I am installing a 7500 wat grid tie system . I am using used panels . I got everything installed and i am getting positive on the ground wire when grounded to earth ground . I took total voltage and counted back panels to find the bad panel . I then ran a jumper to that panel to be sure it was the bad panel . .When checked the ground moves on to a different panel . I just cant wrap my head around what is going on .Why am i getting positive feeding into the ground that floats ? thanks for your help .