Deye Hybrid Inverter Battery Compatibility and Settings Guide

Key Takeaways

• Always match your Deye inverter's battery settings to your specific battery chemistry and manufacturer recommendations.
• For lithium batteries, use the 'Lithium' mode to enable BMS communication, which dictates charge/discharge parameters.
• Lead-acid batteries require manual voltage settings for Float, Absorption, and Equalization, along with temperature compensation, with setpoints referenced to 25 degC.
• Equalization for lead-acid batteries deliberately drives the cell into the gassing region; ensure adequate ventilation and safety precautions.
• Correct communication cable wiring (RS485 or CAN) and pinouts are critical for smart battery systems.
• Incorrect settings can damage your batteries or inverter; consult the manual and a qualified technician if unsure.

How do I configure Deye hybrid inverters for battery compatibility?

Configuring your Deye hybrid inverter for battery compatibility involves selecting the correct battery type and setting appropriate charge and discharge parameters. For lithium batteries, this primarily means enabling BMS communication. For lead-acid batteries, you will manually input voltage setpoints.

Verifying Current Battery Settings

Before making any changes, it is important to understand your current Deye inverter battery settings. This helps you identify if the issue is a misconfiguration or another problem.

1. Access the LCD Display: Navigate through the inverter's LCD menu to the battery settings section. The exact path may vary slightly by model, but typically involves a "Battery" or "Settings" menu.
2. Identify Battery Mode: Check the "Batt Mode" setting. This will indicate if the inverter is configured for "Lithium," "Use Batt V," "Use Batt %," or "No Batt."
3. Note Key Parameters: Record the current values for "Batt Capacity," "Max A Charge," "Max A Discharge," and any specific voltage or SOC thresholds.
4. Check Communication Status: If using a smart lithium battery, look for any BMS communication status indicators or error codes like F58, which indicates a BMS communication fault. Refer to our guide on /pk/guides/fixes/troubleshooting-battery-communication-errors-in-solar-inverters for more details.

Battery Settings Overview

The following table outlines common battery settings for Deye hybrid inverters, covering both lithium and lead-acid battery types. These settings are applicable to models like the SUN-3.6K-SG03LP1-EU, SUN-5K-SG03LP1-EU, SUN-6K-SG03LP1-EU, SUN-7.6K-SG01LP1-EU, SUN-8K-SG01LP1-EU, SUN-3K-SG04LP1-EU-SM1, SUN-3.6K-SG04LP1-EU-SM2, SUN-5K-SG04LP1-EU-SM2, SUN-6K-SG04LP1-EU-SM2, and SUN-3K-SG04LP1-24-EU-SM1.

Lithium Battery Specifics

When using lithium batteries, the Deye inverter relies heavily on the battery's Battery Management System (BMS) for optimal operation.

1. Select 'Lithium' Mode: On the inverter's LCD, navigate to the "Batt Mode" setting and select "Lithium". This tells the inverter to communicate with the battery's BMS.
2. Lithium Mode (BMS Protocol): For the "Lithium Mode" setting, you may need to select a specific BMS protocol code. This information is typically found in the battery manufacturer's documentation or Deye's "Approved Battery" document.
3. SOC Thresholds: You can set State of Charge (SOC) thresholds for inverter behavior:

• • Shutdown: The inverter will shut down if the SOC falls below this value (e.g., 10%) in off-grid mode.
  • Low Batt: The inverter will trigger an alarm if the SOC drops below this value (e.g., 20%) in on-grid mode.
  • Restart: The inverter's AC output will resume when the battery SOC reaches this value (e.g., 40%) after a low-SOC shutdown.

4. Charge/Discharge Current: The "Max A Charge" and "Max A Discharge" settings will be managed by the battery's BMS, within the limits of the Deye inverter's capabilities. For example, a SUN-5K-SG03LP1-EU inverter has a maximum charge/discharge current of 115A, while a SUN-3.6K-SG03LP1-EU has a maximum of 90A. These examples are specific to the mentioned SG03LP1 models only. Always consult your specific inverter's manual or the MODELS TABLE in the manufacturer's manual for accurate maximum current ratings for your model. Always ensure your battery's BMS can handle the inverter's maximum current.
5. Pylontech US-series Example: For Pylontech US3000C and US5000 batteries, the recommended charge voltage is 52.5 ~ 53.5V. This is typically handled automatically when the inverter is in 'Lithium' mode and communicating with the Pylontech BMS. WARNING: These values are specific to Pylontech batteries and should not be manually applied to other battery types. Furthermore, do not manually apply these voltages to Pylontech batteries if not in BMS-controlled 'Lithium' mode, unless explicitly instructed by the battery manufacturer. A manual voltage entered for one battery family must never be applied to another.

Lead-Acid Battery Specifics

For lead-acid batteries, manual configuration of voltage setpoints is necessary.

1. Select 'Use Batt V' or 'Use Batt %' Mode: Choose the appropriate mode based on whether you want to manage by voltage or state of charge.
2. Voltage Settings (for 48V systems at 25 degC):

• • Float V: Set the float charge voltage (e.g., 53.6V for a 48V system at 25 degC).
  • Absorption V: Set the absorption charge voltage (e.g., 57.6V for a 48V system at 25 degC).
  • Equalization V: Set the equalization charge voltage (e.g., 57.6V for a 48V system at 25 degC).

