A Solar Array Junction Box has cables that carry the electricity from the solar panel to it. It is used to connect the photovoltaic strings in parallel. The combined DC power is fed to the photovoltaic inverter. It includes photovoltaic string protection, overvoltage protection and a DC output switch isolator. It is an enclosure placed at the underside of the solar PV module (solar backsheet). The Solar Array Junction Box is very effective and useful.