Dyness DCB-TW-5U20 Combiner Box Installation and Inverter Commissioning Guide

System Overview

This document outlines the installation and commissioning procedures for the Dyness Tower Combiner Box (DCB-TW-5U20) and its integration with Dyness Battery Discharge Units (BDUs) and compatible inverters. The system is designed for solar energy storage applications.

Overall Configuration Diagram

The system configuration includes a solar system, a hybrid inverter, an electricity panel, and a utility connection. These components are interconnected via a DC breaker and the Dyness Combiner Box (DCB-TW). Multiple Dyness Battery Discharge Units (BDUs), such as the BDU-1.5G, are connected in parallel to the combiner box, forming clusters. The system also features a communication board (COM Board) and a datalogger for system monitoring and control.

Visual representation from page 1 shows a stack of Dyness BDU-1.5G units (BDU-1.5G + Battery module + Base) and the DCB-TW Combiner box, indicating a setup with potentially 5 clusters.

Installation and Wiring

Follow these steps for the physical installation and wiring of the system components.

Power Harness Connection

1. Prepare Power Harness: Crimp one end of the standard 6mm² power harness to the Phoenix waterproof connector terminal. Connect this terminal to the designated socket on the BDU-1.5G unit.
2. Strip Cable End: On the other end of the 6mm² power cable, strip the insulation approximately 15mm from the end.
3. Crimp Tubular Terminal: Crimp the stripped 6mm² wire harness to a suitable tubular terminal using crimping pliers.
4. Connect to Combiner Box (B+ and B- Ports):
   • Locate the B+ and B- ports on the combiner box.
   • Rotate the connector housing outward counterclockwise to remove the protective plugs (4 plugs for B+ and B-).
   • Insert the cable with the crimped tubular terminal into the corresponding waterproof plug.
   • Place the black waterproof plug into the designated port on the combiner box.
   • Turn the connector clockwise until it locks securely.
   • Repeat this process for the negative cable connection to the B- port.
5. Battery End Power Connection: The schematic diagram shows the power line connection at the battery end of the combiner box, indicating where the cables are terminated.

Communication Cable Connection

1. Connect Communication Cable: Connect the communication cable (Ethernet) at the battery end of the combiner box.
2. Prepare and Connect: Similar to the power cable, rotate the connector housing counterclockwise, remove protective plugs (5 plugs), insert the standard Ethernet cable into the waterproof plug, and then connect it to the combiner box port, turning clockwise until locked.

AC Power or 24V Power Supply Connection

Connect either an AC power cord or a 24V power supply to the combiner box. Note: Only one power supply source can be used; simultaneous use of both is prohibited.

1. AC Power Connection: Insert the AC power cord into the designated slot on the combiner box. Connect the wiring harness to the L (Line) and N (Neutral) terminals. Secure the connection by turning clockwise until locked.
2. 24V Power Supply Connection: Insert the 24V power cord into the designated slot. Connect the 24V power cord to the green terminal. Ensure the 24V terminal position is correctly inserted.

Inverter Connection

Connection between Combiner Box and Inverter

The connection between the combiner box and the inverter is established using appropriate cables:

• Cables with a cross-sectional area of 6mm² or less should be crimped onto the terminal.
• Cables larger than 6mm² should be crimped with OT terminals and connected to copper bars.

Parallel System Configuration

DIP Switch Setting for Parallel Towers

When connecting multiple Dyness Tower BDUs in parallel, it is necessary to configure the DIP switch on the newly added Tower BDU. Set the DIP switch (specifically DIP 2) to the OFF state for proper parallel operation.

System Start-up and Shutdown

Start-up Sequence

1. Ensure all power wiring harnesses and communication wiring harnesses are correctly connected and inspected.
2. Push the left air switch of all cluster BDUs to the ON position.
3. Push the DC Breaker in the combiner box from OFF to the ON position.
4. Turn the knob switch of Cluster 1 BDU to the ON position.
5. Press and hold the WAKE button for 8-9 seconds, then release.
6. Perform the same operation (steps 4 and 5) for BDUs of Cluster 2, Cluster 3, Cluster 4, and Cluster 5.
7. After all cluster BDUs are powered on, wait for approximately 10 seconds. The combiner box will then signal all cluster BDUs to close their relays and output voltage externally.

