Here's a template of a home Inverter system with a solar system. Battery charged by solar only. No need for Grid power for battery charge. It can be used old UPS circuit. A circuit diagram depicts the current flow channel and how different components of a device are linked. Circuits are classified into two types: serial and parallel circuits. In other words, a serial circuit is formed when the components are attached in series, while a parallel circuit is created when they are connected in parallel. The current has just one path to go in the serial circuit. The current flows in the same direction via each resistor.