By 'greyed out', do you mean no data is displayed in the CC window? I just added a 3rd Schneider charge controller for a 3rd array, and I got info showing in the data window on the CC by connecting the unit to my battery bank and adding the unit to the Schneider network via their comms cable. I have an older Schneider XW6048, so this info is based on experience with a complete Schneider set up. Even before I had connected the new array I had system info on that screen, as well as the SCP. And you can easily program your 2nd CC from the SCP by using the copy feature to duplicate settings that you have on your CC #1. If you don't have an SCP (system control panel), you'll have to read their manual - I think the info you'll need is in there. Good luck!