A photovoltaic module comprising: a solar cell module including a plurality of solar cells; and a junction box attached to rear surface of the solar cell module, and including a bypass diode unit comprising a plurality of bypass diodes (Da, Db, Dc), a capacitor unit to store DC power supplied from the solar cell module and a dc/dc converter unit to convert the level of the stored DC power and output the same, wherein the plurality of solar cells are electrically connected to a plurality of conductive lines (135a, 135b, 135c, 135d), respectively, and the conductive lines (135a, 135b, 135c, 135d) are extended to the rear surface of the solar cell module through first openings formed in the solar cell module, and are connected to the plurality of bypass diodes (Da, Db, Dc), respectively, through second openings formed on the junction box, wherein the junction box further comprises: an overcurrent preventing unit to limit a current based on a DC current supplied from the solar cell module; a controller to control the overcurrent preventing unit and to provide control to stop supplying of the DC power when a voltage (V c1) at both ends of the capacitor unit is higher than an allowable value, wherein the junction box is disposed to be closer to an end portion, to which the plurality of conductive lines (135a, 135b, 135c, 135d) extend, among both end portions of the solar cell module. a solar cell module including a plurality of solar cells; and a junction box attached to rear surface of the solar cell module, and including a bypass diode unit comprising a plurality of bypass diodes (Da, Db, Dc), a capacitor unit to store DC power supplied from the solar cell module and a dc/dc converter unit to convert the level of the stored DC power and output the same, wherein the plurality of solar cells are electrically connected to a plurality of conductive lines (135a, 135b, 135c, 135d), respectively, and the conductive lines (135a, 135b, 135c, 135d) are extended to the rear surface of the solar cell module through first openings formed in the solar cell module, and are connected to the plurality of bypass diodes (Da, Db, Dc), respectively, through second openings formed on the junction box, wherein the junction box further comprises: an overcurrent preventing unit to limit a current based on a DC current supplied from the solar cell module; a controller to control the overcurrent preventing unit and to provide control to stop supplying of the DC power when a voltage (V c1) at both ends of the capacitor unit is higher than an allowable value, wherein the junction box is disposed to be closer to an end portion, to which the plurality of conductive lines (135a, 135b, 135c, 135d) extend, among both end portions of the solar cell module. an overcurrent preventing unit to limit a current based on a DC current supplied from the solar cell module; a controller to control the overcurrent preventing unit and to provide control to stop supplying of the DC power when a voltage (V c1) at both ends of the capacitor unit is higher than an allowable value, wherein the junction box is disposed to be closer to an end portion, to which the plurality of conductive lines (135a, 135b, 135c, 135d) extend, among both end portions of the solar cell module.