How much current can be forced through a photovoltaic (solar) cell before its performance starts to deteriorate? In certain accelerated lifetime testing 1.25xIsc is forced through a solar module while it sits inside a chamber (no incident light). Is there a theoretical limit to the amount of forward bias current pushed through this module? At some current, the module might get hot to cause deterioration of materials surrounding the solar cells. But once the current is turned off, will the solar module perform as it did before this test was started? Will there be a thermal runaway if the test is carried on for multiple hours?