To solve such a problem that installation of a relay for interconnection in an inverter of an AC module becomes the cause enlarging the inverter, and it is difficult for the user to confirm a cut-off condition of the AC module with the system when abnormality occurs.

Output of the inverter 3 is supplied to the system or the load, via an adopter 41 by connecting a plug 42 to an outlet. The inverter 3 outputs a signal to separate the plug 42 and the adopter 41, when outflow of DC component, ground fault of a solar cell, or the like, a fault or abnormality of the power conversion means, or detecting abnormality of the system.