Smart Main panel is a combination of components that help complete the solar panel installation process. It significantly reduces the cost of solar system installation and increases home value streamlined look and functionality. In the case of the SMP, no extra wires are hanging from the through its walls Smart Main electrical panel (SMP) with extra busbars is for a residential solar panel system load and critical load centre. Jumper divides the main busbar. It separates critical loads from the main load busbar.