AC/DC Cable Selection for Energy Storage & PV Systems

This document provides comprehensive guidelines for selecting AC and DC power cables in energy storage and photovoltaic systems. For AC side cables, key factors include rated voltage, ampacity, insulation materials (e.g., XLPE with 105-125°C rating), flame retardancy (self-extinguishing within 5 seconds), and proper installation to avoid overheating. Cable types such as PVC, XLPE, and rubber insulated cables are compared. For PV DC cables, selection is based on module current and voltage drop (recommended ≤2%). Using PV-specific cables with UV and ozone resistance ensures 25-year outdoor life. Examples show 4mm² and 6mm² cables with resistance values and maximum distances. AC inverter cables are chosen by maximum current, with types like BVR and YJV, noting voltage and temperature ratings. The document also covers general power cable selection principles: economic, reliability, applicability, and environmental aspects. Detailed guidance is given on rated voltage (UN ≥ USN), core number selection for low and medium voltage (e.g., 3+2 core for three-phase five-wire), conductor materials (copper vs. aluminum), insulation types (PVC, XLPE, rubber) based on temperature and environment, and sheath types including armored and non-armored options for direct burial or air installation. Special considerations for fire-resistant, low-toxic, and radiation-resistant cables are included.