Abstract: Provided is a power conversion apparatus including: an isolated converter that is connected to the first converter, the second converter, and the rechargeable battery, and that is configured to bidirectionally convert voltage of direct-current power supplied from a connection destination; and a control unit that is configured to cause the isolated converter to vary voltage at a direct-current input-output terminal of the first converter in accordance with power generated by a photovoltaic power generator, the direct-current input-output terminal being connected to the isolated converter, wherein the first converter is configured to convert alternating-current power supplied from a grid power line to direct-current power, the second converter is configured to convert voltage of direct-current power supplied from the photovoltaic power generator, and to supply the voltage-converted direct-current power to the direct-current input-output terminal of the first converter.

Abstract: A hot water supply device includes a heater, a water channel, a mixing valve unit, and a circulation mechanism. The mixing valve unit has a valve member and a drive unit configured to drive the valve member to change a mixing ratio of supply water heated by the heater and unheated water. The circulation mechanism has: a connection passage that connects the water channel to the heater by being branched from a part of the water channel between the mixing valve unit and the heater; an on-off valve that opens and closes the connection passage; and a pump configured to return the supply water remaining in the water channel through the connection passage to the heater. A drive amount acquisition unit acquires a drive amount of the drive unit, and a controller controls the circulation mechanism based on the drive amount acquired by the drive amount acquisition unit.

Abstract: A hot water supply device includes a heater, a water channel, a mixing valve unit, and a circulation mechanism. The mixing valve unit has a valve member and a drive unit configured to drive the valve member to change a mixing ratio of supply water heated by the heater and unheated water. The circulation mechanism has: a connection passage that connects the water channel to the heater by being branched from a part of the water channel between the mixing valve unit and the heater; an on-off valve that opens and closes the connection passage; and a pump configured to return the supply water remaining in the water channel through the connection passage to the heater. A drive amount acquisition unit acquires a drive amount of the drive unit, and a controller controls the circulation mechanism based on the drive amount acquired by the drive amount acquisition unit.