Photovoltaic power generation system connects with public grid to operate at the same rate, which requires power grid inverter connected with the same functional public grid. Grid-type photovoltaic power generation system eliminated the advantages of batteries. And this system maintained the public grid as energy storage unit. Battery life period is usually only 5 to 8 years with environmental pollution made by scrapped batteries. The loss of energy happens all the time through the using. So the photovoltaic power generation system without batteries will reduce the cost significantly and also have higher power generation efficiency & better environmental performance.