A power converter including: a first DC-DC converter that is configured to convert a voltage of a DC power output from a power generator that is configured to generate power based on a renewable energy and is configured to output the DC power as converted to a DC bus; and an inverter connected via the DC bus to convert the DC power on the DC bus into an AC power and configured to supply the AC power as converted to a power system; and a control circuit (14, 15) that is configured to control the inverter,wherein: a second DC-DC converter that is configured to control an input and an output of a power storage unit is connectable to the DC bus, the control circuit (14,15) is configured to deactivate a reverse power flow suppression function for suppressing a reverse power flow from the inverter to the power system when the second DC-DC converter is not connected to the DC bus and is configured to activate the reverse power flow suppression function when the second DC-DC converter is connected to the DC bus, and deactivating the reverse power flow suppression function comprises deactivating a code related to reverse power flow suppression in a firmware installed in the control circuit (14, 15), and activating the reverse power flow suppression function comprises activating the code related to reverse power flow suppression in the firmware installed in the control circuit (14, 15). a first DC-DC converter that is configured to convert a voltage of a DC power output from a power generator that is configured to generate power based on a renewable energy and is configured to output the DC power as converted to a DC bus; and an inverter connected via the DC bus to convert the DC power on the DC bus into an AC power and configured to supply the AC power as converted to a power system; and a control circuit (14, 15) that is configured to control the inverter,wherein: a second DC-DC converter that is configured to control an input and an output of a power storage unit is connectable to the DC bus, the control circuit (14,15) is configured to deactivate a reverse power flow suppression function for suppressing a reverse power flow from the inverter to the power system when the second DC-DC converter is not connected to the DC bus and is configured to activate the reverse power flow suppression function when the second DC-DC converter is connected to the DC bus, and deactivating the reverse power flow suppression function comprises deactivating a code related to reverse power flow suppression in a firmware installed in the control circuit (14, 15), and activating the reverse power flow suppression function comprises activating the code related to reverse power flow suppression in the firmware installed in the control circuit (14, 15). a second DC-DC converter that is configured to control an input and an output of a power storage unit is connectable to the DC bus, the control circuit (14,15) is configured to deactivate a reverse power flow suppression function for suppressing a reverse power flow from the inverter to the power system when the second DC-DC converter is not connected to the DC bus and is configured to activate the reverse power flow suppression function when the second DC-DC converter is connected to the DC bus, and deactivating the reverse power flow suppression function comprises deactivating a code related to reverse power flow suppression in a firmware installed in the control circuit (14, 15), and activating the reverse power flow suppression function comprises activating the code related to reverse power flow suppression in the firmware installed in the control circuit (14, 15).