Battery systems operate at high DC voltages, which can be lethal. Only qualified electricians should perform troubleshooting or repairs. Before working on any part of the system, disconnect both the AC and DC power sources. Follow all safety precautions outlined in the manufacturer's documentation. Be aware of potential arc flash hazards when working with high-voltage DC circuits. Wear appropriate personal protective equipment (PPE), including safety glasses and insulated gloves. Ensure the battery system is installed and maintained according to NEC Article 706 and local electrical codes.