a string including a plurality of solar cell modules connected in series;

an inverter connected to the string and configured to convert DC power output from the string to AC power;

a first shutoff device including a first switching unit and a second switching unit, the first switching unit connected to an anode side terminal of the string and an anode side terminal of the inverter, the second switching unit connected to a cathode side terminal of the string and a cathode side terminal of the inverter, the first shutoff device configured to turn OFF the first switching unit and the second switching unit in response to a first control signal from the inverter; and

a second shutoff device connected to an electric path connecting a solar cell module group and either another solar cell module or the inverter, the solar cell module group including one or more among the plurality of solar cell modules connected in series in the string, the second shutoff device configured to cut off the solar cell module group and either the another solar cell module or the inverter in response to a second control signal from the first shutoff device;

wherein the second shutoff device includes a third switching unit connected to an electric path connecting an anode side terminal of the solar cell module group and either the another solar cell module or the inverter, and a fourth switching unit connected to an electric path connecting a cathode side terminal of the solar cell module group and either the another solar cell module or the inverter;

wherein the first switching unit and the second switching unit are configured to be turned ON/OFF independently of each other in response to the first control signal from the inverter, and

wherein the third switching unit and the fourth switching unit are configured to be turned ON/OFF independently of each other in response to the second control signal from the first shutoff device.