Sofar Solar HYD Hybrid Inverter and Battery Setup Guide

Key Takeaways

• Sofar HYD series hybrid inverters offer versatile energy management, supporting grid-tied, off-grid, and time-of-use energy storage operations.
• These inverters are designed to support modular lithium storage systems, requiring dedicated CAN-bus or RS485 communication for battery management.
• Essential circuits for uninterruptible power supply (UPS) must be connected to the inverter's dedicated AC-out-1 terminal.
• Initial commissioning, operating parameter adjustments, and cloud monitoring are primarily managed through the Solarman app, but an accredited installer is required for safe and compliant grid connection.

Understanding Your Sofar HYD Hybrid Inverter

The Sofar HYD series hybrid inverters, including single-phase models (Sofar HYD 3000-6000-ES) and three-phase models (Sofar HYD 5K-20KTL-3PH), are designed for comprehensive energy management. These inverters support grid-tied, off-grid, and time-of-use energy storage operations, making them suitable for various residential and commercial applications worldwide. They are engineered for both residential and commercial off-grid and grid-parallel energy storage systems worldwide.

Sofar HYD inverters are compatible with standard single-phase and three-phase electrical distribution systems globally. This flexibility allows them to integrate into diverse existing electrical infrastructures. The architecture ensures that your solar power system can store excess energy, provide backup power, and optimise energy consumption based on grid conditions or time-of-use tariffs.

Connecting Your Battery System

Proper battery connection is critical for the safe and efficient operation of your Sofar HYD hybrid inverter. The inverters support modular lithium storage systems, which communicate with the inverter via dedicated CAN-bus and RS485 communication interfaces. This communication allows the inverter to manage the battery's charge and discharge cycles effectively, ensuring longevity and performance.

To connect your battery system, you must connect the battery BMS communication lead to the dedicated CAN port on the inverter communication board. This ensures that the inverter and the battery management system (BMS) can exchange vital operational data. Always refer to the specific battery manufacturer's instructions for their communication lead and pinout details, as these can vary.

For safety, it is essential to bond the inverter chassis ground and the battery metal enclosure to the main installation earthing terminal. This protective earthing prevents electrical hazards and ensures the system operates within safety standards.

Setting Up Emergency Power Supply (EPS)

The Sofar HYD series inverters feature a dedicated Emergency Power Supply (EPS) output, designed to provide uninterruptible power to essential circuits during a grid outage. This functionality is crucial for maintaining power to critical loads such as lighting, refrigeration, or communication systems when the main grid supply is unavailable.

To utilise this feature, you must connect essential circuits to the dedicated AC-out-1 terminal on the inverter for uninterruptible power supply. This terminal is specifically designed for backup loads and will receive power from the battery system when the grid is down. For three-phase installations, Sofar HYD three-phase inverters support unbalanced three-phase backup output up to 100% per phase on essential load circuits. This means that even if your essential loads are not evenly distributed across the three phases, the inverter can still provide full backup power to each phase up to its rated capacity.

Commissioning with the Solarman App

The Sofar HYD inverter offers flexible commissioning options, primarily through the Solarman Smart App and the Sofar Inverter LCD Interface. The Solarman app is the recommended tool for comprehensive setup and monitoring. Commissioning, operating parameters, and cloud monitoring are configured via the Solarman app, providing a user-friendly interface for managing your system.

Through the Solarman app, you can:

1. Configure Operating Parameters: Adjust settings such as charge/discharge limits, time-of-use schedules, and grid interaction modes.
2. Monitor Performance: View real-time data on energy generation, consumption, battery status, and grid interaction.
3. Access Cloud Monitoring: Utilise the VRM cloud portal for remote firmware and configuration management, allowing for diagnostics and updates from anywhere.

While the Solarman app provides extensive control, an accredited installer will typically perform the initial setup and grid connection to ensure compliance with local regulations and safety standards.

Essential Safety Procedures

Working with hybrid inverters and battery systems requires strict adherence to safety protocols to prevent injury and equipment damage. Always prioritise safety during installation, maintenance, and troubleshooting.

DC Battery Disconnect Procedure

Before performing any work on the battery or DC side of the inverter, follow this critical safety step:

1. Switch off the DC battery isolator.
2. Wait at least 5 minutes for internal capacitors to discharge. This waiting period is crucial to ensure that any residual energy stored within the inverter's capacitors has safely dissipated, preventing electric shock.

Protective Earthing

Proper earthing is fundamental for electrical safety. You must bond the inverter chassis ground and the battery metal enclosure to the main installation earthing terminal. This provides a safe path for fault currents, protecting against electric shock.

General Safety Advice

• Always use insulated tools when working with electrical components.
• Ensure the work area is dry and well-ventilated.
• Never attempt to open the inverter enclosure or perform internal repairs unless you are a qualified and authorised service technician. Opening the unit is authorised-service work.
• Grid-protection settings are set by an accredited installer and changing them can breach the connection agreement. Do not attempt to alter these settings yourself.

What You Can Check Yourself, and What You Cannot

As a homeowner, you can perform several basic checks and monitoring tasks to ensure your Sofar HYD system is operating correctly. However, certain tasks require the expertise and certification of an accredited installer.

What You Can Check Yourself:

• System Status via Solarman App: Regularly check the Solarman app for real-time performance data, error messages, and overall system health, as commissioning, operating parameters, and cloud monitoring are configured via the Solarman app.
• Visual Inspection: Periodically inspect the inverter and battery for any visible signs of damage, loose connections, or unusual noises.
• Basic Configuration: Adjust operating parameters like time-of-use schedules or preferred operating modes through the Solarman app, as long as these do not interfere with grid-protection settings.
• Firmware Updates: Monitor for remote firmware and configuration management via the VRM cloud portal, which may be initiated by your installer or Sofar Solar.

What You Cannot Do Yourself:

• Electrical Connections: Do not attempt to make or alter any electrical connections, including AC, DC, or communication wiring. This includes connecting the battery BMS communication lead to the dedicated CAN port on the inverter communication board, which should be done by an installer.
• Internal Repairs: Never open the inverter chassis. Internal components carry high voltages and can remain charged even after power is disconnected. Opening the unit is authorised-service work.
• Grid Connection Settings: Do not modify grid-protection settings. These are critical for grid stability and safety, and changing them can breach your connection agreement and local regulations. An accredited installer must handle these settings.
• Earthing Connections: Do not alter or install earthing connections. Bonding the inverter chassis ground and battery metal enclosure to the main installation earthing terminal is a task for a qualified professional.

What the published sources do not tell you

While the provided specifications detail the capabilities and setup procedures for Sofar HYD inverters, they do not provide specific pinout diagrams for all possible battery BMS communication leads. The instruction "Connect the battery BMS communication lead to the dedicated CAN port on the inverter communication board" is clear, but the exact wiring for every modular lithium storage system is not detailed. This information typically comes from the battery manufacturer's specific documentation.

Furthermore, while official scheme guidelines states the inverter "Complies with international microgeneration safety and grid protection standards," it does not list the specific standards or local grid codes that an accredited installer must adhere to in Great Britain. These specific codes can vary by Distribution Network Operator (grid operator) and are essential for a compliant installation. Official scheme guidelines also does not provide specific fault codes or troubleshooting steps beyond general safety procedures.