NOVELTY - The system (10) has a storage battery (20) arranged on an independent-power-production power supply device (18) via a charging circuit (28). A connection mode connects the battery and a terminal wire (16). The power supply device is connected to a power distribution line (12) via an alternating current output circuit (26). The battery is fixed to the distribution line via another charging circuit (30). A connection switching circuit (22) switches another connection mode to connect the battery and the wire. A switching control circuit (24) controls the connection switching circuit.    USE - Independent-power-production system for use with a renewable energy power supply device e.g. solar power generation device and wind power generator, in a home during night-time.    ADVANTAGE - The switching control circuit controls the connection switching circuit, so that two connection modes are freely selected, and the solar power generation device can be efficiently utilized according to terms and conditions. The alternating current output circuit, the connection switching circuit and the switching control circuit are integrally accommodated in a case, so that a connecting terminal required for connection with an external circuit is provided, and a part of a photovoltaic power generation installation unit can be substituted, thus simplifying installing operation and construction operation of the photovoltaic power generation installation unit. The switching control circuit is controlled by a control signal input from a home energy management system (HEMS) management server, so that the switch connection mode can be carried out at arbitrary timings, different electric power apparatuses under management can be synthetically judged and dynamic switching of the connection modes can be carried out.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an independent-power-production control apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit block diagram of a connection mode of an independent-power-production system.'(Drawing includes non-English language text)'    Independent-power-production system (10)    Power distribution line (12)    Terminal wire (16)    Independent-power-production power supply device (18)    Storage battery (20)    Connection switching circuit (22)    Switching control circuit (24)    Alternating current output circuit (26)    Charging circuits (28, 30)