This diagram helps engineers and enthusiasts understand the design and functionality of a solar charging system, and can also be used as a guide for building and troubleshooting such circuits. . Simple solar charger circuits are small devices which allow you to charge a battery quickly and cheaply, through solar panels. Layman friendly, and easy to build. Must be efficient enough to satisfy the. . In the previous post we have seen the circuit diagram of 9v battery charger circuit using LM311 and SCR. Solar concept is not new for us. Take a simple stranded copper core wire. This diagram outlines the necessary connections between the panels, batteries, and other components to ensure a properly functioning system.