GoodWe STS Series Static Transfer Switch

Important Information and Safety Precautions

The information in this quick installation guide is subject to change due to product updates or other reasons. This guide cannot replace the product labels or the safety precautions in the user manual unless otherwise specified. All descriptions here are for guidance only.

All operations should be performed by trained and knowledgeable technicians who are familiar with local standards and safety regulations.

Strictly follow the installation, operation, and configuration instructions in this guide and user manual. The manufacturer shall not be liable for equipment damage or personal injury if you do not follow the instructions.

Installation Procedure

Mounting Requirements

The unit requires secure mounting. Ensure the following clearances are maintained: a minimum of 250mm above, 100mm below, and 100mm on the sides. The unit should be mounted with a tilt angle not exceeding 15 degrees. The weight of the unit is 16.5kg. The mounting dimensions are approximately 425mm in height, with specific widths and depths indicated for mounting points and the unit itself (e.g., 156mm, 147mm, 110mm). Cable entry points are designed for specific conduit diameters, such as 18-38mm and 32-38mm.

AC Wiring

Connect the AC power sources and loads to the appropriate terminals. For Inverter and Generator inputs, use copper cables sized 20-25mm². For Backup Load & Grid connections, cable sizing depends on the current:

• For currents less than 90A: Use copper cables sized 20-25mm².
• For currents between 90A and 150A: Use copper cables sized 20-50mm².
• For currents between 150A and 200A: Use copper cables sized 50-70mm².

DC and Control Wiring

Connect DC power and control signals between the Inverter and the STS unit. Use copper cables sized 10-16mm² for DC connections. Terminal M5 connections require a torque of 1.2-2 N·m. The communication interface utilizes specific pins for data transfer.

Grounding

Connect the protective earth (PE) terminal using copper cable sized 10-16mm². Ensure the M5 terminal is securely tightened to a torque of 1.5-2 N·m.

Power Sequence

The power-on and power-off sequence is critical for safe operation. Follow the indicated sequence: 1 → 2 → 3 → 4 → 5.

Communication Interface

The STS unit communicates with the Inverter via a dedicated interface. Key pins include:

• +12_S: Positive voltage signal
• GND_S: Signal ground
• STS_TX: STS transmit data
• RS485_A1: RS485 communication line A
• RS485_B1: RS485 communication line B

Commissioning and Monitoring

After installation, the unit requires commissioning and can be monitored for operational status. Refer to the user manual for detailed procedures on setup and monitoring.

Product References

This guide is a supplement to the official STS Series User Manual. The unit is compatible with Commercial Smart Inverter Solutions, such as the ET 40-50kW+Lynx C system.