Dyness Battery Pairing Settings for Growatt, Solis, Deye, and Inverex Inverters

Key Takeaways

• Proper BMS communication is essential for safe and efficient operation of Dyness lithium batteries with compatible inverters.
• For Growatt and Deye, you will select a "Lithium" battery type and configure communication protocols (RS485/CAN).
• Solis inverters offer a direct "Dyness" selection in their battery menu for integrated control.
• Inverex (Axpert VM III) inverters require "User-Defined" settings for voltages, as they do not offer specific Dyness profiles.
• Always ensure the inverter's power is off and safety precautions are followed before making any wiring or setting changes.

Why are correct Dyness battery pairing settings important?

Correctly configuring your inverter for Dyness lithium batteries ensures optimal performance, longevity, and safety of your solar energy system. Lithium batteries, especially those with an integrated Battery Management System (BMS), rely on precise communication with the inverter to manage charging, discharging, and overall health. Incorrect settings can lead to inefficient charging, premature battery degradation, or even safety hazards.

How to configure your inverter for Dyness batteries

The process for pairing Dyness batteries varies depending on your inverter brand and model. For inverters that support direct BMS communication, many critical settings like charge voltage and current are automatically managed by the battery's BMS. For inverters requiring user-defined settings, you will need to manually input voltage parameters.

Diagnosis Steps:

1. Identify your inverter model: Confirm the exact model of your Growatt, Solis, Deye, or Inverex inverter. This ensures you refer to the correct manual and settings.
2. Check for BMS communication capability: Determine if your inverter supports communication with an external battery's BMS. Most modern inverters designed for lithium batteries will have RS485 or CAN communication ports.
3. Locate battery settings menu: Access your inverter's display panel or monitoring software to find the battery type and communication settings.
4. Refer to the pairing table: Use the table below to find the specific settings recommended for your inverter and Dyness battery.
5. Verify communication: After applying settings, monitor your system to ensure the inverter is correctly communicating with the Dyness battery. Look for battery status indicators on the inverter display or monitoring app.

Dyness Battery Pairing Settings Table

This table provides the essential settings for pairing Dyness lithium batteries with common inverter brands in Pakistan. Where an inverter communicates directly with the battery's BMS, specific voltage settings are often managed automatically by the BMS.

Understanding Communication Protocols

Lithium batteries with a Battery Management System (BMS) often communicate with inverters using specific protocols to share vital information such as State of Charge (SOC), voltage, current, and temperature. This closed-loop communication allows the inverter to optimize charging and discharging based on real-time battery data.

• CAN-BUS (Controller Area Network): A robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in applications without a host computer. It is commonly used for high-speed, reliable communication between inverters and lithium battery BMS.
• RS485: A standard defining the electrical characteristics of drivers and receivers for use in serial communications systems. It is also widely used for communication between inverters and battery systems, often for longer distances or in noisy environments.

For Growatt SPF 3500 ES / SPF 5000 ES inverters, Program 36 allows you to select a communication protocol. The manual states, "You can choose RS485 communication protocol which is from L01 to L50, and you can also choose CAN communication protocol which is from L51 to L99." However, it explicitly advises, "Please get instruction from Growatt to choose which protocol to match the BMS." This indicates that specific protocol numbers for Dyness batteries are not universally published in the inverter manual and may require direct consultation with Growatt or Dyness.

Similarly, Deye SUN-5K-SG03LP1-EU / SUN-6K-SG03LP1-EU inverters designate a "BMS 485 Port" for RS485 and a "BMS CAN Port" for CAN communication. The "Lithium Mode (Battery Setting)" should be set to "BMS protocol," with the manual advising to "reference the document(Approved Battery)" for specific protocols.

For Solis S5-EH1P-L Series inverters, selecting "Dyness" in the "Battery Select" menu typically initiates the necessary BMS communication without requiring manual protocol selection. When an inverter communicates directly with the battery's BMS, many voltage and current settings are typically managed by the BMS in a closed-loop system, and thus are not user-configurable or explicitly stated in the inverter manual.

Inverex (Axpert VM III) inverters, while offering "CAN and RS232 or RS485" communication ports for BMS, also provide a "User-Defined" option for Battery Type (Program 05). If "User-Defined" is selected, battery charge voltage and low DC cut-off voltage can be set up in program 26, 27 and 29. This means you would manually set the bulk, floating, and low DC cut-off voltages based on Dyness specifications, rather than relying on an automatic profile. For the 5KW model, the increment of each click is 0.1V for these voltage settings.

Safety Considerations for Lithium Battery Systems

Working with solar inverters and lithium batteries involves high voltages and currents. Always prioritize safety to prevent injury or damage to equipment.

• Qualified Personnel: "All wiring must be performed by a qualified personnel."
• Appropriate Cabling: "It's very important for system safety and efficient operation to use appropriate cable for battery connection."
• High Voltage Awareness: "Installation must be performed with care due to high battery voltage in series."
• BMS Communication Cable: "If choosing lithium battery, make sure to connect the BMS communication cable between the battery and the inverter." This cable is crucial for the inverter and battery to safely manage charge and discharge parameters.
• Power Isolation: Before making any connections or changing settings, ensure all power sources (PV, battery, AC grid) are isolated. Turn off all breakers and switches.
• Insulated Tools: Use insulated tools when working with battery terminals to prevent accidental short circuits. A spanner across a battery bank can short hundreds of amps, causing severe burns and equipment damage.
• BMS Control: Be aware that "When the battery type set as “LI”, the Maximum charge current can't be modified by the user. When the communication fail, the inverter will cut off output." This highlights the critical role of the BMS in managing lithium battery safety.

When to call a technician instead

While many settings can be adjusted by the user, there are situations where professional assistance is necessary:

• Uncertainty with Settings: If you are unsure about any setting or parameter, especially regarding communication protocols or user-defined voltages, consult a qualified solar technician. Incorrect settings can damage your battery or inverter.
• Persistent Communication Errors: If your inverter fails to establish or maintain communication with the Dyness battery despite correct settings and cabling, a technician can diagnose underlying issues.
• Complex System Integration: For systems involving multiple batteries, parallel inverters, or advanced monitoring setups, professional installation and configuration are recommended.
• Warranty Concerns: Attempting unauthorized repairs or modifications to your inverter or battery may void your warranty. Always refer to the manufacturer's warranty terms.
• Physical Damage: If there is any physical damage to the inverter, battery, or communication cables, do not attempt to fix it yourself.
• High Voltage Work: Any work involving high DC voltages from the battery bank or PV array should only be performed by trained and certified personnel.