# Appendix ## A.1 Installation and Configuration of Lithium-ion Battery with Modbus Communications The Micro Modular RMC controller can be configured to read data from a battery monitoring system (BMS) used on a lithium-ion battery bank. The BMS data is used for presentation and high precision control of the battery charge cycles. All communication to external BMS systems is handled via an RS485 connector, connected to the C7:1 (Data A) and C7:2 (Data B) ports on the RMC front and the corresponding connectors on the battery. The utilized protocol is Modbus-RTU and all data signals and alarms are pre-defined from a Modbus register provided by the battery manufacturer. The following steps describe the configuration of one of the supported lithium-ion batteries. Note that the settings differ between different battery manufacturers. ### **A.1.1 Battery Installation** 1. Follow the manufacturer's installation guide to install the batteries and connect them to the Micro Modular 0 V and -48 V bus bars. 2. Connect the battery RS485 (Data A) output wire to the RMC RS485 connector, C7:1 (Data A) (see figure A.1). 3. Connect the battery RS485 (Data B) output wire to the RMC RS485 connector, C7:2 (Data B) (see figure A.1). 4. It is important to assign a unique Slave-ID to each Li-ion Battery Monitoring Unit (BMU). Note that Slave-ID '1' must be assigned to the BMU with RS485 communication cable connected (the 'main' BMU) and continue in ascending order with the following BMU(s). How to set the Slave-IDs is specified in the manufacturer's manual. In some cases, this is performed automatically by the external BMS.

Figure A.1. The RMC front I/O ports with RS485 connections ports highlighted

### **A.1.2 Micro Modular Configurations** All settings are configured from the local web interface (Rune) under Settings/Modbus Master. You may find detailed descriptions of the relevant parameters here. To complete the Micro Modular configuration for Li-ion battery communication, follow these steps: 1. Login to the site with the user: Admin. The password is provided by Clear Blue Technologies. 2. Open the Settings page and select the Battery tab. 3. Select a battery profile for the installed Li-ion battery and confirm changes 4. Enable communication to Li-ion BMS by selecting the 'True' setting for config "BMU Communication Enabled" under section Lihium-Ion BMS. 5. Set the number of installed Li-ion modules, max number of modules is 16. The Micro Modular system requires that the first module (BMU) is assigned slave-ID '1'. 6. Go to Setting > Modbus Master and confirm that the Modbus communication protocol is correct for the installed battery. 7. Set the RS485 Baudrate according to the manufacturer's manual. 8. To check the communication, open the Battery page and check the BMU status under the Battery menu tab. ## A.2 System Update The Micro Modular system includes and supports between 4 and 19 individual controllers which all can be updated with new firmware if needed. All updates are initiated by manual execution via the local web interface or remotely via Illumience. ### **A.2.1 Update Main Controller** The main controller is based on the Linux operating system. Before you update the system, always make a backup of the configuration files, see section Backup Data. 1. Make sure you have a new firmware file (.enc) located on your PC. 2. Login to the local web interface as Admin. The password is provided by Clear Blue Technologies. 3. Press the System menu and then the 'Software Update' tab (see figure A.4).

Figure A.4. Software Update tab on Rune

5. On the update page, press the 'Choose File' button, choose the update file from your PC and then 'Upload file'. Follow the instructions from the page. 6. The update can take up to 5 minutes to process. 7. After update, login again and check that the new version is presented in the About page. ## **A.3 Delivery Mode** When the RMC is powered on for the first time, the system will enter a 'Delivery mode' where the following default options are set: * Input Source A is set to Grid * Input Source B is disabled * Built-in Solar converters are disabled * Tenant monitoring are disabled --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://esitedocs.clearbluetechnologies.com/micro-operations-manual-14.16/service-and-troubleshooting/appendix.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.