Patent ID: 8723547
Filing Date: 2014-05-13
Classification: H02S,Y02E

Abstract:
1. A solar photovoltaic junction box for being electrically connected to a solar cell array comprising a plurality of solar cell strings each comprising a plurality of solar cell panels series-connected so as to collect and output power generated by each of the solar cell strings, comprising: a plurality of input branch lines electrically connected to the solar cell strings; an output aggregate line that converges the plurality of branch lines to collect power inputted from each of the solar cell strings through the plurality of branch lines and to output the power; a back-flow preventing diode provided on each of the branch lines to block a current flowing from the aggregate line toward the solar cell string; a capacitor parallel connected to each of the back-flow preventing diodes; an AC voltage generator provided on the aggregate line to allow an AC voltage to be applied to the solar cell array through the aggregate line, the branch lines and the capacitor; a measuring means for measuring an alternating current flowing in the solar cell array; and a control unit comprising an malfunction determination portion for determining a malfunction in the solar cell array on the basis of the AC voltage applied by the AC voltage generator and the alternating current measured by the measuring means.