Sungrow SG-CX-P2 Series On-Grid Solar Inverter

Introduction

This document provides essential instructions for the rapid installation of Sungrow's SG-CX-P2 series of three-phase on-grid solar inverters. It is designed for qualified installers to ensure safe and efficient setup of photovoltaic systems. The guide covers models including SG25CX-P2, SG30CX-P2, SG33CX-P2, SG36CX-P2, SG40CX-P2, and SG50CX-P2.

Always refer to the full user manual for comprehensive details and safety information before proceeding with installation.

Important Safety Precautions ⚠️

Safety is paramount during the installation and operation of solar inverters. Please adhere to the following:

• Qualified Personnel: Installation must be performed by trained and certified electricians familiar with electrical systems and solar installations.
• Electrical Hazards: The inverter contains high voltage components. Ensure all power sources (PV arrays and AC grid) are disconnected and locked out before performing any work. Use appropriate personal protective equipment (PPE).
• Grounding: Proper grounding of the inverter and the entire system is critical for safety and protection against electrical faults. Follow local electrical codes and the inverter's specific grounding requirements.
• Ventilation: Install the inverter in a well-ventilated area, away from flammable materials, and within the specified ambient temperature range to prevent overheating.
• Environmental Conditions: Protect the inverter from direct sunlight, rain, and excessive dust. Ensure it is installed in a dry location.
• DC Input: Never connect or disconnect the DC input cables when the inverter is operating or when the PV array is exposed to sunlight, as this can cause arcing and damage.

Package Contents ?

Verify that all components are present and undamaged upon unpacking:

• Sungrow SG-CX-P2 Inverter Unit
• Mounting Bracket
• DC Connector (MC4 type)
• AC Connector
• Grounding Screw
• Quick Installation Guide (this document)
• Warranty Card
• (Optional) Communication accessories

Installation Process ?️

1. Mounting the Inverter

The inverter should be mounted securely on a stable, load-bearing vertical surface, such as a wall. Ensure sufficient clearance around the unit for ventilation and maintenance.

Mounting Location Requirements:

• Orientation: Typically vertical mounting is recommended.
• Clearance: Maintain at least 20 cm (8 inches) clearance above and below, and 15 cm (6 inches) on the sides for airflow.
• Environment: Avoid direct sunlight, high temperatures, and areas prone to moisture or corrosive substances.
• Accessibility: Ensure easy access for inspection and maintenance.

Mounting Procedure:

Attach the provided mounting bracket to the wall using appropriate fasteners (not always included, check local codes and wall type). The inverter typically slides or hooks onto the bracket, securing itself with a locking mechanism. Ensure the bracket is level and firmly attached.

2. Electrical Connections ⚡

All electrical connections must be made with the inverter powered OFF and all external power sources disconnected.

DC Input Connection:

• Connect the positive (+) and negative (-) DC cables from the PV array to the corresponding DC input terminals on the inverter. Use the provided MC4 connectors or equivalent, ensuring correct polarity.
• Verify the DC voltage and current do not exceed the inverter's specifications.

AC Output Connection:

• Connect the AC output cable from the inverter to the AC distribution board or grid connection point. Ensure the correct cable size and type are used according to local regulations and the inverter's power rating.
• Connect the Line (L), Neutral (N), and Ground (PE) wires to the appropriate terminals on the AC connector.

Grounding Connection:

• Connect the grounding terminal on the inverter chassis to the system's main grounding point using a sufficiently sized grounding conductor. This is crucial for safety.

Torque Specifications:

Ensure all terminal screws are tightened to the manufacturer's specified torque values to ensure reliable connections and prevent overheating. Refer to the full manual for exact torque values.

3. Communication Connection (Optional)

If the inverter supports monitoring, connect the communication cables (e.g., RS485, Ethernet) to the designated ports. This allows for remote monitoring and data logging via Sungrow's monitoring platform.

Initial Startup and Commissioning ?

After all connections are verified and secured, the inverter can be commissioned.

1. Check Connections: Double-check all DC, AC, and grounding connections for correctness and tightness.
2. Enable DC Input: Close the DC disconnect switch or apply voltage from the PV array.
3. Check Indicators: Observe the inverter's indicator lights. A green light typically signifies normal operation, while other colors (e.g., red, yellow) indicate faults or specific states. Refer to the manual for indicator light meanings.
4. AC Grid Connection: Once the DC side is stable and the inverter is ready, close the AC breaker to connect the inverter to the grid.
5. System Verification: Monitor the inverter's display or monitoring software to confirm it is generating power and operating within expected parameters.

Key Specifications Summary

The SG-CX-P2 series offers various models with different power capacities. Below is a summary of typical specifications:

Note: Specific values may vary slightly between models and revisions. Always consult the official datasheet for precise specifications.

Troubleshooting Tips ❓

For common issues, consult the full user manual. Basic checks include:

• No Power Output: Verify DC input voltage, AC grid connection, and check for error codes on the display.
• Overheating: Ensure adequate ventilation and check ambient temperature.
• Communication Errors: Check communication cable connections and settings.

For persistent issues, contact Sungrow support or your local distributor.