrams for 120V and 230V single-phase and three-phase setups.
Smart Home Integration: The inverter's 2.4G WiFi communication allows for monitoring via a mobile app, which can be integrated into your smart home setup for remote performance tracking.
Fuse Replacement: If the inverter stops working due to a damaged DC or AC fuse, replacement parts and guidance are available from Y&H technical support. This is a common and easily repairable issue.

10. Warranty and Support

Y&H offers an after-sales guarantee for its products. If you encounter any product faults, Y&H will help determine the cause, provide free replacement parts, or replace the product as necessary. For any issues or technical assistance, please contact Y&H technical support.

After-sales guarantee diagram showing fault determination, free parts, replacement, and technical support — Y&H After-Sales Guarantee Process: Determine the cause of product faults, provide free replacement parts, replace the product, and contact Y&H technical support.

10.1. Installation and Testing Video

This video demonstrates the basic wiring and testing process for the Y&H Smart Inverter, including connecting positive and negative terminals and observing the green LED indicator.

Y&H SG Series Micro Inverter