I have a 7200-s with 3X16 DLI, 1 uni card with 2X4 TRM and 1X 4SL2U, 45 DS21 and 1X64 button DSS. I would like to connect battery back up using the Samsung provided cable and 4x 12v batteries. Would anyone know estimated power back-up time? I have sent Tech support an email days ago but no response!!!