A typical solar photovoltaic power generation system consists of solar arrays (modules), cables, power electronic converters (inverters), energy storage devices (cells), loads that are users, etc. The AES Lawai Solar Project in Kauai, Hawaii has a 100 megawatt-hour battery energy storage system paired with a solar photovoltaic system. Sometimes two is better than one. The reason: Solar energy is not always produced at the time. This article explains how photovoltaics (PV) and energy storage work together, their applications across industries, and why this combination is reshaping renewable energy solutions. Solar panels, also called PV panels, are combined into arrays in a PV system. PV systems can also be installed in grid-connected or off-grid (stand-alone) configurations.