What Is the Core Function of The DC-DC Module in Residential Energy Storage Systems? I. Core Functions of a DC-DC Module 1. Matching the DC Input Voltage Requirements of the Power Conversion System (PCS) The PCS is the core power conversion unit in residential energy storage systems. Its DC input typically operates within a fixed voltage range, such as 300–800V or 600–900V. A 51.2V low-voltage bat...