3. SOC/Voltage Thresholds:

• • Shutdown: The inverter will shut down if the SOC falls below this value (e.g., 20%) in off-grid mode.
  • Low Batt: The inverter will trigger an alarm if the SOC drops below this value (e.g., 35%) in on-grid mode.
  • Restart: The inverter's AC output will resume when the battery SOC reaches this value (e.g., 50%) after a low-SOC shutdown.

4. Temperature Compensation (TEMPCO): Lead-acid battery charge voltages are temperature-sensitive. Set the temperature compensation value (e.g., -5 mV/C/Cell). This value adjusts the charge voltage based on battery temperature, typically referenced to 25 degC.
5. Equalization: If your lead-acid batteries require equalization, configure "Equalization Days" (e.g., 30 days) and "Equalization Hours" (e.g., 3.0 hours). Equalization deliberately drives the cell into the hydrogen gassing region. Ensure the battery bank is in a well-ventilated space with no sparks or flames during this process. Be very cautious when working with metal tools on or around batteries, as dropping a tool may cause a spark or short circuit, potentially leading to an explosion. Wear eye protection when working near batteries, especially during equalization or when handling electrolyte.

Communication Protocols and Cabling

Proper communication between the Deye inverter and a smart battery's BMS is essential for safe and efficient operation.

• BMS Ports: Deye inverters feature dedicated ports for battery communication. SG03LP1 and SG01LP1 models have "BMS 485" (RS485) and "BMS CAN" (CAN) ports. SG04LP1 models have a combined "RS485/CAN" port.
• Pinouts: Correct cable wiring is critical.
• • SG03LP1 BMS 485 Pinout: Pin 1: RS485B, Pin 2: RS485A, Pin 3: GND, Pin 6: GND, Pin 7: RS485A, Pin 8: RS485B.
  • SG03LP1 BMS CAN Pinout: Pin 2: GND, Pin 4: CANH, Pin 5: CANL.
  • SG04LP1 RS485/CAN Pinout: Pin 2: RS485A, Pin 4: GND, Pin 5: CANH, Pin 6: CANL, Pin 7: RS485A, Pin 8: RS485B.
• BMS_Err_Stop: This setting, when active, will cause the inverter to stop and report an F58 error if BMS communication fails. You can disable this on the LCD if you prefer the inverter to continue operating without BMS data, though this is not recommended for smart batteries.
• For more detailed troubleshooting on communication issues, refer to our guide on /pk/guides/fixes/troubleshooting-battery-communication-errors-in-solar-inverters.

Monitoring and Data Logging

Deye inverters can be connected to monitoring systems to track battery performance and settings.

• WiFi Interface: Deye inverters (SG03LP1, SG01LP1, SG04LP1) have a dedicated WiFi Interface port. An optional WiFi Plug accessory is used for configuration.
• Datalogger: An optional datalogger can be connected via the RS232 port. The RS232 port pinout is Pin 1: D-GND, Pin 5: TX, Pin 6: RX, Pin 7: 12Vdc. Some SG01LP1 and SG04LP1 models may have DB9 or USB logger interfaces.
• For setup guidance, see our article on /pk/guides/fixes/deye-wifi-solarman-logger-setup.

Safety: Battery Handling and Electrical Risks

Working with batteries and inverters involves significant electrical hazards. Always prioritize safety.

• Electrical Shock Risk: Disconnect all wires before attempting any maintenance or cleaning. Turning off the unit alone does not eliminate this risk.
• Battery Handling: Be cautious with metal tools around batteries. Dropping a tool can cause a spark or short circuit, potentially leading to an explosion.
• Wiring Disconnection: Strictly follow the installation procedure when disconnecting AC or DC terminals. Ensure positive(+) connects to positive(+) and negative(-) to negative(-). Reverse polarity will damage the inverter.
• Grounding: The inverter must be connected to a permanent grounded wiring system in compliance with local requirements.
• Equalization (Lead-Acid): Equalization charges produce hydrogen gas. Ensure the battery area is well-ventilated and free from ignition sources. Wear eye protection when working near batteries, especially during equalization or when handling electrolyte.
• PV Current Leakage: To avoid any malfunction, do not connect any PV modules with possible current leakage to the inverter. For example, grounded PV modules will cause current leakage to the inverter. When using PV modules, please ensure the PV+ & PV- of solar panel is not connected to the system ground bar.
• PV Surge Protection: It is requested to use PV junction box with surge protection. Otherwise, it will cause damage on inverter when lightning occurs on PV modules.

When to call a technician instead

While many settings can be adjusted by the user, some situations require professional intervention.

• If you are unsure about any setting, especially those related to voltage or current limits, contact a qualified solar technician. Incorrect settings can void your warranty or damage your equipment.
• If the inverter displays persistent fault codes after basic troubleshooting (e.g., F58 for BMS communication fault, or any other fault code not resolved by simple restarts), contact your local dealer or service center. Provide them with the inverter serial number, distributor information, and a detailed description of the problem, including any fault codes and indicator statuses. You can find more information on common fault codes in our /pk/guides/fixes/solar-inverter-fault-codes-explained article.
• Any wiring modifications, especially to the AC or DC power connections, should be performed by a professional.