Solar energy is practically unlimited and available most place. It is the most environmentally friendly energy source. Standard PV power conversion system have first stage dc-dc converter, either isolated or non-isolated, and the second stage dc-ac inverter for ac output. Isolation between PV cells and ac output is generally required to meet safety requirements in U.S. In Europe and Japan, many inverters are designed with non-isolated topologies, which can be lighter weight, higher efficiency, and lower cost, but they also require ground loop protection circuit to avoid accidental electric shock. For commercial and industrial applications, 3- phase, 10 to 100 kW units is typical, which can be served by APS SiC diodes and MOSFETs solutions.