A solar inverter is a device that converts the DC power from solar panels into AC electricity. It usually has multiple DC inputs that allow the connection of solar PV strings into the inverter’s DC side. The AC side of an on-grid type inverter (a.k.a. grid-tie solar inverter) directly connects to the local utility grid through the electrical mains of a building. It uses the electrical utility parameters such as voltage and frequency as a grid reference. http://www.meanwellpowersupply.com/dc-ac-inverter/solar-inverter/