Abstract: Between a light receiving glass and a backside glass a plurality of solar battery cells form a matrix of solar battery cells and a translucent, intermediate layer of film is also interposed to configure a photovoltaic module having a light receptive, glass laminate structure, wherein at least one of a back surface of the solar battery cell and a front surface of the backside glass observed indoors has a film stuck thereon. For a photovoltaic module having a light receptive, multi-layer structure, a glass observed indoors also has a film stuck thereon. The solar battery cell can thus have a back surface with a lead frame, a mark of paste applied for collection of electricity covered with the film to provide an improved, externally observed design and an increased product value.

Abstract: A photovoltaic module including: a light-transmissive substrate; a first sealing polymer layer stacked on the substrate; a photovoltaic cell stacked on the first sealing polymer layer; a second sealing polymer layer stacked on the photovoltaic cell and a weatherproof film stacked on the second sealing polymer layer, wherein the weatherproof film includes a moisture-proof layer provided on the second sealing polymer layer and a gas-proof layer provided on the moisture-proof layer, the gas-proof layer being made of polyphenylene sulfide.

Abstract: A photovoltaic module including: a light-transmissive substrate; a first sealing polymer layer stacked on the substrate; a photovoltaic cell stacked on the first sealing polymer layer; a second sealing polymer layer stacked on the photovoltaic cell and a weatherproof film stacked on the second sealing polymer layer, wherein the weatherproof film includes a moisture-proof layer provided on the second sealing polymer layer and a gas-proof layer provided on the moisture-proof layer, the gas-proof layer being made of polyphenylene sulfide.

Abstract: Between a light receiving glass and a backside glass a plurality of solar battery cells form a matrix of solar battery cells and a translucent, intermediate layer of film is also interposed to configure a photovoltaic module having a light receptive, glass laminate structure, wherein at least one of a back surface of the solar battery cell and a front surface of the backside glass observed indoors has a film stuck thereon. For a photovoltaic module having a light receptive, multi-layer structure, a glass observed indoors also has a film stuck thereon. The solar battery cell can thus have a back surface with a lead frame, a mark of paste applied for collection of electricity covered with the film to provide an improved, externally observed design and an increased product value.

Abstract: A charging and discharge control circuit includes a charging control for detecting a voltage across a storage battery connected with a source of electromotive force and for outputting a first switching signal for a charging circuit of the storage battery, and a discharge control for integrating the amount of voltage discharged from the storage battery and for outputting a second switching signal for a discharge circuit. The second switching signal corresponds to the amount of voltage remaining in the storage battery. The integrated value of the amount of the voltage discharged is reset by an output signal from the charging control which is outputted at the time of completion of the charging of the storage battery.