Abstract: A method of manufacturing a heat sink includes a rib portion forming step of forming a rib portion on a substrate having a flat plate shape in such a manner that a first groove and a second groove are formed on a front surface side of the substrate by plastically deforming the substrate by a press thus forming the rib portion in a region sandwiched between the first groove and the second groove. The method further includes a back surface protruding ridge portion cutting removal step of removing protruding ridge portions formed on a back surface side of the substrate by cutting. The method further includes a fin forming step of forming a plurality of fins by working the rib portion; and a heat sink separating step of obtaining the heat sink by separating a portion within a predetermined range which includes the fins from the substrate.

Abstract: A method of manufacturing a heat sink includes a rib portion forming step of forming a rib portion on a substrate having a flat plate shape in such a manner that a first groove and a second groove are formed on a front surface side of the substrate by plastically deforming the substrate by a press thus forming the rib portion in a region sandwiched between the first groove and the second groove. The method further includes a back surface protruding ridge portion cutting removal step of removing protruding ridge portions formed on a back surface side of the substrate by cutting. The method further includes a fin forming step of forming a plurality of fins by working the rib portion; and a heat sink separating step of obtaining the heat sink by separating a portion within a predetermined range which includes the fins from the substrate.

Abstract: A photovoltaic power generation system includes a photovoltaic power generator including a plurality of PV modules, and a PV inverter that connects an output by the photovoltaic power generator to a power grid. The ratio of a rated output by the photovoltaic power generator defined by a rated output by the PV modules relative to a rated output by the PV inverter is equal to or greater than 140%. The photovoltaic power generation system further includes a battery unit, a battery inverter that connects an output by the battery unit to a power grid, and a controller that adjusts an output by the battery unit in such a way that an output by the battery inverter becomes equal to or greater than a preset electric power together with an output by the PV inverter.