Shutdown Sequence

1. First, disconnect the AC power of the combiner box.
2. After approximately 7-8 seconds, the BDUs will cut off the output voltage.
3. Turn the BDU knob switches of Cluster 1, Cluster 2, Cluster 3, Cluster 4, and Cluster 5 to the OFF position.
4. If the battery system is not intended for use for an extended period, turn the switch located on the left side of the BDU to the OFF position.

Inverter Commissioning via SolisCloud App

This section details the process of commissioning a compatible inverter using the Dyness SolisCloud mobile application.

App Overview and Network Configuration

1. Power On Inverter: Ensure the inverter is powered on.
2. Launch SolisCloud App: Log in to the "SolisCloud" application on your mobile device.
3. Select WiFi Configuration: Navigate to the "WiFi Configuration" option within the app.
4. Connect to Datalogger Network: On your phone's network settings, select the datalogger's WiFi network (e.g., "Solis_7A122C23EE800C56"). Ensure the datalogger's indicator light is stable (red light solid, green light flashing every second). If the WiFi signal is not found, try re-plugging the datalogger.
5. Connect to Router: Connect your phone to your local WiFi router. Note: The system only supports 2.4G band routers; 5G band is not supported.
6. Configuration Complete: Once connected, the app will indicate "Configuration Complete". The datalogger will attempt to connect to the corresponding WiFi source. A stable green indicator light on the datalogger signifies a successful internet connection. If the green light continues to flash after one minute, reset the datalogger.

Local Operation and Device Selection

1. Select Connection Method: After network configuration, choose "Local Operation" in the SolisCloud app. Select your preferred connection method: "Connect With Bluetooth" or "Connect With WiFi".
2. Search and Select Inverter: The app will display nearby devices. Click "Search Device" if your inverter is not listed. Select your inverter from the list (e.g., "INV_060232180029").

Quick Setting - Inverter Parameters

1. Control Verification: In the "Control Verification" screen, enter the owner's name and click "Verify".
2. Quick Setting Menu: Proceed to the "Quick Setting" menu.
3. Date and Time: Set the "Inverter Date Setting", "Inverter Time Setting", and "Phone Time" (or "Follow Phone Time").
4. Battery Model: Select the appropriate "Battery Model" from the provided list (e.g., Dyness HV, PYLON_HV, B_BOX_HV BYD, LG_HV LG, SOLUNA HV, etc.).
5. Grid Code: Select the relevant "Grid Code".
6. Meter Type: Choose the "Meter Type" (e.g., Acrel 1P Meter, Acrel 3P Meter, Eastron Standard 1P Meter, Eastron Standard 3P Meter, NO Meter). Note any applicability for specific meters.
7. Working Mode: Select the desired "Working Mode":
   • Self-Use Mode: Prioritizes self-consumption of solar energy.
   • Feed-in Priority Mode: Prioritizes feeding excess energy back to the grid.
   • Backup Mode: Ensures power supply during grid outages.
   • Off-Grid Mode: Operates independently of the grid.

Self-Use Mode Configuration

Within the "Self-Use Mode" settings:

• Enable the "Self-Use Mode Switch".
• Configure "Time of Use Switch" to enable time-based settings.
• Set the "Time of Use Charge Current" and "Time of Use Discharge Current" (e.g., 50.0A).
• Define "Charge Time Slot" and "Discharge Time Slot" periods for optimized battery usage (e.g., Charge Time Slot 1: 11:00-16:00, Discharge Time Slot 1: 21:00-22:00).
• Optionally enable "Allow Grid Charging".

Off-Grid Mode Configuration

To configure "Off-Grid Mode":

• Navigate to "Work Mode" and select "Off-Grid Mode".
• Enable the "Off-grid Mode Switch".
• Set the "Off-Grid Overdischarge SOC" (State of Charge) percentage (e.g., 10%).

When the inverter is disconnected from the grid, it will automatically enter the off-grid mode, allowing the connected load to be discharged.