This is a service guideline and checklist for BYD Battery-Box LV Flex
This document provides step-by-step guidance for installing, troubleshooting, and maintaining the BYD Battery-Box LV Flex. It includes sections on general steps, error analysis, measurement procedures, and service tasks such as BMU and LV Flex module replacement. The manual emphasizes the need for qualified electricians and references the latest firmware and app configurations for proper operation.
The guide covers communication setup, grounding, DC connections, and system restart procedures. It also details error handling for BMU and module failures, including voltage checks, cable replacement, and module exclusion methods. Firmware updates and app configurations are explained with specific steps and troubleshooting tips for common issues.
Ensure correct external cabling, proper grounding, Ethernet cable for internet, correct DC port connections, and parallel cabling if applicable. Use CAT5 or higher cables and check conductor cross-section and maximum cable length.
Check the correct data cable port ("BMS" port), try replacing the communication cable, measure battery voltage (should be around 50V), or try another BMU if available.